JPS5827835A - Actuator for engine with supercharger - Google Patents

Abstract

PURPOSE:To impart an actuator with sufficient working force by a method wherein the inside of the actuator is divided into a positive pressure chamber and a negative pressure chamber and a first and a second valve is provided for communication controlling respectively between the positive pressure chamber and the upstream of a throttle valve and between the negative pressure chamber and the downstream of the throttle valve. CONSTITUTION:The inside of an actuator 20 is divided by a diaphragm 25 into a positive pressure chamber 21 in which a wire 32 fastened to a throttle valve 5 is arranged fixedly and a negative pressure chamber 22 in which a spring is arranged stretchedly. These chambers are provided with a first and a second port 23, 24 respectively, and a takeout port 11, 12 is mounted on the upstream side and downstream side respectively. Further, valve housings 18, 19 are communicated with the port 23, 24 through pipe passages 13, 14 respectively. The chambers 21 and 22 are communicated with the upstream and downstream of the throttle valve 5 respectively through first and second valves 16 and 17 housed in valve housings 18 and 19 respectively. The valves 16 and 17 are driven by a linear motor 15 simultaneously. With this construction, when an automobile runs at a speed slower than a preset value, the motor 15 operates to open the valves 16 and 17, so that the pressure on both sides of the throttle valve 5 actuates on the both sides of the diaphragm 25 to move the wire 23 in the valve 5 opening direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator for a supercharged engine that can be applied to a constant speed traveling device, a brake booster, an EGR pulp, etc.

In conventionally proposed actuators for constant speed traveling devices (for example, Japanese Utility Model Publication No. 15886/1986), the servo motor of the actuator is operated by negative pressure in the intake pipe. In the case of a normal engine, the negative pressure in the intake pipe is large, so the actuator can be operated sufficiently, but in the case of a supercharged engine, the negative pressure is smaller or more positive than in the case of a normal engine. The actuator could not be operated sufficiently with this negative pressure.

The present invention was proposed in order to solve the above-mentioned conventional drawbacks, and by introducing positive pressure and negative pressure on the upstream and downstream sides of the throttle valve in the intake pipe of a supercharged engine to the actuator, the actuator An object of the present invention is to provide an actuator for a supercharged engine that can obtain sufficient operating force.

The present invention will be explained below with reference to the embodiments shown in the drawings. (11
The supercharger is composed of a turbine (2) and a compressor (3), and the air supplied from the turbine (2) is passed through an intake pipe (4) to a throttle valve (5), an air chamber (6), and an intake valve (7). ) to the engine having a piston (8). Further, the exhaust gas from the exhaust valve (9) of the engine is discharged from the exhaust pipe 00) via the compressor (3).

The intake pipe (4) upstream and downstream of the throttle valve (5)
) is equipped with a positive pressure outlet 0υ and a negative pressure FJ) outlet 0, and the first pulp 0e and It communicates with the second pulp 0η. The chamber a marked in which the first pulp aω was accommodated, and the chamber α marked in which the second pulp 07) was accommodated are the positive pressure chamber Cυ of the actuator (20) and the negative pressure chamber (the first boat e3 and the negative pressure chamber 221), respectively. It communicates with the second port 04).

The actuator (2υ) is separated by a diaphragm (29) into a positive pressure chamber (21) and a negative pressure chamber (221), and on the positive pressure chamber 01 side is a rod (2υ) fixed via a retainer (260). , a retainer (26 inside the negative pressure chamber (2a)
),! : A spring (c) is placed between the left end walls of the housing. In addition, the rod (28) extends outside the housing (c), and the rod (28) and the rod (28) extend outside the housing (c).
The outer periphery of the rod (5) is fixed to the other end of the rod (5) and covered by a boot Gυ whose expansion is limited by a ring (3), and a wire (5) connected to the throttle valve (5) is attached to the other end of the rod (5). Three are fixed: the throttle valve (
5), the opening degree is adjusted by an accelerator pedal (not shown), but after setting to constant speed running, the opening degree is adjusted according to the left and right movement of the rod (2j) via the wire.

Next, to explain the operation when the actuator (201) is used for constant speed driving, the vehicle speed is detected from a vehicle speed detector number (not shown).When this vehicle speed is smaller than the set vehicle speed, the signal is sent to a computer (not shown).Computer A signal to open the pulp is given to the beam near motor Q51, and the pulp 06) Q7) is opened. From the pulp aO, positive pressure from the outlet 0υ enters the main royal chamber (21) via the first boat (23), and at the same time, from the pulp 07), the positive pressure from the outlet 0υ
Negative pressure from the negative pressure chamber (24) flows through the second port (24).
221.

Therefore, the diaphragm moves to the left against the spring (2), and the throttle valve (5) opens via the rod (2) and the wire (3).The opening of the throttle valve (5) causes the vehicle to speed up. When the vehicle speed increases and reaches the set vehicle speed, this signal is input to the computer, which issues a command to the llinear motor (+51) to close the pulp. Therefore, the pulp (16) αη is closed, and the positive pressure chamber (21) and negative pressure chamber (21) are closed. The positive pressure and negative pressure in the pressure chambers (221) are maintained at the same level at the set vehicle speed because each of the chambers (20 (b)) is sealed, and the diaphragm Q51 is connected to the spring holder and the positive and negative pressures in each of the chambers. The throttle valve (5) remains at a position balanced with the negative pressure, and the throttle valve (5) maintains a constant opening state, allowing the vehicle to run at a constant speed.

Since the present invention is configured as explained in detail above,
Even if the negative pressure downstream of the throttle valve in a supercharged engine is unstable because it is small or close to positive pressure, it does not directly introduce the negative pressure like conventional actuators. The actuator is actuated by the pressure difference between the upstream and downstream sides of the throttle valve.
Factors such as the small negative pressure on the downstream side do not impede the operation of the actuator of the present invention at all.

In addition, since the present invention uses the pressure difference on both sides of the throttle valve, the engine pressure required to move the actuator is lower than in the past, which extracts negative pressure only from the downstream side of the throttle valve, which reduces engine horsepower savings. This can save energy.

[Brief explanation of the drawing]

The drawing is a system diagram of an actuator for a supercharged engine showing an embodiment of the present invention. Explanation of the main parts of the diagram ■...Supercharger 4...Intake pipe 5...Throttle valve 8...Piston 11...Upstream outlet 1
2...Downstream outlet 15...Linear motor 16
...1st C II/7" 17...2nd pulp 2
0... Actuator 21... Positive pressure chamber 22...
Negative pressure chamber 25...diaphragm 27...l
:l ツ)” 28...Housing 29.
...Spring 81...Boot 82...Wire

Claims (1)

[Claims] In an actuator for a supercharged engine, the actuator is separated into a sealed positive and negative royal chamber, and a diaphragm mettle valve is provided on the upstream and downstream sides of a diaphragm mettle valve, which is biased by a spring on the positive royal side. first and second outlets for controlling the positive pressure and negative pressure, and for controlling the upstream and downstream outlets to communicate with the positive pressure chamber and the negative pressure chamber, respectively;
An actuator for a supercharged engine characterized by being made of pulp.