JPS6233421B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for automatically starting and stopping an automobile engine. The present invention relates to a method for automatically starting and stopping an automobile engine, which maintains the rotation of the engine based on the fact that the automobile is in a running state, and stops the engine when the automobile stops.

[Prior art]

Conventionally, in this type of automatic start/stop method,
When starting a car engine, the starter of the engine is automatically energized and driven in response to the depression of the clutch pedal of the car, and as the rotation speed of the starter increases while the engine is at that rotation speed. When the starter rises and completes its starting, this is detected and the power supply to the starter is cut off to stop the starter.

[Problem that the invention seeks to solve]

By the way, if the engine suddenly stops for some reason immediately after the engine has been started, the rotational speed of the engine will drop rapidly, but the rotational speed of the starter will only drop slowly. Therefore, if the starter is automatically re-energized and driven by depressing the clutch pedal in such a state, the rotational speed of the starter starts to increase from the decreasing value. For this reason, there is a significant difference in the rotational speeds of the starter and engine when the starter is reenergized, and as a result, the pinion provided on the output shaft of the starter
There has been a problem that it cannot mesh smoothly with the ring gear provided on the flywheel of the engine, causing noise such as gear noise or damage such as wear to the connection portion between the starter and the engine, such as the pinion or ring gear.

Therefore, in order to cope with such a problem, the present invention provides a method for automatically starting and stopping an automobile engine, in which when the engine suddenly stops immediately after the power supply to the starter circuit is cut off when the engine is started,
Even if the vehicle's starting operation mechanism is operated, after cutting off the power to the starter circuit, the starter circuit is automatically energized after waiting for the required time for the mechanical rotation system installed in the starter circuit to stop rotating. This is what we are trying to do.

[Means for solving problems]

In order to solve this problem, the structural feature of the present invention is to automatically energize the starter circuit provided in the engine of the automobile in response to the operation of the starting operation mechanism when starting the automobile, and to automatically energize the starter circuit provided in the engine of the automobile. automatically energizing a circuit or a fuel injection amount control circuit to start the engine;
When the engine starts, it is detected and power supply to the starter circuit is cut off, and after the car starts, it is detected that the car is in a running state, and based on this detection result, the ignition circuit or the fuel is turned off. In the method for automatically starting and stopping an engine, the method comprises: maintaining energization to the injection amount control circuit, and stopping the engine by cutting off the energization to the ignition circuit or the fuel injection amount control circuit when the vehicle stops; When the power supply to the starter circuit is cut off, the time required for the mechanical rotation system installed in the starter circuit to stop after the power supply to the starter circuit is cut off is set, and immediately after the power supply to the starter circuit is cut off, the mechanical rotation system provided in the starter circuit is set. When the engine stops, in response to the re-operation of the start operation mechanism, it starts measuring the required time and prohibits automatic re-energization of the starter circuit, and when the measuring of the required time ends, the starter circuit The invention is configured to restart the engine by allowing automatic re-energization of the engine.

[Operation and Effect] By configuring the present invention as described above, when the power supply to the starter circuit is cut off by starting the engine when the automobile is started, the engine starts running immediately after the power supply to the starter circuit is cut off. Even if the start operation mechanism is operated again when the start operation mechanism suddenly stops due to some reason, the measurement of the required time that has already been set when power is cut off to the starter circuit is started in response to the reoperation of the start operation mechanism. At the same time, automatic re-energization of the starter circuit is prohibited, and when the required time measurement is completed, automatic re-energization of the starter circuit is allowed and the engine is restarted, so that the engine is restarted. The engine is restarted by automatically energizing the starter circuit only when the target rotational system has almost stopped, similar to the already stopped engine. Therefore, the mechanical rotation system of the starter circuit is smoothly connected to the engine,
As a result, noise at the connecting part between these two,
The rotational speed of the engine can be increased as the rotational speed of the mechanical rotation system of the starter circuit increases while preventing damage, and the engine can be restarted smoothly. In such a case, the timing of automatic re-energization of the starter circuit always coincides with the stop timing of the mechanical rotation system of the starter circuit, so that the engine can be smoothly restarted quickly after the sudden engine stop mentioned above. can be achieved.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numerals 11 and 12 respectively indicate a starter and an ignition circuit of an automobile engine (fueled by gasoline), and the starter 11 is an ignition circuit. Switch 1
It is connected to a DC power supply 10 via 3. When the ignition switch 13 is operated to temporarily connect its movable contact 13a to the fixed terminal 13c, the starter 11 is supplied with power from the DC power source 10 and starts, putting the engine in a cranking state. The ignition circuit 12 includes a control circuit 12a connected to a signal generator provided in a distributor of the engine, and an ignition coil 12c connected to the control circuit 12a via a transistor 12b. . Under the control of the control circuit 12a, the transistor 12b becomes conductive in response to the generation of a signal from the signal generator and becomes non-conductive in response to the disappearance of the signal from the signal generator. The ignition coil 12c is energized in response to the conduction of the transistor 12b in a state where it can receive power from the DC power supply 10, and is cut off from the energized state in response to the non-conduction of the transistor 12b to generate a spark voltage, and the ignition coil 12c generates a spark voltage. Grant to triviewer.

The alternator 14 is connected between the DC power supply 10 and the regulator relay 15, and when driven by the engine, the alternator 14 generates an AC voltage at the neutral point N of its stator coil. is converted into a DC voltage and supplied to the DC power supply 10. Regulator relay 15
The electromagnetic coil 15a is connected between the neutral point N of the stator coil of the alternator 14 and the ground terminal 15c, and the double-throw contact 15 is connected to the ground terminal 15c or the fixed terminal 15d connected to the DC power supply 10.
b. Therefore, the electromagnetic coil 15a
is in the demagnetized state, the double-throw contact 15b is connected to the ground terminal 15c and a low voltage L ₀ is applied from the output terminal L to the ground terminal 15c.
occurs. When the electromagnetic coil 15a is excited by the alternating voltage generated at the neutral point N of the stator coil, the double-throw contact 15b is connected to the fixed terminal 15d and generates a high voltage H _i from the output terminal L.

The microcomputer 20 includes a regulator relay 15, a speed sensor 16, and a set switch 1.
7, connected to the first clutch switch 18a, the second clutch switch 18b and the door switch 19. The speed sensor 16 includes a disc 16a made of a permanent magnet, and a reed switch 16 arranged to form a magnetic relationship with each protrusion of the disc 16a.
The disc 16a is attached to a speedometer drive cable 16c connected to the output shaft of the power transmission device of the vehicle. Therefore, the disc 16a is connected to the drive cable 16c.
When the reed switch 16b rotates in conjunction with the rotation, the reed switch 16b sequentially detects each protrusion on the disc 16a and generates a series of speed pulses corresponding to the actual traveling speed of the vehicle.

The set switch 17 is a normally open switch with a self-resetting function, and is provided at a suitable location in the vehicle interior of the vehicle. Thus, this set switch 17 generates a set signal by its temporary closure. First and second clutch switch 18a
and 18b are both provided on the clutch pedal of the vehicle, and the first clutch switch 18a
is of the normally open type and generates the first clutch signal when the clutch pedal is fully depressed. The second clutch switch 18b is of a normally closed type, and
When the clutch pedal is depressed, a second clutch signal is generated, and when the clutch pedal is released, the second clutch signal is extinguished. The door switch 19 is a normally closed switch, which is installed on the door of the vehicle, generates a door signal when the door is opened, and extinguishes this door signal when the door is closed.

The microcomputer 20 is formed by an LSI, and is activated in response to the constant voltage (5V) generated from the constant voltage circuit 21 by power supply from the DC power supply 10 when the ignition switch 13 is closed. Become. The microcomputer 20 includes a central processing unit (hereinafter referred to as CPU), an input/output device (hereinafter referred to as I/O), a read-only memory (hereinafter referred to as ROM), and a random access memory (hereinafter referred to as RAM). ) and a clock circuit are provided, and these CPU, I/O, ROM,
The RAM and clock circuits are connected to each other via a bus line. The I/O includes a low voltage L ₀ (or high voltage H _i ) from the regulator relay 15, each speed pulse from the speed sensor 16, a set signal from the set switch 17, the first and second clutch switches 18a, The first and second clutch signals from the door switch 18b and the door signal from the door switch 19 are received and applied to the RAM. The clock circuit is
It is connected to a crystal oscillator 22 and cooperates with the crystal oscillator 22 to generate a series of clock signals. The ROM stores in advance a main control program and an interrupt control program necessary for the CPU to execute the flowcharts shown in FIGS. 2 and 3, respectively.

The CPU has an interrupt timer, which starts measuring time at the same time as the microcomputer is started, and when its time value reaches 1 msec, it is reset and starts counting again. The CPU executes the main control program in response to a series of clock signals from the clock circuit, and stops executing the main control program every time the interrupt timer reaches 1 msec. By executing both control programs alternately, various calculation processes are performed as described below, and the drive signal (or drive stop signal) necessary to drive (or stop) the starter 11 is generated. and ignition coil 12c
generates the energization signal (or energization stop signal) necessary for energization (or de-energization) of the In this case, the execution of the main control program by the CPU is repeatedly completed within 10 msec after its start.

A starter relay 32 and an ignition relay 34 are connected to the microcomputer 20 via transistors 31 and 33, respectively. The transistor 31 has its base connected to the I/O of the microcomputer 20, and its emitter connected to the ignition switch 13.
When the ignition switch 13 is closed, it becomes conductive when it receives a drive signal from the CPU, and becomes non-conductive when it receives a drive stop signal from the CPU. The transistor 33 has its emitter grounded and its base connected to the I/O, becomes non-conductive upon receiving a energization signal from the CPU, and becomes conductive upon receiving a energization stop signal from the CPU.

The starter relay 32 includes an electromagnetic coil 32a and a normally open switch 32b.
a is grounded at one end and connected to the collector of the transistor 31 at the other end.
When the transistor 31 is turned on, it is excited by receiving power from the DC power supply 10, and is demagnetized in response to the non-conduction of the transistor 31. The normally open switch 32b of the starter relay 32 is connected between the DC power supply 10 and the starter 11, and closes in response to the excitation of the electromagnetic coil 32a, allowing power to be supplied from the DC power supply 10 to the starter 11. start. Further, the normally open switch 32b cuts off the power supply to the open starter 11 in response to the demagnetization of the electromagnetic coil 32a, thereby stopping the open starter 11. The ignition relay 34 consists of an electromagnetic coil 34a and a normally closed switch 34b.
The electromagnetic coil 34a is connected to the ignition switch 13
It is connected between the fixed terminal 13b of the transistor 33 and the collector of the transistor 33, and is demagnetized when the transistor 33 is non-conducting, and is excited by receiving power from the DC power supply 10 in response to the transistor 33 being conductive. When the electromagnetic coil 34a is in a demagnetized state, the normally closed switch 34b closes and disconnects the DC power source 1.
0 to allow power supply to the ignition coil 12c, and open in response to excitation of the electromagnetic coil 34a to cut off power supply to the ignition coil 12c.

In this embodiment configured as described above, when the ignition switch 13 is operated to connect the movable contact 13a to the fixed terminal 13b while the vehicle is stopped, the constant voltage circuit 21 Power is supplied from the power supply 10 to generate a constant voltage, and in response to this, the microcomputer 20 becomes operational. At the same time, the interrupt timer of the CPU starts counting time, and the CPU starts executing the main control program in step 40 according to the flowchart of FIG. Next, ignition switch 1
3 is operated to temporarily connect the movable contact 13a to the fixed terminal 13c, the starter 11 receives power from the DC power supply 10 and starts the engine in cooperation with the ignition circuit 12. At this time, the regulator relay 15 is connected to the alternator 1
4, a high voltage H _i is generated. In addition,
It is assumed that the reed switch 16b is closed due to the magnetic relationship with the disk 16a when the vehicle is stopped.

When the main control program proceeds to step 41 in this state, the CPU initializes the contents of the microcomputer 20, resets the flag _Fs , and sets the flag _F1 to the actual level of the speed pulse from the speed sensor 16 ( At this stage, since the reed switch 16b is closed, the speed pulse that should be generated from the reed switch 16b is at a low level.
In other words, it is assumed that it is 0. ), and the main control program advances to step 42, where it is determined whether the flag _Fs is in the reset state. In this case, the setting (or resetting) of the flag _Fs means the establishment (or failure) of the set condition for setting the engine under automatic start/stop control.
The set conditions are that the regulator relay 15 is generating a high voltage H _i , that the door signal from the door switch 19 has disappeared, and that the set switch 17 is generating a set signal. , is established when the above three requirements are satisfied simultaneously.

In this state, the CPU responds to the clock value from the interrupt timer, stops execution of the main control program, and steps the execution of the interrupt control program.
60 (see Figure 3), speed sensor 1
The velocity pulse from 6 (currently a low level signal) is stored in the RAM in the next step 61. When the interrupt control program proceeds to step 62, the CPU determines whether the storage pulse in step 61 is at a high level.
Therefore, the CPU determines "NO" and advances the interrupt control program to step 63, where it is determined whether the flag _F1 is set to a low level, that is, 0.

Then, the CPU determines "YES" based on the set level of flag _F1 in step 41 of the main control program, and in the next step 68, the CPU sets the RAM.
``1'' is added to the count value C by the counter, and this addition result is set as a new C, and the interrupt control program proceeds to step 69, where it is determined whether or not the count value C is 2 seconds or more. In this case, the RAM counter counts the time during which the level of the speed pulse stored in the RAM does not change in response to the clock signal from the clock circuit, and the RAM counter counts the added value "1" by the interrupt control program. This corresponds to the time required to execute (1 msec). However, since the count value C has not yet reached 2 seconds or more, the CPU determines "NO" in step 69,
At step 71, execution of the interrupt control program ends.

However, when the execution of the interrupt control program ends and the execution of the main control program starts, the CPU
However, in step 42, it is determined as ``YES'' based on the reset state of the flag _Fs in step 41, and the main control program proceeds to step 43, where it is determined whether or not the set condition is satisfied. At this stage, at least the set switch 17 is not operated, so the CPU determines "NO" in step 43,
The main control program advances to step 50, where it is determined whether the starter 11 is being driven.
Then, since the CPU has not yet generated a drive signal, the determination is "NO" and the main control program returns to step 42. Note that while the main control program described above is being executed, the CPU stops executing the main control program and executes the interrupt control program as described above every time the measured value of the interrupt timer reaches 1 msec. It's summery.

During the execution of each of these control programs, the door switch 19 responds to the closing of the door of the vehicle by extinguishing the door signal, and while the set switch 17 generates the set signal by its temporary operation, the main When the control program reaches step 43, the CPU generates the high voltage H _i from the regulator relay 15 and the set signal from the set switch 17, as well as the generation of the door switch 19.
Based on the disappearance of the door signal from the
At step 45, a flag _Fs is set, and at the next step 45 it is determined whether the engine is stopped.
Then, the CPU determines "NO" based on the high voltage H _i from the regulator relay 15, and then in step 55 determines whether the engine stop condition is satisfied. In this case, the conditions for stopping the engine are that the second clutch signal from the second clutch switch 18b disappears and that the RAM
This is established by the simultaneous fulfillment of two requirements: the count value C by the counter is 2 seconds (the time required for the vehicle to stop once the brake pedal is operated). However, at this stage
If the counted value C by the RAM counter is not greater than 2 seconds, the CPU determines "NO" in step 55 and returns the main control program to step 42.

As mentioned above, the main control program
Returning to step 42, the CPU determines "NO" based on the result of setting the flag _Fs in step 44, and proceeds to step 54, where it determines whether a cancellation condition for canceling the engine from automatic start/stop control is met. Proceed with the main control program. In this case, the cancel condition is satisfied by the requirement that the door signal is generated from the door switch 19 or the set signal is generated from the set switch 17 while the flag _Fs is set. Based on the fact that the door signal from the door switch 19 has disappeared and the set signal has not been generated from the set switch 17, the CPU determines "NO" in step 54, and steps the main control program.
45 and 55 and return to step 42.

In such a state, when the vehicle starts by operating its starting operation mechanism, the traveling speed of the vehicle is detected as a speed pulse by the speed sensor 16 and provided to the microcomputer 20 . At this stage, the CPU stops executing the main control program in response to the clock value from the interrupt timer and executes the interrupt control program in step 60.
(see Figure 3), the speed sensor 16
The velocity pulse from is stored in the RAM in the next step 61. When the interrupt control program proceeds to step 62, the CPU determines whether the speed pulse stored in step 61 is at a high level.

If the speed pulse stored in step 61 is at a high level, the CPU advances the interrupt control program to step 64, and determines whether the flag _F1 is at a high level, that is, 1. However, the CPU
is the flag in step 41 of the main control program.
Based on the level of F ₁ , it is determined as “NO” and the interrupt control program proceeds to step 66 to set the flag F ₁ =1.
and set. Interrupt control program starts at step 67
At step 71, the CPU resets the count value C of the counter provided in the RAM, and ends the interrupt control program at step 71. After the execution of the interrupt control program is finished, when the main control program proceeds to step 55, the CPU determines "NO" in relation to the reset result in step 67 of the interrupt control program, and causes the main control program to proceed to step 42. return.

Thereafter, when the execution of the main control program shifts to the execution of the interrupt control program in the same way as in the case described above, the speed pulse from the speed sensor 16 is stored in the RAM in step 61. If the speed pulse stored in this RAM is at a low level, that is, 0, the CPU determines "NO" in step 62, advances the interrupt control program to step 63, and checks if the flag F ₁ =0. It is determined whether or not.
Then, the CPU determines "NO" based on the set result F ₁ =1 in step 66, sets F ₁ =0 in step 65, resets the counted value C by the RAM counter in step 67, Terminates execution of the interrupt control program. Then, when the main control program reaches step 55, the CPU determines "NO" in the same way as in the case described above, and returns the main control program to step 42.

In this driving state of the vehicle, if the brake pedal is operated to temporarily stop the vehicle at an intersection, etc., step 65 (or 66) is executed.
Interrupt control program and steps through and 67
The car is decelerated while the CPU repeats each execution of the main control program through steps 42, 54, 45, and 55.
When the clutch pedal is depressed, the second clutch signal is generated from the second clutch switch 18b and stops, the speed pulse generated from the speed sensor 16 disappears, and then the second clutch signal is generated when the clutch pedal is released. disappears due to

Therefore, while the CPU is repeating the addition operation in step 68 of the interrupt control program, the determination as "NO" in step 69, and the determination as "NO" in step 55 of the main control program, the addition in step 68 is repeated. When the result reaches 2 seconds or more, the CPU determines "YES" in step 69, and sets the counted value C by the RAM counter to 2 seconds in step 70. Then, when the main control program proceeds to step 55, the CPU determines "YES" based on the disappearance of the second clutch signal from the second clutch switch 18b and the set result in step 70, and causes the main control program to proceed to step 56. Proceed to generate a energization stop signal. Then, the transistor 33 becomes conductive in response to the energization stop signal from the CPU, and the ignition relay 34 turns on the normally closed switch 3 by excitation of the electromagnetic coil 34a.
4b to stop power supply to the ignition coil 12c. This causes the engine to stop and the regulator relay 15 to generate a low voltage L ₀ .

Main control program passes through step 50
When the process returns to step 42 and reaches step 45, the CPU determines "YES" based on the low voltage _L0 from the regulator relay 15, and the main control program is passed to step 45, which determines whether the starter 11 is stopped. Proceed to 46. Then, the CPU determines "YES" because no drive signal has been generated yet.
In the next step 47, it is determined whether the engine starting conditions are satisfied. In this case, the engine starting condition is based on the simultaneous satisfaction of two requirements: that the regulator relay 15 is generating a low voltage _L0 , and that the first clutch switch 18a is generating the first clutch signal. To establish. Then, based on the disappearance of the first clutch signal, the CPU determines "NO" in step 47, and returns the main control program to step 42 through step 50.

When the vehicle and engine are temporarily stopped, the clutch pedal is operated to set the first clutch signal to the first clutch signal in order to start the vehicle again.
If it is generated from the clutch switch 18a, the CPU determines "YES" when the main control program advances to step 47, and in the next step 48 determines that the drive delay time D=0 of the starter 11. Then, the CPU determines "YES" in relation to the initialization in step 41, and advances the main control program to step 49a to generate a drive signal. Then, the transistor 31 becomes conductive in response to the drive signal from the CPU, and the starter relay 32 turns on the normally open switch 32 due to the excitation of the electromagnetic coil 32a.
b is closed, and the starter 11 is driven by the energization to start the engine. At this time, the regulator relay 15 generates a high voltage H _i under the control of the alternator 14 due to engine startup.

When the main control program advances to step 50,
The CPU determines "YES" based on the drive signal (stored in the input port of the I/O) generated in step 49a, and determines whether the stop condition for the starter 11 is satisfied in the next step 51. Determine whether In this case, the condition for stopping the starter 11 is established by satisfying the requirement that the regulator relay 15 generates a high voltage H _i .
Then, the CPU determines "YES" in step 51 based on the high voltage H _i from the regulator relay 15, advances the main control program to step 52, sets the drive delay time D to 0.5 sec, and then steps
A drive stop signal is generated at 53. As a result, the transistor 31 becomes non-conductive, opening the normally open switch 32b of the starter relay 32 and starting the starter 11.
Cut off electricity to the In addition, in this embodiment, the drive delay time D=0.5 sec is
means the time required for the motor to stop after the current is cut off.

By the way, if the engine suddenly stops for some reason immediately after the power supply to the starter 11 is cut off as described above, the driving vehicle generates a first clutch signal from the first clutch switch 18a by depressing the accelerator pedal. At this time, the regulator relay 15 generates a low voltage L ₀ due to the sudden decrease in engine speed, while the starter 11
The rotation speed of is in a state of gradual decline. When the main control program proceeds to step 47, the CPU determines "YES" as in the case described above, and in the next step 48, determines "NO" based on the set result in step 52. The main control program proceeds to step 49b, where 10 msec is subtracted from the result set in step 52, and this subtraction result is newly set as the drive delay time D. Thereafter, the main control program passes through step 50 and returns to step 42. Therefore, when the subtraction result D becomes zero while repeating the determination as "NO" in step 48 and the subtraction in step 49b, the CPU determines as "YES" in step 48 and proceeds to step 49a. to generate a drive signal. Then, the starter 11 is driven under the control of the transistor 31 and the starter relay 32 in response to a drive signal from the CPU to start the engine.

As can be understood from the above explanation, if the engine suddenly stops immediately after power is cut off to the starter 11 when the engine starts, the driver depresses the clutch pedal to output the first clutch signal from the first clutch switch 18a. Even if the starter 1
1 remains cut off, and the drive delay time D
When = 0.5 sec has elapsed, that is, when the rotational speed of the starter 11 becomes approximately zero, the starter 11 is driven by the re-energization and restarts the engine. In other words, when the difference in rotational speed between the engine and the starter 11 is almost eliminated after the drive delay time D = 0.5 sec has elapsed, the starter 11 is driven by re-energization. The pinion meshes smoothly with the ring gear provided on the flywheel of the engine, and as a result, noise such as gear noise and damage such as wear are prevented from occurring at the connecting portion between the starter 11 and the engine, such as the pinion or ring gear. In this state, the engine rises at that rotational speed as the rotational speed of the starter 11 increases, and its starting is completed smoothly. In this case, since the timing of automatic re-energization of the starter 11 always coincides with the stop timing of the starter 11, smooth restart of the engine after the above-mentioned sudden stop of the engine can be quickly achieved. Thereafter, the starter 11 stops in the same manner as in the case described above, and the vehicle starts when the start operation mechanism is operated.

Furthermore, when the door of the vehicle is opened while the vehicle and engine are temporarily stopped, the door switch 19 generates a door signal. However, the main control program may not be able to step in such a state.
When proceeding to step 54, the CPU determines "YES" based on the generation of the door signal, and steps the main control program.
Proceed to step 57 and reset the flag _Fs . After that,
The CPU generates a drive stop signal in step 58,
Then, in step 59, an energization signal is generated. As a result, the transistor 31 becomes non-conductive in response to the drive stop signal, maintains the normally open switch 32b of the starter relay 32 in an open state, and disables automatic drive of the starter 11, and the transistor 33 responds to the energization signal. The normally closed switch 34b of the ignition relay 34 is maintained in the closed state, and the ignition coil 12c is enabled to be energized. Note that in a state where the automatic engine start/stop control is canceled in this way, the engine will not start unless the ignition switch 13 is operated.

In the above embodiment, the set value of the drive delay time D in step 52 is 0.5 seconds, but the present invention is not limited to this, and the drive delay time D can be set to, for example, 0.5 seconds.
It may also be implemented by setting it to 1 sec.

Further, in the above embodiment, in determining whether the engine starting condition is met in step 47, generation of the low voltage _L0 from the regulator relay 15 and generation of the first clutch signal from the first clutch switch 18a are performed. Although we have explained the example as a requirement, instead of this, the ignition coil 12c
Generation of spark voltage from the first clutch switch 1
The generation of the first clutch signal from 8a and the fact that the engine speed is 50 r.p.m. or less may be used as the conditions for determining whether the engine starting conditions are met.

Further, in the above embodiment, an example in which the present invention is applied to an automobile gasoline engine has been described, but the present invention is not limited to this, and the present invention can also be applied to an automobile diesel engine. However,
In this case, in place of the ignition circuit 12, a fuel injection amount control circuit for controlling the amount of fuel injected into the diesel engine is adopted, and this fuel injection amount control circuit is connected to the normally closed switch 34b of the ignition relay 34. What is necessary is to stop fuel injection when the valve is opened.

Further, in the above embodiment, an example was explained in which the engine is automatically stopped when the vehicle is stopped, but instead of this, for example, a one-touch manual operation switch may be adopted to detect this when the vehicle is stopped. At the same time, the engine may be stopped by manually operating the one-touch manual operation switch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are flowcharts showing the operation of the microcomputer shown in FIG. 1, respectively. Explanation of symbols 11... Starter, 12... Ignition circuit, 13... Ignition switch, 16... Speed sensor, 17... Set switch, 18a... First clutch switch, 18b...
...Second clutch switch, 20...Microcomputer, 31, 33...Transistor, 32...
...Starter relay, 34...Ignition relay.

Claims (1)

[Claims] 1. When starting an automobile, in response to the operation of the starting operation mechanism, a starter circuit provided in the automobile engine is automatically energized, and an ignition circuit or a fuel injection amount control circuit provided in the engine is automatically energized. Start the engine, detect when the engine starts and cut off power to the starter circuit, and after the car starts, detect that the car is in a running state and based on the detection result. Automatic starting of the engine, wherein the ignition circuit or the fuel injection amount control circuit is kept energized, and when the vehicle stops, the ignition circuit or the fuel injection amount control circuit is cut off and the engine is stopped. In the stopping method, when the power supply to the starter circuit is cut off, the time required for the mechanical rotation system provided in the starter circuit to stop after the power supply to the starter circuit is cut off is set, and the time required for stopping the power supply to the starter circuit is set. When the engine stops immediately after the engine is shut off, in response to the re-operation of the start operation mechanism, the timing of the required time is started, and automatic re-energization of the starter circuit is prohibited, and the timing of the required time is ended. 1. A method for automatically starting and stopping an automobile engine, characterized in that when the engine is restarted, the engine is restarted by allowing automatic re-energization of the starter circuit.