JPH0466725A - Air bypass system of engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air bypass system for an engine, and particularly to an air bypass system for an engine that bypasses air downstream of an intercooler to the upstream side of a turbocharger.

[Conventional technology]

In conventional automobiles and other vehicles, an increasing number of vehicles are equipped with turbochargers to improve engine performance. Some are equipped with a connecting air bypass passage.

An example of such an engine is shown in FIG. 5.6. In the figure, 102 is an engine, 106 is a surge tank, 10B is a throttle body, and 110 is an air pipe that connects the air cleaner 112 and the throttle body 108. An air passage 118 is formed within the air pipe 110.

A turbocharger 114 and an intercooler 116 are sequentially provided in the air pipe 110 from the air cleaner 112 side. That is, the air pipe 110 is the first air pipe 1 between the air cleaner 112 and the turbocharger 114.
10-1, turbocharging 114 and intercooler 1
16 between the second air pipes 110-2 and the intercooler 116
and a third air pipe 110-3 between the throttle body 108.

Further, bypassing the turbocharger 114, the first air pipe 110-1 and the second air pipe 110-2 are connected by an air bypass pipe 124. An air bypass pulp (also referred to as ABV) 122 is interposed in the middle of the air bypass pipe 124 to adjust the suction pressure. In other words, the air bypass pipe 124 is connected to the second air pipe 110-2.
and the first air bypass pipe 1 between the air bypass valve 122 and the air bypass valve 122.
24-1, air bypass valve 122 and first air pipe 110
-1 and a second air bypass pipe 124-2.

Furthermore, as a control device for an internal combustion engine with a supercharger,
As disclosed in Japanese Patent No. 2-78430, an air bypass passage connects the upstream part of the compressor and a part between the compressor and the throttle valve, and a bypass valve provided in the air bypass passage according to the internal pressure of the surge tank. In a control device for a supercharged internal combustion engine, the valve control means controls when the surge tank internal pressure is below a first predetermined value, or when the surge tank internal pressure is at a second predetermined value greater than the first predetermined value. Some control systems perform control such that the bypass valve is opened when the value is abnormal, and closed when the value is between a first predetermined value and a second predetermined value.

Furthermore, as disclosed in Japanese Utility Model Application Publication No. 63-46628, an air bypass system for a supercharger includes a bypass passage that bypasses air downstream of the compressor to the upstream side of the compressor, and a bypass valve that opens and closes the bypass passage. A diaphragm that is formed by a first and second pressure chamber and opens and closes the bypass valve based on the pressure difference between the first and second pressure chambers, and a first diaphragm that introduces pressure into the first pressure chamber from an air passage upstream of the throttle valve. There is one that is provided with an introduction pipe and a second introduction pipe that introduces pressure into the second pressure chamber from the air passage downstream of the throttle valve.

[Problem that the invention seeks to solve]

By the way, in the conventional engine air bypass system, as shown in FIG.
An air bypass pipe 124 is provided that connects the middle of the first air pipe 110-1 that connects the air cleaner 112 and the turbocharger 114 to the middle of the first air pipe 110-1, and an air bypass valve 122 is interposed in the middle of this air bypass pipe 124 to connect the second air tube 110
-2 was supplied into the first air pipe 110-1.

As a result, the high-temperature air directly downstream of the turbocharger 114 passes through the air bypass pipe 124 and the air bypass valve 122, so the air bypass pipe 124, the air bypass valve 122, and the sealing members etc. of the air bypass valve 122 must be installed. A component (not shown) is required to have high heat resistance, and when forming the air bypass pipe 124, the air bypass valve 122, and the mounting member (not shown) of the air bypass valve 122, an expensive material with high heat resistance is required. This method requires the use of different materials, which increases manufacturing costs and is economically disadvantageous.

[Purpose of the invention]

Therefore, an object of the present invention is to provide an air bypass passage that connects the air passages between the upstream side of the turbocharger and the downstream side of the intercooler, and to open and close the air bypass passage in the middle of the air bypass passage to eliminate the above-mentioned disadvantages. By providing an on-off valve that only allows flow from the side to the upstream side of the turbocharger, the temperature of the air passing through the air bypass passage and on-off valve is lowered, thereby achieving the heat resistance required for the air bypass passage and on-off valve. An object of the present invention is to realize an air bypass system for an engine that can reduce the performance of the air bypass passage and the on-off valve.

[Means for solving problems]

To achieve this object, the present invention provides an engine in which an air cleaner, a turbocharger, an intercooler, and a surge tank are sequentially grown from the upstream side of the air passage, and the air passages between the upstream side of the turbocharger and the downstream side of the intercooler are connected. The present invention is characterized in that an air bypass passage is provided, and an on-off valve is provided in the middle of the air bypass passage to open and close the air bypass passage to allow flow only from the downstream side of the intercooler to the upstream side of the turbocharger.

[Effect]

With the above configuration, when the engine is driven, the air fed from the air cleaner side to the turbocharger side is pressurized by the turbocharger and then cooled by the intercooler. Air cooled by the intercooler on the downstream side of the intercooler is supplied to the upstream side of the turbocharger through an air bypass passage.

At this time, an on-off valve provided in the air bypass passage opens and closes the air bypass passage, allowing only flow from the intercooler downstream side to the turbocharger upstream side.

In addition, when forming the air bypass passage and the on-off valve,
By lowering the temperature of the air passing through the air bypass passage, the heat resistance of the air bypass passage and the on-off valve is lowered.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings.

1 to 4 show embodiments of this invention. 1st
In the figure, 2 is an engine and 4 is an intake manifold. An intake manifold 4 is interposed in the engine 2, and a throttle body 8 is attached to a surge tank 6 on the upstream side of the intake manifold 4. An air passage 18-4 is formed within this surge tank 6.

One end side of an air pipe IO is connected to the throttle body 8. The other end of this air pipe 10 is connected to an air cleaner 1.
Connected to 2.

A turbocharger 14 and an intercooler 16 are interposed in the air pipe 10 in order from the air cleaner 12 side. As a result, the air pipe 10 includes a first air pipe 1O-1 between the air cleaner 12 and the turbocharger 14, a second air pipe 10-2 between the turbocharger and the inktor 516 which becomes the air pipe on the inlet side of the intercooler, and a second air pipe 10-2 between the turbocharger and the inktor 516. 16, and a third air pipe 10-3 which becomes an outlet side air pipe of the ink cooler 16.

First to third air passages 18-1 to 18-3 are formed in the first to third air pipes 10-1 to 10-3, respectively.

The turbocharger 14 increases the amount of air supplied to a combustion chamber (not shown) of the engine 2 to improve engine output. The ink cooler 16 cools the pressurized air that has become hot in the turbocharger 14.

Also, during turbocharging 14 upstream side and intercooler 16
Air bypass passage 2 that connects the air passage 18 with the downstream side
0, and the air bypass passage 20 is opened and closed in the middle of the air bypass passage 20, and the intercooler 1
6. An air bypass valve (also called ABV) 22 is provided as an on-off valve that allows flow only from the downstream side to the upstream side during turbocharging.

In other words, the middle of the first air passage 10-1 connecting the air cleaner 12 and the turbocharger 14 and the intercooler 16
Third air pipe 1 connecting downstream side and throttle body 8
0-3 midway through an air bypass pipe 24. An air bypass passage 20 is formed within the air bypass pipe 24 .

Further, an air bypass valve 22 is provided in the middle of the air bypass pipe 24, and the air bypass valve 22
An air bypass valve chamber 26 is provided downstream of. In other words, the air bypass pipe 24 is connected to the third air pipe 1.
0-3 and the air bypass valve 22, and a second air bypass pipe 24-2 that connects the air bypass valve 22 and the air bypass valve chamber 26.
, the air bypass valve chamber 26 and the first air pipe 10-1.
and a third air bypass pipe 24-3 that connects the third air bypass pipe 24-3.

The air bypass valve chamber 26 reduces the noise caused by the person opening/closing the air bypass valve 22 when the air bypass valve 22 is operated.

Next, the effect will be explained.

When the engine 2 is driven, air fed from the air cleaner 12 side to the turbocharger 14 side is pressurized by the turbocharger 14 and then cooled by the intercooler 16.

The air downstream of the intercooler 16 cooled by the intercooler 16 is transferred to an air bypass passage 2 which is opened by the air bypass valve 22 when the turbocharger 14 decelerates.
0 is supplied to the upstream side of the turbocharger 14.

At this time, the air bypass valve chamber 26 provided downstream of the air bypass valve 22 reduces noise generated when the air bypass valve 22 is operated.

As a result, the air bypass passage 2o and the air bypass valve 2
2, and the air bypass passage 20 and the air bypass valve 22 can be formed without using expensive materials. It is economically advantageous because manufacturing costs can be reduced.

Furthermore, by reducing the heat resistance required for the air bypass passage 20 and the air bypass valve 22, the heat resistance required for the mounting members (not shown) such as the sealing material of the air bypass valve 22 can also be reduced. , this mounting member (not shown)
It is economically advantageous because the manufacturing cost can be reduced.

〔Effect of the invention〕

As explained in detail above, according to the present invention, an air bypass passage is provided that connects the air passages between the upstream side of the turbocharger and the downstream side of the intercooler, and the air bypass passage is opened and closed in the middle of the air bypass passage, so that the air bypass passage is opened and closed from the downstream side of the intercooler to the turbocharger. Since an on-off valve that only allows flow to the upstream side of the charger is provided, the heat resistance required for the air bypass passage and on-off valve is reduced, and the air bypass passage and on-off valve can be formed without using expensive materials. The manufacturing cost of the air bypass passage and the on-off valve can be reduced, which is economically advantageous.

[Brief explanation of drawings]

Figures 1 to 4 show embodiments of the present invention, Figure 1 is a schematic explanatory diagram of the air bypass system of the engine, Figure 2 is a schematic side view of the engine, and Figure 3 is a schematic illustration of the installation of the air bypass system. FIG. 4 is a schematic explanatory diagram of the engine. 5.6 shows the prior art of the present invention, FIG. 5 is a schematic explanatory diagram of an air bypass system of an engine, and FIG. 6 is a schematic explanatory diagram of the installation of the air bypass system. In the figure, 2 is the engine, 4 is the intake manifold, 6 is the surge tank, 8 is the throttle body, 10 is the air pipe,
12 is an air cleaner, 14 is a turbocharger, 16 is an intercooler, 18 is an air passage, 20 is an air bypass passage, 22 is an air bypass valve, 24 is an air bypass pipe, 2
6 is an air bypass valve chamber. Patent applicant: Suzuki Automobile Industry Co., Ltd.
Patent Attorney Yoshi Saigo (Procedural Amendment Form) August 18, 1990

Claims (1)

[Claims] 1. In an engine having an air cleaner, a turbocharger, an intercooler, and a surge tank sequentially from the upstream side of the air passage, an air bypass passage is provided that connects the air passage between the upstream side of the turbocharger and the downstream side of the intercooler, and the air bypass passage is provided. An air bypass system for an engine, characterized in that an on-off valve is provided in the middle to open and close the air bypass passage to allow flow only from the downstream side of the intercooler to the upstream side of the turbocharger.