KR20040023062A - Egr system - Google Patents

Egr system Download PDF

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Publication number
KR20040023062A
KR20040023062A KR1020020054678A KR20020054678A KR20040023062A KR 20040023062 A KR20040023062 A KR 20040023062A KR 1020020054678 A KR1020020054678 A KR 1020020054678A KR 20020054678 A KR20020054678 A KR 20020054678A KR 20040023062 A KR20040023062 A KR 20040023062A
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South Korea
Prior art keywords
exhaust gas
pressure reducing
pressure
engine
valve
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KR1020020054678A
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Korean (ko)
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추윤호
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현대자동차주식회사
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Priority to KR1020020054678A priority Critical patent/KR20040023062A/en
Publication of KR20040023062A publication Critical patent/KR20040023062A/en

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    • 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
    • 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
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

PURPOSE: An EGR system is provided to improve the accelerating capability of an engine by realizing normal combustion by reducing a pressure of exhaust gas recirculated to the engine. CONSTITUTION: Exhaust gas exhausted from an engine(10) is supplied to the engine again through an EGR(Exhaust Gas Recirculation) valve(20), a pressure reducing valve(30), and a throttle body(40) to lower a combustion temperature of the engine, thereby restricting generation of nitrogen oxides. The pressure reducing valve is installed on a passage connecting the EGR valve with the throttle body to reduce a pressure of the exhaust gas supplied to the throttle body from the EGR valve. The pressure reducing valve is formed of a first pressure reducing chamber(31) firstly reducing the pressure of the exhaust gas exhausted from the EGR valve, and a second pressure reducing chamber(35) secondly reducing the pressure of the exhaust gas exhausted from the first pressure reducing chamber.

Description

배기가스 재순환 시스템{EGR system}Exhaust gas recirculation system {EGR system}

본 발명은 배기가스 재순환 시스템에 관한 것으로, 좀더 상세하게는 엔진으로 재순환되는 배기가스를 감압시켜서 엔진의 운전성능을 향상시킨 배기가스 재순환 시스템에 관한 것이다.The present invention relates to an exhaust gas recirculation system, and more particularly, to an exhaust gas recirculation system in which an exhaust gas recycled to an engine is reduced in pressure to improve operating performance of the engine.

엔진에서 연소후에 배기되는 가스중에는 질소산화물이 존재하는데, 이 가스는 인체에 호흡기 질환등과 같은 질병을 일으키는 원인이 된다. 따라서, 이 질소산화물가스를 줄이기 위한 방안으로 배기가스 재순환 시스템(EGR system)이 개발되어 사용되고 있다.Nitrogen oxides are present in the exhaust gas after combustion in the engine, which causes diseases such as respiratory diseases in the human body. Therefore, an exhaust gas recirculation system (EGR system) has been developed and used as a way to reduce the nitrogen oxide gas.

상기 배기가스 재순환 시스템은 도 1에 도시된 바와 같이, 엔진(1)에서 연소되어 배출된 배기가스를 EGR밸브(3)와 스로틀바디(5)를 통해 다시 엔진(1)으로 공급하여 엔진(1)내의 연소온도를 낮춤으로써 질소산화물의 발생을 억제하는 것이다.As shown in FIG. 1, the exhaust gas recirculation system supplies the exhaust gas combusted and discharged from the engine 1 back to the engine 1 through the EGR valve 3 and the throttle body 5 and thus the engine 1. By lowering the combustion temperature in), the generation of nitrogen oxides is suppressed.

그러나, 상기한 바와 같은 배기가스 재순환 시스템은, 배기가스중의 질소산화물을 저감시키는데는 효과적이지만, 엔진의 운전성능을 떨어뜨리게 되는 문제점이 있었다.However, although the exhaust gas recirculation system as described above is effective in reducing nitrogen oxides in the exhaust gas, there is a problem in that the driving performance of the engine is degraded.

즉, 엔진 부압에 의해 배기가스가 엔진으로 도입되는 과정에서 흡입 압력이 직접 흡입계로 전달되어 정상적인 연소를 방해할 뿐만 아니라, 특히 가속시에는 순간적인 가속이 안되는 헤지테이션(hesitation) 현상이 발생하게 되는 것이다.In other words, in the process of introducing exhaust gas into the engine due to engine negative pressure, the suction pressure is directly transmitted to the intake system, which hinders normal combustion, and in particular, a hesitation phenomenon that does not accelerate momentarily during acceleration occurs. will be.

이에, 본 발명은 상기한 바와 같은 종래의 제 문제점을 해소하기 위해 안출된 것으로, 엔진으로 재순환되는 배기가스를 감압시켜 정상적인 연소가 가능하도록 함으로써 엔진의 운전성능, 특히 가속성능을 향상시키는 배기가스 재순환 시스템을 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, the exhaust gas recirculation to improve the operating performance of the engine, in particular the acceleration performance by reducing the exhaust gas recycled to the engine to enable normal combustion The purpose is to provide a system.

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 배기가스 재순환 시스템은, 엔진에서 연소되어 배출된 배기가스를 스로틀바디를 통해 다시 엔진으로 공급하기 위한 EGR 밸브와, 상기 EGR 밸브에서 스로틀바디로 공급되는 배기가스의 압력을 감소시키기 위한 감압밸브를 포함하여 구성된 것을 특징으로 한다.Exhaust gas recirculation system according to the present invention for achieving the object as described above, the EGR valve for supplying the exhaust gas discharged by combustion from the engine back to the engine through the throttle body, the supply to the throttle body from the EGR valve Characterized in that it comprises a pressure reducing valve for reducing the pressure of the exhaust gas.

상기 감압밸브는 상기 EGR 밸브에서 배출되는 배기가스를 1차로 감압하는 제1감압실과, 상기 제1감압실에서 배출되는 배기가스를 2차로 감압시키는 제2감압실을 포함하여 구성된 것을 특징으로 한다.The pressure reducing valve may include a first pressure reducing chamber configured to primarily reduce the exhaust gas discharged from the EGR valve, and a second pressure reducing chamber configured to reduce the exhaust gas discharged from the first pressure reducing chamber in a second manner.

상기 제1감압실에는, 배기가스의 유로를 굴곡시키기 위한 다수개의 돌출부가 형성되어 있는 것을 특징으로 한다.The first pressure reducing chamber is characterized in that a plurality of protrusions for bending the flow path of the exhaust gas is formed.

상기 제2감압실에는, 플레이트와, 스프링이 설치되어 있고, 상기 플레이트는 흡입 부압력이 상기 스프링의 인장력 이상으로 커지면 상기 스프링의 인장력을 극복하고 이동하여 배기가스 출구를 막도록 되어 있는 것을 특징으로 한다.The second decompression chamber is provided with a plate and a spring, and the plate is configured to overcome the tension force of the spring and move to block the exhaust gas outlet when the suction negative pressure becomes greater than the tension force of the spring. do.

도 1은 종래 기술에 따른 배기가스 재순환 시스템의 계통도,1 is a system diagram of an exhaust gas recirculation system according to the prior art,

도 2는 본 발명에 따른 배기가스 재순환 시스템의 계통도이다.2 is a system diagram of an exhaust gas recirculation system according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

10 : 엔진20 : EGR 밸브10: engine 20: EGR valve

30 : 감압밸브40 : 스로틀바디30: pressure reducing valve 40: throttle body

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 2는 본 발명에 따른 배기가스 재순환 시스템의 계통도로서, 도 2에서 참조부호 "10"은 엔진, "20"은 EGR 밸브, "30"은 감압밸브, "40"은 스로틀바디이다.2 is a system diagram of an exhaust gas recirculation system according to the present invention, in which reference numeral 10 denotes an engine, 20 denotes an EGR valve, 30 denotes a pressure reducing valve, and 40 denotes a throttle body.

상기 엔진(10)에서 연소되어 배출되는 배기가스는 EGR밸브(20)와 감압밸브(30) 및 스로틀바디(40)를 통해 다시 엔진(10)으로 공급되어 엔진(1)내의 연소온도를 낮춤으로써 질소산화물의 발생을 억제한다.The exhaust gas combusted and discharged from the engine 10 is supplied back to the engine 10 through the EGR valve 20, the pressure reducing valve 30, and the throttle body 40 to lower the combustion temperature in the engine 1. Suppresses the generation of nitrogen oxides.

상기 감압밸브(30)는 상기 EGR 밸브(20)와 스로틀바디(40)를 연결하는 유로상에 설치되어, 상기 EGR 밸브(20)에서 스로틀바디(40)로 공급되는 배기가스의 압력을 감소시키도록 되어 있는 것으로, 상기 EGR 밸브(20)에서 배출되는 배기가스를 1차로 감압하는 제1감압실(31)과, 상기 제1감압실(31)에서 배출되는 배기가스를 2차로 감압시키는 제2감압실(35)을 포함하여 구성되어 있다.The pressure reducing valve 30 is installed on a flow path connecting the EGR valve 20 and the throttle body 40 to reduce the pressure of the exhaust gas supplied from the EGR valve 20 to the throttle body 40. The first pressure reducing chamber 31 for firstly reducing the exhaust gas discharged from the EGR valve 20, and the second pressure reducing secondary exhaust gas discharged from the first pressure reducing chamber 31. It is comprised including the decompression chamber 35.

상기 제1감압실(31)에는, 배기가스의 유로를 굴곡시키기 위한 다수개의 돌출부(32, 33, 34)가 형성되어 있다. 또한, 상기 제2감압실(35)에는, 플레이트(36)와, 스프링(37)이 설치되어 있고, 상기 플레이트(36)는 흡입 부압력이 상기 스프링(37)의 인장력 이상으로 커지면 상기 스프링(37)의 인장력을 극복하고 이동하여 배기가스 출구를 막도록 되어 있다.The first pressure reducing chamber 31 is provided with a plurality of protrusions 32, 33, 34 for bending the flow path of the exhaust gas. In addition, the second pressure reducing chamber 35 is provided with a plate 36 and a spring 37. When the suction negative pressure becomes greater than the tensile force of the spring 37, the spring ( It overcomes the tension of 37) and moves to block the exhaust gas outlet.

상기와 같이 구성된 본 발명에 따른 배기가스 재순환 시스템의 작용 및 효과를 상세히 설명하면 다음과 같다.Referring to the operation and effect of the exhaust gas recirculation system according to the present invention configured as described above in detail as follows.

엔진(10)에서 연소되어 배출되는 배기가스는 EGR밸브(20)와 감압밸브(30) 및 스로틀바디(40)를 통해 다시 엔진(10)으로 공급된다.The exhaust gas combusted and discharged from the engine 10 is supplied to the engine 10 again through the EGR valve 20, the pressure reducing valve 30, and the throttle body 40.

이때, 상기 EGR 밸브(20)에서 빨아들이는 흡입 압력은 대략 420mmHg 정도인데, 이 압력이 바로 엔진(10)의 흡입계로 바로 전달되면 가속 쇼트등이 발생하여 엔진(10)의 운전성능을 열화시키므로, 대략 180mmHg 이하까지 감압시켜 줄 필요가 있다.At this time, the suction pressure sucked by the EGR valve 20 is about 420mmHg, and when this pressure is directly transmitted to the intake system of the engine 10, an acceleration short occurs, thereby deteriorating the driving performance of the engine 10. It is necessary to reduce the pressure to approximately 180 mmHg or less.

상기와 같이 재순환되는 배기가스의 감압은 감압밸브(30)에서 이루어지는데, 상기 감압밸브(30)의 제1감압실(31)에서는 EGR 밸브(20)를 통해 공급되는 420mmHg의 배기가스가 돌출부(32, 33, 34)에 의해 굴곡되면서 진행함과 더불어 상기 돌출부(32, 33, 34)의 저항으로 인해 280mmHg까지 감압된다.Reduction of the exhaust gas recycled as described above is performed in the pressure reducing valve 30. In the first pressure reducing chamber 31 of the pressure reducing valve 30, the exhaust gas of 420 mmHg supplied through the EGR valve 20 is projected. While being bent by 32, 33, and 34, the pressure of the protrusions 32, 33, and 34 is reduced to 280 mmHg due to the resistance.

상기와 같이 1차로 280mmHg까지 감압된 배기가스는 상기 감압밸브(30)의 제2감압실(35)에서 플레이트(36) 사이를 통과하여 출구로 배출되면서 2차로 180mmHg까지 감압된다.As described above, the exhaust gas, which has been primarily decompressed to 280 mmHg, is discharged through the second pressure reducing chamber 35 of the decompression valve 30 between the plates 36 and discharged to the outlet, and decompressed to 180 mmHg secondly.

즉, 배기가스 재순환시에 플레이트(36)는 스프링(37)의 인장력 때문에 출구를 완전히 막지는 않으면서도 출구를 좁게 만들어서 스로틀바디(40)로 공급되는 배기가스량을 적게하여 2차로 감압하게 되는 것이다.That is, during exhaust gas recirculation, the plate 36 narrows the outlet without completely blocking the outlet due to the tension of the spring 37, thereby reducing the amount of exhaust gas supplied to the throttle body 40 to reduce the secondary pressure.

그러나, 아이들 운전시에는 흡입 부압이 가장 크게 되어 650mmHg 이상으로 되므로, 상기 흡입 부압에 의해 플레이트(36)가 스프링(37)의 인장력을 극복하고 이동하여 출구를 완전히 막아줌에 따라 배기가스가 스로틀바디(40)를 통해 엔진(10)으로 공급되지 않게 되어, 아이들 운전성능을 크게 향상시킬 수 있다.However, during idle operation, the suction negative pressure becomes the largest and becomes 650 mmHg or more. As the plate negative pressure of the plate 36 moves over the tension force of the spring 37 and completely blocks the outlet, the exhaust gas is throttled. Since it is not supplied to the engine 10 through the 40, it is possible to greatly improve the idle driving performance.

이상에서 설명한 바와 같이 본 발명에 따르면, 엔진으로 재순환되는 배기가스를 감압시켜 정상적인 연소가 가능하도록 함으로써 엔진의 운전성능 특히 가속성능을 크게 향상시킬 수 있는 효과가 있다.As described above, according to the present invention, by reducing the exhaust gas recycled to the engine to enable normal combustion, the driving performance of the engine, particularly the acceleration performance, can be greatly improved.

Claims (4)

엔진에서 연소되어 배출된 배기가스를 스로틀바디를 통해 다시 엔진으로 공급하기 위한 EGR 밸브와, 상기 EGR 밸브에서 스로틀바디로 공급되는 배기가스의 압력을 감소시키기 위한 감압밸브를 포함하여 구성된 것을 특징으로 하는 배기가스 재순환 시스템.EGR valve for supplying the exhaust gas discharged by the engine discharged back through the throttle body, and a pressure reducing valve for reducing the pressure of the exhaust gas supplied from the EGR valve to the throttle body, characterized in that it comprises Exhaust gas recirculation system. 제 1 항에 있어서, 상기 감압밸브는 상기 EGR 밸브에서 배출되는 배기가스를 1차로 감압하는 제1감압실과, 상기 제1감압실에서 배출되는 배기가스를 2차로 감압시키는 제2감압실을 포함하여 구성된 것을 특징으로 하는 배기가스 재순환 시스템.The pressure reducing valve of claim 1, wherein the pressure reducing valve includes a first pressure reducing chamber configured to primarily reduce the exhaust gas discharged from the EGR valve, and a second pressure reducing chamber configured to reduce the exhaust gas discharged from the first pressure reducing chamber in a second manner. Exhaust gas recirculation system, characterized in that configured. 제 2 항에 있어서,The method of claim 2, 상기 제1감압실에는, 배기가스의 유로를 굴곡시키기 위한 다수개의 돌출부가 형성되어 있는 것을 특징으로 하는 배기가스 재순환 시스템.The first pressure reducing chamber, the exhaust gas recirculation system, characterized in that a plurality of protrusions for bending the flow path of the exhaust gas is formed. 제 2 항에 있어서,상기 제2감압실에는, 플레이트와, 스프링이 설치되어 있고, 상기 플레이트는 흡입 부압력이 상기 스프링의 인장력 이상으로 커지면 상기 스프링의 인장력을 극복하고 이동하여 배기가스 출구를 막도록 되어 있는 것을 특징으로 하는 배기가스 재순환 시스템.The second pressure reducing chamber is provided with a plate and a spring. When the suction negative pressure becomes greater than the tension of the spring, the plate overcomes the tension of the spring and moves to block the exhaust gas outlet. Exhaust gas recirculation system according to claim 1.
KR1020020054678A 2002-09-10 2002-09-10 Egr system KR20040023062A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61120017U (en) * 1985-01-16 1986-07-29
KR960008005A (en) * 1994-08-31 1996-03-22 한승준 Back pressure reduction device of exhaust muffler
JPH08109854A (en) * 1994-10-12 1996-04-30 Nissan Motor Co Ltd Exhaust reflux control device for internal combustion engine
KR19990039692U (en) * 1998-04-16 1999-11-15 홍종만 Vehicle Exhaust Gas Recirculation System
KR20030030436A (en) * 2001-10-11 2003-04-18 현대자동차주식회사 Suction pressure corresponded exhaust gas circulation system in vehicle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61120017U (en) * 1985-01-16 1986-07-29
KR960008005A (en) * 1994-08-31 1996-03-22 한승준 Back pressure reduction device of exhaust muffler
JPH08109854A (en) * 1994-10-12 1996-04-30 Nissan Motor Co Ltd Exhaust reflux control device for internal combustion engine
KR19990039692U (en) * 1998-04-16 1999-11-15 홍종만 Vehicle Exhaust Gas Recirculation System
KR20030030436A (en) * 2001-10-11 2003-04-18 현대자동차주식회사 Suction pressure corresponded exhaust gas circulation system in vehicle

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