KR19990029790U - Vehicle emission control system - Google Patents

Abstract

Disclosed is an exhaust gas control system of an automobile in which the structure of the blowby gas and the engine oil in the rocker cover is prevented from flowing into the intake cylinder of the engine due to the instantaneous negative pressure. The exhaust gas control system is provided at an intake hose 500 provided so that one end of the rocker cover 100 and the EGR valve 200 communicate with each other, and an EGR operating section between the EGR valve 200 and the intake hose 500. And a blow-by in the rocker cover 100 by the flap 300 which can be opened and closed by an electronically controlled actuator and the instantaneous negative pressure generated in the intake hose 500 during the open operation of the flap 300. It is provided with a negative pressure plate 400 for temporarily blocking the intake of gas into the intake cylinder.

Description

Vehicle emission control system

The present invention relates to an exhaust gas control system of an automobile, and in particular, by providing a negative pressure plate to temporarily block the instantaneous negative pressure generated due to the negative pressure difference between the inside of the rocker cover and the intake hose, resulting from excessive intake of blow-by gas and engine oil. The present invention relates to a vehicle exhaust gas control system capable of improving engine performance and exhaust gas performance by reducing smoke.

In recent years, the problem of public pollution has been raised globally.

Among the causes of such pollution, in particular, the harmful gas in the exhaust gas emitted from automobiles is the cause of the largest pollution, and recently, exhaust gas regulation has been strictly performed to reduce the pollution caused by the exhaust gas of automobiles. .

Therefore, various methods for purifying harmful gas in exhaust gas emitted from automobiles have been proposed.

Such a control system of exhaust gas is composed of three systems: a crankcase emission control system, an evaporative control system, and an exhaust control system. .

The exhaust gas control device includes a secondary air supply device, an exhaust gas recirculation (EGR), a jet air device, and the like.

Among them, the exhaust gas recirculation device (hereinafter abbreviated as EGR device) is a device for reducing NO ', especially in the exhaust gas, and has a structure in which a part of the exhaust gas is recycled from the exhaust hole of the cylinder head to the hole provided in the intake manifold. , EGR valve, vacuum regulating valve, thermo valve and so on.

Meanwhile, the crankcase exhaust gas control device is provided to prevent the blow-by gas from being released into the atmosphere. For example, the crankcase exhaust gas control device employs an EGR applied engine. An intake hose 50 is provided to communicate with one end of the exhaust gas recirculation valve (hereinafter abbreviated as EGR valve), and is provided in an EGR operating section between the EGR valve 10 and the intake hose 50. It is provided with the flap 20 which can be opened and closed by ON / OFF operation | movement by the predetermined actuator 30. FIG.

The actuator 42 is controlled by the electronic control unit E.C.U.44 to turn on / off the flap 20 so as to determine when to apply the vacuum negative pressure of the EGR valve 10.

In addition, the relationship between the flap 20 and the EGR valve 10 is such that when the flap 20 is turned off, the EGR valve 10 is opened and the exhaust gas flows into the intake pipe, and the flap 20 is turned on. The EGR valve 10 is closed and the blow-by gas inside the rocker cover 30 flows into the combustion chamber 60 through the intake pipe.

In the conventional exhaust gas control system having such a structure, when the flap 20 is turned on when the engine is driven, the EGR valve 10 is closed and the vacuum negative pressure is generated in the EGR operating section, and thus the relative to the intake hose 50. Vacuum negative pressure is generated, and then the blow-by gas in the rocker cover 30 above the cylinder head is supplied to the EGR valve 10 side through the intake hose 50.

Therefore, the blow-by gas supplied to the EGR valve 10 flows into the intake pipe of the intake manifold through the closed EGR valve 10 and is supplied into the combustion chamber 60.

Such a conventional exhaust gas control system has a useful function of recycling the blow-by gas generated when the engine is driven to the intake cylinder, but has the following problems.

Originally, the engine engine has a structure in which the flap 20 opens at a predetermined speed or more so that blow-by gas flows into the combustion chamber 60, but the flap 20 is closed at low speed of the engine. Is instantaneously opened by the actuator 42, an instantaneous negative pressure having a predetermined suction force is generated in the intake hose 50, whereby the blow-by gas and the engine oil filled in the rocker cover 30 are inhaled. Excessive suction is taken into the intake pipe into the intake system.

Therefore, the blow-by gas and the engine oil are combusted in the combustion chamber 60, so that the smoke increases. As a result, the output performance of the engine decreases, the concentration of the exhaust gas increases, and the engine oil is consumed.

The present invention has been devised in view of the above-mentioned problems, and its purpose is to cut off the instantaneous negative pressure generated in the intake hose during the instantaneous opening of the flap during low-speed operation of the engine so that blow-by gas and engine oil are excessively blown into the combustion chamber. It is to provide a vehicle emission control system to block the inflow.

1 is a configuration diagram showing an exhaust gas control system of a conventional vehicle;

2 is a block diagram showing an exhaust gas control system of a vehicle according to the present invention,

3 is a cross-sectional view showing an operating state of the negative pressure plate of the present invention,

Explanation of symbols on the main parts of the drawings

100: rocker cover 200: EGR valve

300: flap 400: negative pressure plate

500: intake hose

Exhaust gas control system of the present invention for achieving the above object is an intake hose provided so that one end of the rocker cover and the exhaust gas recirculation valve and the exhaust gas recirculation operation section between the exhaust gas recirculation valve and the intake hose In the exhaust gas control system of a vehicle provided with a flap that is open and closed by a predetermined actuator that is provided in the electronic control, the exhaust gas recirculation valve is opened and closed in accordance with the OPEN / CLOSE operation of the flap, the And a predetermined instantaneous negative pressure blocking means for temporarily blocking the intake of the exhaust gas in the rocker cover by the instantaneous negative pressure generated in the intake hose during the OPEN operation of the flap.

Hereinafter, with reference to the accompanying drawings will be described in detail the exhaust gas control system of the present invention.

Exhaust gas control system of the vehicle according to the present invention, see Figs. 2 and 3, the intake hose 500 and EGR valve 200 is provided so that one end of the rocker cover 100 and the EGR valve 200 is in communication with each other. And flap 300 that is opened and closed by a predetermined actuator that is provided in the EGR operating section between the intake hose 500 and the electronic control, and is generated in the intake hose 500 during the OPEN operation of the flap 300. The negative pressure plate 400 temporarily blocks the blow-by gas in the rocker cover 100 from being sucked into the intake pipe by the instantaneous negative pressure.

In more detail, the relationship between the EGR valve 200 and the flap 300 is the same as the conventional one when the flap 300 is open, the EGR valve 200 is closed and the exhaust gas does not flow into the intake pipe When the vacuum negative pressure is generated in the intake hose 500, blow-by gas in the rocker cover 100 flows into the intake pipe through the intake hose 500, and when the flap 300 is turned off, the EGR valve 200 is opened. Exhaust gas is introduced into the combustion chamber and the flow of blow-by gas in the rocker cover 100 is blocked.

Then, the negative pressure plate 400 is hinged to one end of the intake hose 500 to be rotatable by the suction force according to the instantaneous negative pressure in the intake hose 500 generated as the flap 300 is closed and opened momentarily. It has a structure.

Referring to the operation of the exhaust gas control system of the present invention having such a configuration as follows.

When the flap 300 is closed and opened momentarily during low-speed driving of the engine, a predetermined suction force is generated according to the instantaneous negative pressure generated in the intake hose 500, whereby the negative pressure plate 400 causes the intake hose 500. The hinge is moved to the side to close the inner diameter of the intake hose 500. As a result, the blow-by gas and the engine oil inside the rocker cover 100 are not sucked to the intake hose 500 and filled in the rocker cover 100.

Thereafter, when the engine is driven at a high speed and a normal vacuum negative pressure is generated in the intake hose 500, the negative pressure plate 400 is hinged downward by its own load to open the intake hose 500, and thus the intake hose 500 is opened. The blow-by gas in the rocker cover 100 is introduced into the intake hose 500 by the vacuum negative pressure generated therein.

On the other hand, when the flap 300 is closed, the vacuum negative pressure in the intake hose 500 is lost, the blow-by gas in the rocker cover 100 is not introduced, and the EGR valve 200 is opened to exhaust the exhaust system. Gas is introduced into the combustion chamber and the exhaust gas is recycled.

As described above, the exhaust gas control system of the inventive vehicle is configured to block the blow-by gas and engine oil in the rocker cover from entering the intake pipe of the engine according to the instantaneous negative pressure generation. By blocking the generation of smoke in accordance with the process has an effective effect, such as improving the output performance of the engine and the performance of the exhaust gas, preventing the consumption of engine oil.

Claims (2)

OPEN / CLOSE operation is performed by an intake hose provided to communicate one end of the rocker cover with the exhaust gas recirculation valve, and a predetermined actuator controlled by an electronically controlled exhaust gas recirculation operation section between the exhaust gas recirculation valve and the intake hose. In the exhaust gas control system of a vehicle having an openable flap to open and close the exhaust gas recirculation valve in accordance with the OPEN / CLOSE operation of the flap, And a predetermined instantaneous negative pressure blocking means for temporarily blocking the blow-by gas in the rocker cover from being sucked into the intake cylinder by the instantaneous negative pressure generated in the intake hose during the OPEN operation of the flap. Emission control system. According to claim 1, wherein the instantaneous negative pressure blocking means is hinged to the end of the intake hose and is rotated by the instantaneous negative pressure generated instantaneously during the on operation of the flap is provided with a negative pressure plate for temporarily blocking the intake hose Emission gas control system of an automobile.