Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1993-08-25
1995-06-13
Kamen, Noah P.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
123400, 123403, F02D 900
Patent
active
054232996
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a control valve control apparatus for controlling a flow rate control valve such as a throttle valve and the like used in an automotive engine fuel supply system, when the valve is also driven by a device such as a step motor.
BACKGROUND ART
Control apparatus for preventing slip of a vehicle on ice bound or snow covered roads incorporate a traction controller to control the closing of a second throttle valve which is not linked to the accelerator pedal, thereby controlling the fuel flow rate to reduce engine torque and drive force.
Preferably, the traction controller should be small and light weight, however, with the above apparatus wherein the traction controller is arranged separate from and connected in series with the throttle valve, the size is increased.
There is a throttle valve control apparatus which utilizes a single control valve with the opening determined by operation of the accelerator pedal under normal conditions, and automatically controlled irrespective of accelerator pedal operation, under traction control conditions. (For example refer to Unexamined Japanese Patent Publication No. 3-61654).
With this type of apparatus, the throttle shaft incorporating a butterfly type throttle valve is turned either by the operation of the accelerator pedal through a lost motion mechanism, or by a linkage to an actuator drive system.
This construction for the control valve control apparatus for controlling a control valve such as a throttle valve, however, results in an increase in cost due to the increased number of components and increased complexity of the mechanism. Moreover, the large number of components makes intercomponent adjustment during assembly difficult, so that apparatus reliability is compromised.
It is, therefore, an object of the present invention to provide a control valve control apparatus which addresses the above situation by having fewer components, thereby reducing cost and improving reliability.
DISCLOSURE OF THE INVENTION
In view of the above, the control valve control apparatus according to the present invention comprises; a pivotally mounted accelerator lever linked to an accelerator operation and having a first engagement member disposed thereon at a distance from a pivotal axis of its pivotal mount, a drive lever linked to an actuator and having a second engagement member, a pivotally mounted control valve shaft lever formed integral with a control valve and having a third engagement member disposed thereon at a distance from a pivotal axis of its pivotal mount, and a link lever having engagement portions for engagement with said first, second and third engagement members such that at least two of said engagement members allow relative movement, for linking together said accelerator lever, drive lever and control valve shaft lever.
With such an arrangement for the present invention, operation of the accelerator pedal turns the accelerator lever accordingly, while operation of the actuator moves the drive lever linked thereto. Here, the accelerator lever, drive lever and control valve shaft lever are linked together by engagement of the engagement portions of the link lever with the first, second and third engagement members provided respectively on the accelerator lever, drive lever and control valve shaft lever, with at least two engagement members allowing relative movement.
Moreover, with the present invention, the construction is such that when the actuator is stationary, the link lever is pivoted about the second engagement member by the first engagement member, which is pivoted together with the accelerator lever by the accelerator operation, thereby turning the control valve by way of the third engagement member. Hence, when the actuator is stationary, the link lever pivots about the second engagement member to turn the control valve in accordance with the operation of the accelerator.
Furthermore, with the present invention, when the actuator is operated with the accelerator operation fixed, the link lever is pivoted
Kamen Noah P.
Unisia Jecs Corporation
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