KR0124046Y1 - Combustion heating apparatus for exhaust gas - Google Patents

Abstract

By injecting and supplying fuel to the exhaust gas, the catalyst is activated and contained in the exhaust gas by increasing the reaction temperature of the catalyst in a short time during the cold operation of an engine having a cooling water temperature of 65 ° C. or less, which emits the most harmful components due to the combustion heat following combustion. Intake / exhaust system of an engine in which a combustion chamber of a cylinder and an exhaust manifold containing a catalyst are installed so that the exhaust gas can be discharged to provide an exhaust gas combustion heating device for reducing the emission of harmful substances. A second injector installed in said exhaust manifold to be controlled by an electrically connected ECU; It is provided in the connecting pipe between the second injector and the fuel pipe to be a fuel pressure regulator for adjusting the fuel pressure in accordance with the pressure state of the surge tank.

Description

Exhaust Gas Combustion Heater of Engine

1 is a view showing the exhaust gas combustion heating apparatus of the engine according to the present invention.

2 is a side view showing an exhaust gas recirculation apparatus of a conventional engine.

* Explanation of symbols for main parts of the drawings

4: cylinder head 8: intake manifold

10 air cleaner 12 throttle valve

14: surge tank 16: injector

18: exhaust manifold 20: catalyst

22: ECU 24: second injector

26: connection pipe 27: fuel pressure regulator

28: air port 30: negative pressure chamber

32: hydraulic chamber 34: housing

36: fuel inlet port 38: fuel outlet port

40: fuel return port 42: diaphragm

44: return spring

[Industrial use]

The present invention relates to an exhaust gas combustion heating apparatus of an engine, and more particularly, by supplying fuel injected by injection to exhaust gas to increase the reaction temperature of the catalyst in a short time by post combustion heat, thereby activating the reaction of the catalyst to exhaust gas. The present invention relates to an exhaust gas combustion heating apparatus of an engine for reducing the emission of harmful components contained in the engine.

[Private Technology]

In general, an engine that provides driving power to an automobile includes an intake device that provides a mixer and an exhaust device through which the burned combustion gas is discharged. Since the exhaust gas emitted from the exhaust device contains harmful components, the combustion chamber of the engine The exhaust gas combusted by the combustion is burned and heated to re-burn the harmful gas such as nitrogen, thereby reducing the harmful gas.

As described above, the recombustion of the exhaust gas is applied to the intake apparatus as shown in FIG. 2. The intake apparatus of the cylinder head 102 is formed in communication with the combustion chamber so that the air for forming the mixer can be sucked. An intake manifold 106 fitted with a gasket is provided at the intake port 104.

In addition, the air intake manifold 106 is provided with an air cleaner 108 to filter the intake air, and the air filtered through the air cleaner 108 is drawn by the valve 110. After the suction amount is adjusted, the suction tank 112 passes through the surge tank 112 so as to be sucked into the combustion chamber of the cylinder.

On the other hand, the outer lower portion of the intake manifold 106 of the portion located between the throttle valve 110 and the combustion chamber of the cylinder 114 to form a jacket 114 through which the coolant flows and to the jacket 116 The thermo valve 118 which opens and closes according to the temperature of cooling water is attached.

As described above, the thermovalve 118 includes a first valve in which the valve rod 122 reciprocates according to the temperature of the coolant to allow a valve fixed to the valve rod 120 to pass through the valve housing 122. The port 124 is opened and closed.

The first port 124 of the thermo valve 118 is in communication with the second port 126 communicating with the intake manifold 106 in front of the throttle valve 110 by the atmospheric pressure line 128, The third port 130 in communication with the intake manifold 106 in the portion where the throttle valve 110 is located is formed of the fourth port 132 and the vacuum line pierced in the valve housing 122 of the thermo valve 118. 134).

On the other hand, the valve rod 120 of the thermo-valve 118 is to perform the flow up and down by a heat-sensitive means such as bimetal operating in accordance with the temperature of the cooling to 65 ° reference, The valve rod 120 has an EGR valve (Exhaust Gas Recirculation valve) 138 that operates in accordance with the intermittent state of atmospheric pressure air entering and exiting the atmospheric pressure port 136.

The EGR valve 138 is connected to the intake manifold 106 near the intake port 104 and the exhaust manifold 142 near the exhaust port 140, respectively. The exhaust gas passage 146 has an intermittent chamber 148 in communication with each other.

In such an intermittent chamber 148, there is a check valve 150 for intermitting the first exhaust gas passage 144 and the second exhaust gas passage 146 to allow the check valve 150 to intervene. The opening and closing operation is performed in accordance with the expansion and contraction of the diaphragm 154 of the negative pressure chamber 152 isolated at 148 to control the flow of the exhaust gas passing through the first and second exhaust gas passages 144 and 146.

In addition, the diaphragm 154 of the negative pressure chamber 152 allows the upper surface to be supported by the spring 156 to block the first exhaust gas passage 144 together with the check valve 150, or the negative pressure chamber ( 152 is in communication with the vacuum line 134 by a connecting line to open the first exhaust gas passage 144 by the vacuum force applied to the vacuum line 134 by the throttle valve 110. .

In this configuration, when the temperature of the coolant circulating in the jacket 116 is 65 ° or less, the valve of the thermovalve 118 opens the first port 124 so that the first port 124 opens the atmospheric pressure line 128. By allowing the second port 126 to communicate with each other, the atmospheric pressure is transferred to the vacuum line 134 through the fourth port 132 communicating with the first port 124 in the valve housing 122 of the thermovalve 118. To get crazy.

Accordingly, since the vacuum force generated from the third port 130 is not applied to the negative pressure chamber 152 of the EGR valve 138 connected to the vacuum line 134 by the connection line, the diaphragm 154 of the EGR valve 138 may not be applied. The valve 150 is pushed by the elasticity of the spring 156 to block the first exhaust gas passage 144-and the second exhaust gas passage 146 of the exhaust manifold to discharge the exhaust manifold 142. Is not recycled to the intake port 104 of the intake manifold 106.

In addition, when the temperature of the coolant circulating in the jacket 116 is 65 ° or more, the valve of the thermo valve 118 closes the first port 124 so that the first port 124 is blocked from the second port 126. By doing so, the atmospheric pressure through the fourth port 132 which is blocked from the first port 124 in the valve housing 122 of the thermo valve 118 does not reach the vacuum line 134.

Accordingly, the vacuum force generated from the third port 130 is applied to the negative pressure chamber 152 of the EGR valve 138 connected to the vacuum line 134 by the connection line, and the EGR valve 138 is operated by the vacuum force. The diaphragm 154 and the check valve 150 are raised to communicate with the first exhaust gas passage 144 and the second exhaust gas passage 146 of the exhaust manifold 142 and discharge to the exhaust manifold 142. Since the exhaust gas is recycled to the intake port 104 of the intake manifold 106, it is possible to reduce the emission of harmful components by reburning the exhaust gas.

[Problem trying to solve]

However, the conventional exhaust gas recirculation apparatus as described above recycles exhaust gases containing harmful components to the intake manifold so that they can be reburned with the newly supplied fuel, thereby reducing the harmful components contained in the exhaust gas to some extent. When the cold operation of the engine having a coolant temperature of 65 ° C. or lower does not regenerate exhaust gas, there is a disadvantage in that the problem that most harmful components are discharged during cold operation of the engine is not solved.

The present invention was devised to solve the above-mentioned disadvantages, and an object of the present invention is an engine having a cooling water temperature of 65 ° C. or less at which the most harmful components are discharged by the heat of combustion according to post combustion by injecting and supplying fuel to exhaust gas. In the cold operation of the catalyst by increasing the reaction temperature of the catalyst in a short time, it is to provide an exhaust gas combustion heating apparatus of the engine to activate the catalyst to reduce the emission of harmful components contained in the exhaust gas.

[Means to solve the problem]

In order to realize this, the present invention installs an air cleaner to filter the intake air to the intake manifold installed by placing a gasket on the intake port of the cylinder head which is in communication with the combustion chamber so that the air for forming the mixer can be sucked. And installing an injector for injecting fuel from a fuel pump in the intake manifold such that the air sucked through the air cleaner is filtered by the throttle valve and then sucked through the surge tank to the combustion chamber of the cylinder. And an engine in which a combustion chamber of the cylinder and an exhaust manifold containing a catalyst are installed in communication with each other so that the combusted exhaust gas can be discharged. In the exhaust system, a fuel in accordance with the pressure state of the surge tank is provided in a second injector installed in the exhaust manifold and a connection pipe between the second injector and the fuel pipe so as to be controlled by an electrically connected ECU. An exhaust gas combustion heating apparatus for an engine, characterized in that the fuel pressure regulator is adjusted.

The fuel pressure regulator includes a negative pressure chamber in communication with the air port of the surge tank, a fuel inflow port in communication with the flexible pipe and a fuel outlet port in communication with the second injector, and an excessive fuel pressure. The fuel return port to be returned to is characterized in that consisting of the hydraulic chamber formed in communication.

The negative pressure chamber and the hydraulic chamber are characterized by being separated by a diaphragm carried by the return spring.

The fuel return port is characterized in that the end is intruded in the hydraulic chamber of the housing to the lower end of the diaphragm so as to be opened and closed by the diaphragm flows up and down according to the elasticity of the return spring and the pneumatic pressure of the surge tank.

[Action]

With this configuration, the fuel pressure regulator at the cold start of the engine is closed by the diaphragm pushed by the elasticity of the return spring, and the fuel return port communicating with the fuel tank is closed, and the fuel is supplied through the fuel inlet port supplied to the hydraulic chamber. Is supplied to the fuel outlet port and supplied to the second injector so that the second injector can inject fuel under the control of the ECU.

Therefore, the fuel injected and burned by the exhaust gas maintaining a constant temperature causes the heat of combustion to increase the reaction temperature of the catalyst in a short time, thereby activating the reaction of the catalyst, thereby reducing the emission of harmful components contained in the exhaust gas. do.

On the other hand, the fuel pressure regulator increases the temperature of the exhaust gas as the engine continues to be driven, and when the negative pressure is applied to the surge tank, the diaphragm overcomes the elasticity of the return spring by the negative pressure, and lifts the fuel return port upwards. The fuel filled in the hydraulic chamber is returned to the fuel tank through the fuel return port.

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

EXAMPLE

FIG. 1 is a view showing an exhaust gas combustion heating apparatus of an engine according to the present invention, in which air for forming a mixer is sucked in, and an intake apparatus for injecting fuel supplied through a flexible pipe pipe 2 is injected.

The intake apparatus described above is an air purifier that filters air to an intake manifold 8 installed by attaching a gasket to a cylinder head 4 formed in communication with a combustion chamber so that air for forming a mixer is sucked and mixed with fuel ( 10)

In addition, the intake manifold (8) has a throttle valve (12) for adjusting the intake amount of the air is filtered through the air purifier 10, the air passes through the surge tank (14) An injector 16 is connected to a fuel tank (not shown) and a fuel pipe 2 to inject fuel so as to form a mixer after being sucked into the combustion chamber of the cylinder.

On the other hand, as described above, the fuel mixed with air and formed into a mixer may be combusted in the combustion chamber to provide power for driving the engine, and then the exhaust gas may be discharged by an exhaust device formed in communication with the combustion chamber of the cylinder. To make it work.

The exhaust device is provided with an exhaust manifold 18 coupled to the cylinder head 4 so as to communicate with the combustion chamber, and the exhaust manifold 18 includes a catalyst 20 for purifying harmful components contained in the exhaust gas. To be installed.

On the other hand, the exhaust manifold 18 as described above is provided with a second injector 24 electrically connected to and controlled by the ECU 22, the second injector 24 is connected by the connecting pipe 26 It is connected to the duct pipe 2 so that the fuel pumped from the fuel pump can be supplied.

In addition, in the connecting pipe 26 between the second injector 24 and the fuel pipe 2, a fuel for adjusting the pressure of the fuel supplied to the second injector 24 according to the pressure state of the surge tank 14. The pressure regulator 27 is opened, and the fuel pressure regulator 27 has a negative pressure chamber 30 in communication with the air port 28 of the surge tank 14 and a hydraulic chamber in communication with the fuel pipe 2. The housing 34 which forms the 32 is provided.

In the housing 34 in which the hydraulic chamber 32 is formed, fuel is returned to the fuel tank according to the fuel inflow port 36 and the fuel outlet port 38 in communication with the second injector 24, and the excessive fuel pressure. The fuel return port 40 is configured to communicate with each other.

In addition, the negative pressure chamber 30 and the hydraulic chamber 32 are separated and formed by the diaphragm 42 carried by the return spring, and the fuel return port 40 has the elasticity and surge of the return spring 44. The end is formed in the hydraulic chamber 32 of the housing 34 in the lower center of the diaphragm 42 so as to be opened and closed by the diaphragm 42 which flows up and down according to the pneumatic pressure of the tank 14.

Exhaust gas combustion heating apparatus of the engine according to the present invention configured as described above is fuel communication with the fuel tank by the diaphragm 42 is pushed by the elasticity of the return spring 44, the fuel pressure regulator 27 at the cold start of the engine The return port 40 is closed.

Therefore, the fuel through the fuel inlet port 36 supplied to the hydraulic chamber 32 can be discharged to the fuel outlet port 38 to be supplied to the second injector 24 to control the above-mentioned agent under the control of the ECU 22. 2 The injector 24 is capable of injecting fuel, and the fuel injected by the exhaust gas maintaining a constant temperature causes the combustion heat to increase the reaction temperature of the catalyst 20 in a short time to react the catalyst 20. By activating this, it is possible to reduce the emission of harmful components contained in the exhaust gas.

On the other hand, the fuel pressure regulator 27 is the temperature of the exhaust gas is increased as the engine is continuously driven, and when the negative pressure is applied to the surge tank 14, the diaphragm 42 is the elasticity of the return spring 44 by this negative pressure. The fuel filled in the chamber 32 is returned to the fuel tank through the fuel return port 40 and is supplied to the second injector 24 because the fuel return port 40 is opened to be lifted upwards. To adjust.

[Effect of design]

The exhaust gas combustion heating apparatus of the engine according to the present invention as described above reacts with the catalyst during cold operation of the engine having a coolant temperature of 65 ° C. or lower, in which most harmful components are discharged by the combustion heat according to the post combustion by supplying fuel to the exhaust gas. By increasing the temperature in a short time, there is an advantage to reduce the emission of harmful components contained in the exhaust gas by activating the catalyst.

Claims (4)

Install an air purifier (10) to filter the intake air to the intake manifold (8) installed on the cylinder head (4) formed in communication with the combustion chamber so that the air for forming the mixer can be sucked, The air sucked through the air purifier 10 is filtered into the intake manifold 8 such that the suction amount is adjusted by the throttle valve 12 and then passed through the surge 14 tank to the combustion chamber of the cylinder. An injector 16 for injecting fuel from the pump is provided, and the engine is provided with a combustion chamber of the cylinder and an exhaust manifold 18 having the catalyst 20 so as to discharge the exhaust gas. An intake / exhaust device, comprising: a second injector (24) installed in the exhaust manifold (18) so as to be controlled by an electrically connected ECU (22); It is characterized in that it consists of a fuel pressure regulator 27 which is opened in the connecting pipe 26 between the second injector 24 and the fuel pipe 2 and adjusts the fuel pressure according to the pressure state of the surge tank 14. The exhaust gas combustion heating apparatus of the engine. The fuel pressure regulator (27) according to claim 1, further comprising: a negative pressure chamber (30) in communication with the air port (28) of the surge tank (14) in its housing (34); A fuel inlet port 36 in communication with the duct table 2, a fuel outlet port 38 in communication with the second injector 24, and a fuel return port for allowing fuel to be returned to the fuel tank according to the excessive fuel pressure; Exhaust gas combustion heating apparatus of the engine, characterized in that 40 is formed in communication with the hydraulic chamber (32). The exhaust gas combustion heating apparatus according to claim 2, wherein the negative pressure chamber (30) and the hydraulic chamber (32) are separated and formed by a diaphragm (42) carried by the return spring (44). The end of the diaphragm 42 according to claim 2, wherein the fuel return port 40 is opened and closed by the diaphragm 42 which is vertically flown according to the elasticity of the return spring 44 and the pneumatic pressure of the surge tank 14. The exhaust gas combustion heating apparatus of the engine, characterized in that the indentation is formed in the hydraulic chamber (32) of the housing (34) to the lower center.