KR19980048214A - Exhaust gas recirculation system of turbocharger engine - Google Patents

Abstract

More particularly, the present invention relates to an exhaust gas recirculation apparatus for recirculating a part of an exhaust gas to reduce nitrogen oxides. More particularly, the present invention relates to an exhaust gas recirculation apparatus applied to a turbocharged engine, The EGR valve 9 provided in the recirculation passage is connected to the suction tube 4a in front of the compressor 3 so that the EGR valve 9 provided in the recirculation passage is opened by the electronic control unit, The recirculation of the exhaust gas can always be realized simultaneously with the driving of the engine by utilizing the fact that the pressure is always smaller than the exhaust pressure at which the exhaust gas is recirculated. Therefore, the exhaust gas mixed with the intake air is supplied to the combustion chamber to lower the combustion temperature of the engine and reduce the harmful components of the exhaust gas.

Description

Exhaust gas recirculation system of turbocharger engine

The present invention is a recycling emission gas of the turbocharged engine; relates to (Exhaust Gas Recirculation EGR) device, more specifically, that in particular, recycling a portion of the exhaust gases to reduce the nitrogen oxides (NO _x) in exhaust gas reducing device To an EGR device of an electronic control system.

In general, according to the vehicle's exhaust system, the exhaust gas is water vapor (H ₂ O) is harmless to the human body is discharged from the combustion chamber, nitrogen (N _2), but also carbon dioxide gas (CO _2), carbon monoxide (CO), hydrocarbon (HC), But also a fluid material such as nitrogen oxides (NO _x ).

In order to reduce NO _x , which is a toxic substance in the above-mentioned exhaust gas, there has been known an EGR apparatus in which a part of exhaust gas is recirculated by an intake pipe to lower the temperature at the time of combustion.

The configuration of a conventionally known turbocharged engine in which the EGR device is installed is shown in detail in Fig.

The turbocharger engine is configured to increase the output of the engine by causing a large amount of air to be sucked into the cylinder, that is, supercharging the engine. The turbocharger engine 2 is driven by the pressure of the exhaust gas discharged to the atmosphere through the exhaust pipe 1 And the compressor 3 connected on the same axis as the turbine 1 supercharges the air flowing through the intake pipe 4 and forcibly supplies the air to the combustion chamber 5.

On the other hand, an EGR device for recirculating a part of the exhaust gas is provided between the exhaust pipe 1 and the intake pipe 4.

The EGR apparatus includes a recirculation passage 6 connected between the exhaust pipe 1 and the intake pipe 4 and an EGR valve 7 which is controlled by the electronic control unit ECU to open and close the recirculation passage 6 .

In the turbocharger engine, the EGR device draws a part of the exhaust gas (up to about 15% of the mixture) discharged from the combustion chamber 5 of the engine from the exhaust pipe 1 and supplies the EGR valve 7 , The air is sent to the intake pipe 4 by using the negative pressure of the intake system to be mixed with the fuel and air mixer and recirculated to the combustion chamber 5.

The exhaust gas recycled to the combustion chamber 5 lowers the filling rate of the new mixer and lowers the combustion temperature during the power stroke to reduce the amount of NO _x .

In the EGR apparatus of the above-described turbocharger engine, the recirculation passage of the exhaust gas is connected to the front side of the combustion chamber, that is, to the intake tube at the rear of the compressor, and is mixed with air introduced into the combustion chamber through the intake manifold.

However, since the conventional recirculated exhaust gas is operated only when it is higher than the intake pressure of the intake pipe of the exhaust pressure supplied from the exhaust pipe, there is a problem that recirculation of the exhaust gas becomes difficult when the pressure of the air compressed by the compressor is excessive .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide an exhaust gas recirculation system capable of always operating recirculation of exhaust gas irrespective of intake tubes, particularly intake tubes of intake manifolds, .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an exhaust gas recirculation apparatus of a general turbocharger engine. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an exhaust gas recirculation system for a turbocharger.

Description of the Related Art [0002]

1: Exhaust pipe 3: Compressor

4a: intake pipe 5: combustion chamber

8: recirculation passage 9: EGR valve

10: Filter

As a means for realizing the above-mentioned object, in the exhaust gas EGR apparatus of the turbocharger engine of the present invention, in order to make the recirculation of the exhaust gas always possible at the same time as the operation of the engine, the recirculation passage of the exhaust gas is provided in front of the compressor And connected to the intake pipe.

A filter for removing foreign matter contained in the exhaust gas is provided at an outlet of the recirculation passage of the exhaust gas connected to the intake pipe.

According to the structure of the present invention, the EGR device uses the fact that the pressure of the intake pipe on the front side of the compressor is always low, and when the EGR valve is opened by the ECU, .

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

[Example]

2 is an overall configuration diagram showing an EGR apparatus of a turbocharger engine according to the embodiment.

In describing the present embodiment, the same reference numerals are used for the configurations of the present embodiment which are the same as the drawings cited in the prior art, and will not be described again for clarity of explanation.

Reference numeral 1 denotes an exhaust pipe, 2 denotes a turbine installed in an exhaust pipe, 3 denotes a compressor provided in the intake pipe, 4a denotes an intake pipe, and 5 denotes a combustion chamber.

The turbocharger engine rotates the turbine 2 by using the pressure of the exhaust gas discharged into the atmosphere through the exhaust pipe 1 in order to suck a large amount of air into the combustion chamber 5 , The compressor 3 connected on the same axis as the turbine 1 supercharges the air introduced through the intake pipe 4a to be forcedly supplied to the combustion chamber 5. [

The EGR device of the present embodiment including the above-described configuration is configured such that the recirculation passage 8 is connected between the exhaust pipe 1 and the intake pipe 4a in front of the compressor 3, When the EGR valve 9 installed on the recirculation passage 8 is opened by the ECU using the fact that the pressure of the intake pipe 4a of the recirculation passage 8 is always lower than the exhaust pressure recirculated by the recirculation passage 8 , The exhaust gas is always recirculated.

On the other hand, in the EGR apparatus of the present embodiment, the foreign substances contained in the exhaust gas are introduced into the compressor 3 at the outlet of the recirculation passage 8 of the exhaust gas connected to the intake pipe 4a to pollute the compressor 3 In order to prevent a problem, a filler 10 is provided.

Based on the configuration of the present embodiment described above, a low pressure is formed on the front side of the compressor 3 of the intake pipe 4a when the engine is driven by the operation of the turbocharger. Therefore, when the EGR valve 9 is opened by the ECU, the recirculated exhaust gas is recirculated by the negative pressure of the intake pipe 4a without any resistance, and the exhaust gas is recirculated through the intake pipe 4a and the compressor 3 to the fuel and air To the combustion chamber (5).

The exhaust gas recirculated to the combustion chamber 5 lowers the filling rate of the new mixer and lowers the combustion temperature during the power stroke to reduce the amount of NO _x generated.

It will be appreciated that through the embodiments described above, the exhaust gas recirculation system of the turbocharger engine according to the present invention substantially obviates the problems of the prior art.

That is, according to the present invention, the negative pressure of the intake pipe is formed to be smaller than the exhaust pressure at which the exhaust gas is always recirculated, so that the exhaust gas can be recirculated at the same time as the engine is driven.

Therefore, the exhaust gas mixed with the intake air is supplied to the combustion chamber to lower the combustion temperature of the engine, reduce the harmful components of the exhaust gas, and reduce the air pollution degree.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. .

Claims (2)

1. A turbocharged engine in which a turbine is rotated using a pressure of exhaust gas discharged through an exhaust pipe, a compressor interlocked with the turbine supercharges air introduced through an intake pipe, and forcibly supplies the air to a combustion chamber, A recirculation passage connected between the exhaust pipe and an intake tract in front of the compressor; and an EGR valve installed in the recirculation passage and controlled by the electronic control unit to open and close; Wherein exhaust gas recirculation is always enabled at the same time when the engine is driven when the EGR valve is opened by utilizing the fact that the pressure of the intake pipe on the front side of the compressor is always low. The exhaust gas recycling apparatus of claim 1, wherein a filter is installed at an outlet of a recirculation passage of the exhaust gas connected to the intake pipe.