JPH0361656A - Detection of anomality in controller for control valve - Google Patents

Abstract

PURPOSE:To prevent the detection of anomaly by comparing each output value of an accelerator pedal operation quantity detector, opening degree detector, and a motor position detector and detecting anomaly when the difference between the output values is over a nonsensitive band width. CONSTITUTION:In the controller for a control valve, each turning position of an accelerator operating lever 8 and a throttle shaft 2 coincide in the normal state, and in the traction control by a step motor 52, the turning position of the shaft 2 and the turning position of the step motor 52 corresponding to the input drive pulse coincide. Then, each output value of an accelerator pedal operation quantity detector 38, throttle opening degree detector 46, and a motor position detector is compared each other, and anomaly is detected. In this case, the nonsensitive width is set on the basis of the dispersion for the linearity of each detector, and if the difference between the output values is within the nonsensitive width, detection as anomaly is not carried out. Therefore, the trouble of the detection of anomaly in spite of the normal case can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an abnormality detection method for a control valve control device.

[Conventional technology]

The applicant uses a single control valve, and in normal conditions the opening degree of the control valve can be determined by accelerator pedal operation, and in automatic control conditions such as traction control, regardless of the accelerator pedal operation. First, we devised a control valve control device that can automatically control the opening degree of the control valve.

Such a control valve control device includes, for example, a butterfly-type throttle valve, which is rotatably supported on a support body and has a throttle shaft that is biased by a spring in the closing direction of the throttle valve, and has an operation that is linked to the operation of an accelerator pedal. The lever is supported for relative rotation and is coupled to a control lever that is interlocked and connected to a step motor, and engages with the operating lever in response to rotation of the operating lever in the throttle valve closing direction. A lost motion spring is interposed between the lost motion lever and the lost motion lever, which is fixed to the throttle shaft.

However, with this control valve control device, the spring may break or
The shaft may become stuck due to adhesion of carbon, etc., or the step motor may lose synchronization. In this case, the control valve may not be controlled properly, resulting in various inconveniences and dangerous situations. There is a risk of

[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and is capable of detecting an abnormality in the control valve control device, and is capable of detecting an abnormality even when the throttle control device is actually normal. The purpose of this invention is to provide an anomaly detection method that is free from the risk of being detected as an anomaly.

[Means to solve the problem]

In order to solve the above problems, the present invention has a control valve, is rotatably supported on a support body, and has a shaft that is biased by a spring in the closing direction of the control valve, and is provided with a shaft that is connected to a shaft that is connected to a shaft that is biased in a direction in which the control valve is closed. An interlocking operating lever is supported for relative rotation and is connected to a control lever that is interlocked and connected to a step motor, and the operating lever and the operating lever are rotated in response to rotation of the operating lever in the control valve closing direction. In the control valve control device, a lost motion spring is interposed between the lost motion lever fixed to the shaft to be engaged with the operating lever and the lost motion spring that exerts a spring force in a direction to engage the operating lever and the lost motion lever. , an accelerator pedal operation amount detector that detects the rotational position of the operating lever, an opening degree detector that detects the rotational position of the shaft, and a drive pulse signal that should be originally determined according to the drive pulse signal input to the step motor. A motor position detector is provided for detecting the rotational position of the shaft based on the drive pulse signal, and the output value of the accelerator pedal operation amount detector, the output value of the opening degree detector, and the motor position detection means are provided. Abnormalities in the control device are detected by comparing three output values.

Even if there is a difference within the dead width between the output values, the difference is ignored and compared.

[Effect]

In the above control valve control device, if normal, the rotational position of the operating lever and the rotational position of the shaft match in the normal state, and the rotational position of the shaft and the rotational position of the shaft match in the automatic control state such as traction control. The rotational position of the shaft that should originally be determined according to the drive pulse signal input to the motor should match, and these positions should also match or be shifted in the closing direction with respect to the rotational position of the operating lever. be.

Therefore, in the present invention, an accelerator pedal operation amount detector, an opening degree detector, and a motor position detector are provided, and the output values of these three are compared with each other, so that it is possible to detect an abnormality in the throttle control device. It is something that can be done.

However, if the respective output values are compared too strictly, the accelerator pedal operation amount detector and the throttle opening degree detector actually have variations in output values with respect to rotational positions. Therefore, it is detected as abnormal even though it is actually normal.

In this regard, in the present invention, even if there is a predetermined difference between the above output values, the difference is ignored and compared, so there is no risk of detecting an abnormality when it is actually normal. .

〔Example〕

An example in which the method of the present invention is applied to the control of a butterfly-type throttle valve 6, which is a control valve in a throttle control device for an automobile shown in FIGS. 1 to 5, will be described below.

First, the throttle control device for an automobile shown in FIGS. 1 to 5 will be explained.

This throttle control device has a butterfly-type throttle valve 6, which is rotatably supported by a support 1, and which is linked to the operation of an accelerator pedal by a throttle shaft 2 that biases a spring in the closing direction of the throttle valve 6. Operation lever 8
is supported so as to be relatively rotatable, and is connected to a control lever 9 which is interlocked and connected to a step motor 52 serving as an actuator. A lost motion spring is interposed between the lost motion lever 7, which is fixed to the throttle shaft 2 so as to be engaged with the operating lever 8, and which exerts a spring force in the direction of engaging the operating lever 8 and the lost motion lever 7. A regulation lever 63 is supported on the support body 1 so as to be rotatable around an axis parallel to the throttle shaft 2. The regulation lever 63 is connected to rotate in one direction in response to the rotation of the lost motion lever 7 in the throttle valve closing direction when the rotation is in the throttle valve closing direction. A dash board 56 that provides damping force is connected to the dash board 56.

The throttle control device shown in FIGS. 1 to 5 will be explained in detail below.

A throttle shaft 2 is rotatably supported on a throttle body 1 as a support via bearings 3 and 4, and an intake passage 5 formed in the throttle body 1 is provided on the throttle shaft 2 to open and close it. A butterfly-type throttle valve 6 is fixed thereto.

Both ends of the throttle shaft 2 project from the throttle body 1 on both sides, and a tenth motion lever 7 is fixed to one end of the throttle shaft 2 projecting from the throttle body 1 (left side in FIG. 3). The operating lever 8 is supported so as to be relatively rotatable. Further, a control lever 9 is fixed to the other end of the throttle shaft 2 protruding from the throttle body 1 (on the right side in FIG. 3).

On one end side of the throttle shaft 2 protruding from the throttle body 1, the outer periphery of the throttle shaft 2 is cut out so as to form a pair of flat surfaces along the axis, and a rectangular portion having a substantially rectangular cross-sectional shape is formed. 2a is provided. Rectangular part 2a
includes, in order from the proximal end to the distal end thereof, a cylindrical collar 10 whose inner end abuts against the bearing 3, and a basically disc-shaped restriction abuts the outer end of the collar 10. a plate 11, a cylindrical collar 12 whose inner end is in contact with the regulation plate 11, and a tenth
A nut 13 is screwed onto the outer end of the throttle shaft 2 which is fitted with the tenth stroke lever 7 and projects from the tenth stroke lever 7, and a collar 10. Regulation plate 1
1, a collar 12 and a tenth motion lever 7 are fixed to the throttle shaft 2.

The operating lever 8 consists of a cylindrical portion 8a coaxially surrounding a cylindrical collar 10, and a drum portion 8b fixed to the outer end of the cylindrical portion 8a, with a bearing 14 interposed therebetween. and is attached to the collar 10. Further, the axial position of the cylindrical portion 8a is regulated by a member 15 and a regulating plate 11, which is a resin bearing that abuts on the outer surface of the throttle body 1. A throttle wire 16 that is pulled and driven by a throttle operating section (not shown) is wound around the drum section 8b, and an engagement piece 17 provided at one end of the throttle wire 16 is engaged with the drum section 8b. Therefore, the operating lever 8 is moved by the arrow 1 in FIG.
It is rotationally driven in the throttle valve opening direction indicated by 8. Moreover, a coiled first return spring 19 that surrounds the cylindrical portion 8a is interposed between the operating lever 8 and the throttle body 1, and this first return spring 19 moves the operating lever 8 in the opposite direction as indicated by the arrow 18. energize the throttle valve in the direction 20.

Between the operation lever 8 and the tenth stroke motion lever 7, the tenth stroke motion lever 7 follows the rotational movement of the operation lever 8, and a throttle valve closing direction 20 of the tenth stroke motion lever 7 is provided. A lost motion mechanism 25 is provided that can prevent the rotational movement from affecting the operating lever 8 . This lost motion mechanism 25 extends to the tenth motion lever 7 side, and the engagement arm portion 2 provided on the drum portion 8b of the operation lever 8
1, an engagement arm 22 provided on the tenth stroke motion lever 7 to engage with the engagement arm 21, and an operating lever 8.
and a tenth force motion spring 23 interposed between the tenth force motion lever 7, and the engaging arm portion 21.
The relative positions of the springs 22 are set so that the spring forces of the tenth motion springs 23 act in the direction of mutual engagement.

According to such a lost motion mechanism 25, when the operating lever 8 is rotated in the throttle valve opening direction 18 against the spring force of the first and second return springs 19, 24 by operating the accelerator pedal, the tenth Storm motion spring 23
The spring force causes the tenth motion lever 7 to rotate in the throttle valve opening direction 18, and the throttle shaft 2 to rotate in the throttle valve opening direction 18. Further, when the operating lever 8 is rotated in the throttle valve closing direction 20, the engaging arm 2
1.22 engagement causes the tenth stroke motion lever 7 and the throttle shaft 2 to close the throttle and rotate in the left direction 20.

The tenth motion spring 23 also has an operating lever 8.
a second return spring 2 that biases the throttle valve in the throttle valve closing direction 20;
4 is interposed.

The tenth motion spring 23 and the second return spring 24 are formed in a coil shape, and the receiver received by the tenth motion lever 7 is connected to the member 25 and the regulating plate 11.
A receiver received by the collar 12 is disposed coaxially surrounding the collar 12 with the member 26. These receivers are members 25.26
is formed of a synthetic resin into a bottomed double cylindrical shape surrounding the collar 12, the tenth motion spring 23 has both supports on the inner side between the members 25 and 26, and the second return spring 24 has both supports on the inner side between the members 25 and 26. It is arranged on the outer side between members 25,26. 1st
One end 23a of the zero stroke motion spring 23 is engaged with the engagement arm 22 of the tenth stroke motion lever 7, and the other end 23a
b is engaged with the engagement arm portion 21 of the operating lever 8. Further, one end 24B of the second return spring 24 is engaged with the engaging arm portion 21, and the other end 24b is engaged with the throttle body 1.

A bracket 26 is fixed to the throttle body 1, and the bracket 26 is provided with a cylindrical support member 26a having an axis parallel to the throttle shaft 2. The detection shaft 27 is rotatably supported by the cylindrical support member 26a. This detection shaft 271; supports a 20th stroke motion lever 28 which is interlocked and connected to the operation lever 8 so as to be relatively rotatable, and also supports the 20th stroke motion lever 28.
Two detection levers that can be engaged with are fixed.

At one end of the detection 1To27 protruding from the cylindrical support member 26a of the bracket 26, there is a small-diameter male screw portion 27a with a substantially rectangular cross-sectional shape formed into a stepped portion 27. The male threaded portion 27a penetrates through the two detection levers, making relative rotation impossible. Moreover, the stepped portion 27b
A nut 30 is screwed onto the male screw portion 27a protruding from the two detection levers in contact with the detection lever 29, and by tightening the nut 30, the detection lever 29 is fixed to the detection shaft 27.

Further, the 20th motion lever 28 is connected to the bracket 2
It is attached to the detection shaft 27 so that it can rotate relative to the outer end of the cylindrical support member 26a in 6 and the two detection levers. The plate-shaped disc portion 28b and the drum portion 8b of the operating lever 8 are interlocked and connected to each other via a connecting link 31. This connecting link 31 is designed to rotate the 20th stroke motion lever 28 in the direction in which the accelerator pedal is depressed, as indicated by an arrow 32, in response to the rotation of the operating lever 8 in the throttle valve opening direction 18. Both levers 8 and 28 are connected to rotate the 20th stroke motion lever 28 in the return direction 34 of the accelerator pedal, which is opposite to the direction 32 in which the accelerator pedal is depressed, in response to the closing of the throttle leftward 20. be.

An engagement pin 33 having an axis parallel to the cylindrical support member 26a is implanted in the bracket 26.
A 20th motion spring 35 is interposed between the detection lever 29, that is, the detection shaft 27, and urges the detection lever 29 to rotate in the return direction 34 of the accelerator pedal. The 20th strike motion spring 35 is formed into a coil shape that surrounds the cylindrical support member 26a. One end 35a of the 20th strike motion spring 35 is engaged with the detection lever 29, and the other end 35b is engaged with the engagement pin 33. engaged.

The disc portion 28b of the 20th stroke motion lever 28 is provided with an engaging portion 36, and the detection lever 29 is provided with an engaging portion 37 that can be engaged with the engaging portion 36. The relative position of the two image matching parts 36 and 37 is determined by the spring force of the 20th stroke motion spring 35 interposed between the detection lever 29 and the engagement pin 33, that is, the spring force of the detection lever 29 in the accelerator pedal return direction 34. The spring forces are set to act in mutually engaging directions.

Therefore, when the 20th stroke motion lever 28 rotates in the accelerator pedal depression direction 32 as the operating lever 8 rotates in the throttle valve opening direction 18, the engaging portion 3
6 and 37, the detection lever 29 rotates in the accelerator pedal return direction 34, and as the operating lever 8 rotates in the throttle closing valve direction 20, the 20th stroke motion lever 28 rotates in the accelerator pedal return direction 34. When the accelerator pedal is rotated in the return direction 34, the two detection levers are rotated in the return direction 34 of the accelerator pedal by the spring force of the 20th stroke motion spring 35, which corresponds to the amount of rotation of the operation lever 8, that is, the amount of operation of the accelerator pedal. The detection lever 29, that is, the detection shaft 27 rotates.

Further, an accelerator pedal operation amount detector 38 is fixed to the bracket 26 so as to face the other end of the detection shaft 27, and three levers fixed to the other end of the detection shaft 27 are connected to the accelerator pedal operation amount detector 38. It is connected to 38.

A cylindrical collar 41 is fitted to the base of the other end of the throttle shaft 2 protruding from the throttle body 1 so that its inner end abuts against the bearing 4 .

Furthermore, a control lever 9 is fixed to the other end of the throttle shaft 2 that protrudes from the collar 41. Further, a driven gear 43 is rotatably supported on the collar 41 via a bearing 42, and this driven gear 43 is attached to the throttle body 1.
The control lever 9 is rotated in the throttle valve opening direction 18 by a third return spring 44 interposed between the control lever 9 and the control lever 9 . Further, a throttle opening detector 46 facing the other end of the throttle shaft 2 is supported and fixed to a bracket 45 fixed to the outer surface of the throttle body 1, and the control lever 9 is connected to the other end of the throttle shaft 2. A lever 47 fixed therewith is connected to a throttle opening detector 46 which is an opening detector. Therefore, the amount of rotation of the throttle shaft 2, that is, the opening degree of the throttle valve 6, which is a control valve, is detected by the throttle opening degree detector 46.

A support shaft 48 having an axis parallel to the throttle shaft 2 is supported between the throttle body 1 and the bracket 45, and four intermediate gears meshing with the wave gear 43 are mounted on this support shaft 48 via bearings 5o. Rotatably supported.

Furthermore, the intermediate gear 49 is biased so as to be supported in the thrust direction by the bracket 45 by a spring 51 interposed between the intermediate gear 49 and the outer surface of the throttle body 1 to regulate its axial position.

A step motor 52 as an actuator is supported on the bracket 45, and a drive gear 54 fixed to an output shaft 53 of the step motor 52 is connected to the intermediate gear 4.
is engaged with. Therefore, the operation of the step motor 52 rotationally drives the throttle llh2 via the drive gear 54, the intermediate gear 49, the driven gear 43, and the control lever 9. By operating the step motor 52 when the throttle valve 6 is opened to the desired opening degree by operating the accelerator pedal, the throttle valve 6 is rotationally driven in the closing direction. At this time, the throttle shaft 2 resists the spring force of the tenth motion spring 23 to
Since the throttle wires 16 are rotated in the throttle closing valve direction 20 while moving away from each other, the throttle wire 16 is not affected.

A dashpot 56 is supported and fixed to the throttle body 1 for slowing the rotational movement of the tenth stroke motion lever 7 supported on the throttle shaft 2 in the throttle valve closing direction 20.

This dashpot 56 is conventionally well known, and includes a housing 57 having a peripheral portion of a diaphragm 60 that divides the inside of the housing 57 into a suction chamber 58 and five atmospheric pressure chambers, and a central portion of the diaphragm 60 that divides the interior of the housing 57 into a suction chamber 58 and five atmospheric pressure chambers. On the atmospheric pressure chamber 59 side, one end of a connecting rod 61 that movably passes through the nozzle 57 and extends outward is connected via a retainer 80.

A suction pipe 81 communicating with the suction chamber 58 is connected to the housing 57, and this suction pipe 81 is opened to the atmosphere via a jet 82 at its tip.

Therefore, when trying to drive the connecting rod 61 to read the diaphragm 60 in the direction of increasing the volume of the suction chamber 58, the jet 82 acts to drive the connecting rod 61.
A force acts in the opposite direction to the driving direction.

On the other hand, a support bolt 62 having an axis parallel to the throttle shaft 2 is screwed onto the outer surface of the throttle body 1, and a regulation lever 63 and a forced activation lever 64 are rotatably attached to the support bolt 62. supported. That is, between the head 62a of the support bolt 62 and the throttle body 1, in order from the head 62a side, there is a cylindrical collar 65 that surrounds the support bolt 62, and a disc that abuts the inner end of the collar 65. a cylindrical collar 67 that surrounds the support bolt 62 with its outer end in contact with the regulation plate 66, and a regulation plate 68 that is interposed between the inner end of the collar 67 and the throttle body 1. are fitted in this order, and by tightening the support bolt 62, the collar 65, regulation plate 66, collar 67, and regulation plate 68 are fixed to the support bolt 62. The regulation lever 63 is rotatably supported by a collar 65 between the head 62a of the support bolt 62 and the regulation plate 66, and the forced activation lever 64 is rotatably supported by the collar 671 between the regulation plates 66 and 68. The supported regulation lever 63 has an adjustment screw 6 whose tip can come into contact with a contact arm 70 provided on the tenth motion lever 7.
are screwed together so that the advancing and retracting positions can be adjusted, and the 51
The relative positions of the setting screw 69 and the contact arm portion 70 are set so that they come into contact with each other in accordance with the rotation of the tenth stroke motion lever 7 in the throttle closing valve direction 20. Further, an adjustment screw 71 is screwed into the throttle body 1 so that the forward and backward positions can be adjusted when the tenth motion lever 7 rotates to the position where the throttle valve 6 is fully opened. be done.

The other end of the connecting rod 61 in the dash bot 56 is connected to the regulating lever 63, and the connecting state of the connecting rod 61 is such that when the adjusting screw 69 is in contact with the abutting arm 70, the tenth motion lever 7 The diaphragm 60 to which the connecting rod 61 is connected is bent to increase the volume of the suction chamber 58 when the valve is rotated in the throttle valve closing direction 20 .

The forced activation lever 64 is provided with an abutment arm 72, and an adjustment screw 73 whose tip can be brought into contact with the abutment arm 72 is screwed into the regulation lever 63 so that its forward and backward positions can be adjusted. The relative positions of the abutment arm 72 and the adjustment screw 73 are determined in the direction in which the abutment arm 72 abuts the adjustment screw 73 due to the spring force of the spring 74 interposed between the throttle body 1 and the forced activation lever 64. It is set to be energized by This spring 74 has a spring force that urges the tenth stroke motion lever 7 in the throttle valve opening direction 18 via the restriction lever 63 which is in contact with the forced activation lever 64 by the contact arm portion 72 and the adjustment screw 73. When the operating lever 8 rotates in the throttle valve opening direction 18 from the fully open position of the throttle valve 6, the regulation lever 63 and the forced activation lever 64 follow and rotate due to the spring 74, and the dash When the retainer 80 of the bot 56 contacts the inner surface of the housing 57 on the suction chamber 58 side, the adjustment screw 69
Then, the contact state of the contact arm portion 70 is released.

In FIG. 5, an operating lever 8 and a forced activation lever 6 are shown.
Between 4 and 4, when the operation lever 8 located at the position corresponding to the fully open position of the throttle valve 6 is rotated in the throttle valve opening direction 18, the forced activation lever 64 is forcibly rotated, and the regulation lever 63 is rotated. A forced activation mechanism 75 is provided for forcibly rotating the tenth motion lever 7, that is, the throttle shaft 2, in the throttle valve opening direction 18 via the throttle valve opening mechanism 75.

The forced activation mechanism 75 includes a pressure receiving surface 76 provided on the side surface of the forced activation lever 64, and a roller that is pivoted on the operating lever 8 and has an axis parallel to the throttle shaft 2 so as to move along the pressure receiving surface 76. It consists of 77. In addition, the pressure receiving surface 76 and the roller 77 are in contact with each other between the position of the operating lever 8 corresponding to the fully closed position of the throttle valve 6 and the position where the operating lever 8 is slightly rotated in the throttle valve opening direction 18 from that state. The pressure receiving surface 76 rotates the forced activation lever 64 in the throttle valve opening direction 18 by a roller 77 in response to the rotation of the operating lever 8 in the throttle valve opening direction 18 from the fully open position. Formed as expected.

Next, the operation of the throttle control device shown in FIGS. 1 to 5 will be explained.

When the operating lever 8 is rotated in the throttle valve opening direction 18 by operating the accelerator pedal while the step motor 52 is fully open and stopped, the engagement arms 21, 22
Due to the engagement, the tenth motion lever 7, that is, the throttle shaft 2, is rotated in the throttle valve opening direction 18,
The throttle valve 6 is rotated in the throttle valve opening direction 18 to a desired opening degree.

At this time, the step motor 52 is in a freely rotatable state, and in response to the rotational movement of the throttle valve 6 in the opening direction,
Rotational power is also transmitted to the step motor 52 via the control lever 9 and the gears 43, 48.degree. 53, so that the step motor 52 rotates freely.

The rotational movement of the operating lever 8 in response to the accelerator pedal operation is also transmitted to the 20th stroke motion lever 28 via the connecting link 31, and the two detection levers are activated by the engagement of the engaging portions 36 and 37. That is, the detection element 27 rotates in the direction 32 of pressing the accelerator pedal. Therefore, the rotation amount of the throttle shaft 2, that is, the throttle opening degree can be detected by the throttle opening degree detector 46, and the rotation amount of the operating lever 8, that is, the accelerator pedal operation amount can be detected by the accelerator pedal operation amount detector 38.

By the way, at the initial stage of rotating the throttle valve 6 from its fully closed position in the throttle valve opening direction 18,
If only the operating lever 8 and the tenth motion lever 7 are interlocked and connected via the lost motion mechanism 25, the starting force of the throttle shaft 2 will be insufficient, and the initial rotational movement of the throttle shaft 2 will not be smooth. There are cases. However, due to the action of the forced activation mechanism 75, the initial rotational movement of the throttle shaft 2 is forcibly performed. That is, when the operating lever 8 rotates to rotate the throttle valve 6 from its fully open position, the lost motion lever 7 contacts the pressure receiving surface 76 and rolls, thereby rotationally driving the forced activation lever 64. The rotation of the starting lever 64 is caused by the contact arm 72
The force is transmitted to the regulating lever 63 in contact via the adjusting screw 73, and is further transmitted to the tenth motion lever 7, which has an abutting arm portion 70 in contact with the adjusting screw 69 of the regulating lever 63. Therefore, during the initial rotation of the operating lever 7, the tenth stroke lever 7 is forcibly rotated, and the initial rotation of the throttle shaft 2, that is, the throttle valve 6, from the fully closed position becomes smooth.

Further, when the throttle valve 6 is rotated by the operation lever 8 to the opening degree, the throttle shaft 2, that is, the throttle valve 6 is provided with the first, second, and third return springs 19, 24, .
A spring force of 44 is acting on the closing side. Therefore, by relaxing the pulling force of the throttle wire 16, the operating lever 8 rotates in the throttle valve closing direction 20, and the throttle shaft 2 and the throttle valve 6 also rotate in the closing direction.

At this time, when the throttle valve 6 rotates to the vicinity of its fully closed position, the retainer 80 in the dashpot 56 moves into the suction chamber 5.
After the adjustment screw 69 of the forced activation lever 64 comes into contact with the contact arm 70 due to the state in which the 8 side contacts the housing 57, the dashpot 56 due to the increase in the volume of the suction chamber 58
The damping force acts on the tenth motion lever 7, acts on the throttle shaft 2 and the lost motion lever 7, and the rotational speed of the throttle shaft 2 and the throttle valve 6 toward the closing side is moderately suppressed.

In addition, when the operating lever 8 rotates in the throttle valve closing direction 20, the accelerator pedal operating amount detector 38
Let us assume a case where the detection shaft 27 connected through the two does not rotate smoothly due to a malfunction of the accelerator pedal operation amount detector 38 or the like.

In this case, the operating lever 8 rotates the 20th stroke motion lever 28 in the accelerator pedal return direction 34 while resisting the spring force of the 20th stroke motion spring 35 and separating both retaining parts 36 and 37. This allows the throttle valve 6 to be reliably rotated to the closing side.

As described above, when the throttle valve 6 is opened to a certain opening degree by operating the accelerator pedal, and the throttle valve 6 is driven to the closing side for traction control during starting and acceleration, etc., the step motor 52 is operated. Activate it. Due to the operation of the step motor 52, the throttle shaft 2 and the throttle valve 6 are activated by the spring of the tenth motion spring 23 so that the engaging portion 21 of the operation lever 8 and the engaging portion 22 of the i10 motion lever 7 are separated. It can rotate against force, and can drive the throttle valve 6 in the closing direction regardless of whether the accelerator pedal is operated.

Next, as an embodiment of the present invention, a method for detecting an abnormality in this throttle control device will be described.

In the present invention, the throttle control device includes the accelerator operation amount detector 38 that detects the rotational position of the operating lever 8 and the throttle opening degree detector 46 that detects the rotational position of the throttle shaft 2, as described above. In addition to the provision, although not shown in the drawings, there is a motor position detection device for detecting the rotational position of the throttle shaft 2, which should originally be determined in accordance with the drive pulse signal input to the step motor 52, based on the drive pulse signal. Means are provided.

Specifically, a counter or a microcomputer that counts the number of drive pulse signals input to the step motor 52 may be used as the motor position detector. In the automatic control state, that is, in the operating state of the step motor 52, if there is no step out, the rotation angle of the step motor 52 is determined according to the number of input drive pulse signals, and the rotation angle of the throttle shaft 2 is determined accordingly. This is because the rotation position should be determined. Note that the counter and the like may be reset at a predetermined reference position.

In the present invention, the output value θ of the accelerator operation amount detector 38, the output value θT11 of the throttle opening detector P46, and the output value θ of the motor position detector are compared with each other. TIIP is used to detect an abnormality in the throttle control device.

In the throttle control device shown in FIGS. 1 to 5 above,
As is clear from the above description of the device, if it is normal, the rotational position of the operating lever 8 and the rotational position of the throttle shaft 2 will match in the normal state where control such as traction control is not performed. , in a control state such as traction control, the rotational position of the throttle shaft 2 and the rotational position of the throttle shaft 2 that should originally be determined according to the drive pulse signal input to the step motor 52 match, and these positions are It should either match the rotational position of the operating lever 8 or be shifted in the closing direction.

Therefore, AP of the above output values θ , θ , θ
Tll TIIP When comparing the three, normally, if θAP-0, it is normal, and if it is not θAP-0111, it can be detected that it is abnormal. In automatic control state,
If θ - θ ≦θ, it is normal and θT11THTI
If IP AP −〇 ≦θ, it is detected that there is an abnormality THP
AP can do it.

In addition, the AP that carefully compares the output values θ , θ , θ
Tll Tl! P, it is possible to not only detect whether η1 is normal or abnormal, but also to some extent determine what kind of abnormal state it is in.

That is, in the normal state, θAP>θTll or θ
When AP<θT□, when the throttle valve 6 does not actually open, the output shaft 53 of the step motor 52, where the throttle shaft 2 is fixed to the support 1 by carbon only,
is unable to rotate or lost motion spring 23
When the throttle valve 6 actually opens, it is found that the detector 38 or 46 is abnormal. Also, in the control state, θTH−
If θTHP>θAP, it is known that the detector 38 is abnormal, and if θ−θ>θ, the motor positive T
It can be seen that there is an abnormality such as an abnormality in the HAP T) IP John detector, an abnormality in the control device of the step motor 52, or an abnormality in the step motor 52. In the control state, θT
If H-θ^Pku θT)IP, it means that the motor position detector or the control device of the step motor 52 is abnormal, and if θT11>θ^P-〇, it means that the detector 46 is abnormal. If TIIP is known and θ is less than θ −θ, then Stella Tll
It can be seen that the AP TIIP motor 52 has lost synchronization or that the detector 46 is abnormal. Also, in the control state・θ 〉θ 〉
If θ, the detector 46 or AP Tll
TIIP is an error in the motor position detector or step motor 5
2 was found to be abnormal, such as step-out, and θ 〉θ
〉θ, the detector 46 is abnormal and T)l AP
If we know that THP exists and θ 〉θ 〉θ, then AP
TIIP T)l It can be seen that there is an abnormality in the detector 46 or the motor position detector, or the step motor 52 is out of step.

Note that the comparison of the above output values θ, θ, θ is based on AP
Tll THP Actually, it may be performed using a microcomputer or the like.

In the above explanation, each output value θ θ , θA P ′
By strictly comparing T II T II P, the accelerator pedal operation amount detector 38 and the throttle opening degree detector 4
No. 6, variations in output values with respect to rotational positions were not considered at all. Therefore, as mentioned above, under normal conditions, θ - θ is normal, and θAP - 〇T11
If AP Tll is not reached, it is detected as abnormal, and in the automatic control state, if θ −θ ≦θ, it is normal and Tll is detected.
TIIP AP If θ −θθ ≦θ, it is considered abnormal.
If it were to be detected as TIIP AP, it would be detected as abnormal even though it is actually normal.

Therefore, in the present invention, even if there is a predetermined difference between the respective output values, the difference is ignored and compared. That is, specifically,
Under normal conditions, θ −θ lea is normal, and 1θAP8P
If Tll θTHl < a, it is detected as abnormal.

In the control state, 1θ - θ 1x.

Tll THP θ ≦θ 1C9θ ≦θ +d All Tll
It is only necessary to detect that it is normal when the three conditions are satisfied, and that it is abnormal when any one of the three conditions is not satisfied. However, a to d are positive constants and indicate the dead width of the detector. these are,
They are determined in consideration of variations in detection S38 and S46, respectively.

Therefore, according to the present invention, there is no risk of detecting an abnormality even though it is actually normal.

〔Effect of the invention〕

According to the present invention, an abnormality in a control valve/control device can be detected, and safety can be ensured and inconveniences avoided by issuing an alarm or taking appropriate measures based on the detection signal. Furthermore, there is no risk that the control valve control device will be detected as abnormal even though it is actually normal.

[Brief explanation of drawings]

FIGS. 1 to 5 show an example of a throttle control device that is subject to 5Z constant detection according to the present invention. FIG. 1 is a front view, and FIG. 2 is a 3 is a sectional view taken along the line mm in FIG. 2, FIG. 4 is a sectional view taken along the line II in FIG. 2, and FIG. 5 is a sectional view taken along the line V-V in FIG. 3. DESCRIPTION OF SYMBOLS 1... Support body, 2... Throttle shaft, 6... Butterfly type throttle valve, 7... Lost motion lever 8... Operation lever 9... Control lever 23...
- Lost motion spring, 38... Accelerator pedal operation 1iltEt output device, 46... Throttle opening degree detector, 52... Step motor.

Claims (1)

[Claims] An operating lever that is linked to the operation of an accelerator pedal is supported so as to be relatively rotatable on a shaft that has a control valve and is rotatably supported on a support body and is biased by a spring in the closing direction of the control valve. and a control lever that is interlocked and connected to the step motor and is fixed to the shaft so as to engage with the operating lever in response to rotation of the operating lever in the control valve closing direction. In a control valve control device in which a lost motion spring is interposed between the lost motion lever and the lost motion spring that exerts a spring force in a direction to engage the operating lever and the lost motion lever, the rotational position of the operating lever is detected. An accelerator pedal operation amount detector, an opening degree detector that detects the rotational position of the shaft, and a drive pulse signal that detects the rotational position of the shaft that should originally be determined according to the drive pulse signal input to the step motor. and a motor position detector that detects based on the above, and mutually compares the output value of the accelerator pedal operation amount detector, the output value of the opening degree detector, and the output value of the motor position detector. A method of detecting an abnormality in the control valve control device by setting a dead width based on the variation in linearity of each detector, and not detecting an abnormality if the difference between the respective output values is within the dead width. A method for detecting an abnormality in a control valve control device, characterized in that: