JPS5879635A - Dashpot device of engine for vehicle - Google Patents

Abstract

PURPOSE:To effectively actuate a dashpot device only when a brake is not applied, in the dashpot device in which moving speed of a throttle valve to its full closing positon is liminted, by decreasing a degree of throttling if application of the brake is sensed. CONSTITUTION:Depression of an accelerator pedal is released, when a brake is not applied, a brake switch 20 is opened to deexcite a solenoid coil 18, and a valve element 16 closes an atmospheric port 17, then air in a diaphragm chamber 6 is discharged via a throttle passage 14 in a negative pressure delay valve 13, thus rapid movement of a throttle valve to its full closing position is avoided, in consequence, a deceleration shock can be prevented. On the contrary, if a brake pedal is depressed, the switch 20 is closed to excite the solenoid coil 18 and open the atmospheric port 17, then the throttle valve 2 is returned to its full closing position substantially without application of dashpot action. In this way, deterioration of fuel consumption and/or deceleration performance can be avoided.

Description

[Detailed description of the invention] The present invention relates to a dashpot device for a vehicle engine.

To control the speed at which a throttle valve installed in the air system of a vehicle engine moves from a valve-open position close to the full-open position to the full-open position, and to quickly return the throttle valve to the full-open position. Vehicle engine dashpot devices that prevent engine damage are well known.

Dashpot devices have the effect of avoiding deceleration shock and hiccups that occur when the accelerator pedal is released, but on the other hand, they delay the closing of the throttle valve, which worsens fuel efficiency. . When driving without applying the vehicle's brakes, just by releasing the accelerator pedal, such as when transitioning to inertia driving or when changing gears, the system prevents the occupants from feeling uncomfortable due to the deceleration shock phenomenon. In order to avoid these occurrences, it is important to delay the closing of the throttle valve using the dashpot value, but this is not the case during deceleration driving where the vehicle's brakes are activated at the same time as the accelerator pedal is released. Even without the dashpot effect, a deceleration shock that causes discomfort to the occupants does not occur, and the dashpot effect of the Dashpot@1 only improves fuel efficiency and improves the engine's deceleration response. This will cause clouding.

The present invention provides an improved vehicle in which the dashpot action is performed only when the dashpot action is effective, that is, when the accelerator pedal is released without applying the brake and the throttle valve returns to the full position. The purpose is to provide a dashpot @ awakening for the engine.

According to the present invention, the throttle valve provided in the intake system of a vehicle engine is close to the fully closed position. In an engine dashpot device, the aperture ring included in the dashpot device can be switched between two stages by a device that detects the operation of the vehicle's brakes, and when the brakes are activated, the throttle ring of the throttle included in the dashpot device is switched to two stages. This is achieved by a dashpot device characterized in that the degree of restriction is reduced compared to when it is inactive.

According to this, when the brake is applied, the amount of squeeze of the throttle of the dashpot is reduced compared to when the brake is not applied, so that the dashpot device does not perform unnecessary dashpot action when the brake is applied, and the brake is not activated. meaningful dashpot action occurs only when no activation occurs.

The invention will now be explained in detail with reference to exemplary embodiments 1-w4 with reference to the attached figures.

The attached FIG. 1 is a schematic configuration diagram showing one embodiment of a dashpot @1 for a vehicle engine according to the present invention. In the figure, 1 indicates the intake passage of a vehicle engine.
A throttle valve 2 is provided in the middle of the cough intake passage. The throttle valve 2 is configured as a butterfly valve supported by a valve shaft 3, and is configured to carbonize when the valve shaft 3 is opened as the valve shaft 3 rotates. The valve shaft 3 is drivingly connected to an accelerator pedal by an accelerator system (not shown),
In response to depression of the accelerator pedal, the throttle valve 2 is opened in the clockwise direction as shown in the figure, and a return spring (not shown) applies a spring force in the counterclockwise direction as shown in the figure. Always move throttle valve 2 to the fully closed position.
It is energized by

4 shows the diaphragm eccentricity for dashpot wheel loading. The diaphragm [1114] includes a diaphragm 5 and defines a diaphragm chamber 6 on one side of the diaphragm 5. The diaphragm 5 carries a rod 7, which extends to the side opposite to the diaphragm chamber, and at its tip, the throttle valve 2 is moved from the open position close to the fully closed position. When it moves to the valve open position, it comes into contact with a lever 8 attached to the valve shaft 3. Further, the diaphragm 5 is biased by the compression coil spring 9 in the left direction in the figure, that is, in the direction in which the rod 7 comes into contact with the lever 8. The diaphragm chamber 6 has a conduit 10 and an atmosphere-release valve 11.
, the conduit 12 and the negative pressure delay valve 13 are released to the atmosphere. The negative pressure delay valve 13 has a passage 14 and a check valve 15 in parallel with each other, and the check valve 15 is designed to only allow air to flow toward the diaphragm chamber 6.

The atmospheric fog axillary valve 11 has an atmospheric port 17 that is selectively opened and closed by a valve 111i16. The valve 111A16 is driven by the electromagnetic coil 18, and opens the atmospheric port 17 when the electromagnetic coil 18 is energized, and closes the atmospheric port 17 when the electromagnetic coil 18 is not energized. It has become.

The electromagnetic coil 18&: is configured to be selectively supplied with current from a battery voltage 1119 by a brake switch 2011. The brake switch 2o senses the operation of the vehicle's brakes, and, for example, turns on when the brake pedal is depressed even slightly to activate the brakes.

When the accelerator pedal is released and the throttle valve 2 moves toward the fully closed position, the throttle valve 2
When the valve closes to the ■valve position, which is close to the fully open position, lever 8
comes into contact with the tip of the rod 7, and is further closed by the force of a return spring (not shown), thereby driving the rod 7 in the negative direction, and the diaphragm 5 is moved by the compression coil spring 9.
It moves to the right in the figure against the action of , and as a result, the air in the diaphragm chamber 6 is discharged to the outside of the diaphragm chamber. At this time, the brake pedal was not depressed,
When the brake is not applied, the brake switch 20 is open and the electromagnetic coil 18 is
The valve is not energized! l116 closes the atmospheric port 17. Therefore, in this poem, the air discharged from the diaphragm chamber 6 is passed through the passage 14 of the negative pressure delay valve 13.
This exhaust airflow is then exhausted to the atmosphere only through a throttling action (by which the closing speed of the throttle valve 2 is reduced to -S, thereby preventing the throttle valve 2 from accidentally returning to the fully open position. Occurrence of deceleration shock and hiccup phenomenon is repeated.

On the other hand, when the brake pedal is depressed and the brake is applied when the throttle valve 2 is closed as described above, the brake switch 20 is closed, the electromagnetic coil 18 is energized, and the atmospheric port 17 is closed. be opened. Therefore, at this time, the air discharged from the diaphragm chamber 6 is mainly discharged into the atmosphere from the atmospheric port 17, and since the flow of the discharged air is not substantially throttled, the throttle valve 2 receives a substantial dashpot effect. You will be able to return to the full position without turning. In this way, during deceleration when the brakes are activated, the dashpot action is not performed and the throttle valve 2 returns to the fully open position, thereby preventing deterioration of fuel efficiency at this time, and also reducing deterioration of deceleration performance due to the dashpot action. avoided.

Furthermore, when the throttle valve 2 returns to the fully open position and opens again, the diaphragm 5 compresses the spring 9.
The spring force causes the check valve 15 to move toward the left in the figure, causing the air to enter the diaphragm chamber 6 without being subjected to any substantial throttling action, and the diaphragm device 4
quickly returns to its initial state.

FIG. 2 shows another embodiment of the dashbot skeleton 1 according to the present invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. In such embodiments, the brake switch 20
In parallel with this, a vehicle speed switch 21 is provided. This vehicle speed switch 21 is designed to close only when the vehicle is close to or below a predetermined value, in other words, when the vehicle is substantially stopped. In this embodiment, even in the so-called racing event in which the throttle valve 2 is closed when the vehicle is stopped and then opened, the electromagnetic valve 18 is energized, the atmospheric port 17 is opened, and the dash is opened. The pot device no longer performs an unnecessary dashpot action, further improving fuel efficiency.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited to these embodiments, and various embodiments are possible within the scope of the present invention. will be clear to those skilled in the art.

[Brief explanation of drawings]

11I and 2 are 1*approximately Il1 diagrams each showing an embodiment of a dashpot device for a vehicle engine according to the present invention. 1... Intake passage, 2... Throttle valve, 3...
- Valve stem, 4... diaphragm device, 5... diaphragm. 6...Diaphragm chamber, 7...0tsudo, 8...lever. 9... Compression coil spring, 10... Conduit, 11...
Atmospheric release valve, 12... conduit, 13... negative pressure delay valve,
14... Comparison passage, 15... Check valve, 16... Valve element, 17...
... Atmospheric port, 18... Electromagnetic coil, 19... Battery electromagnetic, 20... Brake switch, 21...
Vehicle speed switch patent holder: Toyota Jidoken Industries Co., Ltd.
Attorney Patent Attorney Akashi A
m10-

Claims (1)

[Claims] In the Dashbot' device of a vehicle engine, the throttle valve installed in the sacrificial air system of the vehicle engine is moved from the open position close to the full-throttle pupil to the full-throttle position. The degree of aperture of the aperture included in the dashpot AM is switched in two stages by a device that detects the operation of the brake of the vehicle, and when the brake is applied, the degree of aperture is changed to two levels when the brake is applied, compared to when the chain brake is not activated. A dashpot device configured to reduce the degree of aperture.