JPS58106129A - Operation controller of waste gate valve - Google Patents

Abstract

PURPOSE:To control opening and closing of a waste gate valve, by opening and closing a leak control valve through a change of intake pressure in an intake passage. CONSTITUTION:Intake pressure increased in an intake passage 2 is guided to a sensing pressure chamber 17 through a sensing pressure passage 18, if pressure in the chamber 17 is below a preset value, a leak control valve 14 is opened to introduce atmospheric pressure into a working pressure chamber 11 via a leak passage 15 and working pressure passage 12, and a waste gate valve 8 is not operated. If the pressure in the chamber 17 is increased above the preset value, the valve 14 located in the front side of the chamber is closed to release a communicated condition to the atmosphere and generate a working condition in the passage 12. Pressure in the passage 2 is introduced into the chamber 11 through the passage 12 to open the valve 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wastegate pulp operation control device provided in a supercharger of an engine.

Conventionally, as a device of this type, a Tsuta engine is equipped with a supercharger consisting of a turbine in an exhaust passage and a proar in an intake passage, and a side passage is formed in the exhaust passage in parallel with the turbine, and a side passage is formed in the exhaust passage in parallel with the turbine. There is a type of wastegate that opens when the suction pressure exceeds a predetermined value. The pressure chamber is generally connected to the air intake i!1 [pathway] through a pressure passage, and when the pressure inside the pressure chamber exceeds a predetermined value, it is pushed by this and opens against a spring. - The control accuracy of the wastegate pulp operation control device is determined by the mutual accumulation of the volumetric efficiency of the turbine and proar, the mechanical precision of the wastegate pulp, etc. For example, the variation is relatively large, as shown by a in Figure S, and quality control of all parts is required.Furthermore, if we look at the operating characteristics of a conventional wastegate valve in Figure 5, the number of revolutions is , Even though the control boost pressure is 1 and has not reached the scheduled value O, the wastegate pulp rod moves by D, and the air gas bypasses the turbine from the side channel, so it is early XIJK.
This causes inconveniences such as the wastegate valve operating and the number of revolutions required to reach the specified supply pressure becoming ^^.

The object of the present invention is to obtain a device free from such inconveniences, and includes an engine equipped with a turbine having a displacement of %mM,
A feeder consisting of a blower in the intake passage is provided, and a narrow passage is formed in the exhaust passage in parallel with the skeleton turbine, and this is provided with a waste gate pulp that opens when the intake pressure in the raw intake passage is below a predetermined value. In the type, the working pressure guide on the back side of the wastegate pulp is connected to the working pressure passage communicating with the intake air: IIi sardine, and a leak control seal is installed that is normally open and communicates the inside of the amp with the atmosphere. A sensing pressure chamber on the back side of the control pulp is communicated with the skeleton intake passage through a sensing pressure passage, and when the pressure in the pressure chamber exceeds a predetermined value, the leak control valve is pushed and closed by this.

An example of the non-inventive implementation will be explained with reference to the attached drawings.

In the drawing, (1) is the exhaust passage of the engine, and (2) is the engine 2.
Class 20 air passage, (3) indicates a throttle valve in the passage (2); 1 The engine is connected to the exhaust passage (turbine (4) in
and a proa (5) in the II intake passage (2). This is provided with a waste gate pulp (8) that opens when the intake pressure in the intake passage (2) exceeds a predetermined value.

The pulp (8) is connected to the operating pressure N on the back side of a diaphragm or other pressure-responsive member αe via a rod (9).
aυ is communicated with the intake passage (2) through the working pressure passage a, and a front spring (13) is applied to the member Ql, so that the pressure within the pressure 110υ increases. Although the above is not much different from the conventional one, according to the present invention, the operating pressure passage a'J is always opened and the inside of the passage αa is opened. Leak control pulp α1 that communicates with the atmosphere
It will collapse. Furthermore, the pulp (I41f) is provided by dividing the leak passage A4 which communicates it with the atmosphere into the grade passage Q21, and facing the opening at the tip of the pulp (I41f). Other pressure-responsive members
is fixed in the fII direction, and communicates the inside of the sensing pressure chamber aη on the back side with the intake passage (2) via the sensing pressure passage (let), and further has a spring a9 on the front side that opens and repels the sensing pressure chamber aη. Thus, due to the increase in pressure inside the cough pressure chamber, the pressure chamber will close against the force of the pressure chamber.
I made it look like IIJ.

Furthermore, in the illustrated example, the member Qf9 is provided with a spring holder that closes the member Qf9 and propels it into the pulp, and an adjustment screw Qυ that adjusts the strength of the four springs. Furthermore, the leak passage 1 described above opens in the chamber 4 on the front side of the member Buddha Q, but the inside of the training chamber 1 is communicated with the atmosphere through the air cleaner (c) below. An orifice is interposed in the working pressure passage 0, and a check valve (c) and a storage tank (2) are further interposed on the upstream side of the orifice, if necessary.

The above-mentioned sensing pressure passage opens upstream of the venturi Is(2&) in the intake passage (2) as shown by the solid line, or opens upstream of the venturi mc2&) as shown by the dotted line.
It is optional, such as opening in a circle or on the downstream side thereof.

To explain its operation, when the intake pressure in the intake passage (2) increases, this is guided into the sensor pressure WLaD through the sensing pressure passage. Below this value, the leak con) roll pulp aLa is open, and thus the atmospheric pressure
51 The operating pressure chamber (wastegate because it is led into υ) through the operating pressure passage a4 does not operate.

When the pressure inside the cough pressure chamber (lη increases more than the expected value), the leak control pulp α in front of the cough pressure chamber (lη) closes, and according to this, the inside of the operating pressure passage 0 is disconnected from the atmosphere and enters the operating state. Therefore, the pressure in the intake passage (2) is equal to that of the passage a2.
The waste gate pulp (8) opens due to its increase. Thus, a part of the exhaust gas of the engine is led through the side passage (7), and the supply pressure in the core intake passage +27 is reduced accordingly.In this case, the wastegate pulp ( 8)
For example, the charge moves by the amount shown in Fig. 2, and the controlled boost pressure exhibits the characteristics as shown in Fig. 2 (I12).

In this way, when the intake pressure in the intake passage is reduced, the operating pressure in the operating pressure passage is adjusted by a part of the a-le valve, and accordingly, the waste gate F valve is closed/closed. Compared to the type in which the pressure inside the passage directly acts on the wastegate pulp to control the opening and closing of the wastegate pulp, the precision of the parts is reduced and the variation error of other parts is reduced. can be absorbed by the leak control pulp, so you only need to focus on the leak control pulp, and the variation width of the control boost pressure of individual engines with respect to the rotation speed is, for example, #! In Figure 2 (b) 1
2), and the control boost pressure characteristics can be improved as shown in the figure.

[Brief explanation of drawings]

Fig. 1 is an explanation of an example of the uninvented device, Fig. 2 is a 1M diagram of its operating characteristics, and Fig. 5 is an 8th diagram of the operating characteristics of a conventional example. (1)...-exhaust passage (2)...intake passage (4)
...Turbine (5j...Pua(6)e...Supercharger (7)--Side passage (8)...Wastegate pulp aυ・e・Working pressure chamber a・e・Working pressure passage I...Leak control pulp (1?)--
- Sensing pressure chamber 2...Outside sensing pressure passage 2
given name

Claims (1)

[Claims] x Engine II (-1) equipped with a supercharger consisting of a turbine in the exhaust passage and a proa in the 1 intake passage, and forming a side passage in parallel with the turbine in the exhaust passage to reduce the intake pressure in the intake passage. (1) in which the operating pressure passage on the back side of the waste gate pulp is connected to the intake passage, and the operating pressure passage is normally open and the inside of the passage is communicated with the atmosphere. A leak control valve is provided, and a sensing pressure chamber on the back side of the leak control pulp is communicated with the intake passage through a sensor pressure passage, so that when the pressure in the pressure chamber exceeds a predetermined value, the control valve is closed.
A wastegate pulp actuation 111III device which is configured to be closed when K is pushed.