JPH07317637A - Ignition control method for multi-cylinder internal combustion engine - Google Patents

Abstract

PURPOSE:To attain a reliable start by feeding an ignition signal to ignition circuits for a specific cylinder when the signal is generated by a signal generator at a specific rotation angle position at the time of a start of an engine, and igniting other cylinders after the rotation is somewhat stabilized. CONSTITUTION:The engine rotating speed is detected by a CPU 16 from the output signal of a signal generator l rotated synchronously with an internal combustion engine, and ignition positions of cylinders are determined. The time required for the engine to rotate to the ignition position of each cylinder is calculated as the ignition position measuring time for each cylinder, and an ignition signal is generated. The specific position where the signal generator 1 generates the signal is made equal to the ignition position at the time of a start of the specific cylinder. The ignition signal is fed to only the ignition circuits U1-Un for the specific cylinder when the signal generator 1 generates the signal at the specific position until the rotating speed of the engine reaches a set value after the start of the engine, and the ignition signal is fed to the ignition circuits for the other cylinders after the rotating speed exceeds the set value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine ignition control method for controlling ignition of a multi-cylinder internal combustion engine.

[0002]

2. Description of the Related Art A so-called predictive time control system is known as a system for controlling ignition of a multi-cylinder internal combustion engine using a microcomputer. In this system, an ignition circuit that applies a high voltage to the ignition plug of each cylinder when an ignition signal is given is provided for each cylinder, and the ignition position of each cylinder (for each cylinder) is set for each rotation speed of the engine. The rotational angle position of the engine for performing the ignition is calculated and the ignition signal is given to the ignition circuit for each cylinder when the calculated ignition position of each cylinder is detected.

To enable detection of the ignition position, a specific rotation angle of the internal combustion engine is set as a reference position, and the time required for the engine to rotate from the reference position to the ignition position of each cylinder at each rotation speed is set to each rotation. As the ignition position measurement time of each cylinder at the speed, this ignition position measurement time is calculated every time the rotation speed of the engine is detected. Then, a reference signal is generated at the reference position, the measurement of the ignition position measurement time for each cylinder is started when the reference signal is generated, and each is measured when the measurement of the ignition position measurement time for each cylinder is completed. An ignition signal is supplied to the ignition circuit for the cylinder.

A signal generator is attached to the engine in order to obtain the rotation angle information and the rotation speed information of the reference position of the engine.
The signal generator 1 is, for example, as shown in FIG. 7, a rotor 3 that is attached to a rotating shaft (usually a crankshaft) 2 of the engine and rotates synchronously with the engine, and an attachment provided in a fixed portion such as a case of the engine. And a signal emitting electron 4 attached to the section. The rotor 3 includes a rotating body 3a made of a ferromagnetic material and having an outer peripheral surface formed into a cylindrical surface.
Around the outer periphery of a, there is provided a reluctor 3b consisting of an arcuate projection having a constant polar arc angle α. Signal generator 4
Is an iron core 4a having a magnetic pole portion 4a1 facing the rotor 3 at its tip, a permanent magnet 4b having one magnetic pole coupled to the rear end of the iron core 4a, and a yoke 4c coupled to the other magnetic pole of the magnet 4b. It comprises a signal coil 4d wound around an iron core 4a. The yoke 4c integrally has a bracket 4e, and the bracket 4e is fixed to a predetermined mounting portion.
Although a dedicated rotating body 3a that constitutes the rotor 3 may be used, in many cases, an accessory component of the engine such as a flywheel of a flywheel magnet rotor is used as the rotating body 3a.
The reluctor 3b is formed on the specific portion (for example, the outer peripheral portion of the flywheel or the boss portion) by utilizing it as a.

In the example shown in FIG. 7, the reluctor is composed of a projection, but the reluctor causes a magnetic flux change in the signal emitting electrons when facing the magnetic pole of the signal emitting electron and when ending the facing. This reluctor can be formed by a recess, as long as the reluctance can be achieved.

In the above signal generator, when the rotor 3 rotates in synchronization with the rotation of the engine, the reluctor 3b starts to face the magnetic pole portion 4a1 of the signal generating electron, and the reluctor 3b.
As shown in FIG. 8 (A), pulse-shaped signals Vs1 and Vs2 having different polarities are generated in the signal coil 4d due to changes in magnetic flux generated in the iron core 4a when the magnetic pole portion 4a1 ends facing the magnetic pole portion 4a1.

When the signal generator as described above is used, it is assumed that the time from the generation of the signal Vs1 at the position of the angle θ1 to the generation of the signal Vs2 at the position of the angle θ2 is Ta and the rotation speed of the engine is N. , The time Ta and the polar arc angle α of the reluctor 3b
(Angle interval between the signals Vs1 and Vs2) is α = 6N
Since there is a relationship of Ta, the generation interval T of the signals Vs1 and Vs2
The engine rotation speed N can be obtained by sampling a as the rotation speed detection time.

The microcomputer stores in its ROM a map giving the relationship between the engine rotation speed and the ignition position, and each time the rotation speed is detected from the rotation speed detection time Ta, each cylinder at that rotation speed is detected. The ignition position of is calculated and determined by an interpolation method using a map. In this case, for example, the signal Vs2 is used as a reference signal and its generation position θ2 is used as a reference position, and the time required for the engine to rotate from the reference position to the ignition position of each cylinder is calculated as the ignition position measurement time for each cylinder. To do. For example, when the internal combustion engine has three cylinders, as shown in FIG. 8B, the time required for the engine to rotate from the reference position θ2 to the ignition positions of the first to third cylinders is set to the first, respectively. Or calculated as the ignition position measurement times Ti1, Ti2 and Ti3 for the third cylinder. Then, when the reference signal Vs2 is generated (when the reference position is detected), the measurement of the ignition position measurement times Ti1, Ti2 and Ti3 is started, and the measurement of the ignition position measurement times Ti1, Ti2 and Ti3 is completed. Ignition signals Vi1, Vi2 and Vi3 for the first to third cylinders are generated at θi1, θi2 and θi3, respectively. The interval of generation of these ignition signals is 12
It is 0 degrees. When the ignition signals Vi1, Vi2, and Vi3 are generated, the ignition circuits for the first to third cylinders generate high voltages for ignition, and sparks are generated on the ignition plugs respectively attached to the first to third cylinders. Cause

[0009]

When the predictive control method as described above is adopted, after sampling the rotational speed detection time Ta, each instantaneous rotational speed during one revolution of the engine is constant. The ignition position of the cylinder can be accurately determined as calculated, but if the instantaneous rotation speed fluctuates, the ignition position of each cylinder cannot be accurately determined, and the ignition position of each cylinder is It will be displaced from the normal position.

For example, in the example shown in FIG. 8, if the rotation speed when the ignition position measurement time Ti1 is measured becomes faster than the rotation speed when the rotation speed detection time Ta is sampled, then FIG. As shown in (C),
Since the angle of rotation during the measurement of the ignition position measurement time Ti1 from the reference position θ2 becomes larger than that when there is no fluctuation in the rotation speed, the ignition position θi1 ′ lags behind the regular ignition position θi1. Conversely, when the ignition position measurement time Ti1 is measured, the rotation speed is the time T for rotation speed detection.
If it becomes slower than the rotation speed when a is sampled, the rotation angle becomes smaller during the measurement of the ignition position measurement time from the reference position than when there is no fluctuation in the rotation speed. The ignition position is advanced from θi1.

In particular, when the engine is started by rope start or kick start, the fluctuation of the crankshaft rotation speed during the starting operation (cranking) is very large, so that the above-described predictive control method starts the engine. The ignition position at that time could not be accurately determined. Therefore, when the ignition control is performed by the predictive control method at the time of starting the engine, there are problems that the startability is deteriorated and the after-fire is generated to deteriorate the operation feeling at the time of starting. Further, if the ignition position is greatly deviated at the time of starting, there is a risk that a spark may be generated relatively early in the compression stroke and the engine may be reversed.

Therefore, conventionally, even when the predictive control system is adopted, a signal generator for generating an ignition signal for starting is provided, and each cylinder is provided at a constant angular position determined by the configuration of the signal generator. I was trying to give an ignition signal to the ignition circuit. However, in this case, since it is necessary to generate ignition signals for start-up for the number of cylinders, it is necessary to generate signal-generating electrons for only the number of cylinders, and to avoid the cost increase due to the complicated configuration of the signal generator. I couldn't do it.

The object of the present invention is to improve the startability by reducing the deviation of the ignition position at the time of start without complicating the structure of the signal generator, and at the same time, to cause an abnormal phenomenon such as reverse start and afterfire. It is an object of the present invention to provide an ignition control method for a multi-cylinder internal combustion engine, in which the above-mentioned problems can be prevented and the starting feeling can be improved and the safety can be improved.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an ignition control method for controlling ignition of a multi-cylinder internal combustion engine.
In the ignition control method targeted by the present invention, n cylinders (n is 3
(The above integer) When an ignition signal for each cylinder of the internal combustion engine is given, an ignition circuit that provides a high voltage for ignition to the ignition plug of each cylinder is provided for each cylinder and synchronized with the internal combustion engine. A signal generator that rotates in accordance with the present invention is provided, and a fixed rotation angle position of the engine is detected as a reference position from the output signal of the signal generator, and the rotation speed of the engine is detected from the generation interval of the output signal of the signal generator. Then, each time the rotation speed is detected, the ignition position of each cylinder at the detected rotation speed is determined, and the time required for the engine to rotate from the reference position to the determined ignition position of each cylinder is set to the ignition time for each cylinder. It is calculated as position measurement time, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started, and when the measurement of the ignition position measurement time for each cylinder is completed, the ignition signal for each cylinder is calculated. Generate.

In the present invention, the specific position at which the signal generator generates a signal is set to be equal to the ignition position at the time of starting specific cylinders of nm (m is an integer of 1 or more and less than n). From the start of the operation of the internal combustion engine until the rotational speed of the engine reaches the set value, when the signal generator generates a signal at a specific position, the ignition circuits for the n−m specific cylinders are provided. Only when the engine speed exceeds the set value, the primary start ignition mode for giving the ignition signal is performed, and after the engine speed exceeds the set value, the secondary start ignition mode for giving the ignition signal to the ignition circuits for the other cylinders is also performed.

In the above method, in the secondary starting ignition mode, ignition signals may be given to the ignition circuits for all the cylinders regardless of the rotational speed of the engine.
It is also possible to increase the number of ignition circuits that give ignition signals stepwise in accordance with the increase in the engine speed, and finally give the ignition signals to the ignition circuits for all the cylinders.

In the method of the present invention, ignition is performed only in some cylinders at the start of the engine starting operation, and a process in which the rotation at the start of the engine shifts to a stable state is detected to stabilize the rotation to some extent. Then, the primary start ignition mode is switched to the secondary start ignition mode. In the above configuration, the process in which the rotation of the engine shifts to a stable state is detected by detecting the rotation speed of the engine.
This detection may be performed by other methods. For example, the process in which the rotation of the engine shifts to a stable state may be detected with the passage of time after the start operation is started.

That is, during the period from the start of the operation of starting the internal combustion engine to the elapse of the set time, when the signal generator generates a signal at a specific position, the ignition for nm specific cylinders is performed. The primary start ignition mode that gives an ignition signal only to the circuit is performed, and the secondary start ignition mode that gives an ignition signal to the ignition circuits of other cylinders is performed after the set time has elapsed after the start operation was started. You may allow it.

In this case as well, in the secondary starting ignition mode, the ignition signal may be given to the ignition circuits for all the cylinders regardless of the rotational speed of the engine, which is set after the starting operation is started. After the lapse of time, the number of ignition circuits that give an ignition signal may be increased every time a predetermined time has passed so that the ignition signals are finally given to the ignition circuits for all the cylinders.

Further, a throttle opening detecting means for detecting the opening of a throttle valve for adjusting the amount of fuel supplied to the internal combustion engine as the throttle opening is provided, and the throttle opening is started after the starting operation of the internal combustion engine is started. When the signal generator generates a signal at a specific position, the ignition signal is given only to the ignition circuits for the n-m specific cylinders until the degree reaches the set value. After reaching, the ignition signal may be given to the ignition circuits of other cylinders.

In this case as well, in the secondary starting ignition mode, after the throttle opening reaches the set value, the ignition signals may be given to the ignition circuits for all the cylinders regardless of the throttle opening. Well, after the throttle opening reaches the set value, the number of ignition circuits that give ignition signals is increased stepwise as the throttle opening increases, and finally the ignition signals for all the cylinders are output. May be given.

In the primary ignition mode, n-
The ignition signal given to the m specific cylinders may be an ignition signal generated when the signal generator generates a signal at a specific rotation angle position, and the ignition signal may be generated in any manner. For example, the signal generated by the signal generator at a specific rotation angle position may be waveform-shaped to obtain an ignition signal to be supplied to the ignition circuit for the specific cylinder in the primary start ignition mode. When a signal is generated at a specific rotation angle position, an ignition signal to be given to the ignition circuit for a specific cylinder may be generated on the software of the microcomputer.

In the second starting ignition mode, n-
The ignition signal applied to the m specific cylinders may be an ignition signal generated when the signal generator generates a signal, or may be an ignition signal generated by measuring the ignition position measurement time.

In the present invention, the number of cylinders that can be ignited in the primary start ignition mode is determined by the number of signals that one signal generating electronic signal can generate. As shown in FIG. 7, when one signal generator is provided in a signal generator using a rotor having one reluctor, two signals are generated per rotation, and therefore, two signals of these two signals are generated. By making the generation positions equal to the ignition positions of the first cylinder and the second cylinder at the time of starting, it is possible to ignite the two cylinders in the primary starting ignition mode.

Even if it is possible to obtain two signals per revolution from the signal generator, it does not necessarily mean that two cylinders must be ignited in the primary start ignition mode. One of the signals may be set equal to the ignition position at the start of a specific cylinder so that the ignition is performed only in the specific one cylinder in the primary start ignition mode.

In the present invention, in the primary start ignition mode, it is preferable to detect each instantaneous rotation speed of the engine, so that a plurality of signals generated by the signal generator are successively generated at small angular intervals. It is preferable to detect the rotation speed by measuring the time interval of the signal. For example, when the signal generator generates the first and second signals Vs1 and Vs2 at the first rotation angle position θ1 and the second rotation angle position θ2, respectively, as shown in FIG. Signal Vs2
It is preferable to detect the rotational speed in the starting ignition mode by measuring the time Ta between the time and.

The method of detecting the rotational speed of the engine during steady operation is arbitrary, and by measuring the generation interval of any of the plurality of signals generated by the signal generator while the engine makes one revolution. The rotation speed may be detected. For example, in FIG. 3A, the rotation speed may be detected from the time from the generation of each signal Vs1 to the generation of the next signal Vs1 (the time required for the engine to make one revolution).

[0028]

According to the above method, when the signal generator generates a signal at a specific rotation angle position when the engine is started, the ignition signal is output to the ignition circuit for the (n-m) -th cylinder among the ignition circuits for the n-cylinder. Given. The position where the signal generator generates the signal is
Since these are determined by the mechanical configuration of the signal generator, these n
The ignition position at the start of the -m cylinder is always constant, and the ignition operation is performed at the normal ignition position suitable for the start. nm
When ignition is performed in each cylinder, the engine speed increases. Prediction control (control that determines the ignition position by measuring the ignition position measurement time, as the rotation speed of the engine increases and the rotation stabilizes, and fluctuations in the instantaneous rotation speed decrease. ) Is possible. Therefore, in the method of the present invention, after the engine is started by igniting specific n−m cylinders, the engine rotation speed is set to a set value (the rotation speed that does not hinder the prediction control). When it exceeds, the measurement of the ignition position measurement time is started and the ignition signal is also given to the ignition circuits for the other cylinders, thereby increasing the number of cylinders to be ignited and stabilizing the rotation.

As described above, when the ignition signal is supplied only to some of the cylinders at the start of starting, the signal generator does not need to generate the ignition signals for all the cylinders, so that the signal generator is configured. Can be simplified.

The error in predicting control of the ignition position is smaller as the ignition position measurement time is shorter. Therefore, for a cylinder whose ignition position is close to the reference position, even if the rotation is not so stable (the engine after the start of start-up) It is possible to determine the ignition position by the predictive control even when the rotation speed of the engine is not so high. On the other hand, in the cylinder whose ignition position is far from the reference position, the ignition position measurement time becomes long, so in order to reduce the error of the ignition position when the ignition position is determined by the predictive control, the engine rotation You have to wait until the speed increases to some extent and the rotation stabilizes.

Therefore, in order to smoothly start the engine, after igniting only the mn specific cylinders to start the engine, the ignition position is set to the reference position in the region where the engine speed exceeds the set value. In order to start the degree-of-ignition operation in the other cylinders in order from the cylinder closer to, the number of ignition circuits for other cylinders that give an ignition signal each time the rotation speed increases by a predetermined value is increased. Is preferred. In this way, n
It is possible to smoothly start the engine by shortening the period during which the ignition is performed only in some -m cylinders.

The present invention is not limited to the case where the number of ignition circuits for giving an ignition signal is increased stepwise when the rotational speed of the engine exceeds a set value after the start as described above. Alternatively, by setting the set value of the rotational speed at which the predictive control is started to a relatively large value, it is possible to start ignition of all the cylinders when the rotational speed of the engine exceeds the set value.

In the above description, the ignition modes at the time of starting are changed from the primary ignition mode to the second ignition mode in accordance with the increase in the rotation speed of the engine.
Although it was configured to switch to the secondary ignition mode, the primary startup ignition mode is performed until the elapsed time reaches the set value by observing the passage of time from the time when the starting operation is started, and the elapsed time The same effect can be obtained also in the case of shifting to the secondary starting ignition mode after exceeding the set value.

Further, in general, when the engine is started, the starting operation is started with the throttle valve throttled, and the throttle valve is opened in accordance with the progress of the starting process of the engine.
Even if the opening degree of the throttle valve is detected and the starting ignition mode is switched according to the increase of the opening degree, the same effect as above can be obtained.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a structural example of a hardware portion of an ignition device for carrying out an ignition control method of the present invention. In FIG. 1, reference numeral 1 is a signal generator attached to an output shaft of an engine. The signal generator 1 is similar to that shown in FIG. 7, and includes a rotor 3 having a reluctor 3b, a signal coil 4d wound around an iron core 4a, and a magnet 4 magnetically coupled to the iron core.
and a signal generating electron 4 having b and generate a first signal Vs1 and a second signal Vs2 having a waveform as shown in FIG. 3 (A) with respect to the rotation angle θ of the engine. The generation position of the first signal Vs1 is the first rotation angle position θ1, and the generation position of the second signal Vs2 is the second rotation angle position θ2.

In this specification, the signal generation position is
This is the position where the signal reaches a level that can be recognized by the circuit, and the position where the signal reaches a predetermined threshold level. In the waveform diagrams of FIGS. 3 and 4, for convenience sake, the position where the signal reaches the peak is defined as the signal generation position. Further, in FIGS. 3 and 4, the number of cylinders n of the engine is 4.

In FIG. 1, U1 to Un are ignition circuits for the first to nth cylinders provided for the first to nth cylinders of an n-cylinder (n is an integer not less than 3) internal combustion engine. , These ignition circuits are respectively ignition coils IG1 ~
It has IGn. The ignition circuits U1 to Un for the first to n-th cylinders control the primary currents of the ignition coils IG1 to IGn when an ignition signal is applied to the ignition circuits U1 to Un, to cause a rapid change in the primary currents. Due to this change in the primary current, a high voltage for ignition is induced in the secondary coils of the ignition coils IG1 to IGn. The outputs of the secondary coils of the ignition coils IG1 to IGn are applied to the ignition plugs P1 to Pn of the first cylinder to the nth cylinder. As the ignition circuit, a capacitor discharge type circuit and a current interruption type circuit are known, but any type of ignition circuit may be used in the present invention.

The output of the signal coil 4d is the waveform shaping circuit 11
And 12 and the waveform shaping circuit outputs the first signal Vs1 and the second signal Vs2 shown in FIG. 3A to the first pulse as shown in FIGS. 3B and 3C, respectively. The signal Vp1 and the second pulse signal Vp2 are converted. These pulse signals Vp1 and Vp2 are respectively OR circuits OR1
And OR2 through the ignition circuit U1 for the first cylinder and the second
Ignition signals Vi1 (FIG. 3D) and Vi to the ignition circuit U2 for the cylinder
2 (FIG. 3E).

Reference numeral 15 is a microcomputer for controlling the ignition position, which includes a CPU 16, a RAM 17 and a ROM 18.
, Counter 19, comparator 20, register 2
1 and. Although only one comparator 20 and one register 21 are shown in FIG. 1, they are provided for the number of cylinders. The signal obtained from the signal coil 4d is converted into a signal which can be recognized by the microcomputer by the waveform shaping circuit 13 and input to the CPU 16. The CPU executes a series of ignition control processes according to a predetermined program stored in the ROM.

The CPU 16 calculates the engine speed from the time Ta from the generation of the first signal Vs1 to the generation of the second signal Vs2, and stores the calculation result in the RAM. The rotation speed detecting means is realized by this process.
The CPU also uses an ignition position determination map (a table that gives a relationship between the rotation speed and the ignition position) stored in the ROM each time the rotation speed is detected, by an interpolation method for each cylinder at each rotation speed. The ignition position is calculated and determined. The ignition position of each cylinder is calculated in the form of the time required for the engine to rotate from the reference position to the ignition position of each cylinder at the detected rotational speed (ignition position measurement time),
The calculation result is stored in the RAM.

The CPU 16 also discriminates the reference signal from the signal inputted through the waveform shaping circuit 13 and, in the steady operation, when detecting that the reference signal is generated, the ignition position measurement time (reference position) for each cylinder is determined. To the ignition position of each cylinder, the counter 19 is started at the same time that the count value to be counted by the counter while the engine is rotating is transferred to the register 21 for each cylinder. In the present embodiment, the second signal Vs2 is used as a reference signal, and the generation position of the second signal (second
(Rotation angle position of) is used as the reference position.

The comparator 20 for each cylinder compares the count value of the counter with the ignition position measurement time for each cylinder,
When they match, an ignition position detection signal for each cylinder is generated. The CPU 16 gives an ignition command signal for each cylinder to the ignition signal supply circuit 22 when the ignition position detection signal for each cylinder is generated, and the ignition signal supply circuit 22 receives the ignition instruction signal for each cylinder from the CPU 16. When it does, the ignition signal for the corresponding cylinder is output. Among the ignition signals output by the ignition signal supply circuit 22, the ignition signals Vi1 'and Vi2' for the first cylinder and the second cylinder are respectively output as ignition signals Vi1 and Vi2 through OR circuits OR1 and OR2.
1 and U2. Also, the ignition signals Vi3 to Vin
Are respectively applied directly to the ignition circuits U3 to Un.

In FIG. 1, reference numeral 23 is a hardware / soft switching circuit. This switching circuit bypasses the outputs of the waveform shaping circuits 11 and 12 from the OR circuits OR1 and OR2 when a switching command is given from the CPU 16, Ignition circuit U from the waveform shaping circuits 11 and 12 side (from the signal generator side)
It serves to prevent the ignition signals from being supplied to 1 and U2 so that the ignition signals are supplied from the ignition signal supply circuit 22 side to the ignition circuits U1 and U2. The hardware / soft switching circuit 23 can be configured by a bypass switch such as a transistor which is connected in parallel between the output terminals of the waveform shaping circuits 11 and 12 and is turned on when a switching command signal is given from the CPU 16.

In the ignition control method of this embodiment, the signal generator 1 produces the first signal Vs1 and the second signal Vs2, respectively, at the first rotational angular positions θ1 and θ2 at the time of starting. The ignition position θi1 of the cylinder and the ignition position θi2 of the second cylinder are set equal to each other, and the starting ignition mode is performed when the engine is started. In the starting ignition mode, as described below, the primary starting ignition mode and the secondary starting ignition mode are sequentially performed, and the ignition mode is set to the steady-state ignition after it is confirmed that the engine has been started. Switch to mode. In this case, the polar arc angle α of the reluctor 3b of the rotor of the signal generator is 360 / n degrees (n is the number of cylinders).

In the primary start ignition mode, the ignition circuits U1 to Un are ignited from the CPU side through the ignition signal supply circuit 22 from the start of the operation of starting the internal combustion engine until the rotational speed of the engine reaches the set value. 3 (D) to (G) when the signal generator 1 generates signals Vs1 and Vs2 at the first rotation angle position θ1 and the second rotation angle position θ2, respectively, when the signals are prevented from being given. As shown in, the ignition circuit U1 for the first cylinder and the ignition circuit U2 for the second cylinder
Only give an ignition signal to. In order to prevent the ignition signal from being given from the CPU side, for example, the ignition position measurement time is not transferred to the register 21 when the reference signal is generated (the ignition position measurement time is not measured). Alternatively, even if the ignition position measurement time is measured, the ignition command signal may not be supplied to the ignition signal supply circuit 22 when the comparator 20 generates the ignition position detection signal.

The position where the output signal of the signal generator 1 is generated is determined by the mechanical structure of the generator and is constant irrespective of the rotation speed. Therefore, the first cylinder and the second cylinder in the above-mentioned primary start ignition mode are used. The ignition position of the cylinder is always constant, and ignition is performed at an ignition position suitable for starting the engine. Since an internal combustion engine starts when even one cylinder is ignited,
The engine begins to rotate. As a result, as the engine speed increases, the engine speed stabilizes and fluctuations in the engine speed at each moment decrease, so predictive control is used to determine the ignition position (measuring the ignition position measurement time). It becomes possible to determine the ignition position for each cylinder.

Therefore, in the present embodiment, the secondary start ignition mode in which the ignition signal is also applied to the ignition circuits for the cylinders other than the first cylinder and the second cylinder after the engine speed exceeds the set value No. To perform. In the example of FIG. 3, the secondary starting ignition mode is started when the engine speed becomes equal to or higher than the set value No, and as shown in the right half of FIG. To the ignition signal Vi3. Next, when the rotation speed becomes equal to or higher than the set value N1, the ignition signal Vi4 is given to the ignition circuit of the fourth cylinder as shown at the right end of FIG.

In the secondary starting ignition mode, as described above, the ignition operation is started first from the cylinder having the smaller angle from the reference position to the ignition position (the cylinder having the shorter ignition position measurement time). Preferably.

As a result of performing the secondary starting ignition mode, when it is detected that the engine rotation speed has reached the start completion rotation speed, the CPU 16 causes the hardware / software switching circuit 23 to operate.
A switching command signal to bypass the outputs of the waveform shaping circuits 11 and 12 from the OR circuits OR1 and OR2, so that the CPU 16 can provide an ignition signal through the ignition signal supply circuit 22 to set the ignition mode to a steady point. Switch to fire mode.

The flowchart of FIG. 5 shows a control algorithm in the case of controlling the ignition of the internal combustion engine of the n-cylinder by the ignition control method of this embodiment. In FIG. 5, “hard ignition” means that an ignition signal generated by passing the output signal of the signal generator 1 through a waveform shaping circuit (hardware circuit) is given to the ignition circuit to cause ignition. "Soft ignition" means that ignition is performed by applying an ignition signal generated by measuring the ignition position measurement time using software to the ignition circuit.

In the example of FIG. 5, in the primary start ignition mode, first, an ignition signal is given to the ignition circuits for the first cylinder and the second cylinder by the output signal of the signal generator to ignite these cylinders. Next, when the rotation speed N becomes equal to or higher than the first set value No, the secondary starting ignition mode is started. This second
In the next start ignition mode, when it is detected that the reference signal is generated, the measurement of the ignition position measurement time for the third cylinder is started, and when the measurement is finished, the ignition signal is sent to the ignition circuit for the third cylinder. give. Next, the rotation speed N is the set value N1.
After (> No) or more, measurement of the ignition position measurement time for the fourth cylinder is started at the reference position, and when the measurement of the measurement time ends, an ignition signal is given to the ignition circuit for the fourth cylinder. To ignite the fourth cylinder.

When the final cylinder is ignited and the rotation speed N becomes equal to or higher than the start completion rotation speed Ns, a switching command signal is given to the hardware / software switching circuit 23 to make the waveform shaping circuit 1
The ignition signals are prevented from being applied to the ignition circuits U1 and U2 from the 1 and 12 sides, and the ignition mode is shifted to the steady point ignition mode.

In the present embodiment, the starting point ignition control means is realized by the process of performing the primary starting ignition mode and the secondary starting ignition mode, respectively, and the stationary point ignition control is performed by the process of executing the stationary point ignition mode. The control means is realized.

Further, when the rotation speed becomes Ns or more, a switching command signal is given to the hardware / soft switching circuit 23 to shift the ignition mode to the steady point ignition mode, and the ignition is switched between the start point ignition mode and the steady point ignition mode. A mode switching means is realized.

In the steady time ignition mode, as shown in FIGS. 4A to 4G, the ignition position measurement times Ti1 to Ti4 are started to be measured at the reference position θ2, and the measurement of these measurement times is completed. At times, ignition signals Vi1 to Vi4 are applied to the ignition circuits for the first to fourth cylinders, respectively.

In the above-described embodiment, the ignition signals for the first cylinder and the second cylinder are obtained by passing the output of the signal generator through the waveform shaping circuit in the primary start ignition mode. In the ignition mode, the signal generator outputs the signal V
The ignition signals for the first cylinder and the second cylinder may be generated by software when s1 and Vs2 are generated. FIG. 2 shows the hardware configuration when the ignition signals for the first cylinder and the second cylinder are generated by software in the primary start ignition mode, and FIG. 6 shows the control algorithm in that case. There is. The configuration of the ignition device shown in FIG. 2 is the same as the configuration of the ignition device shown in FIG. 1 except that the waveform shaping circuits 11 and 12 and the OR circuits OR1 and OR2 of FIG. 1 are omitted.

The flowchart of FIG. 6 is the same as that shown in FIG. 5 except that the ignition signal for the first cylinder and the ignition signal for the second cylinder are generated by software in the primary starting ignition mode. is there. In FIG. 6, the "soft start ignition position" means the ignition position at the start of start, which is determined by the ignition signal generated by the software detecting that the signal generator has generated the signal. Other points are the same as those shown in FIG.

In the above embodiment, in the secondary starting ignition mode, another cylinder that gives an ignition signal in response to an increase in the engine speed (cylinders other than the cylinder that ignites in the primary starting ignition mode). The number of ignition circuits for the cylinders is gradually increased to finally give an ignition signal to the ignition circuits for all the cylinders. In the secondary starting ignition mode,
Ignition signals may be given to the ignition circuits for all the cylinders regardless of the rotational speed of the engine.

In the above embodiment, in order to detect the process in which the rotation of the engine shifts to a stable state at the time of starting, the rotation speed of the engine is detected, and the primary speed is detected every time the rotation speed reaches a predetermined set value. Switching from the starting ignition mode to the secondary starting ignition mode, switching of the number of cylinders that give an ignition signal in the secondary starting ignition mode, and switching from the starting ignition mode to the steady ignition mode are performed. However, in the present invention, the method of detecting the process in which the rotation at the time of starting shifts to a stable state is
It is not limited to the method of detecting the rotation speed. For example, the process in which the engine rotation shifts to a stable state may be detected depending on the time elapsed from the start operation start time. In this case, the timer is started at the same time as the start operation is started, and the elapsed time Tx from the start operation start time is measured.
The mode is switched at any time according to x. Further, a means for detecting the opening of the throttle valve may be provided to switch the mode according to the increase of the throttle opening.

In the above embodiment, the flow chart in the case of switching the mode according to the elapsed time from the start of the starting operation is the one in which the "rotation speed" is replaced with the "elapsed time" in FIG. 5 or FIG. Also, the flow chart for switching the mode according to the throttle opening is
In FIG. 5 or 6, “rotation speed” is replaced with “throttle opening”.

In the above embodiment, the first cylinder and the second cylinder are ignited in the primary start ignition mode, but only the first cylinder or the second cylinder may be ignited. Generally, in the primary ignition mode,
The ignition operation may be performed in mn (1 ≦ m <n) cylinders.

Although the embodiments of the present invention have been described above, the main embodiments of the invention disclosed in the present specification will be listed below.

(1) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is provided for each cylinder A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. The ignition mode is set to the start point ignition mode until the engine rotation speed reaches the start completion rotation speed after the start operation of the internal combustion engine is started, and the ignition mode is set to the steady point ignition after the start completion rotation speed is reached. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is set at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give an ignition signal, front Wherein until the rotational speed reaches the set value after the start operation of the engine is started in the starting ignition mode at the position where the signal generator generates a signal n-m
A primary start ignition mode is performed in which an ignition signal is supplied to the ignition circuits for the specific cylinders, and the signal generator generates a signal after the engine speed exceeds a set value in the ignition mode at the start time. The ignition signal for the specific cylinder at a position where the ignition is performed, and the ignition position measurement time for the other cylinder is measured, and the ignition for the other cylinder is performed at the position where the measurement time is finished. An ignition control method for a multi-cylinder internal combustion engine, characterized in that a secondary start ignition mode in which an ignition signal is also applied to a circuit is performed.

(2) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an n-cylinder (n is an integer of 3 or more) internal combustion engine is provided to each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. The ignition mode is set to the starting point ignition mode until the engine rotation speed reaches the start completion rotation speed after the start operation of the internal combustion engine is started, and the ignition is performed after the engine rotation speed reaches the start completion rotation speed. The mode is switched to the steady point ignition mode, and in the steady point ignition mode, the ignition signals are supplied to the ignition circuits for all the cylinders by measuring the ignition position measurement time, and the internal ignition in the start point ignition mode is performed. The ignition circuit for the n-m specific cylinders when the signal generator generates a signal at a specific position from the time when the engine start operation is started until the engine speed reaches the set value. To perform a primary start ignition mode in which an ignition signal is given, and after the engine speed exceeds a set value in the start point ignition mode, the ignition position measurement times for all cylinders are measured. An ignition control method for a multi-cylinder internal combustion engine, characterized in that a secondary starting ignition mode for giving an ignition signal to an ignition circuit for each cylinder is performed at a position where measurement of an ignition position measurement time for each cylinder is completed.

(3) An ignition circuit that applies a high voltage for ignition to the ignition plug of each cylinder when an ignition signal for each cylinder of an n-cylinder (n is an integer of 3 or more) internal combustion engine is provided to each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. The ignition mode is set to the starting point ignition mode until the engine rotation speed reaches the start completion rotation speed after the start operation of the internal combustion engine is started, and the ignition is performed after the engine rotation speed reaches the start completion rotation speed. The mode is switched to the steady-state fire mode, and in the steady-state fire mode, the ignition position measurement time for all cylinders is measured, and each cylinder is positioned at the position where the measurement of the ignition position measurement time for each cylinder is completed. Point on the ignition circuit for When a signal is given and the signal generator generates a signal at a specific position from the start of the operation of starting the internal combustion engine in the start-time ignition mode until the rotational speed of the engine reaches a set value, the n -When the primary starting ignition mode of giving an ignition signal to the ignition circuits for m specific cylinders is performed, and the engine speed exceeds the set value in the starting ignition mode, the signal generator is When a signal is generated at a specific position, an ignition signal is given to the ignition circuits for the n-m specific cylinders and the ignition position measurement time for other cylinders is measured to increase the rotational speed of the engine. In accordance with the above, the number of ignition circuits for other cylinders that give ignition signals is increased stepwise to finally perform the second starting ignition mode that gives ignition signals to the ignition circuits for all the cylinders. For multi-cylinder internal combustion engine Control method.

(4) An ignition circuit that applies a high voltage for ignition to the ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is applied to each cylinder A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. The ignition mode is set to the starting point ignition mode until the engine rotation speed reaches the start completion rotation speed after the start operation of the internal combustion engine is started, and the ignition is performed after the engine rotation speed reaches the start completion rotation speed. The mode is switched to the steady-state fire mode, and in the steady-state fire mode, the ignition position measurement time for all cylinders is measured, and each cylinder is positioned at the position where the measurement of the ignition position measurement time for each cylinder is completed. Point on the ignition circuit for When a signal is given and the signal generator generates a signal at a specific position from the start of the operation of starting the internal combustion engine in the start-time ignition mode until the rotational speed of the engine reaches a set value, the n The primary starting ignition mode in which an ignition signal is supplied to the ignition circuits for the m specific cylinders, and the ignition position for each cylinder after the engine speed exceeds a set value in the starting ignition mode. By giving an ignition signal to the ignition circuit for each cylinder at the position where the measurement of the measurement time is completed, the number of ignition circuits that give an ignition signal is increased stepwise as the engine speed increases, and finally An ignition control method for a multi-cylinder internal combustion engine, characterized in that a secondary starting ignition mode for giving an ignition signal to all the ignition circuits for all cylinders is performed.

(5) An ignition circuit for applying a high voltage for ignition to the ignition plug of each cylinder when an ignition signal for each cylinder of an n-cylinder (n is an integer of 3 or more) internal combustion engine is provided for each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. Every other time, the ignition mode is set to the ignition time point ignition mode until a certain time has elapsed after the start operation of the internal combustion engine is started, and the ignition mode is the stationary time point ignition mode after the elapse of a certain time period after the start operation is started. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal, said start In the ignition mode, an ignition signal is given to the ignition circuits for the n-m specific cylinders at a position where the signal generator generates a signal until a preset time elapses after the engine starting operation is started. The ignition circuit for the specific cylinder is ignited at a position where the signal generator generates a signal after a set time has elapsed after starting the engine start operation in the ignition mode at the starting time in the primary ignition mode. A secondary start ignition mode in which a signal is given and an ignition position measurement time for another cylinder is measured, and an ignition signal is also given to an ignition circuit for another cylinder at a position where the measurement of the measurement time is completed. An ignition control method for a multi-cylinder internal combustion engine, characterized in that the method is performed.

(6) An ignition circuit that applies a high voltage for ignition to the ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is applied to each cylinder A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. Every other time, the ignition mode is set to the ignition time point ignition mode until a certain time has elapsed after the start operation of the internal combustion engine is started, and the ignition mode is the stationary time point ignition mode after the elapse of a certain time period after the start operation is started. The ignition signal is supplied to the ignition circuits for all the cylinders by measuring the ignition position measurement time in the steady time ignition mode, and the starting operation of the internal combustion engine is started in the ignition time ignition mode. The primary start ignition that gives an ignition signal to the ignition circuits for the n-m specific cylinders when the signal generator generates a signal at a specific position after the set time has elapsed Mode is performed, and after the set time has elapsed after the start operation has been started in the ignition mode at the time of starting, the measurement of the ignition position measurement time for all cylinders is started to set the ignition position measurement time for each cylinder. An ignition control method for a multi-cylinder internal combustion engine, characterized in that a secondary starting ignition mode for giving an ignition signal to an ignition circuit for each cylinder is performed at a position where measurement is completed.

(7) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an n-cylinder (n is an integer of 3 or more) engine is provided A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. Every other time, the ignition mode is set to the ignition time point ignition mode until a certain time has elapsed after the start operation of the internal combustion engine is started, and the ignition mode is the stationary time point ignition mode after the elapse of a certain time period after the start operation is started. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal, said start The ignition circuit for the n-m specific cylinders when the signal generator generates a signal at a specific position from the start of the internal combustion engine start operation in the ignition mode until the set time elapses. To perform a primary start ignition mode for giving an ignition signal to the engine, and when the signal generator generates a signal at a specific position after a set time has elapsed after the start operation of the engine in the start point ignition mode. Other cylinders that give an ignition signal to the mn specific cylinder ignition circuits and have them measure the ignition position measurement times for the other cylinders, and give the ignition signals as the engine speed increases. Ignition control method for a multi-cylinder internal combustion engine, characterized in that the number of ignition circuits for a plurality of cylinders is increased stepwise to finally perform a secondary ignition mode in which ignition signals are supplied to the ignition circuits for all cylinders. .

(8) An ignition circuit that applies a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is applied to each cylinder A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. Every other time, the ignition mode is set to the ignition time point ignition mode until a certain time has elapsed after the start operation of the internal combustion engine is started, and the ignition mode is the stationary time point ignition mode after the elapse of a certain time period after the start operation is started. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal, said start Wherein n when until the set time after the start operation of the internal combustion engine is started in the ignition mode has elapsed by the signal generator has generated the signal at a particular location
A first starting ignition mode in which an ignition signal is supplied to the ignition circuits for m specific cylinders, and each cylinder is operated after a set time has elapsed after the engine starting operation was started in the starting point ignition mode. Ignition position measurement time for each cylinder is set to give an ignition signal to the ignition circuit for each cylinder, and the number of ignition circuits that give an ignition signal is increased stepwise as the engine speed increases. An ignition control method for a multi-cylinder internal combustion engine, which is characterized in that a secondary starting ignition mode for finally giving an ignition signal to all the ignition circuits for all cylinders is performed.

(9) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an n-cylinder (n is an integer of 3 or more) internal combustion engine is provided to each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. Calculate the time required for the engine to rotate as the ignition position measurement time for each cylinder,
Multi-cylinder internal combustion that starts measurement of the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is set to be equal to an ignition position at the time of starting of mn (m is an integer of 1 or more and less than n) specific cylinders. Every time, the opening degree of the throttle valve that adjusts the amount of fuel supplied to the internal combustion engine can be detected as the throttle opening degree, and the ignition from the start of the internal combustion engine until the start is completed. The ignition mode after the engine is completely started and the ignition mode after the engine is completed are set to the ignition mode at the starting point and the ignition mode at the steady state, respectively, and the ignition mode is set until the throttle opening reaches a predetermined value after the starting operation of the engine is started. Fire at start As a mode, after switching the throttle opening to a predetermined value, the mode is switched to the steady time ignition mode. In the steady time ignition mode, the ignition position measurement times for all the cylinders are measured to measure the ignition position for each cylinder. An ignition signal is given to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time is completed, and the signal generator generates a signal until the throttle opening reaches a set value in the ignition mode at the starting point. At the position, the primary start ignition mode for giving an ignition signal to the ignition circuits for the n-m specific cylinders is performed, and the signal power generation is performed after the throttle opening exceeds the set value in the start point ignition mode. The engine gives an ignition signal to the ignition circuit for the specific cylinder at a position where a signal is generated, and causes the measurement of the ignition position measurement time for another cylinder to be performed, and then another position is set at the position where the measurement of the measurement time is completed. For cylinder Multi-cylinder internal combustion engine ignition control method characterized by causing a second-order starting ignition mode to fire circuit providing an ignition signal.

(10) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is applied to each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed In the ignition control method for a multi-cylinder internal combustion engine, which generates an ignition signal for each cylinder, mn specific positions (m is 1) at which the signal generator generates a signal.
It is set equal to the ignition position at the time of starting a specific cylinder (an integer greater than or equal to n and less than n) so that the opening of a throttle valve that adjusts the amount of fuel supplied to the internal combustion engine can be detected as the throttle opening. , The ignition mode from the start operation of the internal combustion engine until the start is completed and the ignition mode after the start of the engine are set to the start point ignition mode and the steady point ignition mode, respectively, and the engine start operation is After the start, until the throttle opening reaches a predetermined value, the ignition mode is set to the starting point ignition mode, and after the throttle opening reaches a predetermined value, it is switched to the steady point ignition mode. In the ignition mode, the ignition signals are supplied to the ignition circuits for all the cylinders by measuring the ignition position measurement time, and the throttle opening is set in the ignition mode at the starting time. During the period until the value is reached, when the signal generator generates a signal at a specific position, a primary start ignition mode for providing an ignition signal to the ignition circuits for the n-m specific cylinders is performed, After the throttle opening exceeds the set value in the starting-time fire mode, the measurement of the ignition position measurement time for all the cylinders is started, and the measurement of the ignition position measurement time for each cylinder is completed at each cylinder position. Control method for a multi-cylinder internal combustion engine, characterized in that a secondary starting ignition mode for giving an ignition signal to an ignition circuit for a vehicle is performed.

(11) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is provided for each cylinder A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed In the ignition control method for a multi-cylinder internal combustion engine, which generates an ignition signal for each cylinder, mn specific positions (m is 1) at which the signal generator generates a signal.
It is set equal to the ignition position at the time of starting a specific cylinder (an integer greater than or equal to n and less than n) so that the opening of a throttle valve that adjusts the amount of fuel supplied to the internal combustion engine can be detected as the throttle opening. , The ignition mode from the start operation of the internal combustion engine until the start is completed and the ignition mode after the start of the engine are set to the start point ignition mode and the steady point ignition mode, respectively, and the engine start operation is After the start, until the throttle opening reaches a predetermined value, the ignition mode is set to the starting point ignition mode, and after the throttle opening reaches a predetermined value, it is switched to the steady point ignition mode. In the hour ignition mode, the ignition position measurement time for all cylinders is measured, and an ignition signal is given to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for each cylinder is completed. An ignition signal is given to the ignition circuits for the n-m specific cylinders when the signal generator generates a signal at a specific position until the throttle opening reaches a set value in the starting point ignition mode. The primary start ignition mode is performed, and after the throttle opening exceeds the set value in the start point ignition mode, when the signal generator generates a signal at a specific position, the n−m specific The ignition signal is supplied to the cylinder ignition circuit and the ignition position measurement times for the other cylinders are measured, and the number of ignition circuits for the other cylinders that provide the ignition signal is increased stepwise as the throttle opening increases. The ignition control method for a multi-cylinder internal combustion engine is characterized in that a secondary start ignition mode is finally performed in which the ignition signals for all the cylinders are finally increased to provide an ignition signal.

(12) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is applied to each cylinder. A signal generator that rotates in synchronism with the internal combustion engine is provided, and a constant rotational angle position of the engine is detected as a reference position from the output signal of the signal generator, and the signal generator The engine rotation speed is detected from the output signal generation interval, and each time the rotation speed is detected, the ignition position of each cylinder is determined at the detected rotation speed and the ignition position of each cylinder is determined from the reference position. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed In the ignition control method for a multi-cylinder internal combustion engine, which generates an ignition signal for each cylinder, mn specific positions (m is 1) at which the signal generator generates a signal.
It is set equal to the ignition position at the time of starting a specific cylinder (an integer greater than or equal to n and less than n) so that the opening of a throttle valve that adjusts the amount of fuel supplied to the internal combustion engine can be detected as the throttle opening. , The ignition mode from the start operation of the internal combustion engine until the start is completed and the ignition mode after the start of the engine are set to the start point ignition mode and the steady point ignition mode, respectively, and the engine start operation is After the start, until the throttle opening reaches a predetermined value, the ignition mode is set to the starting point ignition mode, and after the throttle opening reaches a predetermined value, it is switched to the steady point ignition mode. In the hour ignition mode, the ignition position measurement time for all cylinders is measured, and an ignition signal is given to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for each cylinder is completed. An ignition signal is given to the ignition circuits for the n-m specific cylinders when the signal generator generates a signal at a specific position until the throttle opening reaches a set value in the starting point ignition mode. The ignition circuit for each cylinder is ignited at a position where the measurement of the ignition position measurement time for each cylinder is completed after the first opening ignition mode is performed and the throttle opening exceeds the set value in the starting ignition mode. A secondary start ignition in which the number of ignition circuits for giving an ignition signal is increased stepwise as the engine speed increases so as to give a signal, and finally an ignition signal is given to the ignition circuits for all the cylinders. An ignition control method for a multi-cylinder internal combustion engine, characterized in that a mode is performed.

(13) A spark plug provided for each cylinder of an n-cylinder (n is an integer of 3 or more) multi-cylinder internal combustion engine and corresponding when an ignition signal for each cylinder is given. An ignition circuit for n cylinders that applies a high voltage for ignition to the engine, and a start of n-m (m is an integer of 1 or more and less than n) specific cylinders that are provided so as to rotate in synchronization with the internal combustion engine. Signal generator for generating a signal at a rotation angle position equal to the ignition position at the time, reference position detection means for detecting a constant rotation angle position of the engine as a reference position from the output signal of the signal generator, and the signal generator. Rotation speed detecting means for detecting the rotation speed of the engine from the generation interval of the output signal of,
Each time the rotation speed is detected, the ignition position of each cylinder at the detected rotation speed is determined, and the time required for the engine to rotate from the reference position to the determined ignition position of each cylinder is ignited for each cylinder. Ignition position calculation means for calculating the position measurement time, and when the ignition position measurement time for each cylinder is started when the reference position is detected and the measurement of the ignition position measurement time for each cylinder is completed. Ignition signal generating means for generating the ignition signal for each cylinder, and the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for each cylinder is completed and the measurement of the ignition position measurement time for each cylinder is completed. A steady point ignition control means for performing a steady point ignition mode for giving an ignition signal, and a position where the signal generator generates a signal until the rotation speed reaches a set value after the start operation of the internal combustion engine is started. Said nm Primary ignition mode for providing an ignition signal to an ignition circuit for a specific cylinder, and an ignition circuit for cylinders other than the specific cylinder after the engine rotation speed exceeds a set value lower than the start completion rotation speed. And a starting ignition control means for performing a secondary starting ignition mode that also gives an ignition signal, and an ignition mode until the engine rotation speed reaches the completion rotation speed after the start operation of the internal combustion engine is started. In the starting point ignition mode, and ignition mode switching means for switching the ignition mode to the steady point ignition mode after the starting completion rotation speed is reached.

[0076]

As described above, according to the present invention, when the signal generator generates a signal at a specific rotation angle position at the time of starting the engine, the ignition circuit for the n cylinders for the n-m cylinders is used. Since an ignition signal is given to the ignition circuit of, and the ignition is performed in other cylinders after the rotation is stabilized to some extent, the ignition position at the start of the start can always be kept constant and the start can be reliably performed. Can be prevented, and afterfire can be prevented from occurring.

Further, since it is sufficient to supply the ignition signals to only some of the cylinders at the start of starting, the configuration of the signal generator is simplified as compared with the case where the ignition signals for all the cylinders are obtained from the signal generator at the time of starting. be able to.

In particular, according to the invention as set forth in claim 3, 6 or 9, in the primary starting ignition mode, after igniting and starting only specific nm cylinders, the secondary starting ignition mode is performed. In order to start the degree-of-ignition operation in other cylinders in order from the cylinder whose ignition position is closer to the reference position, the number of ignition circuits for other cylinders that give an ignition signal is increased. There is an advantage that the engine can be started smoothly by shortening the period in which ignition is performed only in the cylinder.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a hardware part according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a hardware portion of another embodiment of the present invention.

FIG. 3 is a signal waveform diagram for explaining an operation in a starting point ignition mode according to the embodiment of the present invention.

FIG. 4 is a signal waveform diagram for explaining an operation in a normal-time fire mode according to the embodiment of the present invention.

5 is a flowchart showing a control algorithm of the embodiment of FIG.

6 is a flowchart showing a control algorithm of the embodiment of FIG.

FIG. 7 is an explanatory diagram showing a configuration of a signal generator used in an example of the present invention.

FIG. 8 is a signal waveform diagram for explaining a conventional ignition control method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 signal generator 3 rotor 4 signal generator 11 waveform shaping circuit 12 waveform shaping circuit 15 microcomputer 22 ignition signal supply circuit U1 to Un Ignition circuit for first to nth cylinders IG1 to IGn ignition coil

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02P 5/15

Claims (9)

[Claims] 1. An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given to each cylinder. Provided in the opposite direction, provided with a signal generator that rotates in synchronization with the internal combustion engine,
Detecting a constant rotation angle position of the engine as a reference position from the output signal of the signal generator, detecting the rotation speed of the engine from the generation interval of the output signal of the signal generator, and detecting each time the rotation speed is detected. The time required for the engine to rotate from the reference position to the determined ignition position of each cylinder at the determined rotational speed is calculated as the ignition position measurement time for each cylinder. For a multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the position is detected and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed In the ignition control method, the specific position at which the signal generator generates a signal is set equal to the ignition position at the start of specific cylinders of nm (m is an integer of 1 or more and less than n). The start operation of During the period from when the engine speed reaches the set value, the ignition signal is given only to the ignition circuits for the n-m specific cylinders when the signal generator generates a signal at a specific position. In many cases, the primary starting ignition mode is performed, and after the engine speed exceeds the set value, the secondary starting ignition mode is also performed in which the ignition signals for the other cylinders are also given an ignition signal. Ignition control method for cylinder internal combustion engine. 2. In the secondary startup ignition mode, the measurement of the ignition position measurement time for all other cylinders is started, and an ignition signal is given to all the ignition circuits for the other cylinders. The ignition control method for a multi-cylinder internal combustion engine according to claim 1. 3. In the secondary starting ignition mode, an ignition signal is given each time the rotation speed increases by a predetermined value in order to start the ignition operation in other cylinders in order from the cylinder whose ignition position is closer to the reference position. 2. The ignition control method for a multi-cylinder internal combustion engine according to claim 1, wherein the number of ignition circuits is increased to finally give an ignition signal to the ignition circuits for all the cylinders. 4. An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given to each cylinder. Provided in the opposite direction, provided with a signal generator that rotates in synchronization with the internal combustion engine,
Detecting a constant rotation angle position of the engine as a reference position from the output signal of the signal generator, detecting the rotation speed of the engine from the generation interval of the output signal of the signal generator, and detecting each time the rotation speed is detected. The time required for the engine to rotate from the reference position to the determined ignition position of each cylinder at the determined rotational speed is calculated as the ignition position measurement time for each cylinder. For a multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the position is detected and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed In the ignition control method, the specific position at which the signal generator generates a signal is set equal to the ignition position at the start of specific cylinders of nm (m is an integer of 1 or more and less than n). The start operation of During the period from when the signal generator is operated to when the set time has elapsed, when the signal generator generates a signal at a specific position, an ignition signal is given only to the ignition circuits for the n-m specific cylinders. The starting ignition mode is performed, and after the set time has elapsed after the start operation is started, the secondary starting ignition mode that gives an ignition signal to the ignition circuits of other cylinders is also performed. Ignition control method for cylinder internal combustion engine. 5. In the secondary startup ignition mode, measurement of ignition position measurement times for all other cylinders is started, and an ignition signal is supplied to all ignition circuits for other cylinders. The ignition control method for a multi-cylinder internal combustion engine according to claim 4. 6. An ignition circuit that, in the secondary startup ignition mode, provides an ignition signal each time a predetermined time elapses in order to start ignition operations in other cylinders in order from a cylinder whose ignition position is closer to a reference position. 5. The ignition control method for a multi-cylinder internal combustion engine according to claim 4, wherein the ignition signals are finally given to the ignition circuits for all the cylinders by increasing the number of the above. 7. An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given to each cylinder. Provided in the opposite direction, provided with a signal generator that rotates in synchronization with the internal combustion engine,
Detecting a constant rotation angle position of the engine as a reference position from the output signal of the signal generator, detecting the rotation speed of the engine from the generation interval of the output signal of the signal generator, and detecting each time the rotation speed is detected. The time required for the engine to rotate from the reference position to the determined ignition position of each cylinder at the determined rotational speed is calculated as the ignition position measurement time for each cylinder. For a multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the position is detected and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed In the ignition control method, there is provided throttle opening detection means for detecting the opening of a throttle valve that adjusts the amount of fuel supplied to the internal combustion engine as the throttle opening, and the signal generator outputs a signal. The specific position to be set is made equal to the ignition position at the time of starting of n−m number (m is an integer of 1 or more and less than n), and the throttle opening is set after the start operation of the internal combustion engine is started. Until the value is reached, a primary start ignition mode is performed in which when the signal generator generates a signal at a specific position, an ignition signal is given only to the ignition circuits for the n-m specific cylinders. In addition, the ignition control method for a multi-cylinder internal combustion engine, characterized in that after the throttle opening reaches a set value, a secondary starting ignition mode in which an ignition signal is also applied to the ignition circuits of other cylinders is performed. 8. The ignition control method for a multi-cylinder internal combustion engine according to claim 7, wherein in the second starting ignition mode, an ignition signal is given to the ignition circuits for all the cylinders. 9. In the secondary starting ignition mode, an ignition signal is given each time the throttle opening is increased by a predetermined amount in order to start the ignition operation in other cylinders in order from the cylinder whose ignition position is closer to the reference position. 8. The ignition control method for a multi-cylinder internal combustion engine according to claim 7, wherein the number of ignition circuits is increased to finally give an ignition signal to the ignition circuits for all the cylinders.