JPH06167262A - Controller for idle adjusting valve of engine - Google Patents

Abstract

PURPOSE:To commonly use a driving mechanism for an electrical throttle (throttle valve controller) and an ISC (idle revolution speed control) bypass valve. CONSTITUTION:The first member 6 interlocked with an accelerator 5 is urged in the accelerator return direction by the first spring 7, and the second member 8 interlocked with a throttle valve 2 can be shifted between a regulation part 6a and a limitter 9. Further, the third member 11 is connected with a motor 10, and the fourth member 12 is installed between the second and the third members 8 and 11. The second spring 13 for allowing the second member 8 to follow in the throttle valve closing direction of the third member 11 through the fourth member 12, the third spring 14 for urging the third member 11 in the throttle valve opening direction, and the fourth spring 15 for allowing the second member 8 to follow the operation of the fourth member 12 in the throttle valve opening direction are provided. Further, the fifth member 16 for the contact in the throttle valve opening direction with the third member 11 and the fifth spring 17 for urging the fifth member 16 in the throttle valve opening direction are installed, and a bypass valve 4 is connected with the fifith member 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine idle adjusting valve control device for controlling a bypass valve provided in a bypass passage bypassing a throttle valve electrically controlled by a motor.

[0002]

2. Description of the Related Art In a vehicle engine, a bypass passage for bypassing a throttle valve is provided in the intake passage so that the intake air amount can be adjusted in response to load fluctuations during idling to control the engine rotation speed to a predetermined idle rotation speed. Many of them are provided with an ISC (idle speed control) device that controls bypass air by opening and closing a bypass valve provided in the bypass passage. It is also known in the art to adjust the intake air amount during idling by the throttle valve itself to control the idling speed. Such idle speed control by controlling the throttle valve is an electrically controlled throttle valve control device (hereinafter referred to as an electric throttle) driven by a motor as disclosed in, for example, JP-A-64-41625. Can be implemented in an engine having In addition, apart from that, in the electric throttle, it is necessary to have a fail-safe function when a failure occurs in the motor or the controller that controls the motor. Therefore, in the case of an electric throttle, for example, as disclosed in Japanese Patent Laid-Open No. 64-41625, a control system is configured to disconnect the electromagnetic clutch and disconnect the drive unit when the motor or the like fails.
In addition, there has been proposed a device which is mechanically fail-safe without relying on an electrical control signal. That is, in the throttle valve control device proposed by the present applicant disclosed in Japanese Patent Laid-Open No. 4-111022, a first member that interlocks with the accelerator, and a return spring that biases the first member in the accelerator return direction, Between the first regulating position, which is interlocked with the throttle valve and contacts the regulating portion of the first member to regulate the maximum opening of the throttle valve, and the second regulating position, which contacts the limiter to regulate the minimum opening of the throttle valve. A movable second member, a third member that acts on the second member in the throttle valve opening direction, and a second member that elastically acts on the third member in the throttle valve closing direction of the third member. An electric throttle is provided that includes a rod spring that causes the second member to follow the operation of the second member, a motor that drives the third member, and a motor spring that biases the third member in the throttle valve opening direction. It is mechanically connectable to a second member which is operatively connected to the first member and the throttle valve interlocked to the accelerator when the failure occurs by.

[0003]

The delicate adjustment of the intake air amount for idle speed control by the throttle valve itself requires delicate and highly accurate control of the motor.
The control becomes too complicated and practically difficult to implement. Therefore, the idling speed control by adjusting the intake air amount is generally performed by ISC by bypass air control. In that case, in an engine equipped with an electric throttle, in addition to a drive mechanism such as a motor for the electric throttle, ISC It is necessary to provide a drive mechanism such as a solenoid for driving the bypass valve, which makes the idle control system including the throttle valve complicated as a whole, occupies a large space, and is expensive.

The present invention has been made in view of the above problems, and simplifies, downsizes, and reduces the idle control system by sharing an electric throttle and a drive mechanism of a bypass valve for idle speed control. The purpose is to realize cost reduction.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an idle adjusting valve control device for controlling an idle adjusting valve including a bypass valve provided in a bypass passage for bypassing a throttle valve provided in an intake passage, and more particularly to A throttle valve and a bypass valve can both be operated with high precision by a motor, and the configuration is such that a first member that interlocks with the accelerator and the first member are urged in the accelerator return direction. A first spring and a first regulating position which is interlocked with the throttle valve and contacts the regulating portion of the first member to regulate the maximum opening of the throttle valve, and a second regulation which contacts the limiter to regulate the minimum opening of the throttle valve. A second member movable between the second position, a third member that acts on the second member in the throttle valve opening direction, and a second member that elastically acts on the third member. A second spring that causes the second member to follow the operation of the material in the throttle valve closing direction, a motor that drives the third member, a third spring that biases the third member in the throttle valve opening direction, and a second member Is provided with an idle adjusting valve drive mechanism that opens and closes the bypass valve in conjunction with the operation of the third member in the throttle valve closing direction by the motor in the state of being in contact with the limiter.

Further, in the idle adjusting valve control device having the above structure, one end of the idle adjusting valve control device is in contact with the second member in the throttle valve closing direction, and the other member is provided between the second member and the third member. A fourth member that abuts in the throttle valve closing direction, and a fourth spring that elastically connects the second member to the fourth member and causes the second member to follow the operation of the fourth member in the throttle valve opening direction. By providing the electric throttle, it is possible to provide the electric throttle with a reliable fail-safe function.

In the above structure, the idle adjusting valve drive mechanism includes a fifth member that abuts the third member in the throttle valve opening direction and a fifth spring that biases the fifth member in the throttle valve opening direction. A bypass valve is installed in the idle adjusting valve drive mechanism so that the bypass passage is fully opened at a throttle valve minimum opening or more, so that the bypass valve is fully opened and the bypass valve is fixed in an operating region other than the idle time. In addition, the stroke of the bypass valve can be shortened to simplify the mechanism.

[0008]

The first member is biased by the first spring in the accelerator return direction, that is, the throttle valve closing direction, and works in conjunction with the accelerator to define the throttle valve maximum opening position (first restricting position) according to the accelerator opening. . Then, when the third member is driven by the motor in the opening direction of the throttle valve, the third member
The second member operates in the throttle opening direction by the action of the member, and the throttle valve interlocked with the second member opens. At this time, the maximum opening of the throttle valve is regulated to the position where the second lever contacts the regulating portion of the first member. When the third member is driven in the throttle valve closing direction, the action of the second spring causes the second member to follow the third member, and the throttle valve closes in conjunction with it. At this time, the minimum opening of the throttle valve is regulated by the second member coming into contact with the limiter. Further, when the third member is further driven in the throttle valve closing direction by the motor in the state where the second member is in contact with the limiter and the throttle valve opening is at the minimum opening, the idle member operates in conjunction with the third member. The adjustment valve drive mechanism operates, the bypass valve is opened and closed, and the bypass air is adjusted.

The fourth member operates in the throttle valve opening direction in conjunction with the operation of the third member in the throttle valve opening direction. At this time, the second member follows the fourth member by the action of the fourth spring and operates in the throttle valve opening direction. And
When the motor or the like runs out of control, the accelerator is returned, so that the restricting portion of the first member pushes back the second member in the throttle closing direction by the spring force of the accelerator return spring, and the fourth spring extends and only the fourth member moves to the third position. By following the member, the fail-safe function works.

The fifth member operates in the throttle valve closing direction in conjunction with the operation of the third member in the throttle valve closing direction, and the throttle is set to fully open the bypass passage when the throttle valve has a minimum opening or more. Drive the valve in the closing direction.
The fifth spring biases the fifth member in the throttle valve opening direction and causes the fifth member to follow the third member when the third member operates in the throttle valve opening direction. The throttle valve is driven in the opening direction by the action of the fifth spring, and returns to the fully opened state when the throttle valve has a minimum opening or more.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a model diagram showing a control system of an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a concrete structure thereof. 1 and 2, corresponding parts are designated by the same reference numerals.

The engine idle control valve control system according to this embodiment is provided with a throttle valve 2 provided in an intake passage 1.
And a bypass valve 4 provided in a bypass passage 3 bypassing the throttle valve 2 is driven by a common drive source, and an accelerator 5 is provided with an accelerator pulley (first member) 6 via an accelerator link mechanism. They are linked together. An accelerator return spring (first spring) having one end fixed to the vehicle body is attached to the accelerator pulley 6.
A biasing force is applied in the accelerator return direction by 7. Further, a throttle rod (second member) 8 (8A, 8B) is connected to the throttle valve 2 via a throttle link mechanism.
Are linked together. The throttle rod 8 comes into contact with the regulating portion 6a of the accelerator pulley 6 on the accelerator depression side to regulate the maximum opening of the throttle valve, and a limiter 9 provided on the opposite side of the regulating portion 6a. It is movable to and from a second regulation position that regulates the minimum opening of the throttle valve by abutting against the. A motor rod (third member) 11 (11A, 11B) is drivingly connected to the motor 10 that is a drive source,
Further, a relay rod (fourth member) 12 is provided so that one end contacts the throttle rod 8 in the throttle valve closing direction and the other end contacts the motor rod 11 in the throttle opening direction.

Between the motor rod 11 and the relay rod 12, a drive-side rod spring (second spring) 13 that causes the throttle rod 8 to follow the relay rod 12 when the motor rod 11 operates in the throttle valve closing direction.
Is stretched. The motor rod 11 is urged in the throttle valve opening direction by a motor spring (third spring) 14 whose one end is fixed to the vehicle body side. A driven rod spring (fourth spring) 15 is stretched between the throttle rod 8 and the relay rod 12 so that the throttle rod 8 follows the operation of the relay rod 12 in the throttle valve opening direction.

The bypass valve 4 is connected to a valve rod (fifth member) 16 that contacts the motor rod 11 in the throttle valve opening direction. And the valve rod 16
Is a valve spring with one end fixed to the vehicle body (5th
The throttle valve 8 is biased by the spring 17 in the throttle valve opening direction and holds the bypass valve 4 at a constant position where the bypass passage 3 is fully opened when the throttle valve is at the minimum opening or more. When the opening is reached, the motor rod 11 is further driven in the throttle valve closing direction to drive the bypass valve 4 in the closing direction.

Further, an accelerator idle switch 18 for detecting an accelerator return state is provided in the middle of the accelerator link mechanism connected to the accelerator 5. And
An accelerator sensor 19 is arranged on the vehicle body side so as to detect the accelerator opening depending on the operating position of the accelerator pulley 6.
A restriction unit switch 20 for detecting a condition in which the restriction unit 6a of the accelerator pulley 6 has reached the restriction position of the accelerator return state is arranged, and a throttle sensor 21 for detecting a throttle valve opening is arranged.

When the accelerator 5 is stepped on, the accelerator sensor 19 detects the accelerator opening. Then, the detection signal of the accelerator sensor 19 is input to a control unit (not shown), the throttle opening degree is set according to the accelerator opening degree and the engine operating state, and the drive current according to the set opening degree is set to the motor. 10 is applied. When the motor 10 rotates in the throttle valve opening direction, the relay rod 12 interlocks with the motor rod 11 to move (specifically, rotate) in the throttle valve opening direction, and the throttle rod 8 acts by the rod spring 15 on the driven side. Moves in the throttle valve opening direction by following the relay rod 12 (specifically, rotation)
Then, in conjunction with this, the throttle valve 2 moves in the opening direction. Then, the throttle sensor 21 detects the throttle valve opening from the moving position (specifically, the rotational position) of the throttle rod 8, and the detection signal is input to the control unit, and the detection signal is input according to the deviation between the set opening and the actual opening. Feedback correction is performed. When the motor 10 runs out of control,
When the accelerator 5 is returned, the restricting portion 6a of the accelerator rod 6 pushes the throttle rod 8 back toward the throttle valve closing direction by the spring force of the accelerator return spring 7, and the driven rod spring 15 extends and only the relay rod 12 has the motor rod 11. To follow. When the motor 10 further rotates in the throttle valve closing direction from the throttle valve minimum opening position, the bypass valve 4 is driven from the fully opened state to the closed side. When the motor 10 rotates in the throttle valve opening direction while the bypass valve 4 is driven to the closing side, the action of the valve spring 17 causes the motor rod 1 to move.
The valve rod 16 follows the movement of the throttle valve 1 in the opening direction of the throttle valve 1, and when the motor rod 11 reaches the throttle valve minimum opening position, the bypass valve 4 is fully opened. It comes into contact with the side and is held in a fixed position in the fully opened state.

As shown in the front view and the sectional view of FIGS. 3A and 3B, the bypass valve 4 is provided with an opening 4a on the side wall of a cylindrical valve body, and the opening 4a and the outer wall. The air passage hole 22 on the side is configured to adjust the amount of bypass air by overlapping depending on the rotation angle of the valve body. The rotation angle of the bypass valve 4 is feedback-controlled by the control unit based on the deviation between the set idle rotation speed and the actual rotation speed.

FIG. 4 shows another embodiment of the present invention, which is a bypass valve 4'in which an ISC bypass valve and an AMI (air mix change) bypass valve are integrated.
Is shown. This bypass valve 4'is IS on the side wall of the valve body.
Outlet opening 4'b for C and outlet opening 4'c for AMI
And air passage holes 23, 24 are provided on the outer wall side corresponding to the openings 4'b, 4'c, respectively. Also,
On the side wall of the valve body, two inlet openings 4'a for introducing bypass air are provided at opposite positions, and on the outer wall side, an annular air chamber 25 surrounding the inlet opening 4'a and the air chamber 25.
Is provided with an air passage hole 22. This bypass valve 4'is connected to the valve rod 16 of the mechanism of the previous embodiment. Due to the rotation of the valve element, the openings 4′b and 4′c for ISC and AMI overlap with the air passage holes 23 and 24 in their respective phases.

Although the rotary bypass valve is used in the above embodiment, the bypass valve may be configured to convert the rotational movement of the valve rod into the reciprocating movement of the needle-shaped valve body by the screw mechanism. it can.

[0021]

Since the present invention is configured as described above, the throttle valve and the bypass valve can be controlled with high precision by one motor, and the idle control system can be simplified, downsized, and at low cost. Can be realized. In addition, it is easy to give the electric throttle a reliable fail-safe function while using a common motor, and prevent the sticking of the bypass valve by fully opening the bypass valve in areas other than during idle, and shortening the stroke of the bypass valve. It becomes easy to simplify the mechanism.

[Brief description of drawings]

FIG. 1 is a model diagram showing a control system according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a specific structure of an embodiment of the present invention.

FIG. 3 is a front view (a) and a sectional view (b) of a bypass valve according to an embodiment of the present invention.

FIG. 4 is a front view (a) and a sectional view (b) of a bypass valve according to another embodiment of the present invention.

[Explanation of symbols]

 1 Intake Passage 2 Throttle Valve 3 Bypass Passage 4 Bypass Valve 5 Accelerator 6 Accelerator Pulley (First Member) 6a Regulator 7 Accelerator Return Spring (First Spring) 8 Throttle Rod (Second Member) 9 Limiter 10 Motor 11 Motor Rod ( Third member) 12 Relay rod (fourth member) 13 Drive side rod spring (third spring) 14 Motor spring (fourth spring) 15 Driven side rod spring (fourth spring) 16 Valve rod (fifth member) 17 Valve Spring (5th spring)

Claims (3)

[Claims] 1. An idle adjustment valve control device for controlling an idle adjustment valve including a bypass valve provided in a bypass passage for bypassing a throttle valve provided in an intake passage,
A first member that interlocks with the accelerator, a first spring that urges the first member in the accelerator return direction, and a throttle valve that are interlockingly connected and contact the regulating portion of the first member to regulate the maximum opening of the throttle valve. A second member movable between a first restricting position that contacts the limiter and a second restricting position that contacts the limiter to restrict the throttle valve minimum opening degree, and a third member that acts on the second member in the throttle valve opening direction. A member, a second spring that elastically acts on the third member with respect to the third member to cause the second member to follow the operation of the third member in the throttle valve closing direction, and the third member. A motor for driving, a third spring for urging the third member in the throttle valve opening direction, and a direction in which the second member is in contact with the limiter for closing the throttle valve of the third member by the motor. Linked to the operation of Idle control valve control device for an engine characterized by comprising an idle adjusting valve driving mechanism for opening and closing the serial bypass valve. 2. A first member between the second member and the third member, one end of which abuts on the second member in the throttle valve closing direction and the other end of which abuts on the third member in the throttle valve opening direction. 4. A fourth member, and a fourth spring which elastically connects the second member to the fourth member and causes the second member to follow the operation of the fourth member in the throttle valve opening direction. 1. The engine idle control valve control device according to 1. 3. The idle adjustment valve drive mechanism includes a fifth member that abuts against the third member in the throttle valve opening direction, and the fifth member.
3. A fifth spring for urging a member in the throttle valve opening direction, and a bypass valve is attached to the idle adjusting valve drive mechanism so as to fully open the bypass passage at a throttle valve minimum opening or more. An idle control valve control device for the engine described.