JPS6176729A - Throttle valve control device of internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce fatigue in accelerator operation by weakening a return spring by connecting a drive unit to a throttle valve and by closing the throttle valve forcedly from the vicinity to full closing at the time of releasing of depressing of an accelerator pedal. CONSTITUTION:A follower cam 2 is connected to a rotary shaft 11 of a throttle valve 1 of intake passages 20A, 20B and a diaphragm device 4 of intake nega tive pressure is connected to the follower cam 2 via a lever 3. An accelerator pedal switch 10 is provided on a accelerator pedal 9 and when depressing of the accelerator pedal 9 is released, a solenoid valve 6 is electrified to close an atmospheric pressure introduction path 7, and intake negative pressure is introduced from a negative pressure introduction path 8 into a negative pressure chamber 18 and the diaphragm device 4 rotates the follower cam 2 to the count er clockwise direction via the lever 3 to close a throttle valve 1 forcedly. Then, energizing force of a return spring of the throttle valve 1 becomes unnecessary almost near the full closing position, and accelerator operating force can be reduced.

Description

[Detailed description of the invention] (Fields of use by writers in I) The present invention relates to an internal combustion throttle valve control device.

(Prior art) Generally speaking, an internal combustion throttle valve for an automobile is provided with a return spring that exerts an N force in the closing direction, and is driven to open and close by the accelerator pedal via a wire ('1.''r 574480!j' (see official bulletin).

The spring load of the return spring is set to be quite large in order to reliably close and drive the throttle valve against the 121 dynamic resistance of the wire and the friction of the Monben Kai 1 Warm Pongee.

(Problem 7r that the invention seeks to solve:, The valve sometimes did not close completely leaving a small gap.

Furthermore, if the return spring is strengthened to counteract this, there is a problem in that a large accelerator pedal depression force is required when the throttle valve is close to fully open (1 JrI).

The present invention aims to solve the above problem α.

(Means for Solving the Problem) The present invention connects a driven cam to the rotating shaft of a throttle valve, a lever that drives the driven cam toward the throttle valve closing side, and a drive device that connects this lever. A detection means for detecting the depression state of the accelerator pedal is provided, and a control means is provided for activating the drive 'j'c7f when the accelerator pedal is depressed, and is driven near the fully open position where frictional resistance is large)
The throttle valve is forcibly closed and driven by the second position.

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

, rotation +il+ 1 ] of the throttle valve 1 is urged in the closing direction by a return spring (not shown), and is connected to the accelerator pedal 9 via a wire 13.
By depressing the accelerator pedal 9 and rotating it around the bolt 14, the accelerator pedal 9 is rotationally driven in the opening direction.

+iir rotary spindle] 1. Connect the driven cam 2 to the nut 12.
Fixed via.

A lever 3 that engages the driven cam 2 only in the closing direction of the throttle valve 1 is rotatably connected to N+16.

A diaphragm device 4 serves as a rotational drive device for this lever 3.
The diaphragm 17 of the diaphragm device 4 projects a rod 18 and is connected to the middle of the lever 3, and a spring 19 that presses the diaphragm 17 urges the lever 3 away from the driven cam 2.

The negative pressure chamber 1r+ of the diaphragm device 4 is connected to a three-way valve/id valve 6 via a path 21, and is connected to an atmospheric pressure introduction passage 7 which communicates with an upstream intake passage 2OA of the throttle valve by this valve/id valve 6. It is selectively connected to the negative pressure introduction passage 7 communicating with the downstream side intake passage 20B of the valve 1.

A delay valve 5 is interposed in the middle of a passage 21 that communicates the negative pressure chamber 18 and the strain/id valve 6, and this delay valve 5 has an orifice 22 that gently guides negative pressure into the negative pressure chamber 18.
and a one-way valve 23 that smoothly guides atmospheric pressure into the negative pressure chamber 18.

Turns on when the accelerator is fully closed due to the movement of the accelerator pedal 9
An accelerator pedal switch 10 is provided, and energization of the slide/id valve 6 is controlled by a signal from the accelerator pedal switch 10.

The system is configured as described above, and its operation will be explained next.

2 in the figure. When the accelerator pedal 9 is depressed as shown by the alpha chain line, the accelerator pedal switch 11) is closed and the solenoid HALPRO is energized. As a result, the strain/id valve 6 closes the negative pressure introduction passage 8, and the negative pressure chamber 1εj
From the atmospheric pressure introduction passage 7 to the intake passage 2 upstream of the throttle valve 1
Atmospheric pressure of 0A is introduced. The diaphragm 17 separates the lever 3 from the driven cam 2 by the force of a single spring, and does not interfere with the opening/closing operation of the throttle valve 1 which is linked to the accelerator pedal. Therefore, normal accelerator operation allows F- to be performed comfortably.

On the other hand, when depressing the accelerator pedal 9 is released, such as during deceleration, the accelerator pedal switch 10 opens near the fully closed position of the accelerator pedal 9, as shown by the solid line in the figure, and the energization to the travel/idle valve 6 is stopped. . As a result, the strain/id valve 6 closes the atmospheric pressure introduction passage 7, and the Isoseki suction negative pressure generated in the intake passage 20B on the downstream side of the throttle valve 1 is introduced from the negative pressure introduction passage 8 into the negative pressure chamber 18. The diaphragm 17 rotates the lever 3 counterclockwise in the figure without compressing one spring due to this negative pressure, bringing the tip of the lever 3 into contact with the pawl 25 of the driven cam 2, and closing the throttle valve 1. Drive rotation in the direction.

In this way, when the accelerator pedal 3 is released, the throttle valve 1 is forcibly driven in the closing direction from the vicinity of the fully closed position by the strong Isoseki suction negative pressure generated in the lower part of the throttle valve 1, and the throttle valve 1 is forced to close completely. The throttle valve 1 is fully closed by overcoming the frictional resistance acting on the throttle valve 1 in the vicinity.

In addition, in this way, the biasing force of the return spring of the throttle valve 1 is almost the same near the fully open position, so the spring load can be set much smaller than in the past.
The driver's pressing force on the accelerator pedal 9 can be reduced.

In addition, when the throttle valve 1 is opened by depressing the accelerator pedal 9 from the full 1゛I] position of the throttle valve 1, the accelerator pedal switch 10 is closed at the idle position where the throttle valve 1 is not interlocked with the accelerator pedal 9. By setting the lever 3 to
is separated from the driven cam 2, so that no heavy pressing force remains on the accelerator pedal 9.

In the above embodiment, a diaphragm device is used as the drive device, but a solenoid actuator or the like may also be used.

(Effects of the Invention) As described above, the present invention forcibly closes the throttle valve from near the fully closed position using the drive device, which not only ensures reliable operation of the throttle valve but also weakens the return spring. This reduces the fatigue of the driver during normal accelerator operation and improves drivability.

[Brief explanation of drawings]

The drawing is a side view showing an embodiment of the invention.

Claims (1)

[Claims] A lever that connects a driven cam to the rotating shaft of the throttle valve and drives the driven cam toward the valve closing side, and a drive device that connects to this lever are provided, and a detection means that detects the depression state of the accelerator pedal, and 1. A throttle valve control device for an internal combustion engine, comprising a control means for operating a drive device when the pedal is released.