JPH0833115B2 - Throttle opening control device for in-vehicle internal combustion engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a throttle opening control device for a vehicle-mounted internal combustion engine, and more specifically, a pulse motor is connected to a throttle valve, and the throttle valve is connected via the pulse motor. The present invention relates to a throttle opening control device for an on-vehicle internal combustion engine that controls opening and closing of a vehicle.

(Prior Art) It is well known to connect a pulse motor to a throttle valve arranged in an intake passage of an internal combustion engine and control the opening and closing thereof according to the operating state of the engine. The technique described in Japanese Patent Publication No. Sho 61-19946 can be mentioned.
In this conventional technique, a command pulse to the pulse motor is calculated and output according to the operating state of the engine, and the throttle valve is controlled to the target opening.

(Problems to be Solved by the Invention) When the opening / closing of the throttle valve is driven by a pulse motor, a spring is attached to the throttle valve to urge it in the closing direction, and the driving force of the motor acts. It is configured to forcibly return to the idle position when it stops.
Therefore, when a command value that exceeds the fully open position of the throttle valve is output, the pulse motor loses step due to the characteristic when the throttle valve hits the stopper, the torque becomes zero, and the throttle valve suddenly opens at the fully closed position. Therefore, there is a disadvantage that the engine output sharply decreases as a result. Also, when controlling the valve closing direction, there is no problem of such spring biasing force, but when outputting a command value exceeding the fully closed position, a command value not involved in the operation of the throttle valve is output. There was dissatisfaction in terms of responsiveness and followability.

Furthermore, when controlling the opening and closing of the throttle valve via a pulse motor, the motor command value is output according to the target value, the current opening, and the deviation, but in that case, the target value can be changed only slightly. There may be a case where the rotation direction is frequently reversed. Therefore, in such a case, if the pulse motor is output as it is, the throttle opening is accordingly changed and the intake air amount is changed, and hunting occurs in the engine output, so that stable control cannot be expected.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks, and a limit is set for the command value output to the pulse motor so as not to exceed the movement limit of the throttle valve, thus preventing a sudden decrease in the engine output and controlling. It is an object of the present invention to provide a throttle opening control device for an internal combustion engine mounted on a vehicle, which achieves stability and restrains unnecessary output to improve control responsiveness and normality.

Further, an object of the present invention is to provide a throttle opening control device for an on-vehicle internal combustion engine, which prevents hunting of the engine output by providing a dead zone in the command value output to the pulse motor, and thus improves control stability. It is in.

(Means and Actions for Solving the Problems) In order to solve the above problems, the present invention is, as shown in FIG. 1, an accelerator pedal depression amount for detecting an accelerator pedal depression amount arranged on the floor surface of a vehicle driver's seat. Target throttle of a throttle valve provided in an engine intake passage by inputting the outputs of the detecting means 1, the engine operating state detecting means 2 for detecting the operating state of the engine, the engine operating state detecting means and the accelerator pedal depression amount detecting means. Target throttle opening setting means 3 for setting the opening, motor command value calculating means 4 for inputting the output of the target throttle opening setting means to calculate a command value to a pulse motor for driving the throttle valve, the motor command It comprises a pulse motor 5 that rotates by receiving the output of the value calculation means, and a throttle valve 6 that is connected to the pulse motor and that opens and closes the engine intake passage according to the rotation. In the on-vehicle internal combustion engine throttle opening control device, the motor command value computing means obtains a current opening of the throttle valve and obtains a deviation between the obtained current opening and the target throttle opening. A means for calculating a command value to the pulse motor, a command limit value based on a deviation between the physical opening limit value of the throttle valve and the current opening, and the command limit value and the command value. And means for setting the smaller value as the command value to the pulse motor.

Further, an accelerator pedal depression amount detecting means 1 for detecting the depression amount of an accelerator pedal arranged on the floor of the vehicle driver's seat, an engine operating state detecting means 2 for detecting an engine operating state, the engine operating state detecting means and the above Throttle opening setting means 3 for inputting the output of the accelerator pedal depression amount detecting means to set the opening of the throttle valve provided in the engine intake passage, and driving the throttle valve by inputting the output of the throttle opening setting means A motor command value calculating means 4 for calculating a command value to the pulse motor at predetermined time intervals, a pulse motor 5 for inputting the output of the motor command value calculating means to rotate, and a rotation of the pulse motor connected to the pulse motor. In the throttle opening control device for a vehicle-mounted internal combustion engine, which comprises a throttle valve 6 that opens and closes an engine intake passage in accordance with When the polarity of the value is reversed and the magnitude is less than the predetermined value, the command value is added to the command value to be calculated next time, and the command value calculated last time is output as it is until the sum becomes equal to or more than the predetermined value. Configured as

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
FIG. 2 is an overall schematic view of a throttle opening control device for an on-vehicle internal combustion engine according to the present invention. When the description is made with reference to FIG. 2, reference numeral 10 indicates the internal combustion engine. Internal combustion engine 10 is an intake passage
12 equipped with an air cleaner attached to the tip side
The intake air introduced through 14 is the throttle valve 6 described above.
While adjusting the flow rate by the intake manifold 18, the fuel is supplied through the fuel injection valve 20, and the intake valve
It flows into the combustion chamber 24 through an intake port opened and closed by 22.
The air-fuel mixture that has flowed in is ignited by a spark plug (not shown) and burns, drives the piston 26, and then passes through an exhaust port that is opened and closed by an exhaust valve 28, and then an exhaust manifold.
It enters 30 and is discharged to the outside of the engine through an exhaust pipe (not shown).

Further, an accelerator pedal 32 is arranged on the floor surface of a driver's cab of a vehicle in which the internal combustion engine is mounted, and the pedal is urged to an idle position by a spring (not shown), and in response to a driver's stepping action. Rotate. As shown,
The mechanical connection between the accelerator pedal and the throttle valve 6 is cut off, and instead, the pulse motor 5 is provided near the throttle valve. The pulse motor is
It is connected to the valve shaft 6a of the throttle valve via a clutch mechanism and a reduction gear mechanism (not shown) to open and close the valve.
A return spring (not shown) is provided on the throttle valve shaft 6a to constantly urge the throttle valve in the fully closing direction. The opening of the throttle valve is detected by the throttle sensor 40 including a potentiometer and the like.

Furthermore, at an appropriate position downstream of the throttle valve of the intake passage 12,
An intake pressure sensor 42 that detects the pressure of the intake air as an absolute pressure is provided, and an intake temperature sensor 44 that detects the temperature of the intake air is provided further downstream thereof, and at an appropriate position upstream of the throttle valve. Is an atmospheric pressure sensor that detects atmospheric pressure
46 is provided. Further, an accelerator sensor 48, which is the above-mentioned accelerator pedal depression amount detection means for detecting the depression amount (accelerator opening degree) of the accelerator pedal, is provided near the accelerator pedal, and a water temperature for detecting the cooling water temperature is provided at an appropriate position near the combustion chamber. A sensor 50 is provided, and a crank angle sensor 52 for detecting the crank angle of the engine is provided at an appropriate position in a distributor (not shown) or the like, while the vehicle travels at an appropriate position of a transmission (not shown). A vehicle speed sensor 54 for detecting the speed is provided. The outputs of these sensors are sent to the control unit 58.

Further, in this control device, an ACG sensor 60 for detecting a field current of an alternator (not shown), a power steering switch 62 for detecting activation / deactivation of a power steering (not shown), and an air conditioner (not shown). ) Of the air conditioner switch 64 for detecting the operation / non-operation of the starter, a starter switch 66 for detecting the operation / non-operation of a starter (not shown), a battery voltage sensor 68 for detecting the voltage of a battery (not shown), a shift lever ( A range selector switch 70 for detecting a range position (not shown) and a shift position switch 72 for detecting a shift position (gear stage) (for example, detection by referring to a solenoid excitation signal of a mission control unit) are provided for control. The output is sent to the unit and the brake switch 74, main switch 76, and sec G Switch 78 and resume switch 80 is also provided.

FIG. 3 shows the details of the control unit 58. In this unit, the analog output of the throttle sensor 40 or the like is input to a level conversion circuit 88, where it is converted to an appropriate level and then input to a microcomputer 90, A / D
It is converted into a digital value by the conversion circuit 90a and temporarily stored in the RAM 90e. Further, the digital outputs of the crank angle sensor 52 and the like are waveform-shaped by the waveform shaping circuit 92 and input into the microcomputer through the input port 90b. micro·
In the computer, the CPU90c can read the ROM9
A control value is calculated as described later according to the program stored in 0d and sent to the output circuit 94 through the output port 90f, and the pulse motor 5 is driven through the drive circuit 96 including a transistor and the like. 6 is controlled to open and close. In the above configuration, the crank angle sensor 52 and the like excluding the accelerator sensor 48 correspond to the engine operating state detecting means, and the microcomputer 90 corresponds to the throttle opening setting means and the motor command value calculating means.

Next, the operation of the present control device will be described with reference to the flow chart of FIG. Note that this program is repeated in a loop for a predetermined time, for example, every 10 ms.

First, in S10, the previously calculated command value θCMDn−1 is output. This command value is indicated by the number of pulses (displacement amount). As shown in FIG. 5, in the present control method, the calculation cycle is set to a relatively short time interval of 10 ms, and the calculated command value is not immediately output, but stored once and stored in the next cycle. Output at the beginning.

Then, in S12, the engine speed Ne and the accelerator opening θA
Control parameters such as P are sequentially read and stored in the RAM 90e, and in S14, the reference opening θTHM of the throttle valve is searched from the accelerator opening θAP and the engine speed Ne by referring to the map stored in the ROM 90d.

Subsequently, in S16, it is determined whether or not it is in the idle control range. This is judged from the starter switch signal, range selector signal, vehicle speed, intake pressure, throttle opening, engine speed, etc., especially when the engine speed is below the appropriately set deceleration speed and above the idle determination speed. It is determined that the engine is in the idle control range, and the process proceeds to S18 to appropriately determine the throttle opening θidle for idle control.

If it is determined in S16 that the engine is not in the idle control range, the process proceeds to S20, and the predetermined opening θidle-ref is set as the idle opening. This predetermined opening is, for example, 10 degrees (however, WOT = 84 degrees) which is the upper limit opening in the idle control range.

Then, in S22, it is determined whether or not it is in the automatic cruise control range. This is judged from the output signals of the brake switch 74, the auto cruise main switch 76, etc. described above. If it is determined that the vehicle is in the automatic cruise control range, the program proceeds to S24 to appropriately calculate the automatic cruise opening θcru to maintain the set vehicle speed, and if not, set the automatic cruise opening to zero in S26. To do.

Then, in S28, the target opening θTHO is calculated. This is performed by selecting the maximum value from the opening calculated up to that point, that is, the reference opening θTHM, the idle opening θidl, and the auto-cruise opening θcru. By taking the maximum value,
For example, even when an operating state in which the idle control range and the automatic cruise control range overlap each other occurs, it is possible to optimally control the throttle opening that makes both controls compatible.
Since the selected maximum value is indicated by the opening, divide it by a predetermined number (opening per pulse) in this step,
Convert to pulse number.

Subsequently, in S30, the target value θTHOn-1 calculated last time is calculated.
And the deviation ΔθTHO calculated from the target value θTHOn calculated this time, the polarity of the deviation is determined in S32, that is, it is determined whether the motor rotation direction is reversed, and if it is determined that it is reversed, the deviation is subsequently determined in S34. It is determined whether or not the absolute value (regardless of the rotation direction) is smaller than an appropriately set n step angle, for example, 1 step angle. Here, the reason why the angle is smaller than the one-step angle is judged because a fractional part after the decimal point may occur in the above-mentioned opening-pulse conversion. When it is determined that the difference is small, the deviation ΔθTHO is temporarily stored in S36. Specifically, the current store value ΔθTHOSn-1 that was already stored is added with the current deviation to obtain the latest store value ΔθTHOSn. Then, in S38, the target throttle opening value θTHOn
Keeps the previous target value θTHOn-1 and keeps the target value unchanged. As described above, when the change of the target value is slight and the rotation direction changes frequently, a dead zone is provided so that the output is not performed. In this case, if the angle is less than 1 step angle, the pulse motor characteristic is not output. However, it is particularly beneficial when n is set to 2 to 3 step angles.
If it is determined in S32 that the polarity of the deviation is not reversed, or if it is determined in S34 that the deviation (absolute value) is larger than the set step angle n, the process proceeds to S40 and is stored in the target value θTHOn. The existing value ΔθTHOSn is added (when there is a store value) to obtain the current target value, and the store value is reset to zero for the next calculation in S42.

Then, in S44, the previous throttle opening θTHPn−
Previous command value θCMDn output in S10 for 1 (pulse absolute value)
-1 is added to calculate the current opening, more accurately, the throttle opening θTHPn currently being moved. Subsequently, in S46, the deviation between the current opening degree and the target value is calculated to determine the current motor command value θCMDn (pulse displacement amount).

Subsequently, in S48, it is determined whether or not the absolute value of the command value this time exceeds the upper limit value θMAX (pulse number), and if it exceeds, the control value is limited to the upper limit value in accordance with the rotation direction (S50,
52, 54). This upper limit value θMAX means an upper limit value at which output can be completed within the calculation cycle of 10 ms. That is, if the command pulse is continuously output for two or more cycles, the current opening cannot be calculated accurately in S44.
The limit is set like this. In this flowchart, the valve opening direction is a positive value and the valve closing direction is a negative value.

Then, in S56, the limit check is performed again for the command value. This is for determining whether or not the throttle valve can move as instructed as described above. Specifically, the rotation direction is determined in S56, and if it is determined that the valve is in the valve opening direction, then the control value is determined so that the throttle valve can move according to the command value calculated in S58. That is, the value obtained by subtracting the current opening θTHPn from the upper limit opening θTHMAX (pulse absolute value) corresponding to the maximum opening (WOT) at which the throttle valve can be physically opened is the movable range. The value is compared with the operation command value and the smaller value is selected. This is because, as described above, the throttle valve is attached to the valve shaft 6a by a spring and is urged in the fully closing direction.Therefore, when the pulse motor is given a command value of fully open or more, the throttle valve strikes the stopper. This is to avoid the inconvenience that the pulse motor is stepped out due to the characteristic at the time of hitting and is immediately returned to the fully closed position by the spring force so that the engine output sharply decreases. When the command value is the value in the valve closing direction, the current opening is a positive value calculated with the fully closed position as zero, so simply compare the control value (absolute value) with the current opening. It is possible to limit the command value to the movable range only by selecting the smaller one (S60). In this case, there is no problem with the biasing force of the spring in the valve closing direction, but with such a configuration, it is possible to limit the output of pulses that are not involved in the operation of the throttle valve, and improve the calculation speed and control response. To do. As described above, the command value calculated in this way is stored in the RAM without being output at the time when the calculation is completed and is output at S10 when the program is started next time.

As described above, in the present embodiment, the motor command value is limited within the movable range of the throttle valve, so that the throttle valve is forcibly returned by the return spring.
Alternatively, an unnecessary command value is not output in the fully closed direction, excellent responsiveness and followability can be achieved, and stable control can be realized. Further, when the change of the target value is small and the polarity is frequently inverted, the control value is not changed, and thus the control characteristics can be similarly stabilized.

Although the present invention has been described with respect to a mechanism in which the mechanical connection between the accelerator pedal and the throttle valve is completely disconnected, the present invention additionally provides a pulse motor while leaving the mechanical connection such as the accelerator wire. It goes without saying that what is provided is also appropriate.

(Advantages of the Invention) In the throttle opening control device for an on-vehicle internal combustion engine according to claim 1, the motor command value calculation means is means for obtaining the current opening degree of the throttle valve, the obtained current opening degree and the current opening degree. Means for calculating a command value to the pulse motor by obtaining a deviation from a target throttle opening, and a command limit value based on a deviation between a movement limit value at which the throttle valve can be physically opened and the current opening. The throttle valve is used for controlling the valve opening direction because it is configured so as to obtain the command limit value and the command value and compare the command value with the command value to the pulse motor. There is no inconvenience such as forcibly returning via the return spring, and command values that are not involved in the valve closing operation can be omitted even in the control in the valve closing direction, providing excellent control stability and responsiveness and follow-up. It also has the advantage of improving subordination.

Further, in the on-vehicle internal combustion engine throttle opening degree control device according to claim 2, when the polarity of the command value calculated this time is reversed and the magnitude thereof is less than the predetermined value. Is configured to add the command value to the command value to be calculated next time and output the command value calculated last time as it is until the sum becomes equal to or more than the predetermined value. Therefore, the throttle opening is fluctuated and the intake air amount is changed. Therefore, there is an advantage that stable control can be realized without causing inconvenience such as causing hunting in the engine output by changing.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of a throttle opening control device for an on-vehicle internal combustion engine according to the present invention, FIG. 2 is a schematic diagram showing the control device as a whole, and FIG. 3 shows details of a control unit therein. A block diagram, FIG. 4 is a flow chart showing the operation of the control device, and FIG. 5 is a timing chart showing the operation of the control device. 1. Accelerator pedal depression amount detecting means (accelerator sensor
48), 2 ... Engine operating state detecting means (crank angle sensor)
52 etc.), 3 ... Throttle opening setting means (micro computer 90), 4 ... Motor command value calculation means (micro computer 90), 5 ... Pulse motor, 6 ... Throttle valve, 10 ... Internal combustion Engine, 12 ... Intake passage, 32 ... Accelerator pedal, 40 ... Throttle sensor, 42 ... Intake pressure sensor, 44 ... Intake temperature sensor, 46 ... Atmospheric pressure sensor, 48
...... Accelerator sensor, 50 …… Water temperature sensor, 52 …… Crank angle sensor, 54 …… Vehicle speed sensor, 58 …… Control unit,
60 …… ACG sensor, 62 …… Power steering switch, 64 …… Air conditioner switch, 66 …… Starter switch, 68 …… Battery voltage sensor, 70 …… Range selector switch, 72…
… Shift position switch, 74 …… Brake switch, 76 …… AC main switch, 78 …… AC set switch, 80 …… AC resume switch, 90 …… Microcomputer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuji Kawaguchi 1-4-1 Chuo, Wako-shi, Saitama, Honda R & D Co., Ltd. (56) Reference JP-A-55-160132 (JP, A)

Claims (2)

[Claims] Claims: 1. a. Accelerator pedal depression amount detecting means for detecting the depression amount of an accelerator pedal arranged on the floor of the vehicle driver's seat; b. Engine operating state detecting means for detecting the operating state of the engine; c. The engine Target throttle opening setting means for setting the target throttle opening of the throttle valve provided in the engine intake passage by inputting the outputs of the operating condition detecting means and the accelerator pedal depression amount detecting means, d. Setting the target throttle opening A motor command value computing means for computing the command value to the pulse motor for driving the throttle valve by inputting the output of the means, e. A pulse motor rotating by receiving the output of the motor command value computing means, and f. In a throttle opening control device for a vehicle-mounted internal combustion engine, which comprises a throttle valve that is connected to a pulse motor and that opens and closes an engine intake passage according to its rotation, the motor command value calculation means includes g. Means for obtaining the current opening of the throttle valve, h. Means for obtaining a deviation between the obtained current opening and the target throttle opening, and calculating a command value to the pulse motor, i. Physical of the throttle valve The command limit value based on the deviation between the movement limit value that can be valve opened and the present opening degree, the command limit value is compared with the command value, and the smaller value is the command value to the pulse motor. A throttle opening control device for a vehicle-mounted internal combustion engine, comprising: 2. An accelerator pedal depression amount detecting means for detecting an depression amount of an accelerator pedal arranged on a floor of a vehicle driver's seat, b. An engine operating state detecting means for detecting an operating state of an engine, and c. The engine. Throttle opening setting means for inputting the outputs of the operating state detecting means and the accelerator pedal depression amount detecting means to set the opening of the throttle valve provided in the engine intake passage, d. A motor command value computing means for computing a command value to the pulse motor for driving the throttle valve at predetermined time intervals, e. A pulse motor which rotates by receiving the output of the motor command value computing means, and f. In a throttle opening control device for a vehicle-mounted internal combustion engine, which comprises a throttle valve that is connected to a pulse motor and that opens and closes the engine intake passage according to the rotation of the pulse motor, the motor command value calculation means calculates this time. When the polarity of the command value is reversed and the magnitude is less than the predetermined value, the command value is added to the command value to be calculated next time, and the command value calculated last time is kept as it is until the sum exceeds the predetermined value. A throttle opening control device for a vehicle-mounted internal combustion engine, which is characterized by outputting.