JPH0357852A - Control device of control valve in on-vehicle engine - Google Patents

Abstract

PURPOSE:To enhance control accuracy by returning back a motor to the reference rotational angle of a rotor and initializing the present rotor rotational angle to a value of the reference rotational angle thereafter detecting a number of motor pulses to perform a control, when a valve is opening-controlled by the step motor. CONSTITUTION:A lost motion lever 7 and an operating lever 8, interlocking to action of an accelerator, are provided in one end part of a throttle shaft 2, while a control lever 9, controlled by a step motor 52, is secured to the other end part. Here a switch (not shown), which is turned on, when a throttle valve opening is larger than the reference rotational angle of the step motor 52, and off when the opening is smaller than the reference rotational angle, is provided. When a control of the step motor 52 is required, first being based on a condition of the switch, the step motor 52 is driven till a rotor rotational angle position agrees with the reference rotational angle position, when the positions agree, the present motor rotational angle position is initialized by the reference rotational angle position, and the motor 52 is drive-controlled by grasping the number of motor pulses.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for driving a control valve with a step motor to control its opening degree.

[Conventional technology]

An example of this type of control device is a traction control device for a throttle valve in an automobile engine. This device has a step motor connected to the shaft of the throttle valve, and when a malfunction such as slipping occurs due to sudden changes in the accelerator pedal, etc., the device receives a traction control request from the electrical control unit (ECU).
In response to the TCS9 request), the step motor is driven to return the throttle opening, thereby avoiding wheel slipping.

In this device, since it is necessary to control the throttle opening independently of the accelerator pedal, an auxiliary valve driven by a pulse motor is provided separately from the throttle valve operated by the accelerator pedal, and the opening/closing operation of this auxiliary valve is Traction control was performed by

[Problem to be solved by the invention]

However, this conventional method requires two throttle valves and increases the size of the device, so a step motor is connected to the shaft of the throttle valve, and this shaft is linked with the throttle wire when the accelerator pedal is pressed. A device in which a throttle valve is moved has been proposed. In such a device,
Normally, the step motor is de-energized and is passively moved by receiving the operating force from the accelerator pedal, and the TCS
It is only when a demand arises that it is actively driven.

However, in this device, since the step motor is in an inactive state until a TCS request is received, it is not possible to grasp the exact rotational angular position of the motor rotor based on the number of pulses, and the throttle connected to the shaft The opening degree of the throttle valve is simply determined by the opening degree detector. Therefore, there is a problem in that the exact current rotational angular position of the rotor at the time the TCS request is received is not known.

Therefore, an object of the present invention is to enable more accurate opening control in a device that controls the opening of a control valve using a step motor.

[Means to solve the problem]

The present invention controls the opening degree of a control valve using a step motor, and the present invention relates to a driving means for driving the step motor in response to a control request, and a relative relationship between a rotor rotational angular position of the step motor and a predetermined reference rotor rotational angular position. When the drive means receives a control request, it first drives the step motor based on the state of the switch until the rotor rotation angle position matches the reference rotor rotation angle α position. The current rotor rotational angular position is initialized with the reference rotor rotational angular position at the point where the rotor rotational angular position coincides with that of the rotor, and the step motor is then driven while grasping the current rotor rotational angular position based on the number of pulses of the motor. A control valve control device is provided.

[Effect]

According to the above configuration, when starting the opening degree control by the step motor, first the step motor is returned to the position of the predetermined reference rotor rotation angle based on the output of the switch means, and the current rotor rotation angle is set to the reference rotor rotation angle. After initialization, the original control is executed while accurately grasping the current rotor rotation angle based on the number of pulses of the step motor.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. First, in FIGS. 1, 2, 3, and 4,
A throttle shaft 2 is rotatably supported on a throttle body 1 serving as a support via bearings 3 and 4, and an intake passage 5 formed in the throttle body 1 is connected to the throttle shaft 2 to open and close it. A butterfly type throttle valve 6 is fixed.

Both ends of the throttle shaft 2 protrude from the throttle body 1 on both sides, and a first stroke motion lever 7 is fixed to one end (the left end in FIG. 3) of the throttle shaft 2 that protrudes from the throttle body 1. At the same time, an operating lever 8 is rotatably supported. Also, the other end (third end) of the throttle shaft 2 protruding from the throttle body 1
A control lever 9 is fixed to the right end (in the figure).

At the one end of the throttle shaft 2 protruding from the throttle body 1, an engaging portion 2a having one flat surface is formed along the axis. The engaging portion 2a includes a cylindrical collar 10 whose inner end is in contact with the bearing 3, and a collar in order from the inner end, that is, the end closer to the throttle body 1, to the outer end, that is, the end that is farther from the throttle body 1. 10, a cylindrical collar 12 whose inner end is in contact with the regulation plate, and a first stroke motion lever 7 which is in contact with the outer end of the collar 12. They are mated.

A nut 13 is screwed onto the outer end of the throttle shaft 2 protruding from the first stroke motion lever 7, and a collar 10
, a restriction I211, a collar 12, and a first stroke motion lever 7 are fixed to the throttle shaft 2.

The operating lever 8 has a cylindrical portion 8 that coaxially surrounds the collar 10.
a, and a drum part 8b fixed to the outer end of the cylindrical part 8a, and the cylindrical part 8a is connected to the collar 1 through a bearing 14.
It is pivoted by 0.

Further, the axial position of the cylindrical portion 8a is regulated by a synthetic resin receiving member 15 that abuts the outer surface of the throttle body 1 and a regulating plate 11. A throttle wire 16 that is pulled and driven by a throttle operation unit such as an accelerator pedal (not shown) is wound around the drum portion 8b, and an engagement piece 17 provided at one end of the throttle wire 16 engages with the drum portion 8b1. There is. 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. Note that, as described above, the collar 10 is not fixed to the throttle body 1 but to the throttle shaft 2, and the operating lever 8 is attached to the collar 10 via the bearing 14.
Since the cylindrical portion 8a is pivotally supported, even if the bearing 14 becomes stuck, the operation lever 8 can rotate integrally with the throttle shaft 2. In other words, reliable operation of the operating lever 8 is ensured.

A cylindrical portion 8a is located between the drum portion 8b and the throttle body 1.
A coiled first return spring 19 surrounding the control lever 8 is interposed, and this first return spring 19 moves the operating lever 8 in the direction indicated by the arrow 1.
The throttle valve is energized in the throttle valve closing direction 20, which is opposite to the direction 8.

Between the operating lever 8 and the first lost motion lever 7, a first lost motion lever 7 is provided for rotating the operating lever 8.
, and the first stroke motion lever 7
A lost motion mechanism A is provided to prevent forced rotation of the throttle valve in the throttle valve closing direction 20 from affecting the operation of the operating lever 8. lost motion machine tR
A indicates engagement arm portions 21a and 2lb provided on the drum portion 8b of the operating lever 8, and an engagement arm portion provided on the first lost motion lever 7 to engage with the engagement arms 21a and 21b, respectively. 22a. 22b, and a first lost motion spring 23 interposed between the operating lever 8 and the first lost motion lever 7, and the engagement arms 21a, 22a.
are biased by the first lost motion spring 23 in the direction of mutual engagement.

Further, a second return spring 24 is interposed on the outside of the first stroke motion spring 23 to bias the operating lever 78 in the throttle valve closing direction 20.

First lost motion spring 23 and second return spring 24
is formed in a coil shape, and is disposed coaxially surrounding the collar 12 between the receiving member 25a in contact with the first stroke motion lever 7 and the receiving member 25b in contact with the regulating plate 11. There is. The receiving members 25a and 25b are the collar 1
The first strike motion spring 23 is attached to the inner cylinder of the receiving members 25a and 25b, and the second return spring 24 is attached to the receiving member 25a. , 25b, respectively. As shown in FIG. 6, the double cylindrical portions of the receiving members 25a and 25b are each formed with a plurality of notches 25a'25b' extending in the circumferential direction and in the axial direction, so that the surfaces of the inner and outer cylinders and the lost motion spring 23. Reducing the sliding resistance of the lost motion spring 23 and the second return spring 24 due to the reduction of the contact area with the m2 return spring 24, and the reduction of dust when dust gets caught in the lost motion spring 23 and the second return spring 24. Efforts are being made to ensure that there is a place for people to escape. In this embodiment, as shown in FIG. 3, the receiving members 25a and 25b are connected to the throttle shaft 2.
Although the receiving members 25a and 25b are separated in the axial direction,
may be butted against each other in the axial direction of the throttle shaft 2. By butting the two together, the lost motion spring 23,
The deformation of the second return spring 24 during operation prevents the two springs from jamming into each other.

One end 23a of the first lost motion spring 23 is engaged with the engagement arm 22a of the first lost motion lever 7, and the other end 23b is engaged with the engagement arm 21a of the drum portion 8b. Further, one end 24a of the second return spring 24 is connected to the engaging arm portion 21a.
The other end 24b is engaged with the throttle body 1.

According to such a lost motion machine tMA, when the operating lever 8 is rotated in the throttle valve opening direction 18 against the biasing forces of the first and second return springs 19 and 24 by depressing the accelerator pedal, the second 1 lost motion spring 23
The applied force causes the first lost 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, the engaging arm 21a
, 21b are engaged with the engaging arms 22a, 22b, respectively, so that the first lost motion lever 7 and the throttle shaft 2 are rotated in the throttle valve closing direction 20. As mentioned above, by providing two sets of engaging parts for the operating lever 8 and the lost motion lever 7, even if one engaging part becomes unable to engage for some reason, the operating lever 8 will be connected to the operating lever 8 by the other engaging part. The engagement of the lost motion lever 7 is ensured. In other words, the reliability of rotation of the throttle shaft 2 by the rotation operation of the operating lever 8 is improved.

A bracket 26 is fixed to the throttle body 1. A cylindrical support portion 26a having an axis parallel to the throttle shaft 2 is formed in the bracket 26, and a detection shaft 27 is rotatably supported by the cylindrical support portion 26a.

The detection shaft 27 has a second shaft connected to the operating lever 8.
A stroke motion lever 28 is rotatably supported. At the outer end of the detection shaft 27 protruding from the second stroke motion lever 28, that is, at the end/portion farthest from the throttle body 1, a small-diameter male threaded portion 27g with a substantially rectangular cross section is coaxially formed via a stepped portion 27b. has been done. Male thread part 27
A extends through two detection levers that can be engaged with the second-port stress motion lever 28 in a relatively unrotatable manner, and the detection lever 29 is tightened by tightening a nut 30 that is threaded onto a male screw 27a that protrudes from the two detection levers. The detection lever 29 is fixed to the detection shaft 27 by pressing it against the stepped portion 27b.

The second lost motion lever 28 includes a cylindrical portion 28a surrounding the detection shaft 27, and a disk portion 28b fixed to the inner end of the cylindrical portion 28a, that is, the end closer to the throttle body 1. The outer end of the support portion 26a, that is, the throttle button? The detection lever 29 is rotatably mounted on the detection shaft 27 between the end farthest from the key 1 and the detection lever 29. The disk portion 28b of the second lost motion lever 28 and the drum portion 8b of the operating lever 8 are interlocked and connected to each other via a cam mechanism B. This cam mechanism B includes a disk portion 28
An engagement pin 28b provided on an arm portion 28bl extending from the outer end side of b, that is, the end side far from the throttle body 1.
1■, and the drum part 8b to engage with the engagement pin 28b1.
The first cam 31a extends toward the outer end of the throttle body 1, that is, the end farther from the throttle body 1, and the arm portion 2 extends toward the inner end of the disc portion 28b, that is, the end closer to the throttle body 1.
The engagement pin 28b22 provided at the 8b and the engagement 2 pin 28b2. The second cam 31b extends from the inner end of the drum portion 8b, that is, the end closer to the throttle body, to engage with the second cam 31b. The cam mechanism B connects the levers 8 and 28 in order to rotate the second stroke motion lever 28 in the direction in which the accelerator pedal is depressed, as indicated by the arrow 32, in response to the rotation of the operating lever 8 in the throttle valve opening direction 18. It is something. In the cam mechanism B, unlike the case of a rod link, there is a driving joint, that is, the operating lever 8, and a driven joint, that is, the second
Since the lost motion levers 28 can be separated, a high degree of freedom can be obtained in designing the interlocking/coupling mechanism between them.

Also, two cams 31a and 31b are provided, and when the rotation angle of the operating lever 8 in the throttle valve opening direction 18 is small, the cam 31a is used, and when the rotation angle is large, the cam 31a is used.
Since the second strike motion lever 28 is rotated in the accelerator pedal depression direction 32 via the lever lb, a linear relationship between the rotation of the operating lever 8 and the rotation of the second strike motion lever 28 is ensured. Although the number of cams is two in this embodiment, by providing more cams, the linear relationship between the rotation of the operating lever 8 and the rotation of the second lost motion lever 28 can be further enhanced. .

As shown in FIGS. 1 and 2, the bracket 26 has an engagement pin 33 having an axis parallel to the cylindrical support portion 26g.
is installed between the engagement pin 33 and the detection lever 28, and a second strike motion spring 35 is interposed between the engagement pin 33 and the detection lever 28, which biases the detection lever 29 and thus the detection shaft 27 to rotate in the return direction 34 of the accelerator pedal. equipped. The second strike motion spring 35 has a coil shape that surrounds the cylindrical support portion 26a, and one end 35a thereof engages with the detection lever 29, and the other end 35a engages with the engagement pin 33. There is.

The disc portion 28b of the second lost 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 engaging portion 37 is biased in the direction of engagement with the engaging portion 36 by a second lost motion spring 35 interposed between the detection lever 29 and the engaging pin 33 .

Therefore, when the second lost motion lever 28 is rotated in the accelerator pedal depression direction 32 as the operating lever 8 is rotated in the throttle valve opening direction 18, the engaging portion 3
6 and 37, the two detection levers rotate in the accelerator pedal depression direction 32 while overcoming the biasing force of the second stroke motion spring 35, and the operating lever 8 is rotated in the throttle valve closing direction 20. Then, the two detection levers rotate in the return direction 34 of the accelerator pedal while pushing the second lost motion lever 28 under the biasing force of the second lost motion spring 35, and the amount of rotation of the operating lever 8, that is, the accelerator pedal The detection lever 29 corresponds to the amount of operation.
As a result, the detector 27 rotates. On the other hand, an accelerator pedal operation amount detector 38 is fixed to the bracket 26 facing the inner end of the detection shaft 27, that is, the end closer to the throttle body 1, and a lever 39 fixed to the inner end of the detection shaft 27 is connected to the accelerator pedal. It is connected to a manipulated variable detector 38.

The other end of the throttle shaft 2 protruding from the throttle body 1 is fixed to the throttle body 1 and pivoted to a cylindrical collar 41 whose inner end abuts the bearing 4. The control lever 9 is fixed to the protruding end of the throttle shaft 2. Also color 41
A sliding gear 43 is rotatably supported through a bearing 42 . With this structure, even if the bearing 42 is fixed, the driven gear 43 can be rotatably supported on the throttle sleeve 2. For example, when the working gear 43 is supported on the throttle shaft via a bearing, the throttle shaft and the driven gear become one body due to the fixation of the bearing, and the driven gear and other gears connected thereto resist resistance. As a result, rotation of the throttle shaft, that is, rotation of the throttle valve becomes impossible. However, with the above-described configuration, such a situation can be avoided. Furthermore, by configuring the collar 41 separately from the throttle body 1, the former can be constructed of a more appropriate material different from the latter, such as a material with high wear resistance, and even if the collar 41 is in trouble, the collar 41 Repairs can be easily performed by simply replacing parts.

A third return spring 44 is interposed between the wave gear 43 and the throttle body 1, and the engaged gear 43 is rotated in the throttle valve closing direction 18 by the third return spring 44, and the control lever 9 is engaged. In addition, driven gear 43
The outer surface, that is, the end surface on the side far from the throttle body 1, is in contact with the restriction temporary 101 fixed to the collar 41, and the wave gear 43 is urged in the axial direction by the third return spring 44, It is supported in the thrust direction by a regulating plate 101, and its axial position is regulated.

A bracket 45 is fixed to the outer surface of the throttle body 1, and a gear box 102 is constructed between the bracket 45 and the throttle body 1. There is.

A throttle opening detector 46 is supported and fixed to the bracket 45 at a position opposite to the other end of the throttle shaft 2. A fixed lever 47 is connected thereto.

Therefore, the amount of rotation of the throttle shaft 2, that is, the opening degree of the throttle valve 6 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. Four intermediate gears that mesh with the wave gears 43 are mounted on this support shaft 48, and a bearing 50 is mounted on the support shaft 48. It is rotatably supported through. A spring 51 is interposed between the intermediate gear 49 and the outer surface of the throttle body 1, and the intermediate gear 49 is urged in the axial direction by the spring 41, and the bracket 45 is supported in the thrust direction. , its axial position is regulated.

As mentioned above, the driven gear 43 meshes with the four intermediate gears.
is energized in the axial direction and supported in the thrust direction by a similar structure, and its axial position is regulated, so that play in the axial direction of both gears 43 and 49 can be prevented, and By arranging both gears 43 and 49 so that their axial positions match, both gears 43 and 49 can be reliably engaged over the entire tooth surface, thus preventing noise generation and uneven wear of the gears. be able to.

A step motor 52 as an actuator is supported and fixed to the motor support portion 45a of the bracket 45, and its output shaft 53 is supported via a bearing 103. In this way, by supporting the output shaft 53 of the step motor 52 with the bracket 45, the motor flange, which was conventionally required as a part of the step motor, can be omitted.Therefore, by reducing the number of parts, the manufacturing cost of the throttle body can be reduced. can be reduced. in this case,
The arrangement of the step motor 52 on the throttle body 1 is as follows:
This is done by sequentially assembling the components of the step motor 52 to the bracket 45.

A drive gear 54 is provided on the output shaft 53 of the step motor 52.
is fixed, and the four intermediate gears are engaged with the drive gear 54. Therefore, the output shaft 53 of the step motor 52
is connected to the throttle shaft 2 via the driving gear 54, the intermediate gear 49, the driven gear 43, and the control lever 9 engaged with the driven gear 43. That is, by operating the step motor 52 when the throttle shaft 2 is rotated by the accelerator pedal operation and the throttle valve 6 is opened to a certain opening degree, the throttle valve 6 is moved in the closing direction regardless of the accelerator position. Rotationally driven.

When the throttle valve 6 is rotationally driven in the closing direction by the operation of the step motor 52, the throttle pongee 2 resists the spring force of the first lost motion spring 23 and moves the engaging arm bracket 2.
Since the throttle wire 16 is rotated in the throttle valve closing direction 20 while separating the wires 1 and 22 from each other, the throttle wire 16 is not affected.

Further, as shown in FIG. 7, a four part 104 is provided on the outer surface of the bracket 45 at a position facing the intermediate gear 49, and this recess 104 is provided with: A of the intermediate gear 49.
An adjustment screw 105 is screwed into the recess 104, and a plug cap 106 is fitted into the recess 104 so as to cover the adjustment screw 105. The adjustment screw 105 is adjustable in forward and backward positions, and when its tip comes into contact with the intermediate gear 49 at a predetermined circumferential position, the return side stop position of the step motor 52 is regulated, and the pulse of the step motor 52 is controlled. The adjustment is made so that the relationship between the number and the rotation angle of the throttle shaft 2 is uniquely determined. With the above configuration, the step motor 5
If the stop position on the return side of step motor 2 deviates, it can be easily adjusted by simply turning the adjustment screw 105 from the outside, and the plug cap 106 protects the inside from water and dust, improving the accuracy of the step motor 52. It is possible to prevent adverse effects on durability and the like.

Further, the bracket 45 is provided with a chamber 107 vertically below the gear box 102, and this chamber 107 has first to third drain holes 108a, 108b.
and 108c, it communicates with the inside of the gear box 102, the step motor 52, and the atmosphere, respectively. With such a configuration, even if moisture in the air condenses inside the gear box 102 or the step motor 52 due to temperature changes due to the operation of the step motor 52 or the operation of the engine, this water can be removed through the drain hole. 8a and 108b to the chamber 107, and can be further discharged into the atmosphere through the drain hole 108c, appropriately preventing moisture and impurities contained therein from adversely affecting the step motor 52 and gear mechanism. can do. In addition, the presence of the channel 107 prevents water from directly entering the step motor 52 and the like from the outside. Furthermore, by setting the volume of this chamber 107 to a value commensurate with the amount of breathing inside the gearbox 102 (for example, approximately 3 minutes (7) 1 of the space volume inside the gearbox 102), the volume inside the gearbox It is possible to prevent water from being sucked into the gearbox when the gearbox gets cold and sucks in outside air, and the above effect can be obtained with a minimum chamber volume.

Furthermore, on the clay wall of bracket 45, there is Gabo Sox 102.
A ventilation hole 109 communicating with the engine is provided, and the air is released to the atmosphere through a filter (not shown) such as an air cleaner provided in the intake system of the vehicle engine. Vent hole 109
This ensures ventilation within the gearbox 102, and the filter prevents water, fuel, dust, etc. from entering through the ventilation hole 109 into the GABO sox 102 and the step motor 52 leading thereto.

Further, since the vent hole 109 functions as a vent hole during the water draining, this water draining action can be performed smoothly. In this case, if the relationship between the water drain hole 108c and the ventilation hole 109 is appropriately set, the water drain function can be performed more smoothly.

A dash port 56 is supported and fixed to the throttle body 1 to slow down the rotational movement of the first lost motorsigine lever 7 supported on the throttle shaft 2 in the throttle valve closing direction 20 near the fully opened position. ing.

This dashboard 56 is conventionally well-known.
The diaphragm 60 is supported at its periphery by the housing 57 and partitions the inside of the housing 57 into a suction chamber 58 and five atmospheric pressure chambers.
One end of a connecting port/socket 61 which movably passes through the housing 57 of the 71 and extends outward on the side of the five atmospheric pressure chambers is connected via a retainer 80 to the central portion of the housing 0. housing 5
A suction pipe 81 communicating with the suction chamber 58 is connected to 7, and this suction pipe 81 is exposed to the atmosphere via a jet 82 at its tip. Therefore, when an attempt is made to drive the connecting rod 61 to deflect the diaphragm 60 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 attached to the outer surface of the throttle body 1, and a regulation lever 63 and a forced activation lever 64 are rotatably attached to this support bolt 62. Supported. That is, between the head 62a of the support bolt 62 and the throttle body 1, the support bolts 62 are arranged in order from the head 62a side.
A cylindrical collar 65 surrounding the collar 65, a disc-shaped regulating plate 66 that abuts the inner end of the collar 65, that is, the end closer to the throttle body 1, and a disc-shaped regulating plate 66 that abuts the outer end, that is, the end far from the throttle body 1, against the regulating plate 66. Support bolt 6 so that they are in contact with each other
2, a cylindrical collar 67 surrounding the collar 67;
A regulating plate 68 interposed between the inner end of the throttle body 1 and the throttle body 1
The collar 65, the regulating plate 66, the collar 67, and the regulating plate 68 are fixed to the supporting bolt 62 by tightening the supporting bolt 62. The regulation lever 63 has a cylindrical portion 63a that coaxially surrounds the collar 65.
and a drum section 63b fixed to the outer end of the cylindrical section 63a.
Therefore, the cylindrical portion 63a is the head 62 of the support bolt 62.
It is rotatably supported by a collar 65 between a and a regulating plate 66. The forced activation lever 64 consists of a cylindrical part 64a coaxially surrounding the collar 67, and a drum part 64b fixed to the inner end of the cylindrical part 64a. It is rotatably supported by. The cylindrical portion 6381 of the forced lever 63 and the cylindrical portion 64a of the forced activation lever 64 have collars 65 and 67 at their inner and outer ends.
Dust seals 63c and 64c are disposed on the sliding surfaces of the sliding parts, respectively, to prevent holes from entering the sliding parts and to improve the reliability of the operation of the regulation lever 63 and forced activation lever 64.

The regulation lever 63 includes an adjustment screw 6 whose tip can come into contact with a contact arm 70 provided on the first stroke motion lever 7.
The adjustment screw 69 and the contact arm 70 are connected to the first stroke motion lever 7 so that the advancing and retracting positions can be adjusted.
are brought into contact with each other by rotating in the throttle valve closing direction 20. Further, the throttle body 1 has an abutting arm portion 70 when the first lost motion lever 7 rotates to a position where the throttle valve 6 is fully idle.
An adjustment screw 71 that abuts is screwed together so that the forward and backward positions can be adjusted.

The other end of the connection rod 61 of the dashpot 56 is connected to the regulation lever 63, and the connection mode is such that the first stroke motion lever 7 is in a state where the adjustment screw 69 is in contact with the contact 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 an abutment arm 72, and an adjustment screw 73 whose tip can come into contact with the abutment arm 72 is screwed into the regulation lever 63 to enable adjustment of forward and backward positions. . The contact arm portion 72 and the adjustment screw 73 are brought into contact with each other by the biasing force of a spring 74 interposed between the throttle body 1 and the forced activation lever 64. spring 7
4 generates a force that urges the first lost motion lever 7 in the throttle valve opening direction 18 via the regulation lever 63 that is in contact with the forced activation lever 64 due to the contact between the contact arm portion 72 and the adjustment screw 73. When the operating lever 8 rotates from the fully open position of the throttle valve 6 in the throttle valve opening direction 18, the regulation lever 63 and the forced activation lever 64 are rotated following the operating lever 8 by the spring 74. The retainer 80 of the dashbot 56 moves into the suction chamber 58.
When the side contacts the inner surface of the housing 57, the contact state between the adjustment screw 69 of the regulating lever 63 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 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 that forcibly rotates the first lost motion lever 7 and, in turn, the throttle shaft 2 in the throttle valve opening direction 18.

The forced activation mechanism 75 has a cam surface 76 provided on the side surface of the forced activation lever 64, and is pivotally supported by the operating lever 8 with an axis parallel to the throttle shaft 2 so as to move along the cam surface 76. It consists of a roller 77. Cam surface 76 and roller 7
7 is set so as to be in contact with each other between the position of the operation lever 8 corresponding to the fully closed position of the throttle valve 6 and the position slightly rotated in the throttle valve opening direction 18 from that position, and the cam The surface 76 is formed to rotate the forced activation lever 64 in the throttle valve opening direction 18 via the roller 77 in response to rotation of the operating lever 8 from the fully closed position to the throttle valve opening direction 18. . On the other hand, the forced activation lever 64 is rotated in the throttle valve closing direction 18 within a range in which the cam surface 76 and the roller 77 are kept in contact by a stopper 64d fixed to the outer surface of the throttle body 1. This prevents the forced activation lever from rotating too much in the throttle valve closing direction and causes the roller 77 to ride on a portion of the forced activation lever 64 other than the cam surface 76, and further improves the reliability of the operation of the forced activation lever 64. Improvements are being made.

Next, the operation of this embodiment will be explained. When the operation lever 8 is rotated in the throttle valve opening direction 18 by operating the accelerator pedal with the step motor 52 fully open and stopped, the engagement arm 21a , 2lb and 22
The first stroke motion lever 7 is activated by the engagement of a and 22b.
That is, the throttle shaft 2 is rotated in the throttle valve opening direction 18, and 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 state where it can freely rotate together with the throttle valve 6, and the control lever 9 and each gear 43, 48 are rotated in accordance with the rotational movement of the throttle valve 6 in the opening direction.
．． The rotational power is also transmitted to the step motor 52 via the step motor 53, and 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 second lost motion lever 28 via the cam mechanism B, and the engagement of the engaging portions 36 and 37 causes the detection lever 29 to move. In other words, the detection shaft 27 rotates in the accelerator pedal depression direction 32. Therefore, the amount of rotation of the throttle shaft 2, that is, the throttle opening is detected by the throttle opening detector 46, and the amount of rotation of the operating lever 8, that is, the amount of accelerator pedal operation is detected by the accelerator operation amount detector 38.
It can be detected by

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,
Simply interlocking and connecting the operating lever 8 and the first stroke motion lever 7 via the lost motion AT structure A will not provide enough starting force for the throttle shaft 2, and the initial rotational movement of the throttle shaft 2 will not be smooth. There may be cases where this is not the case. In such a case, the forced activation mechanism 75 forces the throttle shaft 2 to perform an initial rotational movement. That is, when the operating lever 8 rotates to rotate the throttle valve 6 from its fully closed position, the roller 77 comes into contact with the pressure receiving surface 76 and turns, thereby rotationally driving the forced activation lever 64, and this forced activation occurs. The rotation of the lever 64 causes the adjustment screw 7 to be attached to the contact arm 72.
3 to the regulating lever 63 that is in contact with it, and further transmitted to the first lost motion lever 7 that has an abutting arm portion 70 that comes in contact with the adjustment screw 69 of the regulating lever 63. Therefore, during the initial rotation operation of the operating lever 7, the first lost motion lever 7 is forcibly rotated,
The initial rotational movement 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 to a certain opening degree by the operation lever 8, 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 traction force of the throttle wire 16, the operating lever 8 is rotated in the throttle valve closing direction 20, and the throttle flfl2 and the throttle valve 6 are also rotated in the closing direction.

At this time, is the throttle valve 6 close to its fully closed position? When rotated, the retainer 80 moves into the suction chamber 5 in the dashbot 56.
After the adjustment screw 69 of the regulation lever 64 comes into contact with the contact arm 70, the damping force of the dashbot 56 due to the increase in the volume of the suction chamber 58 is first lost. Acting on the motion lever 7, the rotational speed of the throttle shaft 2 and the throttle valve 6 toward the closing side is moderately suppressed.

In addition, when the operation lever 8 is rotated in the throttle valve closing direction 20, the detection shaft 27 connected to the accelerator operation amount detector 38 via the lever 39 may not operate smoothly due to malfunction of the accelerator operation amount detector 38. Assume that the rotation does not occur. In this case, the cam 31a provided on the operating lever 8
Alternatively, the engagement pin 28b tt or 28b2■ provided on the 3lb and second stroke motion lever 28
The operating lever 8 can be rotated in the return direction 20 of the accelerator pedal by releasing the engagement with the throttle valve 6, and the throttle valve 6 can be reliably rotated toward 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 to be driven toward the closing side for traction control or the like, the step motor 52 is operated. This step motor 5
2, the throttle shaft 2 and the throttle valve 6
is rotated against the spring force of the first stroke motion spring 23 so that the engaging portions 21a, 2lb of the operating lever 8 and the engaging portions 22a, 22b of the first stroke motion lever 7 are separated. Therefore, the throttle valve 6 can be driven in the closing direction regardless of the operation of the accelerator pedal.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made within the scope of the invention described in the claims. Nor.

As described above, the step motor 52 is configured to interlock with the throttle shaft 2 via a gear or the like.
The opening degree of the throttle valve 6 corresponds to the rotor rotation angle of the step motor 52.

In this embodiment, as shown in FIG.
A switch associated with the throttle shaft 2 is provided so that if the throttle valve opening is larger than the opening of the throttle valve, the switch is turned on, and if the opening is smaller than the opening of the throttle valve, the switch is turned off.

For example, a magnetic switch or an optical switch can be used as this switch.

Referring to FIG. 9, the procedure for controlling the opening degree of the control valve by the step motor 52 will be described. First, the presence or absence of a TCS request is periodically checked (step S1), and when this request is received, the target value θTH of the throttle valve 6 given in conjunction with the TCS request is recognized (step S2). next,
Check ON/OFF of the above switch (step S
3) In response, the step motor 52 is driven in the direction of the reference value θT110. That is, here step motor 5
2 clockwise (CW) increases the opening, and counterclockwise (CCW) the opening decreases.
If it is N, it is driven counterclockwise, and if it is OFF, it is driven clockwise for one pulse each (steps S4, S5), and at the same time, 1 is added to the counter (steps S6, S7), and this is repeated until the switch is changed (step S10, Sll). In each cycle of this repetition, it is checked whether the value of the counter is larger than the expected value (steps S8 and S9). This expected value is the number of pulses required to reach the reference value θT110 from fully open or fully closed throttle. If the switch does not switch even though the counter value has become larger than this value, it is determined that there is an abnormality (step S12). , transition to a predetermined fail-safe operation.

When switching of the switch is detected in steps SIO and SLL, it is determined that the current value θTHP (corresponding to the rotor rotation angle of the motor) represented by the position memory value of the step motor has reached the reference opening θTIIO, and the current value Value θT}I
Initialize P to the reference value θTHO (step S
13). From this point, the original traction control starts.

First, the current value θTHP and the target value θTH are compared (step S15), and if the current value θTHP is larger, the step motor 52 is driven counterclockwise by one pulse, and 1 is subtracted from the current value θTIIP of the million counter. (Step S1
6) If the value is smaller, one pulse is driven clockwise and 1 is added to the current value θTIIP (step S17). This is repeatedly executed, and when the current value θTIIP matches the target value θTH, the step motor 52 is stopped (steps S14, S18).

In this way, no matter what position the step motor 52 is at when the TCS request is received, the predetermined reference value θ is first set.
After returning the step motor 52 to the THO position and initializing the value of the position counter to the reference value θTHO, the current opening is accurately grasped based on the number of pulses of the step motor 52 from this reference value θTHO, and the target opening is set. Since the opening degree is controlled at the same time, the target opening degree can be reached with high accuracy.

Next, with reference to FIG. 10, a procedure for checking the operation of the step motor 52, which is performed prior to starting the engine, will be described. First, it is checked whether the ignition switch is turned on (step S21), and when the ignition switch is turned on, this operation check is executed. When the ignition switch is turned on, power is supplied from the battery to many electrical components, so
First, check the battery voltage VB (step S2
2). If the battery voltage VB is lower than the specified value, the step motor 52 cannot be driven normally, so the step motor 52 is de-energized (step S23).

If the battery voltage VB exceeds the specified value, the step motor 52 is driven to return it to the reference value θTHO (steps 825 to S33). Upon returning, the current value θTHP is initialized to the reference value θT}10 (step S34). Note that the operations in steps 325 to S34 are the same as steps 83 to S12 in FIG. 9, so a description thereof will be omitted.

When the initialization of the current value θTIIP is completed, a target opening for operation check, for example O, is then set as the target value θTll (step S35).

Once the target opening degree is set, step 31 in FIG.
3 to S17, the current value θTHP is the target value θTl1
Drive the motor until it reaches (steer knobs S34 to S3)
9) When tHiIθTH is reached, the motor 52 is de-energized (step S23).

By performing the above-described operation check, it is possible to check whether the traction control is working properly before starting the engine.

The scope of application of the present invention is not limited to traction control as described above, but can be broadly applied to control of various control valves, such as choke valves.

〔Effect of the invention〕

As explained above, according to the present invention, when starting valve opening control using the steering/sopping motor, first the motor is returned to a predetermined reference rotor rotation angle and the current rotor rotation angle is initialized to the reference rotor rotation angle. After that, control is carried out while accurately grasping the current rotation angle based on the number of pulses, so it is possible to control the opening of the throttle valve etc. with high precision.

[Brief explanation of drawings]

FIG. 1 is a front view of a throttle control device according to an embodiment of the present invention, FIG. 2 is a current view of the arrow in FIG. 1, FIG. 3 is a view of the arrow in FIG. is a view in the direction of the ■ arrow in FIG. 2, FIG. 5 is a view in the direction of the V-■ arrow in FIG. 3, FIG. 6 is a partial perspective view of the receiving member 25b, and FIG. 8 is a diagram showing the characteristics of the switch provided in an embodiment of the control valve control device according to the present invention, FIG. 9 is a flow chart showing the control procedure of the control valve by the step motor in the same embodiment, and FIG. The figure is a flowchart showing the processing procedure for checking the operation of the step motor in the same embodiment. DESCRIPTION OF SYMBOLS 1... Throttle body as a support body, 2... Throttle shaft, 6... Throttle valve, 7... Lost motion lever 8... Operation lever 9... Control lever 18... Throttle valve Opening direction, 20... Throttle valve closing direction, 23... Lost motion spring,
52...Step motor as actuator, 5
6...Dashpot, 63...Regulation lever Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] A control valve control device that controls the opening degree of a control valve using a step motor, the control device including a drive means that drives the step motor in response to a control request, and a rotor rotation angular position and a predetermined reference rotor rotation angular position of the step motor. and switch means whose state is changed according to the relative relationship between the driving means and the drive means, and upon receiving the control request, the drive means first changes the rotor rotation angular position to the reference rotor rotation angular position based on the state of the switch means. Drive the step motor until they match, and at the point where they match, initialize the current rotor rotation angular position with the reference rotor rotation angular position, and then grasp the current rotor rotation angular position by the number of pulses of the step motor. A control valve control device that drives the step motor.