JP2751584B2 - Engine bypass device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a bypass device for a vehicle engine equipped with a turbocharger, and reduces vibration of air generated in an air bypass valve (hereinafter referred to as ABV). Also, the present invention relates to a bypass device for a vehicle engine equipped with a supercharger capable of effectively utilizing the lower volume of an engine hood and improving the appearance of the engine.

[Conventional technology]

Recently, in vehicles such as automobiles, vehicles equipped with a supercharger have been increasing in order to improve the engine performance, and vehicles equipped with a supercharger have an air passage passing through a compressor of the supercharger. Provided with an air bypass passage is proposed and put into practical use.

As one 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 a supercharger, and the pressure in a surge tank provided downstream of the compressor is detected to detect the pressure. It controls the ABV and returns the air downstream of the compressor to the upstream of the compressor.

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

In the figure, reference numeral 114 denotes a supercharger, and 104 denotes an air bypass hose. The air downstream of the compressor of the supercharger is returned to the upstream of the compressor by opening and closing an ABV provided in the middle of the air bypass hose.

Reference numeral 116 denotes an intercooler, and 120 denotes a cylinder head cover.

[Problems to be solved by the invention]

According to the above-mentioned conventional vehicle engine bypass device,
For example, in the arrangement shown in FIG. 5, the ABV is provided above the cylinder head cover, and is an appropriate place in the engine room for vehicles where recent conversion is required. It is easy to handle air bypass hoses near the compressor of the machine.

However, according to the above-described engine bypass device, the supercharger of the supercharger is not used in both the example shown in the control device of the supercharged internal combustion engine described in JP-A-62-78430 and the example shown in FIG. Although the air downstream of the compressor is directly taken out, the temperature of the air downstream of the compressor is high. Therefore, the material used for the ABV and the material used for the hose used for the air bypass passage must have a property that can withstand high temperatures.

For this purpose, a means for lowering the return air temperature is required. At the position of the ABV shown in FIG. 5, an appropriate means is provided in the engine room for the vehicle, which is required to be compact. It was difficult.

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

Therefore, in order to reduce the air flow noise and eliminate the effect, it is necessary to provide a muffler in the return air bypass passage, but this muffler requires a certain volume or more in function. However, as mentioned earlier, recent vehicles,
In particular, the engine room of mini cars is becoming smaller,
Since the engine itself naturally needs to be compact,
It was difficult to secure space for mounting the silencer.

[Object of the invention]

Therefore, an object of the present invention is to reduce the size,
In the engine room of a vehicle where a specific shape is also demanded in terms of the external shape and function of the vehicle, the ABV is used while effectively utilizing such a narrow and specified engine room. It is an object of the present invention to provide an engine bypass device that lowers the temperature of air passing through an air bypass passage from a vehicle and enables mounting of a muffler.

[Means for solving the problem]

In order to achieve this object, in an engine bypass device according to the present invention, an intercooler outlet pipe is provided for a vehicle engine including a supercharger, an intercooler, a surge tank, and an air bypass passage of the compressor. 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 mounted at an upper position of an engine and peripheral devices including the above-mentioned device. .

[Action]

According to the engine bypass device having the above structure, AB
V was installed in the intercooler outlet pipe, and the ABV chamber was located at the top of the engine mechanism.
It is easy to handle hoses for air passages from, and it is now possible to install an ABV chamber that has little effect on the external shape of the engine. The ABV chamber can be easily attached and detached, and has little effect on engine maintenance.

Therefore, it is possible to reduce the temperature of the air entering the air bypass passage from the ABV and reduce the effect of the air flow noise generated in the air bypass passage by the operation of the ABV without increasing the shape and size of the engine room and keeping the appropriate design. did it.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of an air passage showing the structure of an intake system of a vehicle engine to which the present invention is applied, and FIGS. 2 to 4 show examples of the appearance of a vehicle engine having the structure shown in FIG. FIG.

In FIG. 1, 12 is an air cleaner, 14a is a compressor of a supercharger, 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 ABV, 4 is ABV outlet hose,
6 is an ABV chamber and 8 is an ABV outlet hose. Reference numeral 32 denotes an idle speed controller, and reference numeral 34 denotes 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, and then compressed by the intercooler 6.
Cooled by the intercooler outlet pipe 18, the operation of the throttle body 20 is controlled,
After pulsation is taken in the surge tank 22, the pulsation is supplied to the intake manifold 24.

As a result of the control in the throttle body 20, when the air pressure in the intercooler outlet pipe freezes at a predetermined pressure value, a control function (not shown) operates to open the ABV2 and output from the compressor 14a. Extra air flows through the ABV outlet hose 4 to A
Input to the BV chamber 6.

The air compressed by the compressor 14 and sent to the ABV outlet hose 4 by opening the ABV 2 is:
Although the flow is shocking because it has been compressed by the compressor 14a, it is smoothed by the ABV chamber 6 and sent to the ABV outlet hose 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 returned to the compressor 12 together with the air sucked from the air cleaner 12.

Therefore, no excessive pressure is supplied to the engine provided with the supercharger, and it is not necessary to use a high-pressure resistant material for the ABV and the air bypass hose. Also, there is no increase in engine noise.

Next, the structure of the vehicle engine in an example in which the ABV chamber is mounted on the upper part of the surge tank in the configuration shown in FIG. 1 will be described with reference to FIGS.

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

2 to 4, 10 indicates an engine body, 2 is an ABV, 4 is an ABV outlet hose,
6 is ABV chamber, 8 is ABV outlet hose, 12a
Is an intake air intake pipe connected to an air cleaner, 14 is a turbocharger which is a typical supercharger, 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 an engine room. In the present embodiment, an example in which the front hood is inclined forward is shown.

That is, each element device is disposed at a position functionally appropriate for the engine.

Also, as shown in FIG. 3, the upper part of the engine mechanism of the mounting portion of the ABV chamber 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
It is shaped so as to be parallel to the front hood 40 when the BV chamber is mounted.

Therefore, the upper surface inclination of the engine equipped with the ABV chamber according to the present invention is formed in accordance with the inclination of the front hood, and has an appropriate shape that does not produce useless space according to the design shape required for the engine room of the vehicle body. It can be.

Further, since the above-described arrangement is adopted, the air sucked into the air cleaner is also supplied to the compressor of the supercharger 14 from the intake pipe 12a, as shown in the respective drawings, for the pipes as the air passages. Compressed by the compressor of
After being cooled by the intercooler 16 arranged at the upper part of the engine, each element is supplied from the intake manifold 24 to each cylinder of the engine body 10 via the intercooler outlet pipe 18, the throttle body 20, and the surge tank 22. Appropriate arrangement can be provided between the devices. Also, intercooler outlet pipe 18
The excess air passage from ABV2 provided in the lower part of the
It is arranged so as to enter the ABV chamber 6 above the surge tank 22 via an air bypass hose 24 arranged along the line and return to the intake pipe 12a via the air bypass hose 8.

Accordingly, each element device can be connected in an appropriate arrangement without wasting each pipe as an air passage.

That is, the ABV is located at a high position on the engine, and
Since it is arranged substantially at the center, it is easy to handle the bypass hose and the like.

Further, in the above-described embodiment, the turbocharger is described as a turbocharger, and the turbocharger is mounted on the surge tank, and the engine hood is inclined forward. And the mounting position, or a supercharger provided with the element device, or the engine shape and structure other than those described in the embodiment, or the surface shape of the engine hood of the vehicle equipped with the engine, the surface shape of the engine hood, The present invention can be applied by setting the shape of the ABV chamber according to the shape and structure of the engine and the shape and structure of each element device.

In addition, the lower surface of the ABV chamber was made to correspond to the upper surface of the mounting position, and the upper surface of the ABV chamber was shaped to match the front hood surface of the mounted vehicle, so the lower volume of the front hood could be used effectively.

Furthermore, the above-mentioned effect was able to be further improved because the ABV chamber was mounted on the upper part of the surge tank. In addition, by making the projection surface shape of the ABV chamber mounted on the upper part of the surge tank larger than the surge tank, the parts around the surge tank can be hidden in the AVB chamber, and the excellent effect that the appearance of the engine becomes better Can be obtained.

That is, for example, when the front hood is inclined so as to be lowered forward from the driver's seat, the shape of the ABV chamber is adjusted to the inclination of the front hood, the driver's seat side is raised, and the front is tilted lower. According to the vehicle design, the engine room can be effectively used.

Also, the upper and lower surfaces of the ABV chamber become
The resonance frequency of the chamber is complicated, so that the resonance of the ABV chamber itself has no effect on the noise.

〔The invention's effect〕

As described 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 disposed at the upper position of the engine mechanism. It is now possible to install an ABV chamber that has little effect on the engine shape. The ABV chamber can be easily attached and detached, and has little effect on engine maintenance.

Therefore, it is possible to reduce the temperature of the air entering the air bypass passage from the ABV and reduce the effect of the air flow noise generated in the air bypass passage by the operation of the ABV without increasing the shape and size of the engine room and keeping the appropriate design. did it.

[Brief description of 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 FIG. 2 is a top view of an external appearance example of the vehicle engine having the configuration shown in FIG. FIG. 3 is a side view of the engine seen from the direction of arrow A shown in FIG. 2, and FIG. 4 is a front view of the engine shown in FIG. FIG. 5 is a configuration diagram of a conventional vehicle engine with a supercharger provided with an air bypass passage. In the figure, 2 is an ABV, 4 and 6 are ABV outlet hoses, 10 is an engine body, 12a is an intake pipe, 14 is a supercharger, 14a is a supercharged compressor, 16 is an intercooler, 18 is an intercooler outlet pipe, and 22 is Surge tank, 40 is a front hood.

Claims (1)

(57) [Claims] 1. An engine for a vehicle comprising a supercharger, an intercooler, a surge tank, and an air bypass passage for the compressor, wherein an air bypass valve is provided in an intercooler outlet pipe, and the air bypass valve is connected to the compressor by the air bypass valve. An engine bypass device, wherein an air bypass valve chamber provided in the middle of an air bypass passage connecting the upstream side is mounted at an upper position of an engine and an engine peripheral device including the above device.