JPH0466724A - Bypass device of engine - Google Patents

Abstract

PURPOSE:To make the arrangements of hoses for air bypass from an air bypass valve(ABV) easier, and the connection and disconnection of an ABV chamber easier, by providing the ABV to an intercooler outlet pipe, and the ABV chamber at the position at the upper part of an engine mechanism. CONSTITUTION:The pipes as air passages are arranged to feed the air to a supercharger 14 from an intake pipe 12a, and after cooling in an intercooler 16, to pass the air through an intercooler outlet pipe 18, a throttle body 20, and a surge tank 22, and then to feed to each cylinder of an engine main body 10 from an intake maniford 24. And an excessive air passage from an ABV 2 provided at the lower side of the intercooler outlet pipe 18 is arranged to let flow from the ABV 2 to the upper side, passing through an air bypass hose 8 provided along the intercooler outlet pipe 18, to let flow in an ABV chamber 6 at the upper side of a surge tank 22, and to return to the intake pipe 12a after passing through the air bypass hose 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a bypass device for a vehicle engine equipped with a supercharger, which reduces air vibrations generated in an air bypass valve (hereinafter referred to as ABV). The present invention also relates to a bypass device for a vehicle engine equipped with a supercharger that can effectively utilize the lower volume of the engine hood and improve the appearance of the engine.

[Conventional technology]

Recently, an increasing number of automobiles and other vehicles are equipped with superchargers to improve their engine performance.
For vehicles equipped with a supercharger, a vehicle in which an air bypass passage is provided in the air passage passing through the compressor of the supercharger has been proposed and put into practice.

As an example, in a control device for a supercharged internal combustion engine described in Japanese Patent Application Laid-Open No. 62-78430, an ABV is provided downstream of a compressor of the supercharger, and the internal pressure of a surge tank provided downstream of the compressor is detected. ABV is controlled and air downstream of the compressor is returned to the upstream of the compressor.

Further, FIG. 5 shows an example of a configuration diagram of a conventional supercharged vehicle engine provided with an air bypass passage.

In the figure, 114 is a supercharger, 104 is an air bypass hose, and an ABV installed in the middle of the air bypass hose.
By opening and closing, the air downstream of the compressor of the supercharger is returned to the upstream side of the compressor.

Further, 116 is an intercooler, and 120 is a cylinder head cover.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional vehicle engine bypass device, for example, in the arrangement shown in FIG. It is a reasonable location, and it is close to the compressor of the supercharger, making it easy to route air bypass hoses.

However, according to the above-mentioned engine bypass device, the supercharger is Air downstream of the compressor is taken out directly, but the temperature of the air downstream of the compressor is high.

Therefore, the material used for the ABV and the material for the hoses used for the air bypass passage must have the ability to withstand high temperatures.

Therefore, a means for lowering the return air temperature is required, but in the ABV position shown in Fig. 5, an appropriate means is provided in the vehicle engine compartment, which is required to be more compact. It was difficult.

Also, at the moment when the ABV operates and bypasses the air,
Air close to the speed of sound flows into the return air bypass passage,
Therefore, there is a problem in that airflow noise is generated and the sound generated by the vehicle is increased.

Therefore, in order to reduce this air flow noise and eliminate its influence, it is necessary to provide a muffler in the return air bypass passage, but this muffler requires a certain amount of volume for its function. However, as mentioned above, the engine compartments of modern vehicles, especially light vehicles, are becoming smaller and smaller, and the engines themselves are naturally required to be more compact, so it is difficult to secure space to mount a silencer. Ta.

[Purpose of the invention]

Therefore, an object of the present invention is to reduce the size of the engine compartment of a vehicle, which is becoming more compact and requires a specific shape in terms of external design and functionality. The purpose of the present invention is to provide an engine bypass device that lowers the temperature of air passing through an air bypass passage from an ABV while making effective use of a designated engine room, and enables the installation of a silencer.

[Means for solving problems]

In order to achieve this object, an engine bypass device according to the present invention includes an intercooler outlet pipe in a vehicle engine including a supercharger, an intercooler, a surge tank, and an air bypass passage of the compressor. An air bypass valve is provided in the air bypass valve, and an air bypass valve chamber provided in the middle of an air bypass passage connecting the air bypass valve to the upstream side of the compressor is installed at a position above the engine and engine peripheral equipment including the above-mentioned device. .

[Effect]

According to the engine bypass device having the above structure, AB
Install V on the intercooler outlet pipe, and AB
Since the V chamber is located at the top of the engine mechanism,
It is easy to route the air passage hoses from the ABV,
It is now possible to install an ABV chamber that has little effect on the engine external shape.

In addition, the ABV chamber can be easily attached and detached, and there is little impact on engine maintenance.

Therefore, it is possible to reduce the temperature of the air entering the air bypass passage from the ABV without enlarging the shape and size of the engine room, while maintaining an appropriate design, and to eliminate the influence of air flow noise generated in the air bypass passage due to ABV operation. did it.

〔Example〕

Next, embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of an air passage showing the configuration of an intake system of a vehicle engine to which the present invention is applied, and FIGS.
1 is a structural diagram showing an example of the appearance of a vehicle engine having the configuration shown in FIG. 1. FIG.

In Fig. 1, 12 is an air cleaner, 14a is a supercharger compressor, 16 is an intercooler, 18 is an intercooler outlet pipe, 20 is a throttle body, 22 is a surge tank, 24 is an engine intake manifold, 2 is an ABV, 4 is ABV out left hose, 6 is ABV chamber, 8 is ABV
7) It is a left horse. Further, 32 is an idle speed controller, and 34 is a silencer of the idle speed controller.

That is, the intake air that has passed through the air cleaner 12 is compressed by the compressor 14a, then cooled by the intercooler 6, passes through the intercooler outlet pipe 18, is controlled by the throttle body 20, and is removed from the pulsation in the surge tank 22. , is supplied to the intake manifold 24.

Further, as a result of the control in the throttle body 20, when the air pressure in the intercooler outlet pipe freezes to a predetermined pressure value, a control function (not shown) is activated to open ABV2 and output from the compressor 14a. Excess air is input into the ABV chamber 6 via the ABV out-left hose 4.

The air compressed by the compressor 14 and sent to the ABV outlet hose 4 by opening the ABV 2 has a shocking flow because it was compressed by the compressor 14a, but it is smoothed by the ABV chamber 6 and is sent to the ABV outlet hose 4. Sent to 8.

Since the ABV outlet hose 8 is connected to the air passage between the air cleaner 12 and the compressor 14a, the air flowing from the ABV 2 to the ABV outlet hose 4 is combined with the air taken in from the air cleaner 12. It is returned to the compressor 12.

Therefore, excess pressure is not supplied to the engine equipped with the supercharger, and there is no need to use high-temperature resistant materials for the ABV, air bypass hose, etc. It also does not increase engine noise.

Next, with reference to FIGS. 2 to 4, a description will be given of the structure of a vehicle engine in which the ABV chamber is mounted on the top of the surge tank in the configuration shown in FIG. 1.

Figure 2 is a top view of the engine, and Figure 3 is a top view of the engine.
It is a side view seen from the arrow A direction shown in the figure. In the figure, the disqualified direction F indicates the front of the engine. FIG. 4 is a front view of the engine as seen from the direction of defect B shown in FIG. 2. FIG.

In each figure from FIG. 2 to FIG. 4, 10 indicates the engine body, 2 is the ABV, 4 is the ABV out-left hose, 6 is the ABV chamber, 8 is the ABV out-left hose, and 12a is connected to the air cleaner. 14 is a typical supercharger turbocharger 16 is an intercooler, 18 is an intercooler outlet pipe, 20 is a throttle body,
22 is a surge tank, 24 is an intake manifold of the engine, and 40 is a front hood of the engine room. In this embodiment, the front hood is slanted forward.

That is, each element device is placed at a functionally appropriate position with respect to the engine.

Further, as shown in FIG. 3, the upper part of the engine mechanism in the ABV chamber attachment part is inclined parallel to the surface of the front hood.

That is, the lower surface of the ABV chamber 6 is a flat surface corresponding to the upper surface of the surge tank 22, and the upper surface of the ABV chamber 6 is flat when the ABV chamber is attached to the front hood 4.
It is shaped to have an inclination parallel to the 0 inclination.

Therefore, based on the present invention, the upper surface of the engine equipped with the ABV chamber is shaped to match the slope of the front hood, and the shape of the upper surface of the engine fitted with the ABV chamber is shaped to match the design shape required for the engine room of the vehicle body, and is appropriately shaped without creating wasted space. It can be made into a shape.

In addition, since the above-mentioned arrangement is adopted, each pipe including the air passage is connected to the air intake pipe 12a, so that the air taken into the air cleaner is supplied from the intake pipe 12a to the compressor of the supercharger 14, as shown in each figure. After being compressed by the compressor 14 and cooled by the intercooler 16 installed at the top of the engine, the intercooler outlet pipe 1
8. From the intake manifold 24 to the engine body 10 via the throttle body 20 and surge tank 22
It is possible to appropriately arrange between the respective element devices so that the fuel is supplied to each cylinder. Further, the excess air passage from ABV2 provided at the lower part of the intercooler outlet pipe 18 goes around from the ABV2 to the upper part, and passes through the air bypass hose 24 arranged along the intercooler outlet pipe 18 to the ABV2 at the upper part of the surge tank 22. It enters the chamber 6 and is further arranged to be returned to the intake vibe 12a via the air bypass hose 8.

Therefore, each element device can be connected in an appropriate arrangement without waste of each pipe as an air passage.

In other words, the ABV is located high in the engine, and
Since it is located approximately in the center, it is easy to route bypass hoses, etc.

In addition, in the above embodiment, the supercharger is described as a turbocharger, and the supercharger is installed on the top of the surge tank.
Although the engine hood has been described as being tilted forward, the structure and mounting position other than those described above, or the supercharger with element devices, or the engine shape and structure other than those described in the examples, or , The shape of the ABV chamber is set in accordance with the surface shape of the engine hood of the vehicle equipped with the engine, the shape and structure of the engine, and the shape and structure of each element device. Accordingly, the present invention can be applied.

In addition, the lower surface of the ABV chamber corresponds to the upper surface of the mounting position, and the upper surface of the ABV chamber is shaped to match the front hood surface of the vehicle in which it is mounted, making it possible to effectively utilize the lower volume of the front hood.

Furthermore, since the ABV chamber was attached to the top of the surge tank, the above-mentioned effects could be further enhanced. In addition, by making the projected surface of the ABV chamber attached to the top of the surge tank larger than the surge tank, parts around the surge tank can be hidden by the AVB chamber, which has the excellent effect of improving the appearance of the engine. can be obtained.

For example, if the front hood is tilted forward from the driver's seat, the shape of the ABV chamber can be adjusted to match the inclination of the front hood, making the driver's seat side higher and the front tilted lower. , the interior of the engine compartment can be used effectively to match the vehicle design.

In addition, the upper and lower surfaces of the ABV chamber become unparallel, resulting in
The resonant frequency of the BV chamber becomes complex and therefore A
Noise is not affected by the resonance of the BV chamber itself.

〔Effect of the invention〕

As explained above, in the engine bypass device according to the present invention, the ABV is provided in the intercooler outlet pipe, and the ABV chamber is arranged in the upper part of the engine mechanism, so it is easy to route the air passage hoses from the ABV. AB that has little effect on the engine external shape
It is now possible to install a V chamber. In addition, the ABV chamber can be easily attached and detached, and there is little impact on engine maintenance.

Therefore, it is possible to reduce the temperature of the air entering the air bypass passage from the ABV without enlarging the shape and size of the engine room, while maintaining an appropriate design, and to eliminate the influence of air flow noise generated in the air bypass passage due to ABV operation. did it.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of an air passage showing the configuration of the intake system of a vehicle engine to which the present invention is applied, and FIG. 2 is a top view of an external appearance example of the vehicle engine having the configuration shown in FIG. 1, viewed from above. , FIG. 3 is a side view of the engine seen from the direction of defect A shown in FIG. 2, and FIG. 4 is a front view of the engine shown in FIG. 2. FIG. 5 is a configuration diagram of a conventional supercharged vehicle engine provided with an air bypass passage. In the figure, 2 is the ABV, 4.6 is the ABV outlet hose, 10 is the engine body, 12a is the intake pipe, 14 is the supercharger, 14a is the supercharging compressor, 16
is the intercooler, 18 is the intercooler outlet pipe, 22 is the surge tank, and 40 is the front hood. Engraving of the drawing, Figure 1

Claims (1)

[Claims] 1. Supercharger, intercooler, surge tank,
An air bypass passage for the compressor, and an air bypass valve provided in the intercooler outlet pipe, and an air bypass valve chamber provided in the middle of the air bypass passage connecting the air bypass valve to the upstream side of the compressor. An engine bypass device, characterized in that it is installed above the engine and engine peripheral equipment including the above device.