JPH0361655A - Detection of anomaly in controller for control valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 i of the control valve.

Such a control valve control device has, 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 is linked to an accelerator pedal operation. The operating lever is supported for relative rotation and is linked to the step motor.
A connected control lever is connected, and the control lever and the control lever are connected to each other.
A spring is provided between the lost motion lever and the lost motion lever, which is fixed to the throttle shaft so as to engage the operating lever in response to rotation of the operating lever in the throttle valve closing direction. It is equipped with a lost motion spring that exerts force.

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

[Problem to be solved by the invention]

The present invention has been made in view of such vehicle conditions, and it is an object of the present invention to provide a method capable of detecting an abnormality in a control valve control device.

[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 an accelerator pedal in response to an accelerator pedal operation. 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, An abnormality in the control valve control device is detected by comparing three output values.

[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 these three output values are compared with each other, so that the above fA
It is possible to detect an abnormality in the aI+ valve control device.

〔Example〕

Hereinafter, an example will be described in which the square 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.

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 on a support 1, and a throttle lTo 2 that is biased by a spring in the closing direction of the throttle valve 6, and a throttle lTo 2 that is operated by an accelerator pedal. An interlocking operation lever 8 is supported so as to be relatively rotatable, and a control lever 9 that is interlocked and connected to a step motor 52 serving as an actuator is connected to the operation lever 8 and the operation lever 8 in the throttle valve closing direction. A spring force is exerted in the direction of engaging the operating lever 8 and the lost motion lever 7 between the lost motion lever 7, which is fixed to the throttle shaft 2 so as to engage the operating lever 8 in accordance with the rotation of the lost motion lever 7. A lost motion spring is interposed, and the support body 1
A regulation lever 63 is supported so as to be rotatable around an axis parallel to the throttle shaft 2, and the regulation lever 63 and the lost motion lever 7 are configured to prevent lost motion when the throttle valve 6 is in a low opening range. The regulation lever 63 is connected to rotate in one direction in response to the rotation of the lever 7 in the throttle valve closing direction, and the regulation lever 63 is provided with a dash board 56 that applies a damping force to the rotation in one direction. connected.

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 10th stroke lever 7 and projects from the 10th stroke lever 7.
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 synthetic resin member 15 and a regulating plate 11 that abut against the outer surface of the slotted body 1. The drum portion 8b has a slot, not shown.
A throttle sottle wire 16 that is towed and driven by a sottle operation section is wound around the throttle wire 16, 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 rotated in the throttle valve opening direction shown by the arrow 18 in FIG. 2 by the pulling operation of the throttle wire 16 in response to the operation of the accelerator pedal. Moreover, a coil-shaped first return spring 19 that surrounds and connects the cylindrical portion 8a is interposed between the operating lever 8 and the throttle body 1, and this first return spring 19 is arranged so that the operating lever <-8
The throttle closing valve direction 20 is opposite to the arrow 18.
to assist.

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 the throttle valve closing direction of the tenth stroke motion lever 7 is provided. A lost motion mechanism 25 is provided that can prevent the rotational movement toward 20 from affecting the operating lever 8 . This lost motion mechanism 25 includes an engaging arm portion 2 that extends toward the tenth motion lever 7 and is provided on the drum portion 8b of the a working bar 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 a retaining 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 of the accelerator pedal, the second 1 lost 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 and 22, the tenth stroke motion lever 7 and the throttle shaft 2 rotate in the throttle closing valve 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 24a of the second return spring 24 is engaged with the engagement 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. A 20th stroke motion lever 28 that is interlocked and connected to the operating lever 8 is supported on the detection shaft 27 so as to be relatively rotatable, and a detection lever 29 that can be engaged with the 20th stroke motion lever 28 is supported on the detection shaft 27. Fixed.

At one end of the detection shaft 27 protruding from the cylindrical support member 26a of the bracket 26, a small-diameter male threaded portion 27a with a substantially rectangular cross-sectional shape is coaxially provided via a stepped portion 27b. 27a passes through the two detection levers, making relative rotation impossible. Moreover, the male threaded portion 27a protrudes from the detection lever 29 that is in contact with the stepped portion 27b.
A nut 30 is screwed onto the shaft 27, and by tightening the nut 30, the two detection levers are fixed to the detection shaft 27.

Further, the 20th motion lever 28 is connected to the bracket 2
6 and the outer end of the cylindrical support member 26a and the detection lever 29
The cylindrical portion 28a that surrounds the detection shaft 27 has a basically disk-shaped disk portion 28b and a control lever 8. The drum portion 8b is interlocked and connected to the drum portion 8b 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 an accelerator pedal return direction 34 opposite to the accelerator pedal depression direction 32 in response to the throttle closing valve direction 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 detecting lever 29 and the detecting lever 29 to rotationally urge the detecting lever 29, that is, the detecting shaft 27 in the return direction 34 of the accelerator pedal. The 20th strike motion spring 35 is formed into a coil shape surrounding the cylindrical support member 26a, and 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 two detection levers are provided with engaging portions 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 direction 34 of returning the accelerator pedal. The spring forces are set to act in mutually engaging directions.

Therefore, when the operation lever 8 rotates in the throttle valve opening direction 18, the 20th stroke motion lever 28 rotates in the accelerator pedal depression direction 321; this is detected by the engagement of the engaging portions 36 and 37. The lever 29 rotates in the accelerator pedal return direction 34, and the 20th stroke engine lever 28 rotates in the accelerator pedal return direction 34 as the operating lever 8 rotates in the throttle closing upward direction 20. Then, the spring force of the 20th motion spring 35 causes the detection lever 29 to rotate in the return direction 34 of the accelerator pedal, and the detection lever 29, that is, the detection shaft, rotates in response to the amount of rotation of the operating lever 8, that is, the amount of operation of the accelerator pedal. 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 a lever 39 fixed to the other end of the detection shaft 27 is 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 wave gear 43 is connected 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 . A bracket 45 fixed to the outer surface of the throttle body 1 supports and fixes a throttle opening detector 46 facing the other end of the throttle shaft 2. Lever 9
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. An intermediate gear 49 that meshes with the wave gear 43 is mounted on this support shaft 48 via a bearing 50. Rotatably supported.

Furthermore, the four intermediate gears are energized so as to be supported in the thrust direction by the bracket 45 by a spring 51 interposed between the outer surface of the throttle body 1 and the outer surface of the throttle body 1 to regulate their axial positions.

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.
9 is engaged. Therefore, the operation of the step motor 52 rotationally drives the throttle shaft 2 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 rotates in the throttle closing upward direction 20 while resisting the spring force of the tenth motion spring 23 and separating the engaging arms 21 and 22 from each other, which affects the throttle wire 16. Never.

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 dashbot 56 is conventionally well known, and includes a housing 57 having a periphery of a diaphragm 60 that partitions the interior of the housing 57 into a suction chamber 58 and an atmospheric pressure chamber 59. One end of a connecting rod 61 that movably passes through the housing 57 and extends outward on the five atmospheric pressure chamber sides 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 an attempt is made to drive the connecting rod 61 to cause the diaphragm 60 to read in a direction that increases the volume of the suction chamber 58, a force in the opposite direction to the driving direction is applied to the connecting rod 61 due to the action of the jet 82. Become.

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 a collar 67 between the regulation plates 66 and 68. supported.

The regulation lever 63 includes an adjustment screw 6 whose tip can come into contact with a contact arm 70 provided on the tenth motion lever 7.
9 are screwed together so that the forward and backward positions can be adjusted, and the relative position of the adjustment screw 69 and the contact arm 70 is determined according to the rotation of the tenth stroke motion lever 7 in the throttle closing valve direction 20. are set to abut each other. Further, the throttle body 1 has an adjustment screw 71 that is connected to the contact arm 70 when the tenth stroke motion lever 7 rotates to the position where the throttle valve 6 is fully closed. will be combined.

The other end of the connecting rod 61 in the dashpot 56 is connected to the regulating lever 63, and the connected state is such that the 910 stroke motion lever 7 is in a state where the adjusting screw 69 is in contact with the abutting arm 70. When the throttle valve is rotated in the closing direction 20, the diaphragm 60 to which the connecting rod 61 is connected is bent to increase the volume of the suction chamber 58.

The forced activation lever 64 is provided with a contact arm portion 72, and a 33 set screw 73 whose tip can be brought into contact with this contact arm portion 72.
is screwed into the regulation lever 63 so that its forward and backward positions can be adjusted. The relative positions of the abutting arm 72 and the #adjusting screw 73 are such that the abutting arm 72 abuts the adjusting 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 in the direction of contact. This spring 74 is connected to the regulation lever 6 which is in contact with the forced activation lever 64 by the contact arm portion 72 and the adjustment screw 73.
3 exerts a spring force that urges the tenth motion lever 7 in the throttle valve opening direction 18, and the operation lever 8 rotates in the throttle valve opening direction 18 from the fully closed position of the throttle valve 6. When the regulation lever 63
The forced activation lever 64 is rotated by the spring 74, and the retainer 80 of the dashpot 56 is moved into the suction chamber 58.
When the side contacts the inner surface of the housing 57, the contact state of the adjustment screw 69 and the contact arm portion 70 is released.

In FIG. 5, an operating lever 8 and a forced activation lever 6 are shown.
4, when the operation lever 8 located at the position corresponding to the fully closed 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 which forcibly rotates the tenth motion lever 7, that is, the throttle shaft 2, in the throttle valve opening direction 18 through the 10th motion lever 7, that is, the throttle shaft 2.

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 position. 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 rotation of the operating lever 8 in the throttle valve opening direction 18 from the fully closed position. Formed to move.

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 detection lever 29, ie, The detection shaft 27 rotates in the accelerator pedal depression direction 32. 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 open 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 Idl 2 will not be sufficient, 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 closed position, the lost motion lever 7 moves toward the pressure receiving surface 7.
6 and is transferred, the forced activation lever 64 is rotationally driven, and the rotation of the forced activation lever 64 is transmitted to the regulation lever 63 that is in contact with the contact arm 72 via the adjustment screw 73. The force is further transmitted to the tenth motion lever 7 which has an abutment arm 70 that abuts against the 33 set screw 69 of the regulation 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 open 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 dashbot 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.

Further, when the operating lever 8 is rotated in the throttle valve closing direction 20, the lever 3 is detected by 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 the engaging portions 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 moved by the tenth stroke motion spring 23 so that the engaging portion 21 of the operating lever 8 and the engaging portion 22 of the tenth stroke lever 7 are separated. It can be rotated against the spring force, and the throttle valve 6 can be driven in the closing direction regardless of the operation of the accelerator pedal.

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, in the throttle control 8 device, as described above, the accelerator pedal operation amount detector 38 detects the rotational position of the operating lever 8, and the throttle opening degree detector 46 detects the rotational position of the throttle shaft 2. In addition to the
Although not shown in the drawings, motor position detection means is provided 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. There is.

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 γ-stub 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 throttle shaft 2 This is because the rotation position of 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 pedal operation amount detector 38, the output value θ of the throttle opening P detector 46, 11, and the output value θ of the motor position detector are compared with each other. THP 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 should match the rotational position of the operating lever 8, or should be shifted in the closing direction.

゛Therefore, AP of the above output values θ, θ, θ
When comparing the three THTHPs, it is normally possible to detect that if θAP-○TH is normal, and if it is not θAP-○TH, it is abnormal. In the automatic control state, θ
If −θ ≦θ, it is normal and θTHTHTHP
If AP −〇 ≦θ, it is detected that there is an abnormality THP
AP can do it.

In addition, AP' which closely compares the output values θ θ and θ
By using Tll TIIP, it is possible to not only simply detect whether the device 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>θT11 or θ
When AP<θTH, 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 l with carbon or the like,
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, θT11
If -θTHP>θAP, it is known that the detector 38 is abnormal, and if θ-θ>θ, the motor positive Tl (AP THP) John detector is abnormal, the control device of the step motor 52 is abnormal. , or an abnormality such as step motor 52 stepping out.In the control state, θ
-θ less than θ, it is found that the motor position detector or the control device of the step motor 52 is abnormal, and θTH>θ^P-θ
If so, we know that the detector 46 is abnormal, TIIP, and if θ - θ, Stella Tll
AP TIIP It can be seen that the motor 52 has stepped out of step or that the detector 46 is abnormal. Also, in the control state, θ 〉θ 〉
If θ, the detector 46 or AP TOTI
IP is an abnormality 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 THAP T
HP is found, and if θ 〉θ 〉θ, then AP
T) IP Tjl detection indicates an abnormality such as an abnormality in the u46 or motor position detector, or an abnormality in the step motor 52.

Note that the comparison of the above output values θ θ and θ is based on AP'
THTHP Actually, this may be done using a microcomputer or the like.

In addition, in the above explanation, the accelerator pedal operation amount detector 3
8 and the throttle opening degree detector 46, variations in output values with respect to rotational positions were not taken into consideration at all. Therefore, as mentioned above, in the normal state, θAP-θTH
If it is normal, θAP-θ, 1! If not, it is detected as an abnormality, and in the automatic control state, θ −θ
If ≦θ, T) I THP AP is normal, and if θ1H-θTHP≦θAP, it is detected as abnormal, then it will be detected as abnormal even though it is actually normal. becomes.

Therefore, in reality, considering the above-mentioned variations, under normal conditions, it is normal if 1θAP - θTH' a.
If 1θAP-〇THl < 8, it is detected as abnormal. In the control state, 1θTH−θT11
P1<b, θT) 1≦θ^p + C*θ ≦θ +
It is desirable to detect that TIIP AP is normal when all three conditions d are satisfied, and that it is abnormal when any one of the three conditions is not satisfied.

However, a - d are positive constants, and the detectors 38 .
It is determined by taking into consideration the variations in 46, etc.

〔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.

[Brief explanation of drawings]

Figures 1 to 5 show an example of a throttle control device that is subject to abnormality detection according to the present invention. Figure 1 is a front view, and Figure 2 is a view in the direction of the ■ arrow in Figure 1. , 3rd
The figures are a cross-sectional view taken along the line ■--■ in FIG. 2, FIG. 4 is a cross-sectional view taken along the line {circle around (2)} in FIG. 2, and FIG. 5 is a cross-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 amount detector, 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 for detecting an abnormality in a control valve control device, comprising detecting an abnormality in the control valve control device.