KR20040003144A - The exhaust gas reducing method of the engine - Google Patents

Abstract

PURPOSE: A method is provided to reduce the amount of hydro-carbon and allow for a lean air-fuel ratio by effectively atomizing the fuel during the cold start of the vehicle. CONSTITUTION: A vehicle engine comprises a plurality of cylinders, a sampling pipe(60) for communicating combustion chambers(10) of cylinders and an intake port(20), and a sampling valve(30) for opening/shutting the sampling pipe. The exhaust gas generated during the ignition of each of cylinders is injected to the intake port of each of cylinders communicated through the sampling pipe, during the final stage of the exhaust stroke.

Description

How to reduce exhaust gas of automobile engines {THE EXHAUST GAS REDUCING METHOD OF THE ENGINE}

The present invention relates to a method for reducing exhaust gas emitted from an automobile engine, and more particularly, to a method for reducing exhaust gas of an automobile engine configured to reduce exhaust hydrocarbons generated during cold start using combustion gas in a cylinder.

In general, it is known that at least 80% of the exhaust hydrocarbons emitted when driving in the FTP-75 mode are emitted during cold start. This is because the fuel injected by the injector does not atomize by hitting the cold intake port, flows into the combustion chamber, and the conversion temperature is poor because the temperature of the catalyst is low.

In order to remedy this problem, an apparatus using an air-assisted injector or an electric heater, or injecting secondary air into the combustion chamber is considered.

However, the air-assisted injector has a good effect on atomization of the injected fuel, but the particles of the injected fuel have a problem of entering the combustion chamber after being hit by the intake port, and the electric heater takes a long time to heat up. In addition to the demand, there is a problem of durability, and the method of injecting secondary air into the combustion chamber is effective for atomization of the fuel, but there is a problem in that the durability of the cylinder or additional high pressure compressed air is required.

Accordingly, the present invention has been made to solve the above problems, by injecting a high temperature combustion gas discharged after the explosion stroke to the intake port of the cylinder in the intake stroke, so that the fuel injected by the injector is atomized It is an object of the present invention to provide a method for reducing exhaust gas of an automobile engine, which improves combustion characteristics during cold start of the engine.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view showing the stroke of the remaining cylinders when the first cylinder is a compression stroke in an engine having four cylinders for explaining the present invention.

2 is a view schematically showing an operating state of a sampling valve according to the present invention.

<Description of the Reference Code>

10-combustion chamber, 20-intake port,

30-sampling valve, 40-injector,

50-camshaft, 60-sampling pipe.

In order to achieve the above object, the present invention has a first cylinder, a third cylinder, and a fourth cylinder, each having four cylinders, a sampling pipe communicating each cylinder with each other, and a sampling valve for opening and closing the pipes. In an engine of a vehicle having an ignition sequence of a second cylinder, the exhaust gas generated during ignition of the first cylinder is injected into the intake port of the fourth cylinder through a sampling pipe opened by a sampling valve, and the third The exhaust gas generated when the cylinder is ignited is injected into the intake port of the second cylinder through the sampling pipe, and the exhaust gas generated when the ignition of the fourth cylinder is injected into the intake port of the first cylinder through the sampling pipe, The exhaust gas generated during ignition of the second cylinder is injected into the intake port of the third cylinder through the sampling pipe. And of providing an exhaust gas reduction method.

Hereinafter, the present invention will be described in detail with reference to the drawings.

In general, an engine of a four-cylinder vehicle performs intake, compression, explosion, and exhaust stroke for each cylinder. In addition, if necessary, the engine has an ignition order of the first cylinder cyl1, the third cylinder cyl3, the fourth cylinder cyl4, and the second cylinder cyl2 in accordance with the rotation of the cam shaft. Can be configured.

Here, referring to FIG. 1, four cylinders including a combustion chamber 10, an intake port 20, a sampling valve 30, an injector 40, and a sampling pipe 60 are illustrated. When (cyl1) is the compression stroke (see (a) of FIG. 1), the second cylinder (cyl2) is an explosion stroke (see (b) of FIG. 1), and the third cylinder (cyl3) is an intake stroke (see FIG. 1). (c)), the fourth cylinder cyl4 is configured to be positioned in the exhaust stroke (see (d) of FIG. 1), respectively.

On the other hand, each cylinder (cyl1, cyl2, cyl3, cyl4) is in communication with the intake port 20 of the different cylinder. That is, the combustion chambers 10 near the intake port 20 of the cylinders communicate with each other via the sampling pipe 60 through the intake ports 20 of the other cylinders (FIG. 1, the second cylinder cyl2 and the third cylinder). Only sampling pipe 60 between cylinders cyl3 is shown). For example, in an engine having an ignition sequence of a first cylinder cyl1, a third cylinder cyl3, a fourth cylinder cyl4, and a second cylinder cyl2, the combustion chamber 10 and the fourth cylinder of the first cylinder Sampling between the intake port 20 of the cylinder, the combustion chamber of the third cylinder and the second cylinder, the intake port of the fourth cylinder and the first cylinder, and the combustion chamber of the second cylinder and the intake port of the third cylinder The pipe 60 and the sampling pipe 30 which open and close this sampling pipe 60 are comprised.

Therefore, the high temperature exhaust gas generated in the combustion chamber 10 when the first cylinder cyl1 is ignited is transferred to the fourth cylinder cyl4 through the sampling pipe 60 opened by the sampling valve 30 during the exhaust stroke. And the exhaust gas generated when the third cylinder cyl3 is ignited are injected into the intake port 20 of the second cylinder cyl2 through the sampling pipe 60. The exhaust gas generated when the fourth cylinder cyl4 is ignited is injected into the intake port 20 of the first cylinder cyl1 through the sampling pipe 60, and the exhaust gas generated when the second cylinder cyl2 is ignited. Gas is injected into the intake port 20 of the third cylinder cyl3 through the sampling pipe 60. However, the exhaust gas generated in each explosion stroke of each cylinder flows into the intake port 20 of each cylinder associated with the sampling valve 3 being opened during the final exhaust stroke.

Therefore, in the cylinder of the intake stroke of the cylinder, the fuel injected by the injector 40 is injected into the combustion chamber 10 together with the hot exhaust gas flowing from the sampling pipe 60, so that atomization and evaporation of fuel is activated. This improves the combustion characteristics during cold start.

2 is a view illustrating in detail a sampling valve 30 installed in the combustion chamber 10 to open and close the sampling pipe 60, and as shown in FIG. When the valve pins 32 supported by the closing closing the inlet 33 toward the combustion chamber 10, the exhaust gas is not introduced. In addition, as shown in (b) of FIG. 2, when the camshaft 50 rotates to push the spring 31 during the end of the exhaust stroke, the valve pins 32 advance to open the inlet 33. The exhaust gas in the combustion chamber 10 is directed to the intake port 20 of the cylinder in the intake stroke through the gas passage 34 connected to the sampling pipe 60 through the inlet 33.

Here, the opening (sampling of the exhaust gas) of the sampling valve 30 according to the rotation of the camshaft 50 is to be opened at the ignition ATDC 70 ° CA ~ ATDC 110 ° CA, the combustion chamber 10 pressure 1.5 bar.

On the other hand, the term "sampling" of the present specification means to collect the high-temperature gas generated in the combustion chamber 10 of the cylinder during the explosive stroke and send it to the intake port (20).

As described above, according to the present invention, since the fuel is atomized efficiently during cold start of the vehicle, there is an effect of reducing the amount of exhaust hydrocarbon and making the air-fuel ratio lean.

Claims (3)

In an engine of an automobile provided with a plurality of cylinders, having a sampling pipe 60 for communicating the combustion chamber 10 and the intake port 20 of each cylinder with each other, and a sampling valve 30 for opening and closing the pipe 60, Exhaust gas generated during ignition of each cylinder is injected into the intake port (20) of each cylinder communicated through the sampling pipe (60) during the end of the exhaust stroke, the exhaust gas reduction method of the automobile engine. 2. The method of claim 1, wherein the cylinder into which the exhaust gas flows through the sampling pipe (60) as the opening of the sampling valve (30) is in the intake stroke. 2. The cylinder according to claim 1, wherein the cylinder includes four cylinders, and the ignition sequence of the first cylinder cyl1, the third cylinder cyl3, the fourth cylinder cyl4, and the second cylinder cyl2 is determined. In addition, the combustion chamber 10 of the second cylinder and the intake port 20 of the third cylinder, the combustion chamber of the third cylinder and the intake port 20 of the second cylinder, the combustion chamber of the fourth cylinder and the intake port of the first cylinder And a sampling pipe 60 for communicating between the combustion chamber of the first cylinder and the intake port of the fourth cylinder, and a sampling valve 30 for opening and closing the pipe 60. Way. .