JPH0734182Y2 - Throttle valve control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a throttle valve control device for an internal combustion engine, and more particularly, to a throttle valve inoperability caused by a deposit adhering to the inner wall of an intake passage in which the throttle valve is provided. TECHNICAL FIELD The present invention relates to a throttle valve control device for preventing.

[Conventional technology]

Generally, in an internal combustion engine, in order to prevent the throttle valve from sticking to the deposit accumulated in the intake passage, the throttle opener opens the throttle valve several times in the opening direction from the fully closed state of the intake passage when the engine is stopped. ing.

[Problems to be solved by the device]

In the sticking prevention technique described above, since the deposit is deposited and accumulated on the inner wall of the intake passage, the flow rate of the intake air flowing between the throttle valve and the intake passage also fluctuates according to the deposit attachment degree, and when the engine is stopped. Depending on the throttle valve opening setting and the accumulated deposit amount, the throttle valve may eventually become stuck and become inoperable. In view of such a problem, the present invention provides a throttle valve control device that smoothes the operation of the throttle valve.

[Means for Solving the Problems]

According to the present invention to solve the above problems, a throttle valve provided in an intake passage of an engine for controlling an intake flow rate of the engine in conjunction with an accelerator pedal, and a throttle valve provided at an outer edge of a valve body of the throttle valve are provided. When the intake passage is fully closed, the elastic member that elastically contacts the inner wall of the intake pipe, when the engine ignition switch is turned on, the throttle valve is operated to the intake passage fully closed position, and the ignition switch is turned off.
There is provided a throttle valve control device including: a stopper device that operates the throttle valve from the fully closed position to a predetermined position in a direction opposite to the throttle valve opening direction during engine operation.

[Action]

The stopper device changes the position of the throttle valve in response to the ignition switch being turned on and off. That is, when the engine is stopped and then started, the throttle valve is rotated from the predetermined position to the fully closed position, and when the engine is stopped, the throttle valve is rotated from the fully closed position to the predetermined position. By repeating this rotation, the elastic member scrapes off the deposit adhering to the inner wall of the intake passage.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a throttle valve control device according to the present invention, showing an intake passage portion in which a throttle valve is installed. In the figure, 1 is an intake pipe that defines an intake passage 2 inside, 3 is a throttle valve that rotates in the intake pipe 1 and controls intake flow, and 4 is a valve shaft of the throttle valve 3.
A throttle link 5 connected to 3a and located outside the intake pipe 1 and interlocking with each other, 5 is an accelerator pedal, and 6 is an accelerator wire connecting the accelerator pedal and the throttle link 4.

The throttle valve 3 is provided with an elastic member (for example, rubber or the like) 7 that contacts the inner wall 1a of the intake pipe 1 at the outer edge of the valve body 3b when the intake passage is fully closed, as shown by the dotted line in the figure. For example, the engine is in an idle state. The elastic member 7 contacts the inner wall 1a when the accelerator pedal 5 is not depressed, such as when the vehicle is decelerating or when decelerating, and the intake valve upstream side (upper side in the figure) and downstream side (lower side in the figure) of the throttle valve 3 are connected. It is designed to shut off.
In this case, intake air is supplied to the engine via a bypass passage (not shown).

Further, the throttle valve 3 is locked in the valve body 3a and is rotated in a direction (clockwise direction) opposite to the direction (counterclockwise direction in FIG. 1) in which the throttle valve 3 rotates during engine operation. A return spring (tensile spring) 8 that biases the rotation is provided. Therefore, the state of the throttle valve 3 shown by the alternate long and short dash line in the figure shows that the engine is in the full throttle state, and the throttle valve 3 is rotated by the accelerator wire 6 against the reverse biasing force of the return spring 8. When the engine is operating, it is configured to rotate between a fully closed position a shown by a dotted line and a fully opened position c shown by a chain line.

In the throttle valve control device configured as described above, according to the present embodiment, the stopper device 9 for restricting the position of the throttle valve 3 via the throttle link 4 is provided.

This stopper device 9 has a solenoid 11 which is provided outside the intake pipe 1 and which is energized or deenergized by turning on / off an ignition switch 10. The solenoid 11 is actuated by an electromagnetic force when the solenoid is energized. Of the throttle link 4 corresponding to the fully closed position a of the throttle valve 3 is operated so as to protrude from the casing 11a of
The rod 12 that comes into contact with is attached (see the dotted line position in the figure). Therefore, when the solenoid 12 is not energized, the rod 12 assumes the position shown by the solid line in the figure, and the position of the throttle valve 3 corresponding to the throttle link 4 that abuts at this position is shown by the dotted line in the figure. It occupies a solid line position b in the drawing, which is rotated further in the biasing direction of the return spring 8 than the closed position a. Reference numeral 13 is a battery that supplies electric power for driving the stopper device.

The operation of the above-described throttle valve control device will be described below.

In the throttle valve control system shown in FIG. 1, when the engine is stopped, the ignition switch 10 is in the OFF state as shown in the figure, so that the solenoid 11 is not energized, so that the rod 12 of the solenoid 11 contacts the bottom of the casing 11a. The solid line position b in the figure is taken. Therefore, when the ignition switch 10 is changed from the ON state to the OFF state, the throttle valve 3 is rotated clockwise by the pulling of the return spring 8 until the throttle link 4 comes into contact with the tip of the rod 12, as shown by the solid line in the figure. However, it is stopped at a predetermined position b in a direction opposite to the throttle valve opening direction during engine operation, rather than the fully closed position a.

Next, when the engine starts to operate, the ignition switch 10 changes from the OFF state to the ON state. As a result, the solenoid 11 is energized and the rod 12 opposes the pulling force of the return spring 8 to rotate the throttle link 4 to the throttle valve fully closed position a as shown by the dotted line in the figure.
When the engine is operating, the ignition switch 10
Is maintained in the ON state, the throttle valve 3 is in the fully closed position a.
The rod 12 regulates the opening degree of the throttle valve 3 to the fully closed position a during idling or deceleration when the accelerator pedal 5 is not depressed but the accelerator pedal 5 is depressed.

That is, according to this embodiment, the throttle valve 3 reciprocates between the position a and the position b in the figure in synchronization with ON / OFF of the ignition switch 10, and when fully closed, the inner wall 1a of the intake pipe 1 is closed.
The deposit adhered to the inner wall 1a can be scraped off by the elastic member 7 in contact with.

FIG. 2 shows a second embodiment of the present invention. In the previous embodiment, the throttle valve was rotated by the solenoid and the accelerator pedal, while in this embodiment it is rotated by the valve actuator that also has the function of the stopper device. In FIG. 2, the same components as those in FIG. 1 are designated by the same reference numerals.

According to this embodiment, the throttle valve 3 is the throttle link.
It is connected to the valve actuator 16 via the rod 14 and the rod 15, and rotates within a range from the position b shown by the solid line to the position a (fully closed position) shown by the dotted line to the position c (fully opened position) shown by the alternate long and short dash line. It is possible. Valve actuator
The operation of the control circuit 16 is controlled by an output signal from a control circuit (ECU) 17, a battery 13 is connected to the control circuit 17 via an ignition switch 10, and the depression amount of the accelerator pedal 5 is detected. The output signal A from the accelerator opening sensor 18 and the NE signal from the engine speed sensor provided in the distributor 19 are input. The operation of the throttle valve control apparatus according to the present embodiment, however, is such that when the ignition switch is OFF, the actuator 16 that does not input a signal from the ECU 17 is initialized so that the throttle valve 3 is in the b position, and engine start is started. When the ignition switch 10 is turned on with the
The actuator 16 operates the rod 15 by the signal from 7, and the throttle valve 13 is set to the position a so as to block the intake passage 2. When the engine is operating, the throttle valve 3 is the NE from the distributor 19.
Based on the signal and the A signal from the accelerator opening sensor 18, the actuator is rotationally controlled to have a throttle valve opening determined by a map preset in the ECU 17 as shown in FIG. 3, for example. It Regarding this map, for example, the rate of change in load with respect to changes in the accelerator opening in the low engine speed range is larger than that in the high engine speed range, so in the low engine speed range the throttle valve opening changes slightly for the same displacement of the accelerator pedal. Is set as
Map interpolation is performed in the rotation range during this period. The operation of the elastic member 7 provided on the outer edge of the valve body 3b of the throttle valve 3 is the same as that of the first embodiment, and the throttle valve 3 is moved to the second position as the ignition switch 10 is turned on and off.
When reaching the position b from the position a in the figure, the deposit adhering to the inner wall 1a of the intake pipe is scraped off.

[Effect of device]

As described above, according to the present invention, when the ignition switch is turned from the ON state to the OFF state, the elastic member moves from the elastic contact with the inner wall of the intake passage to the predetermined position, so that the deposit adhered to the inner wall is scratched. This operation can also prevent the accumulation of deposits which is repeated every time the engine is shut down. As a result, it is possible to avoid fluctuations in the intake air flow rate due to inoperative throttle valves and deposits.

[Brief description of drawings]

1 is a schematic configuration diagram showing a first embodiment of a throttle valve control device according to the present invention; FIG. 2 is a schematic configuration diagram showing a second embodiment of the throttle valve control device; FIG. 3 is a view of the second embodiment. The map figure which determines a throttle valve opening. 1 ... intake pipe, 2 ... intake passage, 3 ... throttle valve,
7 ... Elastic member, 9 ... Stopper device, 10 ... Ignition switch, 16 ... Valve actuator (stopper device).

Claims (1)

[Scope of utility model registration request] 1. A throttle valve provided in an intake passage of an engine for controlling an intake flow rate of the engine in conjunction with an accelerator pedal, and an intake passage provided at an outer edge of a valve body of the throttle valve when the intake passage of the throttle valve is fully closed. An elastic member that makes elastic contact with the inner wall of the pipe, and when the engine ignition switch is turned on, the throttle valve is operated to the fully closed position of the intake passage, and when the ignition switch is turned off, the throttle valve from the fully closed position when the engine is operating A throttle valve control device comprising: a stopper device that is operated at a predetermined position in a direction opposite to the valve opening direction.