KR19990015078A - Exhaust gas recirculation system of car with purification function - 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 having a purification function, wherein a part of the combustion gas from a combustion chamber to a surge tank is reduced between a combustion chamber and a surge tank in order to reduce harmful components such as nitrogen oxides of the exhaust gas in the engine exhaust gas. By disposing the purifying means in all stages of the EGR valve on the EGR pipeline, it is possible to effectively reduce the carbon and oil contained in the combustion gas so as to prevent malfunction of various valves mounted on the surge tank. There is a purpose.

In order to achieve the above object, the present invention is provided so that both ends thereof communicate with the surge tank 3 and the combustion chamber 1, respectively, on the intake manifold 2 forming the intake passage in the combustion chamber 1, respectively. In the exhaust gas recirculation apparatus of an automobile composed of an EGR line (4) and an EGR valve (5) mounted on the EGR line (4), in the EGR line (4) to which the EGR valve (5) is mounted. An EGR line 4 adjacent to the combustion chamber 1 has a housing 8 connected at both ends through the EGR line 4 and a pipe member 7, and an element mounted inside the housing 8. It is characterized in that the purifying means (6) consisting of 9) is installed.

Description

Exhaust gas recirculation system of car with purification function

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation apparatus of an automobile, and in particular, a purification means is installed at the front stage of an EGR valve of an exhaust gas recirculation apparatus to effectively reduce carbon and oil components of combustion gas re-introduced into the intake pipe, so that the surge tank The present invention relates to a vehicle exhaust gas recirculation device having a purification function capable of preventing malfunctions of various valves mounted thereon.

In general, the exhaust gas of an automobile is largely classified into an evacuation-orative gas, a blow-by gas, and an exhaust gas, depending on the emission source. The gasoline in the fuel tank is evaporated and released into the atmosphere, and its main component is the same composition as the hydrocarbon (HC) of the fuel used.

In addition, the blow-by gas is a crankcase discharge in which the combustion chamber's mixer or unburned gas flows into the crankcase through a gap between the piston and the cylinder, and the composition thereof is mostly unburned hydrocarbon (HC), and the remainder is combustion gas and Incomplete combustion of mixed gas.

In addition, the exhaust gas is a mixture of fuel and air is combusted in the cylinder of the engine and then released into the atmosphere through the exhaust manifold and the exhaust pipe of the exhaust system, which is generally used as fuel in an internal combustion engine of an automobile. Since most of them are mixtures of hydrocarbons, if the combustion is not completed in the cylinder, inevitably, noxious substances are inevitably released. ) And nitrogen oxides (NO _X ).

Therefore, measures to reduce various emissions have to be taken for automobiles, and as part of the measures to reduce the evaporation gas, the gasoline evaporated gas generated from the mixer forming apparatus or the fuel tank is temporarily stored and then sent to the intake pipe of the engine for combustion. In order to reduce the blow-by gas, a method of reducing the blow-by gas from the crankcase or the cylinder head to the intake cylinder (blow-by-gas reduction device) was common. Various methods such as improvement of engine, improvement of formation mechanism at mixing, improvement of ignition device and control of ignition timing, adoption of aftertreatment system, etc. have emerged.

Meanwhile, an exhaust gas recirculation device is one of the measures to reduce the exhaust gas, and the exhaust gas recirculation device intakes some of the unburned exhaust gas discharged through the exhaust system when the engine is operated again. It was sent to the system to reduce the filling rate of the new mixer in the combustion chamber to lower the combustion temperature during power administration to reduce the amount of nitrogen oxides in the exhaust gas, as shown in Figure 1, the intake passage in the combustion chamber (1) An independent EGR line 4 is provided on the intake manifold 2 to be formed so that both ends thereof communicate with each of the surge tank 3 and the combustion chamber 1, and an EGR valve (4) on the EGR line 4 is provided. 5) is installed.

Therefore, when the EGR valve 5 introduces a part of the exhaust gas (approximately 15% of the mixer) from the combustion chamber 1 through the EGR line 4 and into the surge tank 3 again, the surge tank 3 The exhaust gas flowed back into the combustion chamber 1 again through the intake manifold 2, and the filling rate of the mixer in the combustion chamber 1 is lowered, so that the combustion temperature of the mixer in the combustion chamber 1 is low during power administration. As a result, the amount of nitrogen oxides in the exhaust gas is significantly reduced.

However, in the exhaust gas recirculation apparatus of the vehicle as described above, since the exhaust gas flowing into the surge tank 3 through the EGR line 4 in the combustion chamber 1 contains some carbon and oil components, Various carbon and oil components of the exhaust gas are deposited in a large amount on the nipples (for example, EGR valves, purge control solenoid valves, and thermal valves) mounted to be connected to various valves mounted on the surge tank 3. There was a disadvantage that causes malfunction of the valves.

Accordingly, the present invention has been made to solve the above drawbacks, the supply of a portion of the combustion gas from the combustion chamber to the surge tank between the combustion chamber and the surge tank to reduce harmful components such as nitrogen oxides of the exhaust gas in the exhaust gas of the engine. Purification means are provided on the EGR pipeline to prevent the malfunction of various valves mounted on the surge tank by effectively reducing the carbon and oil contained in the combustion gas. The purpose of the present invention is to provide an exhaust gas recirculation apparatus for a vehicle.

1 is a schematic cross-sectional view showing an exhaust gas recirculation apparatus of a conventional vehicle;

2 is a schematic cross-sectional view showing an exhaust gas recirculation apparatus of a vehicle according to the present invention;

3 is a cross-sectional view showing the purifying means that is the main part of the present invention;

4 is a cross-sectional view of the element shown in FIG. 3.

Explanation of symbols for the main parts of the drawings

1-Combustion chamber 2-Intake manifold

3-surge tank 4-EGR pipeline

5-EGR valve 6-purification means

7-pipe member 8-housing

9-element 10-pipe connecting member

In order to achieve the above object, the present invention provides an EGR pipeline having both ends connected to a surge tank and a combustion chamber, respectively, on an intake manifold forming an intake passage in a combustion chamber, and mounted on the EGR pipeline. In the exhaust gas recirculation apparatus of an automobile composed of an EGR valve, in the EGR pipeline adjacent to the combustion chamber in the EGR pipeline equipped with the EGR valve, a housing having both ends connected through the EGR pipeline and the pipe member, Characterized in that the purifying means consisting of elements mounted inside.

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

Figure 2 is a schematic cross-sectional view showing the exhaust gas recirculation device of the vehicle according to the present invention, Figure 3 is a cross-sectional view showing the purifying means that is the main part of the present invention, Figure 4 is a cross-sectional view of the element shown in FIG. The same reference numerals will be given together with the same reference numerals as before.

The present invention, as shown in the figure, is provided so that the two end portions on the intake manifold (2) forming the intake passage in the combustion chamber (1) so as to communicate with the surge tank (3) and the combustion chamber (1), respectively. It consists of an EGR line (4) and an EGR valve (5) mounted on the EGR line (4), and sends some of the unburned exhaust gas discharged through the exhaust system when the engine is running to the intake pipe again. In the exhaust gas recirculation apparatus of an automobile designed to reduce the amount of nitrogen oxides in the exhaust gas by lowering the filling rate of the new mixer in the combustion chamber and thus lowering the combustion temperature during power administration, the EGR line (4) equipped with the EGR valve (5) The purification means 6 is provided in the EGR line 4 adjacent to the combustion chamber 1 in the combustion chamber 1.

Wherein the purification means (6) is connected to the two ends of the EGR pipe line 4 and the flexible pipe line member (7) of the hose connected to each other while being screwed together as a separate member (8) And the elements 9 of the filters mounted inside the housing 8.

And the coupling of the EGR pipe line 4 and the pipe member (7) connected to the housing (8) of the purifying means (6) is made through the pipe connecting member (10) of the nipples.

On the other hand, the element 9 of the filter element mounted in the housing 8 of the purifying means 6 is folded in a corrugated form in the longitudinal direction of the member, as shown in FIG. The contact area between the carbon component and the oil component contained in the exhaust gas passing through the gas is increased so that the carbon component and the oil component contained in the exhaust gas can be adsorbed effectively.

Therefore, the purification means 6 installed in the EGR pipeline 4 equipped with the EGR valve 5 as described above is exhaust gas flowing into the surge tank 3 through the EGR pipeline 4 in the combustion chamber 1. Particularly, some carbon and oil components contained in the gas can be adsorbed effectively, and the exhaust gas from which carbon and oil components have been removed is introduced into the surge tank 3, and reintroduced into the combustion chamber 1 through the intake manifold 2 again. In this case, the filling rate of the mixer in the combustion chamber 1 is lowered, the combustion temperature of the mixer is lowered, and the amount of nitrogen oxides in the exhaust gas is remarkably reduced, so as to be connected to various valves mounted on the surge tank 3. Since the installed nipples do not deposit carbon and oil components as in the prior art, malfunctions of various valves are not caused.

As described above, according to the exhaust gas recirculation apparatus of a vehicle having a purification function according to the present invention, a part of the combustion gas between the combustion chamber and the surge tank to reduce harmful components such as nitrogen oxides in the exhaust gas discharged during operation of the engine. By disposing the purifying means on the EGR pipeline provided to supply fuel from the combustion chamber to the surge tank, the carbon and oil components contained in the combustion gas can be effectively reduced to prevent malfunction of various valves mounted on the surge tank. Will be.

Claims (3)

An EGR line 4 provided on both sides of the intake manifold 2 forming an intake passage in the combustion chamber 1 so as to communicate with the surge tank 3 and the combustion chamber 1, and this EGR line 4 In the exhaust gas recirculation apparatus of an automobile composed of an EGR valve (5) mounted on the top, In the EGR pipeline 4 adjacent to the combustion chamber 1 of the EGR pipeline 4 on which the EGR valve 5 is mounted, a housing 8 having both ends connected to the EGR pipeline 4 and the pipe member 7 through the housing 8. And a purifying means (6) consisting of an element (9) mounted inside the housing (8). The method of claim 1, wherein the EGR pipe 4 and the pipe member 7 connected to the housing 8 of the purifying means 6 is coupled via a pipe connecting member 10 for airtightness. Exhaust gas recirculation system of automobile with purification function. 2. The exhaust gas recirculation apparatus of a vehicle according to claim 1, wherein the elements (9) mounted in the purifying means (6) are folded in a corrugated form so as to enlarge the surface area in the longitudinal direction of the member.