JPH10115231A - Abnormality detection method for throttle valve control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detection method for a throttle valve control device which can detect abnormality of a throttle back spring in a normal operation state. SOLUTION: Opening of a throttle valve is controlled by energizing force of an accelerator back spring, driving force of a motor transmitted through an electromagnetic clutch, and operation of an accelerator pedal. When the accelerator pedal is opened and the opening of the throttle valve is within a dashpot controlling area in a normal operation state, a timer is operated and sensing of moving rates of the accelerator pedal and the throttle valve is started. When the timer succeeds operation for a specified time T or more, difference of the moving rates between the accelerator pedal and the throttle valve is calculated within the specified time T. It is determined whether the difference is within a normal range or not. When the difference exceeds the normal range, abnormality such as breakage of a throttle back spring is determined, and controlling of the throttle valve is stopped hereinafter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for detecting an abnormality in a throttle valve control device.

[0002]

2. Description of the Related Art Conventionally, a throttle valve control device as shown in FIG. 1 is known. In FIG. 1, a throttle valve 1
Is mounted so that the intake passage can be opened and closed, and a biasing force in the closing direction is applied by a throttle back spring 7. A relief flavor 6 is arranged at one end of the throttle valve 1 and an arm 9 is arranged at the other end thereof. The release lever 6 is movably attached to the accelerator link 4 in a state where a biasing force in the throttle valve opening direction is applied by the relief spring 5, and the movement in the throttle valve opening direction is performed by the accelerator. It is regulated at the position where it contacts the link 4. Also,
The relief flavor 6 is configured to be able to contact the throttle valve 1 in the opening direction. The accelerator link 4 is movably mounted with a biasing force in the throttle valve closing direction applied by an accelerator back spring 3 and is connected to the accelerator pedal 2 via a link mechanism or the like. The arm 9 is connected to the drive motor 8 and serves to restrict the movement of the throttle valve 1 in the opening direction when an abnormality occurs. The throttle valve 1 can be connected to a motor 8 by an electromagnetic clutch 10.
Note that the accelerator pedal 2 is in the open state and the motor 8
When power is not supplied to the, as shown in FIG.
The accelerator link 4 is held at the closing direction regulating position by the urging force of the accelerator back spring 3. Also, release
When the urging force of the spring 5 is the stopping torque of the motor 8, the arm 9 and the electromagnetic clutch 10 (when the electromagnetic clutch 10 is in the ON state and power is not supplied to the motor 8). (Reaction torque) and the biasing force of the throttle back spring 7, so that the relief flavor 6 is held at a position where it contacts the accelerator link 4.
The throttle valve 1 is maintained at the idle operation position. During idling, power is supplied to the motor 8 so that the engine speed matches the target speed during idling, and the throttle valve 1 is rotated via the electromagnetic clutch 10 in the opening or closing direction.

The throttle valve control device shown in FIG. 1 operates as follows. When the ignition switch is turned on to start the engine, the electromagnetic clutch 10 is turned on, and the motor 8 and the throttle valve 1 are connected. At this time, since power is not supplied to the motor 8, the throttle valve 1 is held at the idle operation position. When the accelerator pedal 2 is depressed in this state,
The accelerator link 4 moves in the opening direction against the urging force of the accelerator back spring 3 according to the operation amount of the accelerator pedal 2. When the throttle link 1 is controlled in the opening direction, power is not supplied to the motor 8. Therefore, when the accelerator link 4 moves in the opening direction, the release lever 6 is opened by the urging force of the accelerator back spring 5. Go to Then, the throttle valve 1 moves in the opening direction following the movement of the relief flavor 6 in the opening direction. This allows
The opening amount of the throttle valve 1 is controlled to a value corresponding to the operation amount of the accelerator pedal 2. On the other hand, when the operation amount of the accelerator pedal decreases, the accelerator link 4 moves in the closing direction by the urging force of the accelerator back spring 3. When the accelerator link 4 moves in the closing direction, the release lever 6 moves in the closing direction in contact with the accelerator link 4.
At this time, the throttle valve 1 also attempts to move in the closing direction along with the movement of the release flavor 6 in the closing direction. However, when the throttle valve 1 is controlled in the closing direction, power is supplied to the motor 8. Thus, the movement of the throttle valve 1 in the closing direction is suppressed. When the motor 8 rotates in the rotation direction for moving the throttle valve 1 in the closing direction, the electromagnetic clutch 10
The throttle valve 1 moves in the closing direction by the sum of the driving force of the motor 8 and the urging force of the throttle back spring 7 via the motor. The above is the operation in the normal driving state, but at the time of vehicle control, the vehicle speed is equal to the target speed while the accelerator pedal 2 is opened and the accelerator link 4 is held at the closing direction regulating position. The amount of opening of the throttle valve 1 is controlled by rotating the motor 8 in the opening direction and the closing direction so as to coincide with each other. When the ignition switch is turned off to stop the engine, the electromagnetic clutch 10 is turned off.

In such a throttle valve control device, a method of detecting an abnormality of a throttle back spring or the like is required for ensuring safety. Conventionally, JP-A-2-200
There is known a method for detecting an abnormality of a throttle valve control device as described in Japanese Patent No. 537. In this conventional abnormality detection method, abnormality is detected when the vehicle control is released and an OFF command is output to the electromagnetic clutch. Therefore, until the OFF command is output to the electromagnetic clutch, that is, during normal operation. No abnormality can be detected in the state. In particular, in the throttle valve control device in which the electromagnetic clutch is in the on state during the operation of the engine as shown in FIG. 1, an abnormality cannot be detected until the engine is stopped.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has an abnormality in a throttle valve control device capable of detecting an abnormality such as a throttle back spring in a normal operation state. It is an object to provide a detection method.

[0006]

According to a first aspect of the present invention, there is provided a throttle valve for controlling an opening amount of a throttle valve by at least a throttle back spring biased in a closing direction and an accelerator pedal. An abnormality detection method for a control device, wherein when an accelerator pedal is released, an accelerator pedal movement amount and a throttle valve movement amount are compared, and if the comparison result is not within a normal range, an abnormality is detected. And According to the abnormality detection method of the throttle valve control device according to the first aspect, the abnormality is detected when the accelerator pedal is opened, so that the abnormality can be detected in the normal operation state,
Safety is improved. According to a second aspect of the present invention, in the abnormality detection method for a throttle valve control device according to the first aspect, the two movement amounts are compared based on a difference between an accelerator pedal movement amount and a throttle valve movement amount. If the abnormality detection method for the throttle valve control device according to the second aspect is used, the abnormality can be easily detected. According to a third aspect of the present invention, in the method for detecting an abnormality of the throttle valve control device according to the first or second aspect, an accelerator pedal movement amount and a throttle valve movement amount are compared in a dashpot control region. According to the abnormality detection method of the throttle valve control device according to the third aspect, the amount of movement of the accelerator pedal is compared with the amount of movement of the throttle valve in a dashpot control region where the amount of movement of the throttle valve is reduced. Can be easily determined whether or not the comparison result is within the normal range.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a configuration diagram of the throttle valve control device shown in FIG. An intake passage 21 is provided in the throttle body 20, and the throttle valve 1 is disposed in the intake passage 21. The throttle valve 1 is mounted on a throttle shaft 22, and the throttle shaft 22 is rotatably mounted on the throttle body 20 by bearings 23 and 24. Thus, the throttle valve 1 can rotate in an opening direction for opening the intake passage 21, for example, a clockwise rotation direction and a direction for closing the intake passage, for example, a left rotation direction. One side of the throttle shaft 22 is connected to the rotating shaft 25 of the motor 8 via the electromagnetic clutch 10. A boss 26 is provided on the other side of the throttle shaft 22.
Is attached. The boss portion 26 is urged by the throttle back spring 7 in the throttle valve closing direction, in this case, the left rotation direction, with respect to the throttle body 20. The throttle body 4 has an accelerator link 4 connected to an accelerator pedal via a link mechanism or the like.
Is rotatably provided. The accelerator link 4 is connected to the throttle body 20 by the accelerator back spring 3.
Is biased in the direction of closing the throttle valve, in this case, in the counterclockwise direction. A relief flavor 6 is provided rotatably with respect to the accelerator link 4. Lily Flavor 6
Are urged by the relief spring 5 in the throttle valve opening direction, in this case, the clockwise direction, with respect to the accelerator link 4, and are arranged so as to be able to contact the boss portion 26 at a predetermined position on the throttle valve opening direction side. Have been. The throttle sensor 30 detects the rotation angle of the throttle shaft 22, that is, the opening amount of the throttle valve 1, and the acceleration sensor 32 detects the rotation angle of the sensor shaft 31 attached to the accelerator link 4, that is, the operation amount of the accelerator pedal.
Is provided.

FIG. 3 shows a schematic configuration diagram of a control device for controlling the motor 8 and the electromagnetic clutch 10. As shown in FIG. Control device 50
Is a CPU (central processing unit) 51, a ROM 52 storing a control program and the like, and an R storing processing data and the like.
AM53, drive unit 5 for supplying drive current to motor 8
4. Driving unit 55 that supplies operating current to electromagnetic clutch 10
And the like. The CPU 51 receives a throttle sensor output from the throttle sensor 30, an accelerator sensor output from the accelerator sensor 32, an ignition switch on / off signal, an automobile control signal, and the like. The CPU 51 supplies an operating current to the electromagnetic clutch 10 via the drive unit 55 when an ignition switch ON signal is input. When the operation amount of the accelerator pedal 2 decreases, the motor is driven via the drive unit 54 to move the throttle valve 1 in the closing direction to the throttle valve opening position corresponding to the operation amount of the accelerator pedal 2. 8 is supplied with a drive current. When the vehicle control signal is input, the vehicle speed at that time is stored as a target speed, and the motor is controlled via the drive unit 54 so that the vehicle speed matches the target speed. 8 is supplied with a drive current. Further, when the accelerator pedal is released in the normal operation state, the amount of throttle valve movement and the amount of accelerator pedal movement are obtained, the two amounts of movement are compared, and based on the comparison result, it is determined whether an abnormality has occurred. Is detected.

An embodiment of the abnormality detecting process will be described with reference to a flowchart shown in FIG. The abnormality detection process shown in FIG. 4 is performed at an appropriate time during normal operation, for example, at time intervals according to engine rotation. First, it is determined whether or not the accelerator pedal is in an open state (step P1). If the accelerator pedal is not in the released state, the process ends. If the accelerator pedal is in the released state, it is determined whether or not it is in the dashpot control range (step P2). Dash-pot control is a technique that when the engine shifts from a steady or accelerated state to a decelerated state, the fuel adhering to the intake pipe evaporates rapidly and a rich mixture temporarily flows into the combustion chamber, and the volumetric efficiency This is control to temporarily delay the throttle valve from closing to the idle position during deceleration in order to prevent an ignition error from easily occurring due to a decrease in the residual gas ratio and an increase in the residual gas ratio. As this dashpot control area, for example,
An area where the opening amount of the throttle valve is equal to or less than a predetermined opening amount, an area where the engine rotation speed is equal to or lower than a predetermined speed, and the like are set. In the dashpot control range, since the amount of movement of the throttle valve decreases, the difference between the amount of accelerator pedal movement and the amount of throttle valve movement increases, and the comparison result between the amount of accelerator pedal movement and the amount of throttle valve movement is within the normal range. It is easy to determine whether or not it is. If it is not in the dashpot control range, for example, if the opening amount of the throttle valve is equal to or more than the predetermined opening amount, the process ends. If it is in the dashpot control area, it is determined whether or not the timer is operating (step P3). If the timer is not operating, the timer is started (step P4), and the detection of the accelerator pedal movement amount and the throttle valve movement amount is started based on the accelerator sensor output and the throttle sensor output (step P4). P5), the process ends. If the timer is in operation, it is determined whether the timer has elapsed for a predetermined time T or more (step P6). Timer is a predetermined time T
If not, the process ends.

When the timer has elapsed for a predetermined time T or more, the amount of movement of the accelerator pedal and the amount of movement of the throttle valve after the timer is started are compared. Find the difference from the valve travel,
As a result of the comparison, in this case, it is determined whether or not the difference between the two movement amounts is within the normal range (step P7). When the throttle back spring 7 and the like are normal, the throttle valve 1 is closed by the sum of the driving force of the motor 8 transmitted through the electromagnetic clutch 10 and the urging force of the throttle back spring 7. Move in the direction. On the other hand, when an abnormality such as breakage of the throttle back spring 7 occurs, the moving speed of the throttle valve 1 decreases. If the difference between the two movement amounts is within the normal range, the timer is restarted (step P8), and the detection of the accelerator pedal movement amount and the throttle valve movement amount is started again (step P9), and the processing is performed. To end. If the difference between the movement amounts is not within the normal range, the control of the throttle valve is stopped (step P10). Note that the timer is turned off when the determination results in steps P1 and P2 are NO (step P1
1) The processing may be terminated later.

The abnormality detection processing shown in FIG. 4 will be specifically described with reference to FIG. In FIG. 5, a broken line A indicates an accelerator sensor output, a solid line S1 indicates a throttle sensor output in a normal state, and a one-dot chain line S2 indicates a throttle sensor output in an abnormal state. When the accelerator pedal 2 is released, the accelerator link 4 moves in the closing direction by the urging force of the accelerator back spring 3. As a result, the accelerator sensor output also decreases as indicated by the broken line A. When the throttle valve 1 is controlled in the closing direction, a driving current in the closing direction is supplied to the motor 8, so that the throttle valve 1 is driven by the motor 8 via the electromagnetic clutch 10 and the driving force of the motor 8 is controlled. It moves in the closing direction by the sum of the biasing force of the throttle back spring 7. At this time, when the throttle back spring 7 and the like are normal, the output of the throttle sensor decreases as shown by a solid line S1, and when an abnormality such as breakage of the throttle back spring 7 occurs, the throttle sensor output is reduced by one point. It decreases as shown by the dashed line S2. When the opening amount of the throttle valve becomes equal to or less than the predetermined opening amount, the accelerator pedal movement amount ΔA and the throttle valve movement amount ΔS within a predetermined time T are obtained.
1. It is determined whether or not the difference from ΔS2 is within a normal range. When the throttle back spring 7 and the like are normal, the difference between the two movement amounts is within the normal range because the throttle valve movement amount ΔS1 is large, but when the abnormality such as breakage of the throttle back spring 7 occurs. Since the throttle valve movement amount ΔS2 becomes smaller, the difference between the two movement amounts is outside the normal range. This makes it possible to detect an abnormality such as breakage of the throttle back spring.

Although it is difficult to detect a completely fixed abnormality of the electromagnetic clutch 10 by the above-mentioned method, when the electromagnetic clutch 10 has a half-coupled or inoperable abnormality, the electromagnetic clutch 10 is used. Since the driving force of the motor 8 decreases and the moving speed of the throttle valve decreases, it is possible to detect a half-engagement of the electromagnetic clutch 10 or an abnormality in which the electromagnetic clutch 10 cannot operate.

In the above embodiment, the difference between the accelerator pedal movement amount and the throttle valve movement amount is obtained in the dashpot control region. However, the accelerator pedal movement amount and the throttle valve movement amount in the region other than the dashpot control region. The difference from the amount may be obtained. Further, the difference between the accelerator pedal movement amount and the throttle valve movement amount is obtained every T time, but the difference between the accelerator pedal movement amount and the throttle valve movement amount may be calculated only once. Although the abnormality detection is performed based on the difference between the accelerator pedal movement amount and the throttle valve movement amount, the abnormality detection may be performed based on the ratio between the accelerator pedal movement amount and the throttle valve movement amount. . Further, when the ignition switch is turned on in the present invention, the electromagnetic clutch is turned on,
When the electromagnetic clutch is turned off when the ignition switch is turned off and the throttle valve is controlled in the closing direction, or when applied to a throttle valve control device that supplies power to the motor at the time of vehicle control. As described above, the present invention can also be applied to a throttle valve control device that turns on the electromagnetic clutch when the throttle valve is controlled in the closing direction or when the vehicle is controlled.

[0014]

As described above, if the abnormality detection method for the throttle valve control device according to the first aspect is used, the abnormality can be detected in the normal operation state, so that the abnormality can be quickly detected. Yes, safety is improved. Further, the abnormality can be easily detected by using the abnormality detection method of the throttle valve control device according to the second aspect.
Further, if the abnormality detection method of the throttle valve control device according to the third aspect is used, it can be easily determined whether or not the comparison result between the two movement amounts is within the normal range.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a throttle valve control device.

FIG. 2 is a configuration diagram of a throttle valve control device.

FIG. 3 is a schematic diagram of a control device.

FIG. 4 is a flowchart of an abnormality detection process.

FIG. 5 is a diagram illustrating a change state of an accelerator sensor output and a throttle sensor output when the accelerator pedal is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle valve 2 Accelerator pedal 3 Accel back spring 4 Accel link 5 Relief spring 6 Relief flavor 7 Throttle back spring 8 Motor 10 Electromagnetic clutch 30 Throttle sensor 32 Accel sensor 51 CPU

Claims (3)

[Claims] An abnormality detecting method for a throttle valve control device for controlling an opening amount of a throttle valve by at least a throttle back spring biased in a closing direction and an accelerator pedal, wherein when an accelerator pedal is opened, an accelerator is released. An abnormality detection method for a throttle valve control device, comprising: comparing a pedal movement amount and a throttle valve movement amount; and detecting an abnormality when the comparison result is not within a normal range. 2. The abnormality detection method for a throttle valve control device according to claim 1, wherein the two movement amounts are compared based on a difference between an accelerator pedal movement amount and a throttle valve movement amount. 3. The method according to claim 1, further comprising comparing an accelerator pedal movement amount and a throttle valve movement amount in a dashpot control range.