JPH0357853A - Control device of control valve in on-vehicle engine - Google Patents

Abstract

PURPOSE:To enhance control accuracy by initializing the present rotor rotational angle to a value of the reference rotational angle to perform a motor control and reinitializing the rotational angle when valve opening shows the second reference rotational angle, in the case of controlling the opening of a control valve by a step motor. CONSTITUTION:A lost motion lever 7 and an operating lever 8, associated with 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. Now when a control of the step motor is required, first the step motor 52 is driven till a rotor rotational angle position agrees with the first reference rotational angle position, and when the positions agree, by initializing the present rotational angle position to the first reference rotational angle position, the motor 52 is drive-controlled by grasping a number of motor pulses. While during this control, when valve opening shows the second reference rotational angle set in a small opening region, the rotor rotational angle is reinitialized to the second reference rotational angle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for driving a control valve with a step motor to control the degree thereof.

[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 operates a step motor connected to the throttle valve shaft.
However, when a malfunction such as slipping occurs due to a sudden change in the accelerator pedal, etc., a traction control request (
In response to the TCS request, the step motor is driven to return the throttle opening, thereby avoiding slips and the like.

In this device, since it is necessary to control the throttle opening independently of the accelerator pedal, an auxiliary valve driven by a step motor is provided separately from the throttle valve operated by the accelerator pedal, and the opening and closing operations of this auxiliary valve provide traction control. I was trying to control it.

[Issues that Masaaki tries to solve]

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,
The step motor is normally inactive and is passively moved by receiving the operating force from the accelerator pedal.
It is only when a request is issued that it is actively driven.

However, in this device, the step motor is inactive until it receives a TCS request, so the throttle opening detector connected to the shaft can accurately determine the throttle opening based on the number of pulses. It is only detected by As a general characteristic of throttle opening detectors, this throttle opening detector performs accurate detection in a relatively small opening range, but produces a non-negligible error in a large opening range. However, since TCS requests often occur in areas with large opening degrees, D. ? There is a problem in that it is not possible to accurately determine the current opening degree, making it difficult to perform a highly difficult traction control roll.

Therefore, an object of the present invention is to enable highly 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 provides a means for driving the step motor in response to a control request, and a means for driving the step motor in response to a control request, and a means for controlling the opening-to-back rotation angle of the step motor and a predetermined first rotor rotation angle. The drive means has a switch means whose state changes depending on the relative relationship between the control valve and a means for detecting the opening degree of the control valve. The motor is driven until the first reference rotor rotation angle matches the first reference rotor rotation angle, and at that point, the current rotor rotation angle is initialized with the first reference rotor rotation angle, and then the current rotor rotation angle is set by the number of pulses of the step motor. When the output of the opening detection means indicates the second reference rotor rotation angle set within the predetermined small opening range, the current rotor rotation angle is determined. the second
Provided is a control valve control device characterized in that the control valve is re-initialized at a reference rotor rotation angle of .

[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 first reference rotor rotation angle based on the state of the switch means, and at that point the current rotor rotation angle is changed to the l-th reference rotor rotation angle. Initialize at the reference rotor rotation angle. After that, control is executed while grasping the current rotor rotation angle based on the number of pulses. During this control, when the output of the opening detection means indicates the second reference rotor rotation angle set within the predetermined small opening range, the current rotor rotation angle is reinitialized to the second reference rotor rotation angle. Therefore, since the opening degree control is executed while accurately grasping the current rotor rotation angle by the number of pulses using the highly reliable first or second reference rotor rotation angle as a starting point, high control accuracy can be obtained.

〔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 a throttle shaft 2 is provided with an intake passage 5 formed in the throttle body 1 for opening and closing. A butterfly type throttle valve 6 is fixed.

Both ends of the throttle holder 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 holder 2 protruding 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 conical collar 10 whose inner end abuts against the bearing 3 in order from its inner end, that is, the end closer to the throttle body 1, to its outer end, that is, the end farther from the throttle body 1. A disc-shaped regulation plate 11 that is in contact with the outer end of the collar 10, a cylindrical collar 12 whose inner end is in contact with the regulation plate, and a first lost motion lever 7 that 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 regulating plate 11, a collar 12, and a first stroke motion lever 7 are fixed to the throttle lever 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 8b. 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. In addition, as mentioned above, color 10
is not fixed to the throttle body 1 but to the throttle shaft 2, and the cylindrical portion 8a of the operating lever 8 is pivoted to the collar 10 via the bearing 14.
Even if the throttle shaft 2 is stuck, the operating 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 coil-shaped first return spring 19 surrounding the throttle valve is inserted, and this first return spring 19 biases the operating lever 8 in the throttle valve closing direction 20 in the opposite direction to the arrow 18.

Between the shooting lever 8 and the first strike motion lever 7, the first strike motion lever 7 is connected to the rotation of the operation lever 8.
, and the first stroke motion lever 7
A lost motion mechanism A is provided to prevent the forced rotation of the throttle valve in the throttle valve closing direction 20 from affecting the operation of the operating lever 8. Lost motion mechanism A
The engagement arms 21a and 21b provided on the drum portion 8b of the t-operating lever 8 and the engagement arms 21a and 21b provided on the first stroke motion lever 7 to engage the engagement arms 21a and 2lb, respectively. Arm portion 22a. 22b, and a first stroke motion spring 23 interposed between the operation lever 8 and the first stroke motion lever 7, and the engaging arms 21a and 22a are energized in the direction of engagement.

Further, a second return spring 24 is interposed on the outside of the first stroke motion spring 23, and biases the operating lever 8 in the throttle valve closing direction 20.

First stroke motion spring 23 and second return spring 24
is formed in a coil shape, and is disposed coaxially surrounding the collar l2 between the receiving member 25a in contact with the first lost motion lever 7 and the receiving member 25b in contact with the restriction member 11. . The receiving members 25a and 25b are the collar 1
2, and is constructed as a bottomed double cylindrical body made of resin and coaxially surrounding the first spring 23 and the receiving member 25a. 25b, and the second return spring 24 is fitted into the outer cylinders of the receiving portions +4'25a and 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 by reducing the contact area with the second return spring 24, and when dust gets caught in the lost motion spring 23 and the second return spring 24. Efforts are being made to ensure a place for dust to escape. Note that in this embodiment, the third
As shown in the figure, the receiving members 25a and 25b are separated in the axial direction of the throttle shaft 2.
5b may be butted against the axial direction of the throttle shaft 2.

By butting the two together, the lost motion spring 2
3. 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 strike motion spring 23 is engaged with the engagement arm 22a of the first strike 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 mechanism A, the 1.ψ operating lever 8 is rotated in the slot 1. When it is moved, the first stroke motion spring 2
3 causes the first loss 1 motion lever 7 to rotate in the throttle valve opening direction 18, and the throttle lever 2 to rotate in the throttle valve opening direction 18. Also, the shooting lever 8
When the throttle valve is rotated 1 and ☆ in the throttle valve closing direction, the engaging arms 21a and 2lb engage with the engaging arms 22a and 22b, respectively, thereby opening the first lost motion lever 7 and the slot nozzle φ ridge 2. is slot l-/re valve closing direction 2
Rotate to 0. As mentioned above, by arranging the engaging parts of the operating lever 8 and the lost motion lever 7 in two sets, even if one engaging part becomes unable to engage due to some kind of prisoner, the operating lever can be operated by the other engaging part. 8 and the lost motion lever 7 are secured. 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.
An opening 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 farthest from the throttle body 1, a small-diameter male threaded part 27a with a substantially rectangular cross section is formed coaxially with a stepped part 27b. has been done. Male thread part 27a
passes through two detection levers that can be engaged with the second stroke motion lever 28 in a relatively unrotatable manner, and the detection lever 2
The detection lever 29 is fixed to the detection shaft 27 by tightening the nut 30 that is mated to the male screw 27a protruding from the detection lever 29 and pressing the detection lever 29 against the stepped portion 27b.

The second stroke motion lever 28 has a detection Id+2 7
The bracket 26? Cylindrical support Tj7 part 2
6a, that is, the end far from the throttle body 1, and the two protruding levers.
is installed on. The rounded part 28b of the second stroke motion lever 28 and the drum part 8b of the operating lever 8 are interlocked and connected to each other via a cam mechanism B. This cam machine 4fi B has an arm portion 28b1 extending from the outer end side of the disc portion 28b, that is, the end side far from the throttle body 1.
The engagement pin 2 8 b 11 provided in the engagement pin 2
A first cam 31a protrudes from the outer end of the drum portion 8b, that is, the end farther from the throttle body 1, to engage with the second cam 8b1; An engagement pin 28b2 provided on the protruding arm portion 28b2. and the engagement pin 28b2. The second cam 3lb protrudes from the inner end side of the drum portion 8b, that is, the end side closer to the throttle body 1, to engage with the second cam 3lb. The cam mechanism B moves the second lost motion lever 28 in the direction indicated by the arrow 3 in response to the rotation of the operating lever 8 in the throttle valve opening direction 18.
The levers 8 and 28 are connected without rotating in the direction in which the accelerator pedal is depressed, as indicated by 2. In the case of the cam machine 1+17B, unlike in the case of a rod link, the driving joint, that is, the operating lever 8, and the driven joint, that is, the second lost motion lever 28, can be separated, so there is a high degree of freedom in designing the interlocking and connecting mechanism between them. is obtained. Also, 31a and 3
Two cams lb are provided, and when the rotation angle of the operating lever 8 in the throttle valve opening direction 18 is small, the second cam is used via the cam 3ia, and when the rotation angle is large, the second cam is transferred via the cam 31b.
Since the first lost motion lever 28 is rotated in the depression direction 32 of the accelerator pedal, a linear relationship between the rotation of the operating lever 8 and the rotation of the second lost motion lever 28 is ensured. Although the number of cams is two in this embodiment, by providing more cams, it is possible to further enhance the linear relationship between the rotation of the operating lever 8 and the rotation of the second stroke motion lever 28. can.

As shown in FIGS. 1 and 2, the bracket 26 includes an engagement pin 33 having an axis parallel to the cylindrical support portion 26a.
is installed between the engagement bottle 33 and the detection lever 28.
A second strike motion spring 35 is interposed to rotationally bias the accelerator pedal 7 in the return direction 34 of the accelerator pedal. Second
The stop motion spring 35 is formed in a coil shape surrounding the cylindrical support tjj portion 26a, one end 35a of which engages with the detection lever 29, and the other end 35a engages with the engagement pin 33.

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

Therefore, when the operating lever 8 is rotated in the throttle valve opening direction 18, the second stroke motion lever 28
When the detection lever 29 rotates in the accelerator pedal depression direction 32, the detection lever 29 rotates in the accelerator pedal depression direction 32 while overcoming the biasing force of the second stroke motion spring 35 due to the engagement of the engaging parts 36 and 37, Further, when the operation lever 8 is rotated in the throttle valve closing direction 20, the detection lever 2
9 is the second one under the force of the second strike motion spring 35.
While pressing the first motion lever 28, the accelerator pedal is rotated in the return direction 34, and the detection lever 2 is rotated in response to the amount of rotation of the operating lever 8, that is, the amount of accelerator operation.
In turn, the detection shaft 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 an accelerator pedal operation amount 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 lever 2. Also color 41
A wave gear 43 is rotatably supported via a bearing 42 . With such a configuration, even if the bearing 42 is stuck, the sliding gear 43 can be rotatably supported on the throttle shaft 2. For example, when the swing gear 43 is supported on the throttle shaft via a bearing, the throttle shaft and the wave gear become one body due to the fixation of the bearing, and the wave 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. The wave gear 43 is rotated in the throttle valve closing direction 18 by the third return spring 44, and the wave gear 43 is rotated in the throttle valve closing direction 18. 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 a regulating plate 101 fixed to the collar 41, and the wave gear 43 is energized in the axial direction by the third return spring 44. It is supported in the thrust direction by a restraining member 101, and its position in the axial direction is restricted.

A bracket 45 is fixed to the outer surface of the throttle body 1, and forms a gear box 102 between the bracket 45 and the throttle body 1, which accommodates the driven gear 43, as well as four intermediate gears and a driving gear 54, which will be described later. .

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 to the two.

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, and an intermediate gear 49 that meshes with the wave gear 43 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 wave gear 43 that 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 gear surface, thus preventing the generation of noise 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 ? dl 5 3 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 step motor 52 is disposed on the throttle body 1 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 lever 2 via a drive gear 54, an intermediate gear 49, a sliding gear 43, and a control lever 9 engaged with the sliding gear 43. That is, by operating the step motor 52 when the throttle shaft 2 is rotated by operating the accelerator pedal 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 rotated in the closing direction by the operation of the step motor 52, the throttle shaft 2 moves the engagement arm brackets 21 and 22 apart from each other against the spring force of the first lost motion spring 23. Since the throttle valve is rotated in the throttle valve closing direction 20 while rotating, the throttle wire 16 is not affected.

Further, as shown in FIG. 7, a four part 104 is provided on the outside of the bracket 45 at a position facing the intermediate gear 49, and an adjustment screw 105 of the intermediate gear 49 is screwed into this recess 104. Furthermore, the fourth part 104 has an adjustment screw 1.
A plug cap 106 is fitted to cover 05. The forward and backward positions of this cutting screw 105 are adjustable, and its tip comes into contact with the four intermediate gears at predetermined positions in the circumferential direction, thereby regulating the return side stop IL position of the step motor 52. The arrangement is made so that the relationship between the number of pulses and the rotation angle of the throttle shaft 2 is uniquely determined. Due to the above-mentioned horizontal adjustment, when the step motor 52 is stopped on the return side and placed in the horizontal position, the adjustment 10 is performed.
5 can be easily adjusted by simply turning the step motor 52 from the outside, and the plug cap 106 makes the interior waterproof and dustproof, thereby preventing adverse effects on the performance, durability, etc. of the step motor 52. I can do it.

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 and the step motor 52 due to temperature changes due to the operation of the step motor 52 or the operation of the engine, this condensation is removed through the drain holes 108a and 1. It can be introduced into the chamber 07 through the water drain hole 108b and then discharged into the atmosphere through the drain hole 108c, so that water and the impurities contained therein can be removed. This can appropriately prevent the motor from having an adverse effect on the step motor 52 and the gear mechanism. In addition, the chamber 107 prevents water from directly entering the step motor 52 and the like from the outside. Furthermore, the volume of this chamber 107 is set to a value commensurate with the breathing days within the gear box 102 (for example, the volume of the chamber 107 is
By limiting the chamber volume to about one-third of the space inside the gearbox, water can be prevented from being sucked into the gearbox when the inside of the gearbox gets cold and outside air is sucked in, and the above effect can be achieved with a minimum chamber volume. Obtainable.

The earth wall of the bracket 45 is further provided with a ventilation hole 109 that communicates with the gear box 102, and the air is released to the atmosphere through a filter (not shown) such as an air cleaner installed in the intake system of the vehicle engine. There is. The ventilation hole 109 ensures ventilation inside the gearbox 102, and prevents water, fuel, dust, etc. from entering the gearbox 102 and the step motor 52 leading thereto through the ventilation hole 109. This can be prevented with filters.

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 dimensional 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 dashpot 56 is supported and fixed on the throttle body 1 to slow down the rotational movement of the first lost motion lever 7 supported on the throttle shaft 2 in the throttle valve closing direction 20 near the fully opened position. . This dashpot 56 is conventionally known and consists of a housing 57 and a diaphragm 60 whose periphery is supported by the housing 57 and which partitions the inside 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 on the atmospheric pressure chamber 59 side and extends outward is connected to the retainer 8.
Connected via 0. A suction pipe 81 communicating with the suction chamber 58 is connected to the housing 57, 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. It turns out.

On the other hand, a support bolt 62 having an axis parallel to the throttle body 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 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 sprouting portion 62a side.
A cylindrical collar 65 surrounding the collar 65, a disc-shaped regulation plate 66 that abuts the inner end of the collar 65, that is, the end closer to the throttle body 1, and an outer end, that is, the end far from the throttle body 1, that touches the regulation plate 66. Support bolt 6 so that they are in contact with each other
2, a cylindrical collar 67 surrounding the collar 67;
The regulation bell 68 interposed between the inner end of the throttle body l and the throttle body l
The collars 65, regulating plates 66, collars 67, and regulating bells 68 are fixed to the supporting bolts 1 and 62 by tightening the supporting bolts 62. The regulation lever 63 has a cylindrical portion 63 that coaxially surrounds the collar 65.
a, and a drum portion 63 fixed to the outer end of the cylindrical portion 63a.
b, and the cylindrical portion 63a is the head 6 of the support bolt 62.
It is rotatably supported by a collar 65 between 2a 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 67. A collar 65.6 is provided at the inner and outer ends of the cylindrical portion 63a1 of the forced lever 63 and the cylindrical portion 64a of the forced activation lever 64.
Dust seals 63c. 64c is provided to prevent foreign matter from entering the sliding portion and to improve the reliability of the operation of the regulation lever 63 and forced activation lever 64.

The regulating lever 63 has a tip that can come into contact with an abutting arm 70 provided on the first stroke motion lever 7: J! 1 Adjustment screw 69 or advance/retract position! The adjusting screw 69 and the contact arm 70 come into contact with each other when the first stroke motion lever 7 rotates in the throttle valve closing direction 20. . In addition, the first stroke motion lever 7 is installed on the throttle body.
An adjustment screw 71 that comes into contact with the abutment arm 70 when the throttle valve 6 is rotated to a fully closed position is screwed into the adjustment screw 71 so that its forward and backward positions can be adjusted.

The other end of the connecting rod 61 of the dashbot 56 is connected to the regulating lever 63, and the connection mode is such that the first lost motion lever 7 is in a state where the adjusting 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 is a force that urges the first stroke 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 72 and the adjustment screw 73; When the operating lever 8 rotates from the fully closed position of the throttle valve 6 in the throttle valve opening direction 18, the regulation lever 63 and the forced activation lever 64 follow the operating lever 8 due to 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 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 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 starter groove 75 has a cam surface 76 provided on the side surface of the forced starter lever 64 and an axis parallel to the throttle shaft 2 so as to move along the cam surface 76, and is pivotally supported by the operating lever 8. and a roller 77. Cam 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 open position in the throttle valve opening direction 18 . On the other hand, the forced activation lever 64 can be rotated in the throttle valve closing direction 18 within a range where the contact between the cam 76 and the roller 77 is maintained by a stopper 64d fixed to the outer surface of the throttle body 1. This prevents the occurrence of a situation where the forced start lever turns too much in the throttle valve closing direction and the roller 77 rides on a part of the forced start lever 64 other than the cam 76, and also improves the reliability of the operation of the forced start 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 according to 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 simultaneous movement of the operating lever 8 in response to the accelerator pedal operation is transmitted to the second stroke motion lever 28 via the cam device 474B, and is transmitted to the detection lever 29 by the engagement of the engaging portions 36 and 37. That is, the detection shaft 27 rotates in the accelerator pedal depression direction 32. Therefore, the rotation amount of the throttle 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 mtA.
It can be detected by the output device 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,
Simply interlocking and connecting the operating lever 8 and the first stroke motion lever 7 via the lost motion mechanism 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 are cases. In such a case, the throttle shaft 2 is activated by the force activation mechanism 75.
The initial rotational movement is forced. That is, when the operating lever 8 rotates to rotate the throat sottle 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 is transmitted to the abutting arm 72: via the Js setting screw 73 to the regulating lever 63 that is abutting,
Further, the force is transmitted to the first stroke motion lever 7 which causes the abutment arm 70 that abuts the adjustment screw 69 of the regulation lever 63 to G. Therefore, when the operation lever 7 is first rotated, the first stroke motion 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 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 tractive force of the throttle ear 16, the operating lever 8 is rotated in the throttle valve closing direction 20, and the throttle shaft 2 and the throttle valve 6 are also rotated in the closing direction.

At this time, when the throttle valve 6 rotates to the vicinity of its fully open position, the retainer 80 is inserted into the suction chamber 5 in the dashpot 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 applied to the first port. Acting on the strike motion lever 7, the rotational speed of the throttle shaft 2 and the throttle valve 6 toward the closing side is moderately suppressed.

Furthermore, when the operation lever 8 is rotated in the throttle valve closing direction 2o, the detection ITo 27 connected to the accelerator operation amount detector 38 through three levers 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 3 provided on the operating lever 8
1a or 3 ]. The operation lever 8 can be rotated in the return direction 20 of the accelerator pedal by disengaging the engagement pin 2 8 b t t or 2 8 b 22 provided on the second stroke motion lever 28. This is possible, 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 lever 2 and the throttle valve 6 are moved into the first lost motion so that the engaging portions 21a, 21b of the operating lever 8 and the engaging portions 22a, 22b of the first lost motion lever 7 are separated. It can be rotated against the spring force of the spring 23, and 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, so the opening degree of the throttle valve 6 corresponds to the rotation angle of the rotor of the step motor 52.

In this embodiment, as shown in FIG. 8, the throttle valve opening is greater than the first reference value (corresponding to the first reference rotor rotation angle) θTll1 (for example, 30 degrees) set within a relatively large opening range. If it's big, it's ON, if it's small, it's OF
A switch associated with the slot groove f 21 is provided so that the slot number F becomes F. 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 using the step motor 52 will be explained. First, the presence or absence of a TCS request is periodically checked L (step S1), and when this request is received, the target value θT of the throttle valve 6 given from the TCS is
e+ is recognized (step S2). Next, the ON/OFF state of the switch is checked (step S3), and accordingly, the step motor 5 is moved in the direction of the first reference value θTHI.
Drive 2. That is, if the step motor 52 is driven clockwise (CW), the opening will increase, and if it is driven counter clockwise (CCW), the opening will decrease. If the switch is turned off, the field sound is driven counterclockwise, and if the field sound is OFF, it is driven clockwise by one pulse (steps S4, S5).At the same time, 1 is added to the counter (steps S6, S7), and this is repeated until the switch is changed (step 510). , S11
).

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 fully open the throttle or reach the first standard opening θTll1 from fully open. 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), the process proceeds to a predetermined fail-safe operation.

When switching of the switch is detected in steps S10 and S11, the current value (corresponding to the rotor rotation angle of the step motor) θ represented by the position memory value of the step motor
THP is the first reference value θTl! 1, and initializes the value of a position counter for managing the motor position, that is, the current value θTIIP, to the first reference opening θTll1 (S13). From this point on, the main body's traction control 1 roll starts. First, the current value θTIIP and the target value θT1{ are compared (step S15), and if the current value θTIIP is larger, the step motor 52 is driven counterclockwise by one pulse and 1 is subtracted from the current value θTIIP of the position counter. (Step S16
), if the current value θTIIP is smaller, one pulse is driven clockwise and 1 is added to the current value θTIIP (step S17). By repeating this process, the current value θTIIP is the target value θTl+
The step motor 52 is stopped when it matches (steps S14, S18).

In each cycle of this repetition, it is further checked whether the output of the throttle torque detector 46 indicates a second reference value (corresponding to the second reference rotor rotation angle) θTl12 (step S19). This second standard opening degree θT1
12 is set within a relatively small opening range where the throttle opening detector 46 has a high degree of precision. If the output of the throttle opening degree detector 46 indicates the second reference value θTII2, then the current value θTIIP is changed to the second reference value θT
112 (step S20). As a result, the current value θTHP is re-recognized more accurately, and control accuracy is further improved.

In the small opening range, even a small change in throttle opening has a large effect on the change in engine output, so improving control accuracy by re-initializing has a great advantage.

Further, since the second reference value is set within the small opening range, it is desirable to set the first reference value within the large opening range. Then, if a TCS request is received when the current opening is large, the amount of throttle return to the first reference value will be small, and the effect of this return on engine output fluctuations and the power consumption of the motor for returning the throttle will be reduced. There is an advantage that it can be reduced.

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

〔Effect of the invention〕

As explained above, according to the present invention, when starting the valve opening control using the stepping motor, the motor is first returned to the first reference rotor rotation angle, and the current rotor rotation angle is set to the first reference rotor rotation angle. After initializing to the rotation angle, control is performed while accurately grasping the current rotor rotation angle based on the number of pulses, and during this control, the output of the throttle opening detector is adjusted to the second position within the small opening range. When the reference rotation angle is indicated, the current rotor rotation angle is re-initialized to the second reference rotor rotation angle so that the current rotor rotation angle can be grasped even more accurately. This makes it possible to control the opening of throttle valves, etc. with a high degree of control.

[Brief explanation of drawings]

Fig. 1 is a front view of a throttle control device according to a length embodiment of the present invention, Fig. 2 is a view taken along the arrow ■ in Fig. 1, Fig. 3 is a view taken along the line The figure is a view from the ■ arrow in FIG. 2, FIG. 5 is a view from the v-■ arrow in FIG. 3, FIG. 6 is a partial perspective view of the receiving member 25b, and FIG. A cross-sectional view, FIG. 8 is a diagram showing the characteristics of a switch provided in an embodiment of the control valve control device according to the present invention, and FIG. 9 is a flowchart showing the control procedure of the control valve by the step motor in the same embodiment. .

Claims (1)

[Claims] A control valve control device that controls the opening degree of a control valve using a step motor, the device comprising means for driving the step motor in response to a control request, and a rotor rotation angle of the step motor and a predetermined first reference rotor rotation angle. and an opening detection means for detecting the opening degree of the control valve, and upon receiving the control request, the drive means first changes the state of the switch means. Drive the step motor until the rotor rotation angle and the first reference rotor rotation angle match based on the above, and at the point where they match, initialize the current rotor rotation angle with the first reference rotor rotation angle, and then , controlling the drive of the step motor while grasping the current rotor rotation angle based on the number of pulses of the motor; and during this control, the output of the opening detection means is set within a predetermined small opening range.
1. A control valve control device characterized in that when the reference rotor rotation angle indicates the second reference rotor rotation angle, the current rotor rotation angle is re-initialized with the second reference rotor rotation angle.