JPH07189760A - Throttle control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable the appropriate position control of an actuator without providing a detector for detecting the rotating position of the actuator. CONSTITUTION:When a traction control demand signal is outputted, in the case of the target opening theta being smaller than the operating quantity ACC of an accelerator pedal 21, a throttle valve 3 is driven in the opening direction by such output as to reduce the speed of the throttle valve opening TVO until the opening TVO of the throttle valve 3 becomes smaller than the operating quantity ACC of the accelerator pedal 21, and then feedback-controlled. When the target opening theta becomes larger than the operating quantity ACC of the accelerator pedal 21 and even when feedback control is stopped, the output of a step motor 41 is held to such output that an actuator interlocking member 44 and an engaging lever 4 are slightly engaged with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle control device for an internal combustion engine, and more particularly to a throttle control device for driving a throttle valve by accelerator operation as well as a throttle actuator such as a step motor. Is.

[0002]

2. Description of the Related Art In order to prevent the vehicle from swaying laterally due to wheel slippage during acceleration of a vehicle on an icy road or a snowy road, a second throttle valve connected in series with a first throttle valve that works in conjunction with an accelerator pedal. The traction control request signal is issued when the slip condition is detected, that is, when the slip condition is detected by determining the difference between the rotational speed of the driving wheel detected by the wheel rotational speed and the rotational speed of the driven wheel. It has been proposed to provide a device (hereinafter referred to as a traction control device) that controls the second throttle valve to the closing side to reduce the torque of the engine and thereby reduce the driving force.

By the way, it is desired that the traction control device is small and lightweight, but if the traction control device is provided with the independent throttle valves in series, the device becomes large. Therefore, a single control valve is used, and in the normal state, the opening of the control valve can be determined by operating the accelerator pedal, and in the traction operating state, regardless of the operation of the accelerator pedal, There is a throttle control device that can automatically control the opening of a control valve (see Japanese Patent Laid-Open No. 3-61654, etc.).

That is, an operating lever which has a butterfly type throttle valve and which is rotatably supported by a support body and which is spring-biased in the closing direction of the throttle valve is provided with an operating lever which is interlocked with the operation of an accelerator pedal. A control lever, which is rotatably supported relative to the actuator and is interlocked with and linked to an actuator, is connected to the operation lever and to engage the operation lever according to the rotation of the operation lever in the throttle valve closing direction. A lost motion spring that exerts a spring force in a direction to engage the operation lever and the lost motion lever is provided between the lost motion lever fixed to the throttle shaft and the turning position of the operation lever. Slot equipped with an accelerator pedal operation amount detector for detecting the throttle opening and a throttle opening detector for detecting the rotational position of the throttle shaft A control device.

[0005]

However, in the throttle control device having such a structure, the actuator pushes the operating lever in one direction,
Since the actuator and the operating lever are interlocked and connected, the rotational position of the actuator is not directly detected. Therefore, when the throttle valve opening is equal to the opening operated only by operating the accelerator pedal under the traction operation condition, that is, the rotational position of the actuator is detected by the throttle opening detector. If the rotation position is larger than the rotation position in the opening direction, the rotation position of the actuator cannot be grasped. If a detector for detecting the rotational position of the actuator is provided, the cost will increase. Therefore, in this case, the actuator is held in the fully open position, and the control responsiveness when the operating lever is linked by the actuator again becomes poor, or the actuator is fully opened each time the operating lever is linked. Since it rotates from the position and comes into contact with the operation lever, there is a fear that abnormal noise may be generated or parts may be worn.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to perform appropriate position control of the actuator without providing a detector for detecting the rotational position of the actuator, and at low cost, further Aims to provide a highly reliable throttle control device for an internal combustion engine.

[0007]

Therefore, the throttle control device for an internal combustion engine according to the present invention has, as a first technical means, an accelerator operation system for opening and closing a throttle valve via an elastic member by an accelerator operation, The throttle valve is engaged only in the direction of closing the throttle valve, and is driven by an actuator under a predetermined traction operating condition to move the throttle valve to a target opening against the biasing force of the elastic member of the accelerator operation system. In a throttle control device for an internal combustion engine having a traction control system forcibly closed, an accelerator operation amount detection means for detecting an accelerator operation amount in an accelerator operation, a throttle opening degree detection means for detecting an opening degree of a throttle valve, The output value corresponding to the accelerator operation amount of the accelerator operation amount detecting means and the throttle value of the throttle opening detecting means. A comparison means for comparing an output value corresponding to the opening degree of the throttle valve with the traction control system, and the traction control system outputs an output value corresponding to the opening degree of the throttle valve by the comparison means under the traction operating condition. Actuator predetermined output driving means for driving the actuator in the throttle valve closing direction with a predetermined output when it is determined that the output value corresponds to the output value corresponding to When it is determined that the value becomes smaller than the output value corresponding to the accelerator operation amount, actuator feedback control means for starting the feedback control of the actuator so as to approach the target opening degree is provided.

As a second technical means, when the throttle valve opening becomes smaller than a target opening during the feedback control, the traction control system
The actuator is provided with a holding output in the closing direction such that the throttle valve maintains an opening degree operated only by the accelerator operation system and the traction control system follows while engaging with the throttle valve.

As a third technical means, the traction control system stops applying the holding output in the closing direction when the traction operation condition is completed.

[0010]

When the accelerator operation system is operated in the opening direction of the throttle valve, the throttle valve is rotated in the opening direction via the elastic member. That is, the throttle valve is rotated in the opening direction while the elastic member is also biased in the opening direction. Then, under a predetermined traction operating condition, the traction control system forcibly closes the throttle valve to the target opening against the biasing force of the elastic member of the accelerator operating system.
The actuator is driven.

According to the first technical means, since the traction control system has the actuator predetermined output driving means, the output value corresponding to the throttle valve opening is set as the accelerator operation amount by the comparing means. When it is determined that the output value matches the corresponding output value, for example, a predetermined output that makes the speed of the throttle valve opening smaller than the speed of the throttle valve opening after the traction system is engaged with the throttle valve. Then, the actuator is driven in the throttle valve closing direction (hereinafter referred to as initial closing drive control).

Therefore, the initial closing drive control of the actuator predetermined output drive means causes the traction control system to output a predetermined output of the actuator until the throttle valve opening becomes smaller than the opening operated only by the accelerator operation system. Driven in the direction of closing the throttle valve. That is, until the traction control system engages with the throttle valve, the traction control system uses an actuator to adjust the throttle valve opening degree from the speed of the throttle valve opening degree after the traction system engages with the throttle valve. It is driven in the direction of closing the throttle valve with an output that reduces the speed.

The traction control system engages with the throttle valve when the throttle valve opening becomes equal to or smaller than the opening operated only by the accelerator operating system. At this time, the traction system engages with the throttle valve in a state where the speed is lower, so that the impact or the like at the time of the engagement is reduced. Here, the traction control system further has an actuator feedback control means, and when it is determined by the comparison means that the output value corresponding to the throttle valve opening becomes smaller than the output value corresponding to the accelerator operation amount, Feedback control of the actuator is started so as to approach the target opening.

By this feedback control, the throttle valve is forcibly closed to the target opening against the biasing force of the elastic member of the accelerator operating system, and the throttle valve opening becomes the target opening. By the way, even during the feedback control, since the traction control system is engaged with the throttle valve only in the direction of closing the throttle valve, when the throttle valve opening becomes smaller than the target opening. Therefore, the engagement is not performed.

According to the second technical means, when the throttle valve opening becomes smaller than the target opening during the feedback control, the traction control system causes the actuator to operate the throttle valve. The opening degree operated only by the accelerator operation system is maintained, and the holding output in the closing direction is provided so as to follow while engaging with the throttle valve (hereinafter referred to as holding control).

Therefore, in the holding control, the output of the actuator is such that the throttle valve is maintained at the opening that is operated only by the accelerator operation system. Therefore, during the feedback control, the throttle valve opening is controlled. When it becomes smaller than the target opening, the throttle valve rotates only following the operation of the accelerator pedal. Further, since the output of the actuator is so large as to follow the throttle valve while being engaged, the traction control system not only engages the throttle valve in the direction of closing the throttle valve, The actuator also follows the throttle valve in the opening direction, and the actuator does not rotate largely in the throttle valve opening direction.

Further, according to the third technical means, when the traction operation condition is finished and the application of the target opening is finished, the rotation control means stops the application of the holding output. The actuator has, for example, a fully open opening.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. This embodiment is an example in which the control device of the present invention is applied to the control of a butterfly type throttle valve which is a control valve in a throttle control device of an automobile. FIG. 1 shows a system configuration according to an embodiment, but in the drawing, rotation of each axis is shown as movement in the left-right direction in the drawing.

A butterfly type throttle valve 3 is fixed to the throttle shaft 2 and is rotatably supported by a support body such as a throttle body (not shown). An accelerator drum shaft 22 having an axis parallel to the throttle shaft 2 is pivotally supported by the throttle body, and the accelerator drum shaft 22 is connected to the periphery of the accelerator drum shaft 22 in association with the operation of the accelerator pedal 21. An accelerator drum 24 for rotating the is supported. Further, the accelerator drum 24 has a locking lever.
An accelerator lever 25 having 26 is integrally molded,
Further, the accelerator drum 24 and the accelerator lever 25 are biased by springs 28 and 29 in the non-operating direction of the accelerator pedal 21, that is, in the closing direction of the throttle valve 3, respectively.

Further, a step motor as an actuator having an output shaft 42 parallel to the throttle shaft 2 is provided in the throttle body 9 near the shaft end 2b of the throttle shaft 2.
41 are supported. An actuator interlocking member 44 interlocking with the step motor 41 is provided. The actuator interlocking member 44 is elastically biased in the opening direction of the throttle valve 3 by the first spring 43 having a first predetermined biasing force.

The actuator interlocking member 44 is
Engagement lever 4 provided on the shaft end 2b of the throttle shaft 2
To engage the throttle shaft 2 in only one direction.
Is rotated only in the closing direction of the throttle valve 3. Here, when the step motor 41 is not driven and controlled, the actuator interlocking member 44 is stopped at the fully open position of the step motor 41 by the first predetermined biasing force of the first spring 43.

Further, the throttle shaft 2 near the shaft end 2a
Is normally pulled by a locking lever 26 and a lost motion spring 32.
When the throttle shaft 2 rotates in the opening direction of the throttle valve, the lost motion lever 31 that rotates independently of the accelerator lever 25 and disengages from the accelerator lever 25 It is provided.

That is, when the accelerator drum 24 rotates in the opening direction of the throttle valve 3, the lost motion lever 31 is engaged with the accelerator lever 25 by the tension urging force of the lost motion spring 32. Together with the accelerator lever 25, it rotates in the throttle valve opening direction. On the other hand, when the step motor 41 rotates in the closing direction of the throttle valve 3 while the accelerator drum 24 is fixed at a constant opening, the actuator interlocking member 44 rotates the throttle shaft 2 only in the closing direction of the throttle valve 3. The throttle shaft 2 rotates in the closing direction of the throttle valve 3, and the lost motion lever 31 rotates in the closing direction of the throttle valve 3 against the pulling force of the lost motion spring 32. . Accordingly, the engagement between the lost motion lever 31 and the accelerator lever 25 is released, and the throttle shaft 2 is closed so that only the throttle valve 3 is closed while the position of the accelerator drum 24 remains the same.
Rotates.

The tension urging force of the lost motion spring 32 is larger than the first predetermined urging force of the first spring 43. Further, in this embodiment, the throttle opening detector 71 is supported and fixed to the throttle body or the like near the shaft end 2b of the throttle shaft 2,
The amount of rotation of the engagement lever 4, that is, the opening of the throttle valve 3, which is a control valve, is detected by the throttle opening detector 71. That is, the throttle opening detector 71 has a function as throttle opening detection means for detecting the opening of the throttle valve 3.

Further, an accelerator opening detector 75 is provided,
The amount of rotation of the accelerator drum 24, that is, the amount of operation of the accelerator pedal 21 is detected, and thus the accelerator opening detector 75
Has a function as accelerator operation amount detecting means.
In the throttle control device for the internal combustion engine having the above configuration, the control unit 80 performs the throttle control based on the detected opening amounts of the throttle opening detector 71 and the accelerator opening detector 75.

The routine used in such throttle control will be described below with reference to FIG. In step (denoted as S in the drawing; the same applies hereinafter) 1, it is determined whether the slip state of the vehicle is detected, the traction operation condition is established, a traction control request signal is issued, and the target opening θ is set.

When the target opening θ is set under the traction operation condition, since a predetermined slip has occurred, the throttle valve 3 is rotated in the closing direction to reduce the output of the engine, so-called traction. Assuming that the control request signal has been issued, the process proceeds to step 2. In step 2, the set target opening θ is compared with the current operation amount ACC of the accelerator pedal 21 detected by the accelerator opening detector 75, and the target opening θ is smaller than the operation amount ACC of the accelerator pedal 21. In this case (θ <ACC), the slip state is detected, and it is determined that the operation state requires traction control, and the process proceeds to step 3.

In step 3, the throttle opening detector 71
The present opening degree TVO of the throttle valve 3 detected by the above is compared with the present operation amount ACC of the accelerator pedal 21 detected by the accelerator opening detector 75, and the opening degree TVO of the throttle valve 3 is determined by the accelerator pedal 21. When it is equal to the manipulated variable ACC (TVO = ACC), the slip state is detected, and the traction control by the step motor 41 is not yet performed despite the operating state in which the traction control needs to be performed. It is determined that Then, the routine proceeds to step 4, where the step motor 41 is output such that the speed of the throttle valve opening TVO is smaller than the opening speed of the opening of the throttle valve 3 after the actuator interlocking member 44 is engaged with the engagement lever 4. Then, the throttle valve 3 is driven in the direction to close it.

By driving the step motor 41 in the closing direction of the throttle valve 3, the actuator interlocking member 44 moves so as to engage with the engagement lever 4 (A in FIG. 3).
section). When the actuator interlocking member 44 engages the engaging lever 4 against the elastic biasing force of the first spring 43, the throttle valve 3 is rotated so as to be closed (to reach the target opening θ). To be made.

At this time, the step motor 41 is output such that the speed of the throttle valve opening TVO is smaller than the opening speed of the opening of the throttle valve 3 after the actuator interlocking member 44 is engaged with the engagement lever 4. As it is, since the above-mentioned engagement is performed, the impact or the like at the time of the engagement is reduced. That is, step 3 has the function of the comparing means, and step 4 has the function of the actuator predetermined output driving means.

When the step motor 41 rotates the throttle valve 3 in the closing direction, the lost motion lever 31 rotates in the closing direction of the throttle valve 3 against the pulling force of the lost motion spring 32. Accordingly, the engagement with the accelerator lever 25 is released, and the throttle shaft 2 is rotated so that only the throttle valve 3 is closed while the position of the accelerator drum 24 remains unchanged.

When the opening TVO of the throttle valve 3 becomes less than the operation amount ACC of the accelerator pedal 21 (TV
When O <ACC), the traction control by the step motor 41 is performed, so the throttle valve 3
The opening TVO is less than the operation amount ACC of the accelerator pedal 21. At this time, the current opening TVO of the throttle valve 3 detected by the throttle opening detector 71 coincides with the current rotation position of the step motor 41, so the routine proceeds to step 5, where the throttle opening detector is Based on the value detected by 71, the feedback control of the step motor 41 is started.

In this feedback control, the step motor 41 closes the throttle valve 3 and the first predetermined biasing force of the lost motion spring 32 and the first spring 43 opens the throttle valve 3 (FIG. B section in 3). That is, step 5 has the function of the actuator feedback control means.

On the other hand, in step 2, when the target opening θ becomes equal to or larger than the operation amount ACC of the accelerator pedal 21 (θ
≧ ACC), the throttle shaft 2 will not move to the accelerator pedal 21 even in an operating state where traction control is required.
Since the rotation amount is smaller than the target opening degree θ following the operation amount ACC of, the opening degree of the throttle valve 3 does not change even if the step motor 41 is feedback-controlled. Therefore, the feedback control of the step motor 41 is stopped and the process proceeds to step 6.

In step 6, the output of the step motor 41 is maintained at an output smaller than the predetermined urging force of the lost motion spring 32 and larger than the predetermined urging force of the first spring 43 (section C in FIG. 3). The operation of controlling the step motor 41 to such an output will be described. That is, since the output of the step motor 41 is smaller than the predetermined biasing force of the lost motion spring 32, the lost motion lever 31 is biased by the accelerator lever 25, and the lost motion lever 31 is integrated with the accelerator lever 25. Thus, the throttle shaft 2 also rotates following the operation of the accelerator pedal 21.

Further, since the output of the step motor 41 is larger than the predetermined biasing force of the first spring 43, the actuator interlocking member 44 and the engaging lever 4 remain engaged. However, since the output of the step motor 41 is smaller than the predetermined urging force of the lost motion spring 32, the lost motion lever 31 is not separated from the accelerator lever 25, so that the actuator interlocking member 44 is attached in the opening direction of the throttle valve 3. It is not urged, and accordingly, the step motor 41 does not rotate largely in the throttle valve opening direction.

That is, the step motor 41 is in a state of producing an output such that the actuator interlocking member 44 and the engagement lever 4 are slightly in contact and held. On the other hand, if the target opening θ is not set in step 1, it means that the driver has canceled the traction control request signal, and the process proceeds to step 7.

In step 7, the output of the step motor 41 is stopped from being maintained at an output smaller than the predetermined urging force of the lost motion spring 32 and larger than the predetermined urging force of the first spring 43, and the control of the step motor 41 is stopped. To cancel. As a result, the actuator interlocking member 44 is in the fully open position due to the predetermined biasing force of the first spring 43 (section D in FIG. 3).

That is, as described above, according to this embodiment, when the traction operation state is established, the step motor is
Reference numeral 41 indicates the current throttle valve which is rotated in the throttle valve closing direction with a predetermined output until the opening TVO of the throttle valve 3 becomes less than the operation amount ACC of the accelerator pedal 21 and then detected by the throttle opening detector 71. Feedback control is performed based on the opening degree TVO of 3. Even after the feedback control is no longer necessary, the accelerator pedal 21 is held at a position that does not affect the operation amount ACC, so that, for example, operating conditions for performing feedback control and operating conditions for not performing feedback control continue. Even when
The control response and the like when the feedback control is performed by the step motor 41 again does not deteriorate. Further, no abnormal noise is generated due to the contact between the actuator interlocking member 44 and the engagement lever 4, and no abnormal noise is generated at the time of contact between the lost motion lever 31 and the accelerator lever 25. It is possible to reduce wear and the like, and it is possible to improve the life and reliability of the device. In addition, overshoot and the like that excessively drive the throttle valve 3 in the valve closing direction can be reduced, and controllability is improved.

[0040]

As described above, according to the present invention,
When the throttle valve opening is equal to the opening operated only by the accelerator operation system under the traction operating condition, the actuator is driven in the throttle valve closing direction with a predetermined output, and then the throttle valve is controlled by the feedback control as described above. When the traction system engages with the throttle valve by forcibly closing the throttle valve opening to the target opening with a predetermined output against the biasing force of the elastic member of the accelerator operation system It is possible to reduce impacts and overshoots that drive the throttle valve in the closing direction too much, thus improving the marketability.

Further, when the throttle valve opening becomes smaller than the target opening during the feedback control, the output of the actuator is made to follow while engaging with the throttle valve, and the throttle valve is set to the accelerator pedal. Since the control is performed such that the size is such that the throttle valve is rotated following only the operation of, the traction control system not only engages the throttle valve in the direction of closing the throttle valve, but also operates the throttle valve. The actuator will follow the valve opening direction while being engaged, the actuator will not rotate largely in the throttle valve opening direction, and a detector for detecting the rotational position of the actuator will not be provided. Appropriate position control is possible.

Therefore, the traction control system can suppress the generation of abnormal noise at the start of traction and also can reduce the cost. Furthermore, there are effects that the number of parts is small, the adjustment of the parts is easy, and the reliability of the apparatus is high.

[Brief description of drawings]

FIG. 1 is an overall system diagram of a throttle control device showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the contents of throttle control according to the embodiment.

FIG. 3 is a time chart explaining the operation of throttle control according to the embodiment.

[Explanation of symbols]

 2 Throttle shaft 3 Throttle valve 21 Accelerator pedal 24 Accelerator drum 25 Accelerator drum 25 Accelerator lever 31 Lost motion lever 32 Lost motion spring 41 Step motor 43 First spring 44 Actuator interlocking member 71 Throttle opening detector 75 Accelerator opening detector 80 Control unit

Claims (3)

[Claims] 1. An accelerator operating system for opening and closing a throttle valve via an elastic member by an accelerator operation, and an accelerator operating system engaged with the throttle valve only in a direction for closing the throttle valve, and driven by an actuator under a predetermined traction operating condition. A throttle control device for an internal combustion engine having a traction control system forcibly closing the throttle valve to the target opening against the biasing force of the elastic member of the accelerator operation system, detects the accelerator operation amount in the accelerator operation. Accelerator operation amount detecting means, throttle opening detecting means for detecting the opening of the throttle valve, an output value corresponding to the accelerator operation amount of the accelerator operation amount detecting means, and opening of the throttle valve of the throttle opening detecting means. And a comparison means for comparing the output value corresponding to the degree with the traction control system. When it is determined by the comparison means that the output value corresponding to the throttle valve opening degree matches the output value corresponding to the accelerator operation amount under the traction operation condition, the actuator is operated in the throttle valve closing direction with a predetermined output. When the output value corresponding to the throttle valve opening is determined to be smaller than the output value corresponding to the accelerator operation amount by the actuator predetermined output driving means to be driven to, and the comparing means, the target opening degree is brought closer. A throttle control device for an internal combustion engine, comprising: actuator feedback control means for starting feedback control of an actuator. 2. When the throttle valve opening becomes smaller than a target opening during the feedback control, the traction control system maintains an opening at which the actuator is operated and the throttle valve is operated only by an accelerator operation system. 2. The throttle control device for an internal combustion engine according to claim 1, wherein the traction control system provides a holding output in the closing direction so as to follow while engaging with the throttle valve. 3. The throttle control device for an internal combustion engine according to claim 2, wherein the traction control system stops giving the holding output in the closing direction when the traction operation condition ends.