JP6553496B2 - Electronically controlled throttle device and throttle control method - Google Patents

Description

  The present invention relates to an electronic control throttle device and a throttle control method of an engine in an engine intake air amount control device that adjusts the output of an engine such as a car.

  In recent years, in the control of an internal combustion engine (engine) such as a car, an actuator for opening and closing the throttle valve, a return spring for urging the throttle valve in the closing direction to the default opening, and a throttle valve in the opening direction for the default opening 2. Description of the Related Art An electronically controlled throttle device that has an opener spring that urges and controls the drive of an actuator to feedback-control the opening of a throttle valve to a target opening is widely used.

  As an apparatus for diagnosing such abnormality of the electronically controlled throttle device, one disclosed in Patent Document 1 can be cited.

  Patent Document 1 relates to an engine throttle valve control device and control method, and in particular, after the throttle valve is opened to a diagnosis opening degree while the engine is stopped, the electric control by the electric control means is stopped, and then the throttle is controlled. A configuration for diagnosing a return spring failure by detecting the return state of the valve is proposed.

Unexamined-Japanese-Patent No. 11-190230

  When an abnormality in feedback control of the electronically controlled throttle device is detected, both the actuator power shut-off device and the return spring must operate normally in order to obtain a safe default opening.

  Since these can not be diagnosed during the operation of the internal combustion engine, as described in Patent Document 1, the diagnosis is performed with the engine stopped.

  For this reason, if the abnormality diagnosis can be performed immediately before the start of the engine, for example, at the same time as the engine key is turned on and immediately before the start of the engine, the reliability of the engine control can be further improved.

  Although it is necessary to diagnose both the power shutoff device of the actuator and the return spring for abnormality diagnosis, when making a diagnosis before starting the engine which is an internal combustion engine, the startability of the internal combustion engine is not adversely affected. There is a need to perform an early diagnosis.

  However, in the prior art, it is effective to execute both the diagnosis of the power shutoff device of the actuator and the diagnosis of the return spring at an early stage immediately before the start of engine start without adversely affecting the startability of the internal combustion engine. Was not considered.

  It is an object of the present invention to provide an electronically controlled throttle device and a throttle that perform both the power shutoff device of the actuator and the diagnosis of the return spring at an early stage immediately before the start of engine start without adversely affecting the startability of the internal combustion engine. It is to realize the control method.

  In order to achieve the above object, the present invention is configured as follows.

(1) A throttle control unit that electrically controls a throttle valve that regulates intake air of an internal combustion engine, a power shutoff unit that shuts off power to the throttle control unit, and a mechanical opening of the throttle valve up to the default opening degree The throttle valve is opened up to the first target throttle valve opening on the open side by the throttle control unit by the closing throttle valve return mechanism and the throttle control unit, and the throttle valve becomes the first target throttle valve within the first time. The power supply shut-off unit shuts off the power supply when the valve has been opened to monitor the return state of the throttle valve by the throttle valve return mechanism, and the throttle valve return mechanism and the power shut-off unit are normal. In the electronically controlled throttle device, the engine control unit determines whether the throttle valve has been opened to the first target throttle valve opening within the first time period. But If the throttle valve is closed to the default opening within the second time, it is determined that the power shutoff unit and the throttle valve return mechanism are normal, and the throttle valve is within the first time. When the power is shut off with the first target throttle valve opening degree open, and the throttle valve does not close to the default opening degree within the second time, the throttle control unit performs the first throttle valve control operation. The target throttle valve opening degree is controlled so as to open up to the second target throttle valve opening degree on the opening side from the default opening degree, and the throttle valve is controlled to the second target throttle valve opening degree within the third time. If it converges, it is determined that the power shutoff unit is abnormal, and if the throttle valve does not converge to the second target throttle valve opening within the third time, the power shutoff unit is normal and the throttle valve return mechanism is determined to be abnormal

(2) In a throttle control method for controlling a throttle valve for adjusting intake air of an internal combustion engine, the throttle valve is mechanically closed to a default opening degree by a throttle valve return mechanism, and the throttle valve drives the throttle valve open. The control unit opens the throttle valve to the first target throttle valve opening on the opening side of the default opening degree, and shuts off the power to the throttle control unit in a state where the throttle valve is opened within the first time. Monitors the return state of the throttle valve by the throttle valve return mechanism which shuts off the power supply by the power shutoff unit and drives the throttle valve to close, and whether the throttle valve return mechanism and the power shutoff unit are normal or not in throttle control method determines whether, the said throttle valve within the first hour is interrupted power is in a state in which it became the open to the first target throttle valve opening degree, the throttle valve within the second hour the differential If the power supply shut-off portion and the throttle valve return mechanism are normal when the valve is closed to the opening degree, the throttle valve is opened to the first target throttle valve opening within the first time When the power is shut off and the throttle valve does not close to the default opening within the second time, the throttle control unit opens the throttle valve from the default opening different from the first target throttle valve opening. Control to open up to the second target throttle valve opening on the side, and if the throttle valve converges to the second target throttle valve opening within the third time, it is determined that the power shutoff portion is abnormal If it is determined that the throttle valve does not converge to the second target throttle valve opening within the third time, it is determined that the power shutoff unit is normal and the throttle valve return mechanism is abnormal .

  According to the present invention, the electronic control throttle device and the throttle that perform both the power shutoff device of the actuator and the diagnosis of the return spring immediately before the start of the engine start without adversely affecting the startability of the internal combustion engine A control method can be realized.

1 is a basic configuration diagram of a spark ignition internal combustion engine and a control device thereof according to an embodiment of the present invention. The internal structure of the engine control unit 9 is shown. It is the figure which showed the outline of the electronically controlled throttle apparatus in one Example of this invention. It is an operation | movement flowchart of the throttle valve control apparatus which is one Example of this invention. It is an operation | movement flowchart of the throttle valve control apparatus which is one Example of this invention. It is a time chart in case both a throttle power supply relay and a return spring operate | move normally. It is a time chart when the throttle power supply relay is normal and the return spring is abnormal. It is a time chart when the throttle power supply relay is abnormal and the return spring is normal. It is a time chart when the throttle power supply relay and the return spring are both abnormal.

  Embodiments of the invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a basic configuration diagram of a spark ignition internal combustion engine and its control device according to an embodiment of the present invention. In the following description, although the description will be made using a direct injection spark ignition internal combustion engine in the following description, a port injection spark ignition internal combustion engine or a dual injection spark ignition internal combustion engine provided with both direct injection and port injection Is also applicable.

  In FIG. 1, an engine 1 is provided with a piston 2, an intake valve 3, and an exhaust valve 4, and intake air passes through an air flow meter (AFM) 18 and enters a throttle valve of an electronically controlled throttle device 17, and branches. Is supplied to the combustion chamber 19 of the engine 1 through the intake pipe 10 and the intake valve 3. Fuel is injected and supplied from the fuel injection valve 5 to the combustion chamber 19 of the engine 1 and ignited by the ignition coil 7 and the ignition plug 6.

  The exhaust gas after combustion is discharged to the exhaust pipe 11 through the exhaust valve 4, and the exhaust pipe 11 is provided with a three-way catalyst 12 for purifying the exhaust gas. The engine control unit (engine control unit (ECU)) 9 includes a signal from the crank angle sensor 15 of the engine 1, an air amount signal from the AFM 18, a signal from the air-fuel ratio sensor 13 for detecting the air-fuel ratio in the exhaust gas, and the accelerator opening. A signal such as the accelerator opening of the sensor 20 is input. Reference numeral 16 denotes a flywheel.

  The engine control unit 9 calculates the required torque to the engine from the signal of the accelerator opening sensor 20, determines the idling state, etc., calculates the intake air amount necessary for the engine 1, and electronically controls the opening signal corresponding to it. Output to the throttle device 17.

  A fuel injection signal is output to the fuel injection valve 5 and an ignition signal is output to the spark plug 6.

  Further, a knock sensor 8 attached to the engine 1 detects an abnormal sound (knocking) generated during abnormal combustion of the engine 1 and feedback-controls the ignition signal.

  FIG. 2 shows the internal configuration of the engine control unit 9.

  2, the engine control unit 9 includes an input circuit 201, an A / D conversion unit 202, a central processing unit (CPU) 203, a ROM 204, a RAM 205, a nonvolatile memory 208, and an output circuit 206. It is configured by a microcomputer.

  When the input signal 200 is an analog signal (for example, a signal from the AFM 18, the accelerator opening sensor 20, etc.), the input circuit 201 removes a noise component from the signal and outputs the signal to the A / D converter 202. It is to do.

  The central processing unit 203 takes in the A / D conversion result from the A / D conversion unit 202 and executes a fuel injection control program and other control programs stored in a medium such as the ROM 204 to perform each control and diagnosis. Have the ability to perform

  The calculation result and the A / D conversion result are temporarily stored in the RAM 205, and the calculation result is output as a control signal 207 through the output circuit 206 and used for controlling the fuel injection valve 5, the ignition coil 7, and the like.

  The CPU 203 displays information that needs to be displayed on the display unit 209 via the output circuit 206.

  FIG. 3 is a diagram showing an outline of an electronically controlled throttle device in one embodiment of the present invention.

  In FIG. 3, the engine control unit 9 is supplied with a signal such as the accelerator opening of the accelerator opening sensor 20, and the CPU 203 calculates a target throttle opening based on the accelerator opening signal, and outputs a driver IC (output force). The electronic control throttle device (throttle control unit) 17 is controlled via a circuit 206.

  A current is supplied from the battery 302 to the actuator 305 from the battery 302 via the throttle power supply relay (power shutoff unit) 301 and the driver IC 206, and the actuator 305 operates the throttle valve 306. The throttle valve 306 is applied with force by a return spring (throttle valve return mechanism) 308 in the default opening angle direction. In FIG. 3, the return spring 308 is shown in a simplified manner, and the shape and position are not shown exactly.

  The opening degree of the throttle valve 306 is detected by the throttle position sensor 307 and supplied to the CPU 203. The CPU 203 supplied with the accelerator opening and the opening of the throttle valve 306 operates the actuator 305 so that the target throttle opening and the actual throttle opening coincide with each other, and executes feedback control.

  4 and 5 are operation flowcharts of the throttle valve control apparatus according to one embodiment of the present invention.

  In FIG. 4, the diagnosis is started together with the key-on of the automobile, the throttle valve opening is set to a target throttle valve opening 1 (for example, 10 to 30 degrees) on the opening side from the default opening (for example, 8 degrees), and the return spring 308 is (Step 401), and waits until the throttle valve opening converges to the target valve opening 1 (until the predetermined time 1 elapses) (Steps 402 and 403).

  In the case where the target does not converge within the predetermined time 1, that is, when the predetermined time 1 has elapsed, the throttle power relay 301 which is the power shutoff device of the motor 305 which is the actuator is abnormal and the diagnosis of the return spring 308 is not completed. It judges that it is possible, transfers to fail safe mode (step 411), and a diagnosis is complete | finished.

  The fail-safe mode in step 411 is, for example, a safety mode in which the number of revolutions of the engine is lower than that of the normal case.

  In step 402, when the target valve opening degree 1 is converged within the predetermined time 1, the throttle power supply relay 301 is shut off (step 404), and the throttle valve opening degree is within a predetermined time period 2 (for example, default). Wait until it closes below the vicinity of the opening) (steps 405 and 406).

  If the throttle valve 306 is closed within a predetermined time 2 in step 405, the throttle power relay 301 is reconnected (step 407), the throttle power relay normal flag is set (step 408), and the return spring normal flag is set (step Step 409).

  On the other hand, if the throttle valve opening does not fall below the predetermined opening within the predetermined time 2 in step 406, it is determined which of the throttle power supply relay 301 and the return spring 308 has failed (step 410).

  The identification of the abnormal part will be described with reference to FIG.

  After the abnormal part is specified in step 410, the process proceeds to the fail safe mode (step 411).

  Next, identification of the abnormal part will be described with reference to FIG.

  In FIG. 5, when it is determined that either the throttle power relay 301 or the return spring 308 is abnormal, the throttle valve opening is an angle different from the target throttle valve opening 1, and is open from the default opening. The target throttle valve opening 2 is set to 2 (step 501), and a predetermined time 3 is waited until the throttle valve opening converges to the target opening (steps 502 and 503).

  If the throttle valve 306 does not converge to the target throttle valve opening 2 within the predetermined time 3 in step 503, the throttle power relay 301 is determined to be normal (step 506), and the return spring 308 is determined to be abnormal (step 510). ) End the diagnosis.

  On the other hand, if the target throttle valve opening 2 converges within the predetermined time 3 in step 502, it is determined that the throttle power supply relay 301 is abnormal, and the abnormality flag is set to 1 (step 504).

  Thereafter, the throttle valve control duty is set to 0% (power supply to the actuator is cut off by the driver IC 206) (step 505), and it waits for the throttle valve opening to close within a predetermined time 4 until the predetermined opening degree is reached (step 507, 508).

  If the throttle valve is closed within the predetermined time 4 in step 507, the return spring 308 is determined to be normal and the normal flag is set to 1 (step 509).

  If the throttle valve does not close within the predetermined time 4 in step 508, it is determined that the return spring 308 is abnormal (step 510).

  If the actuator 305 or the return spring 308 is abnormal, the ECU 9 causes the display unit 209 to display that an abnormality has occurred.

  6 to 9 are time charts for diagnosis.

  FIG. 6 is a time chart when both the throttle power relay 301 and the return spring 308 operate normally.

  In the case shown in FIG. 6, when the throttle power relay 301 is shut off after setting the throttle valve opening to the target throttle valve opening 1, the driving force of the actuator 305 is lost, and the biasing force of the return spring 308 restricts to the default opening. Since the valve 306 is closed, both the throttle power relay 301 and the return spring 308 can be determined to be normal.

  FIG. 7 is a time chart when the throttle power relay 301 is normal and the return spring 308 is abnormal.

  In the case shown in FIG. 7, when the throttle power relay 301 is turned off after setting the throttle valve opening to the target throttle valve opening 1, the driving force of the actuator 305 is lost but the return spring 308 does not function properly, so the default opening is The closing speed is slow and cannot be closed within 2 hours.

  For this reason, it is determined that at least one of the throttle power supply relay 301 or the return spring 308 is abnormal.

  Then, after setting the target throttle valve opening to the target throttle valve opening 2, the throttle power relay 301 is normal and the return spring 308 is abnormal because it does not converge within the predetermined time 3.

  FIG. 8 is a time chart when the throttle power relay 301 is abnormal and the return spring 308 is normal.

  In the case shown in FIG. 8, even if the throttle power relay 301 is shut off after setting the throttle valve opening to the target throttle valve opening 1, the driving force of the actuator 305 is not lost and feedback is continued to continue the target throttle valve opening 1 Hold.

  Thereafter, assuming that the target throttle valve opening degree is the target throttle valve opening degree 2, the feedback valve converges to the target throttle valve opening degree 2. At this time, the abnormality of the throttle power supply relay 301 can be determined.

  Thereafter, when the feedback is stopped and the throttle control duty is set to 0%, the return spring 308 closes to the default opening, so that it can be determined that the return spring 308 is normal.

  FIG. 9 is a time chart when both the throttle power supply relay 301 and the return spring 308 are abnormal.

  In the case shown in FIG. 9, even if the throttle power relay 301 is shut off after setting the throttle valve opening to the target throttle valve opening 1, the driving force of the actuator 305 is not lost, and feedback is continued to continue the target throttle valve opening 1 Hold. Thereafter, assuming that the target throttle valve opening degree is the target throttle valve opening degree 2, the feedback valve converges to the target throttle valve opening degree 2.

  At this time, the abnormality of the throttle power supply relay 301 can be determined. After that, when the feedback control is stopped and the throttle control duty is set to 0%, although the driving force of the actuator 305 is lost, the return spring 308 does not function properly, so the closing speed to the default opening becomes slow. In this case, it is possible to determine that the return spring 308 is abnormal.

  As described above, according to one embodiment of the present invention, after the engine key of the automobile is turned on, the throttle power supply of the actuator 306 is controlled depending on whether the throttle valve 306 has been opened within the predetermined time 1 to the target opening degree 1. It is determined whether the relay 301 is abnormal or normal, and if the throttle power relay 301 is normal, after the throttle power relay 301 is shut off, depending on whether the throttle valve 306 is closed within the predetermined time 2 until the predetermined opening degree. In this configuration, it is determined whether or not the return spring 308 is abnormal.

  As a result, both the diagnosis of the throttle power relay 301 and the diagnosis of the return spring 308 are performed at an early stage immediately before the start of engine start, and if both the throttle power relay 301 and the return spring 308 are normal Therefore, the internal combustion engine can be started without adversely affecting the startability.

  Also, if both or either of the throttle power relay 301 and the return spring 308 are abnormal, the abnormal point is identified, and after indicating that the abnormality is shown on the display unit, the mode is shifted to the fail safe mode. With this configuration, it is possible to warn the driver or the like of the abnormality before the start of driving, and to further improve the safety of the vehicle.

  Therefore, according to the present invention, the electronic control throttle device does not adversely affect the startability of the internal combustion engine by performing both the power shutoff device of the actuator and the diagnosis of the return spring immediately before the start of engine start. And a throttle control method can be realized.

    DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Piston, 3 ... Intake valve, 4 ... Exhaust valve, 5 ... Fuel injection valve, 6 ... Spark plug, 7 ... Ignition coil, 8. .. Knock sensor, 9 ... Engine control unit (ECU), 10 ... Intake pipe, 11 ... Exhaust pipe, 12 ... Three-way catalyst, 13 ... Air-fuel ratio sensor, 14 ... Collector, 15 ... Crank angle sensor, 16 ... Flywheel, 17 ... Electronically controlled throttle device (throttle control unit), 18 ... Air flow meter, 19 ... Combustion chamber, 20 ... Accelerator opening sensor 201 ... Input circuit 202 ... A / D converter 203 ... CPU 204 ... ROM 205205RAM 206 ... Output circuit 208 ...・ Vulnerable Occurrence memory, 209 ... Display unit, 301 ... Throttle power relay (power cutoff unit), 302 ... Battery, 305 ... Actuator (motor), 306 ... Throttle valve, 307 ... Throttle position sensor, 308 ... Return spring (throttle valve return mechanism)

Claims (4)

A throttle control unit that electrically controls a throttle valve that adjusts intake air of the internal combustion engine;
A power shut-off unit that shuts off power to the throttle control unit;
A throttle valve return mechanism that mechanically closes the throttle valve to a default opening;
The throttle valve by the throttle control unit is opened to the first target throttle valve opening degree of the opening side than the default opening, the throttle valve is in the open to the first target throttle valve opening within the first hour In this state, the power is shut off by the power shutoff unit, the return state of the throttle valve is monitored by the throttle valve return mechanism, and it is determined whether the throttle valve return mechanism and the power shutoff unit are normal. A control unit,
In an electronically controlled throttle device comprising
The engine control unit
When the power is shut off with the throttle valve being opened to the first target throttle valve opening within the first time and the throttle valve is closed to the default opening within the second time, the power supply It is determined that the blocking unit and the throttle valve return mechanism are normal,
If the power is shut off with the throttle valve opened to the first target throttle valve opening within the first time, and the throttle valve does not close to the default opening within the second time, the above The throttle control unit controls the throttle valve to open up to a second target throttle valve opening on the opening side from the default opening different from the first target throttle valve opening.
If the throttle valve converges to the second target throttle valve opening within the third time, it is determined that the power shutoff portion is abnormal, and the throttle valve is determined to be the second target throttle valve within the third time An electronic control throttle device that determines that the power shutoff unit is normal and the throttle valve return mechanism is abnormal when the valve does not converge to the opening degree . The electronically controlled throttle device according to claim 1 ,
The engine control unit stops control of the throttle valve by the throttle control unit when it is determined that the power shutoff unit is abnormal, and the throttle valve reaches the default opening within a fourth time period. If closed, it is determined that the throttle valve return mechanism is normal, and if the throttle valve does not close to the default opening within the fourth time, it is determined that the throttle valve return mechanism is abnormal. Electronically controlled throttle device. In a throttle control method for controlling a throttle valve for adjusting intake air of an internal combustion engine,
The throttle valve is mechanically closed to the default opening by a throttle valve return mechanism,
The throttle control unit that drives the throttle valve open causes the throttle valve to open to a first target throttle valve opening degree that is more open than the default opening degree ,
When the throttle valve is opened within the first time , the power is shut off by the power shutoff unit that shuts off the power to the throttle control unit,
Monitor the return state of the throttle valve by the throttle valve return mechanism that drives the throttle valve closed,
In the throttle control method for determining whether or not the throttle valve return mechanism and the power shut-off unit are normal ,
When the power is shut off with the throttle valve being opened to the first target throttle valve opening within the first time and the throttle valve is closed to the default opening within the second time, the power supply It is determined that the blocking unit and the throttle valve return mechanism are normal,
If the power is shut off with the throttle valve opened to the first target throttle valve opening within the first time, and the throttle valve does not close to the default opening within the second time, the above The throttle control unit controls the throttle valve to open up to a second target throttle valve opening on the opening side from the default opening different from the first target throttle valve opening.
If the throttle valve converges to the second target throttle valve opening within the third time, it is determined that the power shutoff portion is abnormal, and the throttle valve is determined to be the second target throttle valve within the third time A throttle control method comprising: determining that the power shut-off unit is normal and the throttle valve return mechanism is abnormal when the opening does not converge . In the throttle control method according to claim 3 ,
When the upper Symbol power cutoff unit is abnormal, and stops the control of the throttle valve by the throttle control unit, when the throttle valve within the fourth time is closed to the default opening, the throttle A throttle control method characterized in that when the valve return mechanism is determined to be normal and the throttle valve does not close to the default opening within the fourth time, the throttle valve return mechanism is determined to be abnormal. .

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