KR19990051673A - Vehicle Exhaust Gas Purifier - Google Patents

Abstract

The present invention is to install a catalytic converter in the exhaust manifold to reduce the emission of harmful gases during cold start, the front of the catalytic converter by installing a simple structure of the bleed feeder to supply secondary air to purify the exhaust gas to promote oxidation Apparatus, the exhaust gas purifying apparatus is attached to the exhaust gas manifold 40, the catalytic converter 42 to remove the harmful substances in the exhaust gas, and the exhaust manifold 40 is attached to the outside air catalytic converter It has a structure including a secondary air supply to 42.

Description

Vehicle Exhaust Gas Purifier

The present invention relates to a vehicle exhaust gas purification apparatus, and more particularly, by installing a catalytic converter in the exhaust manifold to reduce the emission of harmful gases during cold start, and in the front of the catalytic converter by installing a secondary air supply of a simple structure to oxidize It relates to a vehicle exhaust gas purification device capable of supplying secondary air to promote the action.

In general, when the exhaust gas of a vehicle is classified according to the emission source, the exhaust gas of the fuel and air mixture is combusted in a cylinder and then released into the atmosphere through an exhaust pipe, and the evaporation gas and piston from which gasoline in the fuel tank is evaporated. The gap between the cylinder wall and the cylinder can be divided into a blow-by gas in which the combustion chamber's mixer or unburned gas flows into the crankcase.

Among them, the exhaust gas discharged from the engine through the exhaust manifold contains a large number of harmful gases, and in order to prevent environmental pollution, these harmful gases are treated by a catalytic converter before being released into the atmosphere and are harmless. Should be converted to and released.

1 is a configuration diagram showing an exhaust system of a typical vehicle. An intake manifold 4 is provided at one side of the engine 2 to supply external air, and at the other end of the intake manifold 4, combustion gas combusted from the cylinder is discharged as the exhaust valve is opened. The manifold 6 is attached. The exhaust gas discharged from the exhaust manifold 6 flows into the catalytic converter 20 through the front exhaust pipe 10. The catalytic converter 20 removes harmful substances contained in the exhaust gas by the redox reaction, and the exhaust gas passing through the catalytic converter 20 passes through the silencer to reduce the exhaust sound, and then the rear exhaust pipe 16. Is discharged to outside.

The front end of the catalytic converter 20 is coupled to the front exhaust pipe 10 via the gasket 12, and the rear end is coupled to the rear exhaust pipe 16 via the gasket 14.

In the conventional vehicle exhaust gas purification device having such a configuration, in order for the catalytic converter to function properly, the temperature of the exhaust gas must be a temperature (about 250 to 350 ° C.) at which the purification efficiency of the catalyst is 50% or more. Therefore, during the cold start before this temperature, the purification efficiency of the catalyst is lowered, and there is a problem of polluting the environment by releasing a large amount of harmful gases such as HC, CO, and NOx.

An object of the present invention devised to solve this problem is to increase the temperature of the exhaust gas to shorten the normal operating time of the catalyst and to suppress the emission of harmful gas at the time of cold start to the maximum, and to install a secondary air supply of a simple structure The purpose of the present invention is to provide an exhaust gas purification device for a vehicle in which the exhaust gas recirculation (EGR) valve is installed in the exhaust manifold to reduce the number of parts and simplify the structure.

1 is a block diagram showing a conventional vehicle exhaust gas purification device

Figure 2 is a block diagram showing a vehicle exhaust gas purification apparatus according to the present invention

♣ Explanation of symbols for main part of drawing ♣

22: cylinder block 28: piston

30: intake manifold 32: surge tank

34: exhaust pipe 36: temperature sensor

38: EGR valve 40: exhaust manifold

42: catalyst converter 44: case

48: cover 48: inlet hole

50: filter 52: complete

54: lead valve 56: stopper

58: oxygen sensor 60: return pipe

In the above-described object of the present invention, in a vehicle engine in which air introduced through an intake manifold in which external air is introduced through a surge tank is mixed with a mixer and then compressed by a piston, burned and discharged through an exhaust manifold, A catalytic converter, which is embedded in the exhaust manifold and removes harmful substances in the exhaust gas, is attached to the exhaust manifold, and has a secondary air supply for supplying external air to the catalytic converter. Is achieved.

Hereinafter, a vehicle exhaust gas purifying apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 2 is a block diagram showing a vehicle exhaust gas purification apparatus according to the present invention. First, when the configuration of the engine is roughly shown, the cylinder block 22 in which the piston 28 slides along the inner wall and the water jacket 24 through which the coolant flows are formed integrally with the cylinder block 22. ), The intake and exhaust valves including the injection valve, the cylinder head provided with the valve driving mechanism for driving these valves, the intake manifold 30 through which the outside air flows through the surge tank 32, And an exhaust manifold 40 in which air introduced through the intake manifold 30 is mixed with the mixer and then lifted by the connecting rod 26 and compressed by the piston 28 to discharge the burned gas. have. Gas exiting the exhaust manifold 40 is directed to the muffler through the exhaust pipe 34.

In the vehicle engine of such a configuration, in a preferred embodiment of the present invention, in order to suppress the emission of harmful gases during cold start, the exhaust manifold 40 removes harmful substances contained in the exhaust gas by oxidation and reduction. A catalytic converter 42 was installed. A secondary air supply was attached to one side of the exhaust manifold 40 to supply external air to the catalytic converter 42 to promote oxidation of the catalyst.

By forming the exhaust manifold 40 in the shape of a roughly rectangular shape and then providing the catalytic converter 42 therein, the exhaust gas can be further heated by the radiant heat on the catalyst side, so that the temperature of the exhaust gas can be increased in a short time.

Here, in the overall configuration of the secondary air supply, the case 44 is fixed to the exhaust manifold 40 by bolts 46, and the cover 44 having the inlet hole 48a is attached to one end thereof. And a filter 50 for removing dust or foreign matter contained in the air introduced through the inlet hole 48a and the air passing through the filter 50 through the catalytic converter 42. The complete 52 having the supply hole 52a to be sent to the chamber, the reed valve 56 opening and closing the supply hole 52a formed in the complete 52, and the opening limit of the reed valve 56 at a constant level. The stopper 54 is made of paper. The stopper 54 serves to prevent damage to the reed valve 56 in addition to regulating the opening limit of the reed valve 56.

By supplying the surplus oxygen to the catalytic converter through the secondary air supply of this configuration it is possible to accelerate the oxidation of the catalyst. Here, the complete 52 is formed by bonding a rubber sheet to the aluminum body, and a plurality of supply holes 52a are formed to supply air that has passed through the filter 50 to the catalytic converter 42. The reed valve 56 enables external air to flow through the supply hole 52a, while preventing the air in the exhaust manifold 40 from being discharged to the outside through the filter 50. .

In addition, the exhaust manifold 40 according to the preferred embodiment of the present invention is provided with an EGR valve 38 for sending a part of the exhaust gas to the intake manifold through the return line 60. The internal diaphragm is operated by the negative pressure of the engine supplied by opening and closing of the thermovalve 36 installed in the water jacket 24 of the cylinder block 22, and the EGR valve 38 operates the exhaust manifold 40. Part of the exhaust gas discharged through the return line 60 serves to supply the intake manifold 30 through. The exhaust manifold 40 is equipped with an oxygen sensor 48 that detects the amount of oxygen contained in the exhaust gas and sends it to the engine control unit.

Thus, by mounting the catalytic converter 42 in the exhaust manifold 40, since the temperature of exhaust gas is heated and supplied to the catalytic converter 42 by the radiant heat of a catalyst side, the normal operation time of a catalyst at the time of cold start is shortened. The discharge of harmful gas can be suppressed as much as possible, and by supplying the outside air to the catalytic converter 42 by the secondary air supply, it promotes the oxidation of the catalyst and thus harmful substances such as HC, CO, NOx in all rotational regions of the engine. The material can be removed.

According to the present invention described above, since the catalytic converter is installed in the exhaust manifold, the temperature of the exhaust gas flowing into the catalyst is high, so that the normal operating time of the catalyst is shortened. In addition, the secondary air supply having a simple structure may be installed in the exhaust manifold to promote oxidation of the catalyst, and the EGR valve may be installed in the exhaust manifold to reduce the number of parts and simplify the structure.

Claims (3)

The air introduced through the intake manifold 30 into which the outside air flows through the surge tank 32 is mixed with the mixer, and then compressed by the piston 28 to be combusted and discharged through the exhaust manifold 40. In a vehicle engine, A catalytic converter 42 embedded in the exhaust manifold 40 to remove harmful substances in the exhaust gas; And a secondary air supply unit attached to the exhaust manifold, for supplying external air to the catalytic converter 42. The method of claim 1, The secondary air supply unit is fixed to the exhaust manifold 40 by a bolt 46, and a case 44 having a cover 58 having an inlet hole 48a attached thereto at one end thereof; A filter 50 installed in the case 44 to remove dust or foreign matter contained in air introduced through the inlet hole 48a; A complete 52 having a supply hole 52a for sending air passing through the filter 50 to the catalytic converter 42, A reed valve 56 for opening and closing the supply hole 52a of the complete 52; Vehicle exhaust gas purification device, characterized in that consisting of a stopper (54) to constantly restrain the opening limit of the reed valve (56). The method of claim 1, The exhaust manifold 40 is provided with an EGR valve 38 for sending a part of the exhaust gas to the intake manifold through a return line 60.