KR20170103090A - Exhaust Gas Recirculation for vehicle - Google Patents

Exhaust Gas Recirculation for vehicle Download PDF

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Publication number
KR20170103090A
KR20170103090A KR1020160025402A KR20160025402A KR20170103090A KR 20170103090 A KR20170103090 A KR 20170103090A KR 1020160025402 A KR1020160025402 A KR 1020160025402A KR 20160025402 A KR20160025402 A KR 20160025402A KR 20170103090 A KR20170103090 A KR 20170103090A
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KR
South Korea
Prior art keywords
egr
exhaust gas
combustion chamber
engine
gas passage
Prior art date
Application number
KR1020160025402A
Other languages
Korean (ko)
Inventor
문승동
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020160025402A priority Critical patent/KR20170103090A/en
Publication of KR20170103090A publication Critical patent/KR20170103090A/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/41—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/52—Systems for actuating EGR valves
    • Y02T10/121—

Abstract

The present invention relates to a vehicle exhaust gas recirculation (EGR) system. The purpose of the present invention is to provide an improved vehicle EGR system realizing an effect of a cooled EGR system by having a configuration capable of cooling recirculated exhaust gas and supplying the same to an intake side without using an EGR cooler. To achieve the above purpose, the vehicle EGR system comprises: an EGR pipe for recirculating exhaust gas discharged from a combustion chamber of an engine; an EGR actuator or EGR valve for controlling recirculation amount of the exhaust gas recirculated through the EGR pipe; and an EGR gas passage portion formed to be connected to an intake port of the combustion chamber by passing through a water jacket for circulating engine coolant on the inside of a cylinder head of an engine. While the recirculated exhaust gas that has passed through the EGR actuator or the EGR valve passes through the EGR gas passage portion, the recirculated exhaust gas is cooled by the coolant in the water jacket and supplied to the combustion chamber through the intake port.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation system,

The present invention relates to an exhaust gas recirculation system for an automobile, and more particularly, to an exhaust gas recirculation system for an exhaust gas recirculation system of an automobile, and more particularly, to a system for recirculating exhaust gas from an exhaust gas recirculation system of a cold exhaust gas recirculation system The present invention relates to an improved exhaust gas recirculation system for an automobile which can exhibit the effect of the present invention.

BACKGROUND ART [0002] Various technologies for reducing harmful substances in exhaust gas have been developed in accordance with exhaust gas emission regulations of an automobile. One of them is a method of recycling a part of exhaust gas to an intake side of an engine to remove nitrogen oxides (NOx) An exhaust gas recirculation system is known.

The exhaust gas recirculation (EGR) system reduces the generation of harmful substances such as nitrogen oxides by supplying a part of the exhaust gas discharged from the combustion chamber of the engine to the intake manifold through the EGR valve to the combustion chamber.

Such an exhaust gas recirculation system includes a hot exhaust gas recirculation system (Hot EGR System) for reducing particulate matter (PM, particulate matter) and hydrocarbon (HC) as well as nitrogen oxides by retarding ignition and reducing the air- And a cold exhaust gas recirculation system (Cooled EGR system) for cooling the exhaust gas to lower the temperature in the combustion chamber to prevent combustion.

Among them, the hot exhaust gas recirculation system does not apply the EGR cooler, so the cost can be reduced. However, due to the temperature of the high recirculation exhaust gas (EGR gas), it is difficult to develop the exhaust gas recirculation system in various aspects such as air- And there is a disadvantage compared to a cold exhaust gas recirculation system in which nitrogen oxides are reduced by lowering the combustion temperature in terms of reduction of harmful substances such as nitrogen oxides.

1 is a schematic view showing a configuration of a cold exhaust gas recirculation system in which a part of the exhaust gas discharged from the exhaust side of the engine 1 is cooled through the EGR cooler 2 and thereafter the EGR actuator 3 or the EGR valve To the intake side.

As described above, the cold exhaust gas recirculation system is disadvantageous in terms of cost because it has an expensive EGR cooler for cooling the recirculated exhaust gas.

Since the EGR cooler is always exposed to the exhaust gas at a high temperature, it is necessary to secure the excellent thermal stability and the durability, so that the production cost is high and it is disadvantageous in terms of vehicle weight.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cooling exhaust gas recirculation system that can cool a recirculated exhaust gas without using an EGR cooler, And an exhaust gas recirculation system of an improved automobile capable of exhibiting an effect.

In order to achieve the above object, according to the present invention, there is provided an exhaust gas recirculation system comprising: an EGR pipe for recirculating an exhaust gas discharged from a combustion chamber of an engine; An EGR actuator or an EGR valve for controlling an amount of recirculated exhaust gas recirculated through the EGR pipe; And an EGR gas passage portion formed in the cylinder head of the engine so as to be connected to an intake port of the combustion chamber through a water jacket for circulating engine cooling water, wherein a recirculation exhaust gas passing through the EGR actuator or the EGR valve passes through the EGR gas passage portion The cooling water is cooled by the cooling water in the water jacket and then supplied to the combustion chamber through the intake port.

As a result, according to the exhaust gas recirculation system of the present invention, EGR gas supplied for exhaust gas reduction can be cooled by the engine cooling water in the water jacket while passing through the EGR gas passage portion, The temperature of the supplied EGR gas can be lowered.

Therefore, it is possible to expect the harmful material reduction performance at the level of the cooled EGR system without the conventional EGR cooler for lowering the temperature of the EGR gas, and it is possible to obtain the effect such as cost reduction and weight reduction by eliminating the EGR cooler .

1 is a schematic view showing a configuration of a cold exhaust gas recirculation system.
2 is a view showing a configuration of an exhaust gas recirculation system according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a state in which an EGR gas passage portion is formed inside a cylinder head in an exhaust gas recirculation system according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains.

FIG. 2 is a view showing a configuration of an exhaust gas recirculation system according to an embodiment of the present invention. FIG. 2 illustrates an example of a turbocharger engine in which intake air is supercharged using a turbocharger 131.

2, the exhaust gas is discharged from the combustion chamber of the engine 110 to the exhaust pipe 121 through the exhaust port 114 of the cylinder head 112 and the exhaust manifold 115 communicated therewith, The exhaust gas discharged to the exhaust pipe 121 passes through the turbocharger 131 to rotate the turbine 132 of the turbocharger.

The compressor 133 of the turbocharger 131 connected to the turbine 132 is rotated and the compressor 133 sucks the air through the air cleaner not shown and compresses the compressed air, To the intake side.

At this time, the air compressed by the compressor 133 is cooled while passing through the intercooler 141, and then supplied to the combustion chamber through the intake manifold 111 of the engine 110 and each intake port 113.

Part of the exhaust gas discharged from the combustion chamber of the engine 110 through the exhaust port 114 and the exhaust manifold 115 flows through the EGR pipe 122 and the EGR actuator 123 (or the EGR valve) 110 to the intake side of the exhaust gas recirculation system.

The EGR actuator 123 regulates the flow rate of the recirculated exhaust gas (hereinafter, referred to as 'EGR gas'). The EGR actuator 123 may be installed in the EGR pipe 122 connected to the exhaust manifold 115, To the EGR pipe 122 branched from the exhaust pipe 121 connected to the EGR pipe 122.

The inlet of the EGR actuator 123 is connected to the EGR pipe 122 through which a part of the exhaust gas flows and the outlet of the EGR actuator 123 is connected to the EGR And is connected to the gas passage portion 117.

The EGR actuator 123 may be a known electronic EGR actuator capable of opening and closing the opening and closing amount of the internal passage by driving the valve means according to a control signal of a control unit (not shown) .

3 is a cross-sectional view showing a state in which an EGR gas passage portion 117 is formed in a cylinder head 112 in an exhaust gas recirculation system according to an embodiment of the present invention.

The individual EGR gas passage portions 117 for supplying the EGR gas to the respective cylinders (combustion chambers and cylinders) are connected to a water jacket (not shown) in the cylinder head 112 110).

The EGR gas passage portion 117 is formed in the cylinder head 112 of the engine 110 together with the intake and exhaust ports 113 and 114 and the water jacket 110 and passes through the inner space of the water jacket And the pipe-shaped surface is brought into contact with the cooling water filled in the inner space of the water jacket 110. In this case,

One end of the EGR gas passage 117 is connected to one corresponding branch pipe 124 branched by the number of cylinders (combustion chambers, cylinders).

The other end portion of the EGR gas passage portion 117 (which is a gas outlet portion) is formed in the cylinder head 112 and connected to each combustion chamber of the engine 110 (a combustion chamber in which the cylinder block and the cylinder head are formed) And is connected to an intake port 113 for supplying intake air to the combustion chamber.

The branch pipe 124 has a structure in which one pipe connected to the outlet of the EGR actuator 123 is branched into several pipes and is discharged from the exhaust manifold 115 of the engine 110 and supplied to the EGR pipe 122 And the EGR actuator 123 are distributed to the respective branch pipes 124 and then pass through the respective EGR gas passage portions 117 in the cylinder head 112. [

Since each EGR gas passage portion 117 is provided so as to pass through the inner space of the water jacket 110 in the cylinder head 112, the EGR gas flowing through each EGR gas passage portion 117 flows into the engine The EGR gas is cooled by the cooling water circulated through the water jacket 110 of the intake port 113 and the EGR gas is supplied to each combustion chamber together with the intake air introduced into the intake port 113.

As a result, the exhaust gas recirculation system of the present invention can lower the temperature of the EGR gas supplied to the combustion chamber of the engine 110 in order to reduce exhaust gas harmful substances without using a separate EGR cooler, ). ≪ / RTI >

The EGR gas passage portion 117 may be formed by molding a cylinder head material together with the intake port 113, the exhaust port 114 and the water jacket 110 at the time of molding the cylinder head 112, At this time, the internal flow path or the like of the EGR gas passage portion 117 may be formed through further processing.

At this time, the EGR gas passage portion 117 connected to the intake port 113 so as to allow the EGR gas to flow from the exhaust side is separately formed for each cylinder (combustion chamber, cylinder) in the cylinder head 112 And six EGR gas passage portions in the case of a six-cylinder engine).

Thus, the exhaust gas recirculation system according to the present invention does not have a separate EGR cooler, but has an EGR gas passage portion 117 formed to pass through the water jacket 110 inside the cylinder head 112 And the EGR gas discharged from the combustion chamber of the engine 110 can be supplied to the intake port 113 of each combustion chamber through the EGR gas passage portion 117. [

Accordingly, the EGR gas can be cooled by the engine cooling water in the water jacket 110 while the EGR gas passes through the EGR gas passage portion, and as a result, the temperature of the EGR gas supplied to each combustion chamber can be lowered in order to reduce the harmful substances in the exhaust gas .

According to the present invention, it is possible to expect a harmful material abatement performance at the level of a cold exhaust gas recirculation system (EGR system) without an EGR cooler for lowering the temperature of the EGR gas, and it is possible to reduce cost by reducing EGR cooler .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Forms are also included within the scope of the present invention.

110: engine 111: intake manifold
112: cylinder head 113: intake port
114: exhaust port 115: exhaust manifold
116: Water jacket 117: EGR gas passage part
121: exhaust pipe 122: EGR pipe
123: EGR actuator 124: branch pipe
131: Turbocharger 132: Turbine
133: compressor 141: intercooler

Claims (4)

An EGR pipe for recirculating the exhaust gas discharged from the combustion chamber of the engine;
An EGR actuator or an EGR valve for controlling an amount of recirculated exhaust gas recirculated through the EGR pipe; And
And an EGR gas passage portion that is formed inside the engine and connected to the intake port of the combustion chamber through the interior of the water jacket for circulating cooling water,
Wherein the recirculation exhaust gas passing through the EGR actuator or the EGR valve is cooled by the cooling water in the water jacket while passing through the EGR gas passage, and then supplied to the combustion chamber through the intake port.
The method according to claim 1,
Wherein a plurality of EGR gas passage portions provided for each combustion chamber are formed in the cylinder head of the engine so that the recirculated exhaust gas passing through each EGR gas passage portion is supplied to the corresponding combustion chamber through the intake port. Gas recirculation system.
The method of claim 2,
Wherein an outlet of the EGR actuator or the EGR valve is connected to each of the EGR gas passage portions by a branch pipe so that the recirculated exhaust gas passing through the EGR actuator or the EGR valve is distributed to the respective EGR gas passage portions through the branch pipe The exhaust gas recirculation system of a car.
The method according to claim 1,
Wherein the EGR gas passage portion is formed by molding a cylinder head material together with an intake port, an exhaust port, and a water jacket at the time of molding the cylinder head.
KR1020160025402A 2016-03-03 2016-03-03 Exhaust Gas Recirculation for vehicle KR20170103090A (en)

Priority Applications (1)

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KR1020160025402A KR20170103090A (en) 2016-03-03 2016-03-03 Exhaust Gas Recirculation for vehicle

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Application Number Priority Date Filing Date Title
KR1020160025402A KR20170103090A (en) 2016-03-03 2016-03-03 Exhaust Gas Recirculation for vehicle

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101976953B1 (en) 2017-11-08 2019-05-09 현대자동차주식회사 Egr valve assembly
CN111486028A (en) * 2020-04-15 2020-08-04 宁波洁程汽车科技有限公司 Engine exhaust gas recirculation integrated mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101976953B1 (en) 2017-11-08 2019-05-09 현대자동차주식회사 Egr valve assembly
CN111486028A (en) * 2020-04-15 2020-08-04 宁波洁程汽车科技有限公司 Engine exhaust gas recirculation integrated mechanism

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