KR20160033432A - A device for suppling an engine with air - Google Patents

Abstract

The present invention relates to a device for supplying an air to an engine, comprising: an exhaust gas recirculation (EGR) flow path; a turbo charger; a direction switching valve; and a compressor. The EGR flow path allows an exhaust gas discharged into the exhaust flow path to be moved to a suction flow path. The turbo charger is included in the suction flow path. The direction switching valve is positioned at a connection point where the EGR flow path and the suction flow path are connected. The compressor is included in the suction flow path to be positioned between the direction switching valve and the turbo charger. A flow path swiching valve and the compressor function as an EGR booster and a super charger, thereby simplifying the device and smoothly driving the turbo charger.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-

The present invention relates to an air supercharging apparatus for an engine, and more particularly, to an air supercharging apparatus for an engine that supplies compressed air to an intake manifold for increasing an output of the engine.

Generally, turbochargers and superchargers are used to increase the supercharging amount of air to increase the efficiency of the engine.

Turbocharger is a device that uses the energy of exhaust gas to rotate the turbine and pressurize the air by a compressor connected to the turbine. It can increase the output by increasing the efficiency of the engine by supplying pressurized air to the combustion chamber of the engine .

The supercharger is a device that receives power from the crankshaft and sucks air in order to solve the turbo rack generated by the turbocharger.

In addition to devices for increasing the output of the engine, devices for reducing air pollutants in the exhaust gas have been developed and an exhaust gas recirculation (EGR) device has been proposed to reduce the combustion temperature in the cylinder by recirculating a part of the exhaust gas to the intake system An exhaust gas cooler for cooling the exhaust gas discharged from the engine, an exhaust valve for opening and closing the exhaust gas passage, an exhaust valve for exhausting the exhaust gas when the pressure of the exhaust gas is lower than the pressure of the intake air, And an easy booster for forcedly circulating the gas so as not to flow backward.

In recent years, a device has been developed to adjust the idle rate while supercharging the air in a low-speed and high-load region where the output is rapidly reduced by applying the low-pressure idler and the supercharger simultaneously according to the miniaturization of the engine.

However, when the turbocharger, the supercharger, and the Isuzu device are applied to reduce the size of the engine and increase the efficiency and reduce the exhaust gas, there is a problem that the number of components increases and the control technology becomes complicated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the air supercharger of the conventional engine as described above, and it is possible to simplify the apparatus by performing the role of the oil change booster and the supercharger with one compressor, And to provide an air supercharging device of an engine which can smoothly drive even when the engine is cold.

According to an aspect of the present invention, there is provided an air supply apparatus for an engine,

A turbocharger that is branched on the exhaust passage and connected to the intake passage and moves the exhaust discharged to the exhaust passage to the intake passage, a turbocharger provided on the intake passage and supercharging air to the intake manifold of the engine, A direction switching valve which is provided at a connection point of the intake passage and opens and closes the air intake passage so that the air flowing into the intake passage from the outside and the exhaust of the air passage are mixed and introduced into the intake passage, A compressor for compressing the air in the intake passage, and a controller for controlling the direction switching valve and the compressor.

In the air supercharging device for an engine according to an embodiment of the present invention, the directional control valve may be provided with an adjustable opening / closing area of the idle flow passage.

In the air supercharging apparatus for an engine according to an embodiment of the present invention, when the exhaust gas amount is less than a preset idle rate when the idle mode is selected and the pressure of the idle flow passage is lower than the pressure of the intake passage, It is also possible to operate the compressor to suck exhaust gas of the flow path.

In the air supercharger of the engine according to the embodiment of the present invention, the controller may increase the rotation speed of the compressor compared with the case of the easy mode when the supercharging mode is selected.

In the air supercharging apparatus for an engine according to an embodiment of the present invention, a bypass flow path branched from the directional control valve and provided in parallel with the intake flow path such that air in the intake flow path bypasses the compressor and is supplied to the intake manifold of the engine, .

Preferably, the directional control valve is provided to guide the air flowing into the intake passage to the bypass passage.

In the air supercharging apparatus for an engine according to an embodiment of the present invention, when the turbocharging mode is selected, the controller operates the direction switching valve so that the air flowing into the intake passage flows into the bypass passage to bypass the compressor, It is also possible to stop.

In the air supercharging apparatus for an engine according to an embodiment of the present invention, the directional switching valve may be provided to selectively guide the exhaust gas of the idle flow passage to a bypass flow path or an intake flow path.

In the air supercharging apparatus for an engine according to an embodiment of the present invention, an easy al cooler for cooling the exhaust gas may be provided on the idle flow passage.

As described above, according to the air supercharger of the engine according to the present invention, the apparatus can be simplified by performing the role of the easy booster and the supercharger with one compressor, and by changing the flow path so as to bypass the compressor, There is an effect that it can be smoothly operated.

Brief Description of the Drawings Fig. 1 is a diagram showing an air supercharging apparatus for an engine according to an embodiment of the present invention;
Fig. 2 is a partial enlarged view of the air supercharging device of the engine shown in Fig. 1; Fig.
3 is a configuration diagram showing an air supercharging apparatus for an engine according to another embodiment of the present invention,
Figs. 4 to 6 are operational states of the air supercharger of the engine shown in Fig. 3. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

1 and 2, an air supercharging apparatus for an engine according to an embodiment of the present invention includes an exhaust line 14 for moving exhaust gas discharged to an exhaust line 12 to an intake line, A direction switching valve 30 provided at a connection point between the idle flow channel 14 and the intake flow passage 11 and a direction switching valve 30 on the intake flow passage 11, A compressor 40 provided between the turbochargers 21 and a controller 50 for controlling the directional valve 30 and the compressor 40. [

The idle oil passage 14 branches to the exhaust passage 12 and is connected to the intake passage 11. [ An easy-to-cooler (60) for cooling the exhaust gas is provided on the idle oil passage (14). The isalcohler 60 cools the exhaust gas flowing into the exhaust passage 14 from the exhaust passage 12 and recirculates the exhaust gas to the intake passage 11. [

A direction switching valve (30) is provided at a branch point where the idle flow channel (14) and the intake flow channel (11) intersect.

The directional control valve 30 is provided not only to open and close the canal passage 14 and the intake passage 11 to change the passage, but also to adjust the opening and closing area of the passage. That is, the directional control valve 30 is a proportional control valve capable of adjusting the opening / closing area. It goes without saying that the open / close valve of the simple opening / closing type corresponds to the directional switching valve of the present invention.

The directional control valve 30 opens and closes the intake and exhaust passages 11 and 14 so that air (external air) flowing into the intake passage 11 from the outside and exhaust gas (recirculating gas To be selectively introduced into the intake manifold 2 of the engine 1.

The directional control valve 30 controls the open / close area of the intake passage 11 and the clearance passage 14 in a proportional manner to mix the outside air and the recirculating gas into the intake manifold 2.

The turbocharger 21 is provided on the intake passage 11 to compress the air flowing into the intake passage 11 and supply the compressed air to the intake manifold 2 of the engine 1. A turbine 22 driven by the exhaust gas is provided in the exhaust flow path 12 to interlock the turbocharger 21. The turbocharger 21 is a type of compressor that receives rotational force from the turbine 22 and compresses the air on the intake flow passage 11.

A compressor (40) is provided on the intake passage (11) separately from the turbocharger (21). A compressor 40 provided separately from the turbocharger 21 is provided between the turbocharger 21 and the directional control valve 30. In this way, the compressor 40 is connected in series with the turbocharger 21 on the intake passage 11, and the control unit 50 can selectively or simultaneously operate the compressor 40 and the turbocharger 21.

The compressor 40 compresses the air on the intake passage 11 induced by the directional control valve 30 and forcibly conveys the air to the turbocharger 21. [ The compressor (40) is of the electric type capable of varying the rotation speed according to the operation mode.

The compressor 40 may also function as an easy booster or a supercharger. That is, when the compressor 40 is operated in the idle mode for the purpose of raising the idle rate, which is the mixing ratio of the recycle gas on the intake passage 11, the pressure difference between the intake passage 11 and the idle passage 14 And serves as an easy booster for forcedly sucking the recirculating gas. In addition, when the compressor 40 is operated to supercharge the outside air when the turbocharger 21 is not in the operating region (supercharging mode), the supercharger plays a role of forcibly sucking and sucking the outside air.

The control unit 50 controls the flow of air on the intake passage 11 and the bleed passage 14 by applying an opening / closing signal or a proportional control signal to the directional control valve 30. In addition, the control unit 50 applies the operation signal and the speed control signal to the compressor 40.

The operation of the control unit 50 according to the operation mode will be described.

When the ignition mode is selected , the controller 50 applies a proportional control signal to the directional control valve 30 so that the external air and the recirculating gas are mixed and introduced into the intake passage 11. At this time, the control unit 50 detects the air ratio of the mixed gas and also detects the pressure of the intake passage 14 and the intake passage 11.

The control unit 50 compares the detected idling ratio with a predetermined idling ratio and then compares the pressure of the idling passage 14 with the pressure of the intake passage 11 when the exhaust gas amount is less than a preset idling ratio, When the pressure of the idle oil passage 14 is lower than the pressure of the intake passage, an operation signal is applied to the compressor 40 to forcibly suck the exhaust gas of the oil passage 14 into the intake passage 11. [ In this way, in the easy mode, the compressor 40 serves as an easy booster for preventing backflow of the recycle gas.

When the pressure of the idle oil passage 14 is lower than the pressure of the intake passage, the controller 50 does not need to drive the compressor 40, but operates the rotation speed of the compressor 40 at a low speed It is possible.

The control unit 50 applies a proportional control signal for adjusting the open / close area according to a user's request.

When the supercharging mode is selected , the controller 50 adjusts the opening / closing area of the directional control valve 30 or completely closes the bleed passage 14 according to the user's request. In the supercharging mode, since the outside air flowing into the intake passage 11 is compressed and forcedly transferred, the controller 50 raises the rotational speed of the compressor 40 compared with the case of the easy mode.

Second Embodiment

3, the air supercharging apparatus for an engine according to another embodiment of the present invention includes a direction switching valve (not shown) so that the air in the intake passage 11 bypasses the compressor 40 and is supplied to the intake manifold 2 of the engine. And a bypass passage (15) branching to the intake passage (30) and arranged in parallel with the intake passage (11).

The directional control valve 30 of the present embodiment selectively guides the air flowing into the intake passage 11 to the bypass passage 15 or the intake passage 11.

That is, the directional control valve 30 can direct the mixed air of the external air and the recirculating gas to the bypass flow path 15, thereby transferring the compressor 40 to the turbocharger 21 side. The outlet of the bypass passage 15 may be closed to allow the mixed air to pass through the compressor 40 as in the first embodiment.

6, when the turbocharging mode is selected, the controller 50 controls the directional valve 30 so that the air flowing into the intake passage 11 flows into the bypass passage 15 and bypasses the compressor 40. [ And applies a control signal to stop the compressor (40). In the turbocharging mode, the compressor 40 is stopped and the turbocharger 21 is driven to compress the air.

The control unit 50 applies a signal for closing the bypass flow path 15 to the directional control valve 30 and the compressor 40 outputs a signal for closing the bypass flow path 15 in the first embodiment And applies a control signal according to the idle mode as described above.

5 shows a flow of air at the time of selecting the supercharging mode. The control unit 50 applies a signal for closing the bypass flow path 15 to the direction switching valve 30, The control signal according to the supercharging mode is applied as already described in the first embodiment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that the modification or the modification is possible by the person.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

11:
12:
14: Ijalu Euro
15: Bypass flow
21: Turbocharger
22: Turbine
30: Direction reversing valve
40: compressor
50:
60: Easy Al Cooler

Claims (9)

An exhaust line 14 branched to the exhaust line 12 and connected to the intake line 11 to move the exhaust gas discharged into the exhaust line 12 to the intake line;
A turbocharger (21) provided on the intake passage (11) for supercharging air to the intake manifold (2) of the engine;
The exhaust gas from the external air flow path 14 and the air introduced from the outside into the intake flow path 11 are mixed with each other to be introduced into the intake flow path 11 A direction switching valve (30) for opening and closing the idle flow passage (14) to be introduced;
A compressor (40) provided between the directional control valve (30) and the turbocharger (21) on the intake passage (11) and compressing the air in the intake passage (11); And
A controller for controlling the directional control valve 30 and the compressor 40;
And the air-cooling fan. 2. The apparatus according to claim 1, wherein the directional control valve (30)
And an opening / closing area of the air passage (14) is adjustable. The apparatus of claim 1,
When the exhaust gas amount is less than a preset idle ratio and the pressure of the idle passage 14 is lower than the pressure of the intake passage when the idle mode is selected and the exhaust gas of the idle passage 14 is sucked, To the engine (1). The apparatus of claim 1,
And increases the rotational speed of the compressor (40) when the supercharging mode is selected. The method according to claim 1,
A bypass flow path branched from the directional control valve 30 and provided in parallel to the intake flow path 11 so that the air in the intake flow path 11 bypasses the compressor 40 and is supplied to the intake manifold 2 of the engine 15). ≪ / RTI > 6. The apparatus according to claim 5, wherein the directional control valve (30)
Wherein the air introduced into the intake passage (11) is guided to the bypass passage (15). 7. The apparatus of claim 6,
When the turbocharging mode is selected, the air introduced into the intake passage 11 flows into the bypass passage 15 to actuate the directional control valve 30 to bypass the compressor 40 and to stop the compressor 40 And the air-fuel ratio of the engine. 6. The apparatus according to claim 5, wherein the directional control valve (30)
Characterized in that the exhaust gas of the internal combustion engine (14) is selectively introduced into the bypass passage (15) and the intake passage (11). The method according to claim 1,
And an idle al cooler (60) for cooling the exhaust gas is provided on the idle flow channel (14).

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