KR19990034231A - Vehicle Exhaust Gas Recirculation System - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation apparatus of a vehicle, and a general exhaust gas recirculation apparatus (EGR) is a means of reducing nitrogen oxides (NOx) in the exhaust gas and returns a part of the exhaust gas back to the intake system. (Recirculation), to reduce the combustion temperature when the mixture is burned by changing the air-fuel ratio of the intake air or to increase the specific heat to suppress the amount of nitrogen oxides produced, conventionally by using the exhaust gas by the temperature of the exhaust gas The present invention has the disadvantage of reducing the effect of the EGR by increasing the temperature to increase the combustion temperature. The present invention cools the exhaust gas recycled from the exhaust manifold, so that the cooled exhaust gas suppresses the increase of the intake temperature and burns. By lowering the temperature, the production of nitrogen oxides is suppressed to prevent air pollution and the performance of the vehicle. It will cost to improve.

Description

Vehicle Exhaust Gas Recirculation System

The present invention relates to a vehicle exhaust gas recirculation apparatus, and more particularly, by cooling the exhaust gas recycled from the exhaust manifold, the cooled exhaust gas suppresses the rise of the intake temperature and lowers the combustion temperature. By suppressing the production of air pollution, and to improve the performance of the vehicle.

Generally, as illustrated in FIG. 1, an intake pipe 4 and an exhaust pipe 5 are installed in an intake / exhaust device of a vehicle. The intake pipe 4 is for maintaining the balance of air upon intake, and the exhaust pipe 5 discharges the gas combusted from the cylinder 3 to the atmosphere. In addition, the exhaust pipe 5 and the intake pipe 4 are connected to an exhaust gas recirculation (EGR) pipe 1 so that an exhaust gas recirculation device for introducing a part of the exhaust gas into the intake pipe 4 is provided.

Exhaust gas recirculation (EGR) is a means of reducing nitrogen oxides (NOx) in the exhaust gas and returns part of the exhaust gas back to the intake system (recirculation) to change the air-fuel ratio of the intake air or By increasing the specific heat, when the mixer burns, the combustion temperature is lowered to suppress the production of nitrogen oxides.

In this way, the amount of exhaust gas returned to the intake pipe is controlled by the control valve 6 (EGR valve) controlled by the negative pressure near the throttle valve and the exhaust pressure in the exhaust pipe.

However, such an exhaust gas recirculation apparatus has a disadvantage of increasing the combustion temperature by reducing the effect of EGR by increasing the temperature of the intake air by the exhaust gas temperature by using the exhaust gas.

An object of the present invention is to solve such a problem, by cooling the exhaust gas recycled from the exhaust manifold of the vehicle, the cooled exhaust gas to suppress the rise of the intake temperature to lower the combustion temperature nitrogen The present invention provides a vehicle exhaust gas recirculation apparatus that can suppress the generation of oxide to improve the performance of a vehicle and prevent air pollution.

1 is a schematic view showing the installation state of the exhaust gas recirculation pipe of the vehicle

2 is a cross-sectional view according to a first embodiment of the present invention.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line B-B of FIG.

6 is a perspective view according to a third embodiment of the present invention;

7 is a sectional view showing the main parts according to the third embodiment of the present invention;

-Explanation of symbols for the main parts of the drawing-

1-EGR pipe (Exhaust Gas Recirculation Pipe)

2-coolant pipe 2 '-inlet

2 "-outlet 3-cylinder

4-intake pipe 5-exhaust pipe

Hereinafter, described in detail by the accompanying drawings of the present invention.

2 is a cross-sectional view according to the first embodiment of the present invention, Figure 3 is a cross-sectional view taken along the line A-A of FIG. As shown, in installing the EGR pipe 1 which comprises the exhaust gas recirculation apparatus of a vehicle, the cooling water pipe 2 is welded and installed in the outer periphery of the said EGR pipe 1. The cooling water pipe 2 is formed with an inlet port 2 'through which the coolant is supplied, and an outlet port 2 " through which the coolant is discharged.

4 is a cross-sectional view according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line B-B of FIG. 4. As shown in the drawing, welding of the coolant pipe 2 to the outer periphery of the EGR pipe 1 constituting the exhaust gas recirculation apparatus of the vehicle is the same as that of the first embodiment, but the inside of the coolant pipe 2 is Cooling by cooling water by forming a plurality of EGR pipes 1 having a small diameter and passing the exhaust gas through the plurality of EGR pipes 1 without forming an EGR pipe 1 located at a single pipe. You can maximize the effect.

6 is a perspective view according to a third embodiment of the present invention, Figure 7 is a cross-sectional view of the main part according to a third embodiment of the present invention. As shown, the EGR pipe 1 constituting the exhaust gas recirculation apparatus of the vehicle is configured similarly to the second embodiment, and two EGR pipes 1 are connected in parallel. Such a configuration can bring about a reduction effect of nitrogen oxides by increasing the flow rate of the exhaust gas in a narrow space to obtain a large flow rate. In addition, since the installation in a narrow space is easy, the same effect as installing a large single pipe in a large space can be obtained.

According to the present invention configured as described above, the coolant pumped by the coolant pump (not shown) is supplied to the inlet port 2 'of the coolant pipe 2 and discharged to the outlet port 2 " By cooling the exhaust gas around the exhaust gas, the exhaust gas cooled by the cooling water suppresses the increase in the intake temperature and lowers the combustion temperature, thereby suppressing the production of nitrogen oxides.

According to the exhaust gas recirculation apparatus of the vehicle according to the present invention as described above, by cooling the exhaust gas recycled from the exhaust manifold of the vehicle, the cooled exhaust gas suppresses the rise of the intake temperature and lowers the combustion temperature. By suppressing the production of nitrogen oxides to improve the performance of the car, there is an effect that can prevent air pollution.

Claims (3)

In the installation of the EGR pipe 1 constituting the exhaust gas recirculation apparatus of the vehicle, the cooling water pipe 2 is welded to the outer periphery of the EGR pipe 1, wherein the cooling water pipe 2 has one upper side. An inlet port 2 'is formed to supply coolant to the outlet, and an outlet port 2 " An exhaust gas recirculation apparatus for a vehicle, wherein the exhaust gas is cooled. The EGR pipe 1 located in the cooling water pipe 2 is formed of a plurality of EGR pipes 1 of small diameter, and the exhaust gas is discharged by the plurality of EGR pipes 1. An exhaust gas recirculation apparatus for a vehicle, characterized in that it is made to branch through. In the installation of the EGR pipe (1) constituting the exhaust gas recirculation apparatus of the vehicle, the exhaust gas recirculation apparatus of the vehicle, characterized in that the two EGR pipes (1) are connected in parallel.