KR100802701B1 - Suction pressure corresponded exhaust gas circulation system in vehicle - Google Patents

Suction pressure corresponded exhaust gas circulation system in vehicle Download PDF

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KR100802701B1
KR100802701B1 KR1020010062583A KR20010062583A KR100802701B1 KR 100802701 B1 KR100802701 B1 KR 100802701B1 KR 1020010062583 A KR1020010062583 A KR 1020010062583A KR 20010062583 A KR20010062583 A KR 20010062583A KR 100802701 B1 KR100802701 B1 KR 100802701B1
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intake
exhaust gas
bypass line
chamber
negative pressure
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KR1020010062583A
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Korean (ko)
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KR20030030436A (en
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추윤호
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현대자동차주식회사
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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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/002—EGR valve being controlled by vacuum or overpressure
    • 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
    • F02M2026/001—Arrangements; Control features; Details
    • F02M2026/003—EGR valve controlled by air measuring device
    • 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)

Abstract

본 발명은 흡입부압 연동 배기가스 순환 시스템에 관한 것으로, 엔진의 특정조건인 가속시나 아이들시 엔진에서 발생되는 흡기부압을 매개로 EGR가스의 유입을 감소시키거나 차단시켜 항상 안정적인 엔진 운전을 수행함에 그 목적이 있다.The present invention relates to an intake negative pressure linked exhaust gas circulation system, and reduces or blocks the inflow of EGR gas through the intake negative pressure generated in the engine during acceleration or idle, which is a specific condition of the engine. There is a purpose.

상기와 같은 목적을 달성하기 위한 본 발명은, 운전자가 밟는 페달신호와 엔진회전수신호 및 흡기라인을 흐르는 공기량을 제어하는 유량검출기의 개도량신호를 받는 콘트롤러(20)와, 배기가스를 배기인테이크(7)에서 흡기인테이크(5)쪽으로 순환시키도록 연결된 바이패스라인(10)에 구비된 EGR밸브(10')를 콘트롤러(20)의 제어신호에 따라 조작하는 분배기(30) 및 상기 바이패스라인(10)과 흡기인테이크(5)사이에 구비되어 엔진(6)에서 발생된 흡기부압이 증가될수록 EGR가스의 유입량을 저감시키는 감압수단(50)으로 이루어진 것을 특징으로 한다. The present invention for achieving the above object, the controller 20 receives a pedal signal, the engine speed signal and the opening degree signal of the flow rate detector for controlling the amount of air flowing through the intake line, and exhaust gas intake ( The distributor 30 and the bypass line for operating the EGR valve 10 ′ provided in the bypass line 10 connected to circulate toward the intake intake 5 in accordance with the control signal of the controller 20. It is provided between the 10) and the intake intake (5) is characterized in that the pressure reduction means 50 for reducing the inflow of the EGR gas as the intake negative pressure generated in the engine (6) increases.

Description

흡입부압 연동 배기가스 순환 시스템{Suction pressure corresponded exhaust gas circulation system in vehicle}Suction pressure corresponded exhaust gas circulation system in vehicle

도 1은 종래에 따른 배기가스 순환 시스템의 구성도1 is a block diagram of a conventional exhaust gas circulation system

도 2는 본 발명에 따른 흡입부압 연동 배기가스 순환 시스템의 구성도2 is a block diagram of a suction negative pressure interlocking exhaust gas circulation system according to the present invention

도 3은 도 2의 감압수단 구성도
3 is a block diagram of the pressure reducing means of

<도면의 주요부분에 대한 부호의 설명>    <Description of the symbols for the main parts of the drawings>

5 : 흡기인테이크 6 : 엔진5: intake intake 6: engine

7 : 배기인테이크 9 : 배기라인7: exhaust intake 9: exhaust line

10 : 바이패스라인 10' : EGR밸브10: bypass line 10 ': EGR valve

20 : 콘트롤러 30 : 분배기20: controller 30: distributor

50 : 감압수단 51 : 밸브50: decompression means 51: valve

52 : 감압기 53 : 제1챔버52: pressure reducer 53: first chamber

53a : 격벽53a: bulkhead

54 : 제2챔버 54a : 피스톤54: second chamber 54a: piston

54b : 스프링
54b: spring

본 발명은 흡입부압 연동 배기가스 순환 시스템에 관한 것으로, 보다 상세하게는 가속시와 아이들(Idle)시 EGR가스의 유입을 줄여 정상적인 연소가 이루어질 수 있도록 된 흡입부압 연동 배기가스 순환 시스템에 관한 것이다.The present invention relates to a suction inlet pressure linked exhaust gas circulation system, and more particularly, to a suction inlet pressure linked exhaust gas circulation system to reduce the inflow of EGR gas at the time of acceleration and idle (Idle) can be achieved.

일반적으로 디젤엔진의 배기가스 중에는 CO, HC, 및 NOx(질소산화물)등과 같은 유해성분이 다량 포함되어 있는데, 이중 NOx는 연소온도가 높아지면 증가하므로 그 양을 줄이기 위해서 엔진의 연소온도를 감소시키는 다양한 방법이 실시되고 있다.In general, the exhaust gas of diesel engines contains a large amount of harmful components such as CO, HC, and NOx (nitrogen oxide). Among them, NOx increases as the combustion temperature increases, and thus, various types of engine combustion temperatures are reduced to reduce the amount. The method is implemented.

이와 같이, 오염물질인 NOx의 양을 줄이기 위해서는 통상 배기가스 재순환(EGR)장치를 이용하는 방법이 널리 사용되는바, 이와 같은 배기가스 재순환장치는 연소 후 배출되는 배기가스의 일부를 흡입 혼합기에 포함시켜 연소실로 유입시킴으로써 혼합기의 자체 공연비는 변화시키지 않으면서 혼합기의 밀도를 저하시켜 연소온도를 저하시키게 된다.As such, in order to reduce the amount of NOx, which is a pollutant, a method using an exhaust gas recirculation (EGR) device is commonly used. Such an exhaust gas recirculation device includes a part of exhaust gas discharged after combustion in a suction mixer. By entering the combustion chamber, the density of the mixer is lowered without changing the air-fuel ratio of the mixer, thereby lowering the combustion temperature.

즉, 상기 EGR은 엔진의 운전상태에 따라서, NOx의 양을 저감시킬 필요가 있을 때, 배기가스의 일부를 EGR밸브를 통하여 흡기인테이크에 제공하여 혼합기와 함께 연소실로 유입시키면, 상기 연소실로 유입된 배기가스는 불활성가스로서 흡입 가스의 체적은 변화하지 않으므로 상대적으로 혼합기의 밀도가 저하되어 화염의 전파속도를 저하시킴으로써 연소속도가 저하되고, 이에 따라 연소온도의 상승을 방지하여 NOx의 발생을 억제하게 된다.That is, when the EGR needs to reduce the amount of NOx according to the operating state of the engine, when a part of the exhaust gas is supplied to the intake intake through the EGR valve and introduced into the combustion chamber together with the mixer, the EGR flows into the combustion chamber. Since the exhaust gas is an inert gas and the volume of the intake gas does not change, the density of the mixer is relatively lowered and the combustion speed is lowered by lowering the propagation speed of the flame, thereby preventing the rise of the combustion temperature to suppress the generation of NOx. do.

이와 같은 배기가스 재순환장치는 도 1에 도시된 바와 같이 운전자가 밟는 페달신호와 엔진회전수(RPM)신호 및 흡기라인을 흐르는 공기량을 제어하는 유량검출기의 개도량신호를 받는 콘트롤러(20)와, 배기가스에 의해 구동되어 유입되는 외부공기를 압축해 인터쿨러와 공기연결라인을 통해 엔진(6)으로 공급하는 과급기가 연결되는 흡·배기인테이크(5,7)사이를 연결하여 배기가스를 흡기인테이크(5)쪽으로 순환시키는 바이패스라인(10)의 소정 부위에 구비된 EGR밸브(10')를 콘트롤러(20)의 제어신호에 따라 조작하는 분배기(30)로 이루어진다.As shown in FIG. 1, the exhaust gas recirculation apparatus includes a controller 20 which receives a pedal signal, an engine speed (RPM) signal, and an opening degree signal of a flow detector for controlling the amount of air flowing through an intake line, as shown in FIG. 1; Compressed external air driven by the exhaust gas is connected between the intake / exhaust intakes (5, 7) connected to the intercooler and the supercharger supplied to the engine (6) through the air connection line to exhaust the exhaust gas. And a distributor 30 for operating the EGR valve 10 'provided at a predetermined portion of the bypass line 10 to be circulated to 5) according to the control signal of the controller 20.

즉, 상기 콘트롤러(20)의 신호를 받은 분배기(30)에 의해 작동되는 EGR밸브(10')가 진공펌프를 통해 진공압을 전달받아 바이패스라인(10)의 통로를 열어 배기인테이크(7)를 통해 배출되는 배기가스를 흡기인테이크(5)쪽으로 순환시켜 혼합기의 밀도를 희박하게 하여 배기가스내 오염물질의 생성을 저감시키게 된다.That is, the EGR valve 10 'operated by the distributor 30 receiving the signal from the controller 20 receives the vacuum pressure through the vacuum pump to open the passage of the bypass line 10 to exhaust the intake 7. By circulating the exhaust gas discharged through the intake intake (5) to reduce the density of the mixer to reduce the generation of pollutants in the exhaust gas.

그러나, 이와 같은 배기가스 재순환 장치는 디젤엔진의 배기가스 오염물질의 제거를 위해 반드시 필요한 반면 운전성에 악영향을 미치게 되는데 즉, 한번 연소된 가스를 다시 연소실로 공급함으로써 연소효율이 저하될 뿐만 아니라 엔진 부압에 의한 흡입 시 흡입압력이 직접 흡입계로 전달되어 엔진의 정상적인 연소에 충격을 주게 되므로 가속시 특히, 엔진에 의한 흡입부압이 최고에 달하는 아이들시 악영향을 주어 심할 경우 시동이 꺼지는 단점이 있게 된다.However, such an exhaust gas recirculation apparatus is essential for the removal of exhaust gas contaminants of a diesel engine, but adversely affects operability. In other words, the combustion efficiency is lowered by supplying the once-burned gas back to the combustion chamber, and the engine negative pressure is reduced. Inhalation pressure is delivered directly to the intake system, which impacts the normal combustion of the engine, so when the acceleration, especially when the suction inlet pressure by the engine reaches the maximum, adversely affects the start, the start is severe.

이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 엔진의 특정 조건인 가속시나 아이들시 엔진에서 발생되는 흡기부압을 매개로 EGR가스의 유입을 감소시키거나 차단시켜 항상 안정적인 엔진 운전을 수행함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above-mentioned problems, and it is possible to always perform stable engine operation by reducing or blocking the inflow of EGR gas through the intake negative pressure generated in the engine during acceleration or idling, which are specific conditions of the engine. The purpose is.

상기와 같은 목적을 달성하기 위한 본 발명은, 운전자가 밟는 페달신호와 엔진 회전수신호 및 흡기라인을 흐르는 공기량을 제어하는 유량검출기의 개도량신호를 받는 콘트롤러와, 배기가스를 배기인테이크에서 흡기인테이크쪽으로 순환시키도록 연결된 바이패스라인에 구비된 EGR밸브를 콘트롤러의 제어신호에 따라 조작하는 분배기 및 상기 바이패스라인과 흡기인테이크 사이에 구비되어 엔진에서 발생된 흡기 부압이 증가될수록 EGR가스의 유입양을 저감시키는 감압수단으로 이루어진 것을 특징으로 한다.In order to achieve the above object, the present invention provides a controller for receiving a pedal signal, an engine speed signal, and an opening amount signal of a flow rate detector for controlling an amount of air flowing in an intake line, and exhaust gas from an exhaust intake to an intake intake. It is provided between the distributor that operates the EGR valve provided in the bypass line connected to circulate according to the control signal of the controller and between the bypass line and the intake intake to reduce the amount of inflow of EGR gas as the intake negative pressure generated from the engine increases. Characterized in that it consists of a decompression means to.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명에 따른 흡입부압 연동 배기가스 순환 시스템의 구성도를 도시한 것인바, 본 발명은 운전자가 밟는 페달신호와 엔진회전수신호 및 흡기라인을 흐르는 공기량을 제어하는 유량검출기의 개도량신호를 받는 콘트롤러(20)와, 배기가스를 배기인테이크(7)에서 흡기인테이크(5)쪽으로 순환시키도록 연결된 바이패스라인(10)에 구비된 EGR밸브(10')를 콘트롤러(20)의 제어신호에 따라 조작하는 분배기(30) 및 상기 바이패스라인(10)과 흡기인테이크(5)사이에 구비되어 엔진(6)에서 발생된 흡기부압이 증가될수록 EGR가스의 유입량을 감소시키는 감압수단(50)으로 이루어진다.Figure 2 shows the configuration of the intake negative pressure-linked exhaust gas circulation system according to the present invention, the present invention is a pedal signal and the engine speed signal stepped on the driver and the opening degree signal of the flow rate detector for controlling the amount of air flowing through the intake line The control signal of the controller 20 includes an EGR valve 10 'provided in the controller 20 receiving the controller 20 and the bypass line 10 connected to circulate the exhaust gas from the exhaust intake 7 to the intake intake 5. Pressure reducing means (50) provided between the distributor (30) and the bypass line (10) and the intake intake (5) to operate according to the increase intake air pressure generated in the engine (6) to reduce the inflow of EGR gas Is done.

여기서, 상기 감압수단(50)은 EGR밸브(10')의 전단에서 바이패스라인(10)상에 구비된 솔레노이드밸브(51)와, 이 솔레노이드밸브(51)의 전단에 설치된 감압기(52)로 이루어지되, 이 감압기(52)는 바이패스라인(10)을 통해 유입된 EGR가스의 압력을 약 420mmHg에서 280mmHg 로 저하시키는 제1챔버(53)와, 이 제1챔버(53)를 통과한 EGR가스의 압력을 약 180mmHg 정도로 감압시키는 제2챔버(54)로 이루어진다.Here, the pressure reducing means 50 is a solenoid valve 51 provided on the bypass line 10 at the front end of the EGR valve 10 ', and the pressure reducer 52 provided at the front end of the solenoid valve 51. The pressure reducer 52 passes through the first chamber 53 and the first chamber 53 for reducing the pressure of the EGR gas introduced through the bypass line 10 from about 420 mmHg to 280 mmHg. And a second chamber 54 for reducing the pressure of one EGR gas to about 180 mmHg.

상기 제1챔버(53)는 유입된 EGR가스가 팽창되도록 넓은 공간으로 형성되고, 내부에 EGR가스의 흐름 경로를 반복하여 굴곡시키는 격벽(53a)들이 설치된다. 따라서, 상기 제1챔버(53)를 경유한 EGR가스의 압력은 약 420mmHg에서 280mmHg 로 감압된다.The first chamber 53 is formed in a wide space so that the introduced EGR gas is expanded, and partition walls 53a are installed inside the first chamber 53 to repeatedly bend the flow path of the EGR gas. Therefore, the pressure of the EGR gas passing through the first chamber 53 is reduced from about 420 mmHg to 280 mmHg.

또한, 상기 제 2챔버(54)는 제1챔버(53)로부터 감압된 EGR가스가 재팽창되도록 넓은 공간으로 형성되어 약 280mmHg에서 180mmHg 정도로 감압시키는 한편, 그 내부로 스프링(54b)을 매개로 지지된 피스톤(54a)이 바이패스라인(10)으로 통하는 입구와 일정 간격을 유지하여 EGR가스의 배출을 약화시키게 된다.In addition, the second chamber 54 is formed in a wide space to re-expand the EGR gas decompressed from the first chamber 53 to reduce the pressure to about 180mmHg from about 280mmHg, while supporting the spring 54b therein. The piston 54a maintains a predetermined distance from the inlet through the bypass line 10 to weaken the discharge of the EGR gas.

이하 본 발명의 작동을 첨부된 도면을 참조로 상세히 설명한다.Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.

본 발명의 배기가스 순환시스템인 EGR은 전술한 종래의 경우와 같이 운전 조건에 따라 콘트롤러(20)의 신호를 받은 분배기(30)에 의해 EGR밸브(10')가 진공펌프를 통해 진공압을 전달받아 바이패스라인(10)의 통로를 열어 배기인테이크(7)를 통해 배출되는 배기가스를 흡기인테이크(5)쪽으로 순환시켜 혼합기의 밀도를 희박하게 하여 배기가스내 오염물질의 생성을 저감시키게 된다.In the exhaust gas circulation system of the present invention, the EGR valve 10 'transmits the vacuum pressure through the vacuum pump by the distributor 30 receiving the signal from the controller 20 according to the operating conditions as in the conventional case described above. In response, the passage of the bypass line 10 is opened to circulate the exhaust gas discharged through the exhaust intake 7 toward the intake intake 5 to reduce the density of the mixer, thereby reducing the generation of pollutants in the exhaust gas.

이때, 상기 EGR밸브(10')의 개방에 따라 바이패스라인(10)으로 흐르는 약 480mmHg 정도의 압력을 갖는 EGR가스가 감압수단(50)으로 유입되면, 이 감압수단(50)을 통과하는 EGR가스는 최종적으로 약 180mmHg 정도로 감압됨과 동시에 엔진(6)에서 즉, 스로틀밸브(TV)의 전단부위의 흡기인테이크(5)에서 걸리는 흡기 부압의 크기에 따라 흡기인테이크(5)로 유입되는 EGR가스의 양이 증·감되어지게 된다.At this time, when the EGR gas having a pressure of about 480 mmHg flowing into the bypass line 10 is introduced into the decompression means 50 according to the opening of the EGR valve 10 ′, the EGR passing through the decompression means 50 is passed. The gas is finally reduced to about 180 mmHg, and at the same time, the EGR gas flowing into the intake intake 5 depends on the magnitude of the intake negative pressure applied to the engine 6, that is, the intake intake 5 at the front end of the throttle valve TV. The amount will increase and decrease.

즉, 엔진(6)에서 발생되는 흡기부압이 아이들(Idle)시 발생되는 흡기부압인 약 650mmHg 이하인 경우에는 감압수단(50)을 통해 감압된 EGR가스를 엔진(6)으로 유입시켜 EGR가스의 압력에 의한 엔진 흡입계의 가속 쇼크(Shock) 발생을 방지하게 되는데 이는, 상기 EGR가스의 압력이 감압기(52)의 제1챔버(53)로 유입되면서 그 공간에서 팽창하면서 상기 격벽(53a)에 의해 반복적으로 굴곡되는 경로를 거쳐 제2챔버(54)에서 재팽창된 후 약 480mmHg 정도의 압력을 갖는 EGR가스가 순차적으로 280mmHg에서 180mmHg 로 감압되어 흡기인테이크(5)로 유입되어지기 때문이다.That is, when the intake negative pressure generated in the engine 6 is about 650 mmHg or less, which is the intake negative pressure generated at the idle, the decompressed EGR gas is introduced into the engine 6 through the decompression means 50, thereby reducing the pressure of the EGR gas. Acceleration shock (Shock) generation of the engine intake system is prevented by, the pressure of the EGR gas flows into the first chamber 53 of the pressure reducer 52 and expands in the space to the partition 53a. This is because the EGR gas having a pressure of about 480 mmHg is sequentially reduced in pressure from about 280 mmHg to 180 mmHg after being re-expanded in the second chamber 54 through the repeatedly curved path, and flows into the intake intake 5.

또한, 상기 감압기(52)의 제2챔버(54)에 구비된 피스톤(54a)은 스프링(54b)에 의해 제2챔버(54)의 바이패스라인(10)으로 연통된 배출통로 부위를 일정 간격을 유지하면서 차단시켜 결국, 배출되는 EGR가스의 배출량도 크게 저감되어 연소효율에 거의 영향을 주지 않으면서 NOx의 양을 저감시킬수 있게 된다.In addition, the piston 54a provided in the second chamber 54 of the pressure reducer 52 has a constant discharge passage portion communicated with the bypass line 10 of the second chamber 54 by a spring 54b. By blocking the gap while keeping the gap, the amount of emitted EGR gas is also greatly reduced, so that the amount of NOx can be reduced with little effect on combustion efficiency.

한편, 엔진(6)이 아이들(Idle) 상태로 되어 흡기부압인 약 650mmHg 이상이 되는 경우에는 상기 감압수단(50)을 통한 EGR가스의 배출이 전혀 이루어지지 않게 되는데 이는, 엔진(6)쪽에서 발생된 흡기부압이 약 650mmHg 인데 반해 감압기(52)의 제2챔버(54)에 발생된 EGR가스 부압이 약 180mmHg 로 그 부압차가 매우 크게 되고 이에 따라, 상기 흡기인테이크(5)에 연결된 바이패스라인(10)상의 부압에 의해 감압기(52)의 제2챔버(54)에 구비된 피스톤(54a)을 배출통로 쪽으로 잡아 당겨 바이패스라인(10)과 연통된 제2챔버(54)의 배출통로를 차단하기 때문이다.On the other hand, when the engine 6 is in an idle state and the intake negative pressure is about 650 mmHg or more, the discharge of the EGR gas through the decompression means 50 is not performed at all, which occurs on the engine 6 side. The intake negative pressure is about 650 mmHg, whereas the negative pressure difference generated in the second chamber 54 of the pressure reducer 52 is about 180 mmHg, and the negative pressure difference becomes very large, and accordingly, the bypass line connected to the intake intake 5 is performed. The discharge passage of the second chamber 54 which communicates with the bypass line 10 by pulling the piston 54a provided in the second chamber 54 of the pressure reducer 52 toward the discharge passage by the negative pressure on (10). Because it blocks.

이어, 엔진(6)이 아이들 상태를 벗어나 흡기부압이 다시 650mmHg 이하로 되면 전술한 바와 같이 감압기(52)를 통해 약 180mmHg 로 감압된 EGR가스가 유입되어지게 된다.Subsequently, when the engine 6 is out of the idle state and the intake negative pressure becomes 650 mmHg or less again, the EGR gas decompressed to about 180 mmHg is introduced through the pressure reducer 52 as described above.

이상 설명한 바와 같이 본 발명에 의하면, EGR가스를 엔진으로 순환시키도록 배기인테이크와 흡기인테이크사이를 연결하는 바이패스라인상에 감압기를 설치하여 EGR가스의 부압을 크게 저감시켜 엔진으로 유입시켜 EGR가스의 유입에 의한 엔진의 가속쇼크를 방지함은 물론 엔진의 특정조건인 가속시나 아이들시 엔진에서 발생되는 흡기부압을 매개로 EGR가스의 유입을 감소시키거나 차단시켜 오염물질을 저감하면서도 항상 안정적인 엔진 운전을 수행할 수 있는 효과가 있게 된다.As described above, according to the present invention, a pressure reducer is provided on a bypass line connecting the exhaust intake and the intake intake so that the EGR gas is circulated to the engine, thereby greatly reducing the negative pressure of the EGR gas and introducing the EGR gas into the engine. In addition to preventing acceleration of the engine due to inflow, the inlet pressure generated by the engine during acceleration or idle, which is a specific condition of the engine, reduces or blocks the inflow of EGR gas, thereby reducing pollutants while maintaining stable engine operation. There is an effect that can be performed.

Claims (6)

삭제delete 운전자가 밟는 페달신호와 엔진회전수신호 및 흡기라인을 흐르는 공기량을 제어하는 유량검출기의 개도량신호를 받는 콘트롤러(20)와, 배기가스를 배기인테이크(7)에서 흡기인테이크(5)쪽으로 순환시키도록 연결된 바이패스라인(10)에 구비된 EGR밸브(10')를 콘트롤러(20)의 제어신호에 따라 조작하는 분배기(30) 및 상기 바이패스라인(10)과 흡기인테이크(5)사이에 구비되어 엔진(6)에서 발생된 흡기 부압이 증가될수록 EGR가스의 유입량을 저감시키는 감압수단(50)으로 이루어진 흡입 부압 연동 배기가스 순환시스템에 있어서, The controller 20 receives a pedal signal, an engine speed signal, and an opening amount signal of a flow rate detector for controlling the amount of air flowing through the intake line, and the exhaust gas is circulated from the exhaust intake 7 to the intake intake 5. Distributor 30 for operating the EGR valve 10 'provided in the connected bypass line 10 according to the control signal of the controller 20 and between the bypass line 10 and the intake intake 5 are provided. In the intake negative pressure linked exhaust gas circulation system composed of the decompression means 50 for reducing the inflow of EGR gas as the intake negative pressure generated in the engine 6 increases, 상기 감압수단(50)은 EGR밸브(10')의 전단에서 바이패스라인(10)상에 구비된 솔레노이드밸브(51)와, 이 솔레노이드밸브(51)의 전단에 설치된 감압기(52)로 이루어지되, 이 감압기(52)는 바이패스라인(10)을 통해 유입된 EGR가스의 압력을 1차로 저하시키는 제1챔버(53)와, 이 제1챔버(53)를 통과한 EGR가스의 압력을 다시 2차로 감압시키는 제2챔버(54)로 이루어진 것을 특징으로 하는 흡입 부압 연동 배기가스 순환시스템. The pressure reducing means 50 consists of a solenoid valve 51 provided on the bypass line 10 at the front end of the EGR valve 10 'and a pressure reducer 52 provided at the front end of the solenoid valve 51. The pressure reducer 52 has a first chamber 53 which primarily lowers the pressure of the EGR gas introduced through the bypass line 10, and the pressure of the EGR gas that has passed through the first chamber 53. Intake negative pressure interlocking exhaust gas circulation system, characterized in that consisting of a second chamber (54) for decompressing again secondary. 제 2항에 있어서, 상기 제1챔버(53)는 바이패스라인(10)을 흐르는 EGR가스가 팽창되도록 넓은 공간으로 형성되고, 내부에 EGR가스의 흐름 경로를 반복하여 굴곡시키는 격벽(53a)들이 설치된 것을 특징으로 하는 흡입 부압 연동 배기가스 순환시스템. The method of claim 2, wherein the first chamber 53 is formed in a wide space to expand the EGR gas flowing through the bypass line 10, the partition walls 53a for repeatedly bending the flow path of the EGR gas therein are Intake negative pressure linked exhaust gas circulation system, characterized in that installed. 삭제delete 제 2항에 있어서, 상기 제 2챔버(54)는 제1챔버(53)로부터 감압된 EGR가스가 재 팽창되도록 넓은 공간으로 형성되면서 그 내부로 스프링(54b)을 매개로 지지된 피스톤(54a)이 바이패스라인(10)으로 통하는 입구와 일정 간격을 유지하여 EGR가스의 배출을 약화시키는 것을 특징으로 하는 흡입 부압 연동 배기가스 순환시스템. The piston (54a) of claim 2, wherein the second chamber (54) is formed in a wide space such that the EGR gas decompressed from the first chamber (53) is re-expanded, and is supported by the spring (54b) therein. The suction negative pressure interlocking exhaust gas circulation system, characterized in that the discharge of the EGR gas is weakened by maintaining a predetermined interval with the inlet to the bypass line (10). 삭제delete
KR1020010062583A 2001-10-11 2001-10-11 Suction pressure corresponded exhaust gas circulation system in vehicle KR100802701B1 (en)

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KR101328614B1 (en) * 2011-04-20 2013-11-12 (주)대주기계 A pressure deducing device for by-pass line and large - capacity air compressor system therewith

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KR20040023062A (en) * 2002-09-10 2004-03-18 현대자동차주식회사 Egr system
KR100836233B1 (en) * 2007-06-12 2008-06-09 한국기계연구원 Egr moudle simulator

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