KR100534983B1 - Exhaust Gas Recirculating System - Google Patents

Exhaust Gas Recirculating System Download PDF

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Publication number
KR100534983B1
KR100534983B1 KR10-2002-0071560A KR20020071560A KR100534983B1 KR 100534983 B1 KR100534983 B1 KR 100534983B1 KR 20020071560 A KR20020071560 A KR 20020071560A KR 100534983 B1 KR100534983 B1 KR 100534983B1
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South Korea
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pressure
exhaust gas
exhaust
pipe
intake
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KR10-2002-0071560A
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Korean (ko)
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KR20040043329A (en
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김경모
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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
    • 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
    • F02M26/45—Sensors specially adapted for EGR systems
    • 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
    • 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)
  • Analytical Chemistry (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

본 발명은 배기가스의 일부를 흡기계통으로 재순환시켜 연료의 연소율을 높임으로써 NOx의 발생을 억제하는 배기가스 재순환 장치(EGR)에 관한 것으로, 특히, 흡기압이 배기압 보다 높은 경우 재순환 배기가스를 흡기계통으로 강제 압송할 수 있게 구성된 배기가스 재순환장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation apparatus (EGR) which suppresses generation of NOx by recirculating a portion of the exhaust gas into the intake cylinder to increase the combustion rate of the fuel, and particularly, when the intake pressure is higher than the exhaust pressure, An exhaust gas recirculation apparatus configured to be forcibly pushed into an intake cylinder.

본 발명에 따른 배기가스 재순환장치는, 터보차저를 구비한 엔진에서 상기 터보차저 상류측 배기관에서 배기가스의 일부를 인출하여 냉각한 후 재순환관을 통해 흡기계통으로 재순환시키도록 구성된 배기가스 재순환장치에 있어서, 상기 터보차저에서 압축되어 엔진에 흡입되는 과급공기의 과급압과 엔진 연소실에서 배출되는 배기가스의 배기압을 비교하여 상기 과급압이 더 높은 경우 재순환관 내 배기가스를 흡기계통측으로 강제 압송하는 압송수단;을 포함하여 이루어지며, 이와 같은 구성에 따르면, 배기압이 흡기압 보다 낮은 저속,중속 구간에서도 엔진의 출력 저하 없이 배기가스의 재순환률을 높여 유해가스 발생량을 대폭 줄일 수 있고 고가(高價)의 재순환 밸브(EGR Valve)가 불필요하므로 제작원가가 낮다.The exhaust gas recirculation apparatus according to the present invention includes an exhaust gas recirculation apparatus configured to take a part of the exhaust gas from the turbocharger upstream exhaust pipe in an engine equipped with a turbocharger, cool it, and then recycle it to the intake pipe through the recirculation pipe. When the boost pressure is higher than the boost pressure of the boost air compressed by the turbocharger and sucked into the engine and the exhaust pressure of the exhaust gas discharged from the engine combustion chamber, when the boost pressure is higher, the exhaust gas in the recirculation pipe is forced to the intake pipe side. According to such a configuration, according to such a configuration, even in the low-speed, medium-speed section where the exhaust pressure is lower than the intake pressure, it is possible to greatly reduce the amount of harmful gas generated by increasing the recycle rate of the exhaust gas without lowering the output of the engine, ) The manufacturing cost is low because no EGR valve is needed.

Description

배기가스 재순환장치{Exhaust Gas Recirculating System} Exhaust Gas Recirculating System

본 발명은 배기가스의 일부를 흡기계통으로 재순환(Exhaust Gas Recirculation)시켜 연료의 연소율을 높임으로써 NOx의 발생을 억제하기 위한 배기가스 재순환 장치(Exhaust Gas Recirculating System)에 관한 것으로, 특히, 흡기압이 배기압 보다 높은 경우 재순환 배기가스를 흡기계통으로 강제 압송할 수 있게 구성된 배기가스 재순환장치에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculating system for suppressing generation of NOx by recirculating a part of exhaust gas into an intake cylinder to increase fuel combustion rate. The present invention relates to an exhaust gas recirculation device configured to forcibly push recycle gas to the intake cylinder when the exhaust pressure is higher than the exhaust pressure.

배기가스 재순환 장치(Exhaust Gas Recirculating System)는 배기가스의 일부를 흡기계통으로 재순환시켜 연료 연소율을 높임으로써 NOx 등의 유해가스 발생을 억제할 수 있는 연소효율 개선장치로서 터보 차저를 구비한 엔진에 주로 포함된다.Exhaust gas recirculating system is a combustion efficiency improvement device that can suppress the generation of harmful gases such as NOx by recirculating some of the exhaust gas into the intake pipe to increase fuel combustion rate, and is mainly used for engines with turbochargers. Included.

종래 배기가스 재순환장치는, 도 1에 도시된 바와 같이, 엔진(1)의 배기관(2)에 설치된 재순환밸브(20)를 통해 배기가스의 일부를 인출하고 그것을 재순환관(21)을 거치면서 재순환 냉각기(22)로 냉각시킨 다음 터보 차저(3)에서 과급된 후 인터쿨러(5)에 냉각된 공기가 흐르는 엔진 흡기다기관(6)에 유입시켜 신규 흡입되는 신선한 공기와 함께 엔진(1)의 연소실에 재유입시키도록 구성되어 있었다.In the conventional exhaust gas recirculation apparatus, as shown in FIG. 1, a part of the exhaust gas is drawn out through the recirculation valve 20 installed in the exhaust pipe 2 of the engine 1 and is recirculated while passing it through the recirculation pipe 21. After cooling by the cooler 22 and being charged in the turbocharger 3, the air cooled in the intercooler 5 flows into the engine intake manifold 6 through which the coolant 22 flows into the combustion chamber of the engine 1 together with fresh air freshly sucked. It was configured to reflow.

이와 같은 종래 배기가스 재순환장치는 배기압과 흡기압의 차이에 의해 배기가스를 재순환시키도록 구성되어 있어 배기관(2)내 배기가스 압력이 터보 차저(3)에서 과급된 흡기다기관(6) 내 과급공기의 압력 보다 높을 때만 배기가스를 재순환시킬 수 있다. 따라서 과급 공기압력이 배기압 보다 높은 경우에는 흡기다기관(6) 내 신선한 공기가 재순환관(21)을 따라 오히려 배기관(2)측으로 역류하여 배기가스의 배출효율을 떨어뜨리기 때문에 배기압이 낮은 저속과 중속 구간에서는 엔진(1)의 출력을 떨어뜨릴 수 있다는 문제점이 있었다.Such a conventional exhaust gas recirculation apparatus is configured to recycle the exhaust gas by a difference between the exhaust pressure and the intake pressure so that the exhaust gas pressure in the exhaust pipe 2 is supercharged in the intake manifold 6 in which the turbocharger 3 is supercharged. The exhaust can only be recycled if it is above the air pressure. Therefore, when the boost air pressure is higher than the exhaust pressure, the fresh air in the intake manifold 6 flows back along the recirculation pipe 21 to the exhaust pipe 2 side, thereby reducing the exhaust gas discharge efficiency. In the medium speed section, there is a problem that the output of the engine 1 can be dropped.

본 발명은 상술한 바와 같은 종래 배기가스 재순환장치의 문제점을 해소하기 위하여 안출된 것으로서, 흡기압이 배기압 보다 높은 저,중속 구간에서 재순환 배기가스를 흡기계통으로 강제 압송할 수 있게 구성된 배기가스 재순환장치를 제공하는데 그 목적이 있다. The present invention has been made in order to solve the problems of the conventional exhaust gas recirculation device as described above, the exhaust gas recirculation configured to forcibly push the recycle exhaust gas to the intake cylinder in the low and medium speed section, the intake pressure is higher than the exhaust pressure. The purpose is to provide a device.

본 발명에 따른 배기가스 재순환장치는, 터보차저를 구비한 엔진에서 상기 터보차저 상류측 배기관에서 배기가스의 일부를 인출하여 냉각한 후 재순환관을 통해 흡기계통으로 재순환시키도록 구성된 배기가스 재순환장치에 있어서, 상기 터보차저에서 압축되어 엔진에 흡입되는 과급공기의 과급압과 엔진 연소실에서 배출되는 배기가스의 배기압을 비교하여 상기 과급압이 더 큰 경우 재순환관 내 배기가스를 흡기계통측으로 강제 압송하는 압송수단;을 포함하여 이루어지는 것을 특징으로 한다.The exhaust gas recirculation apparatus according to the present invention includes an exhaust gas recirculation apparatus configured to take a part of the exhaust gas from the turbocharger upstream exhaust pipe in an engine equipped with a turbocharger, cool it, and then recycle it to the intake pipe through the recirculation pipe. When the boost pressure is greater than the boost pressure of the boost air compressed by the turbocharger and sucked into the engine and the exhaust pressure of the exhaust gas discharged from the engine combustion chamber, the exhaust gas in the recirculation pipe is forcibly pumped to the intake pipe side. It characterized in that it comprises a; conveying means.

이상의 구성에 있어서, 상기 압송수단은, 배기관 내 배기압을 검출하는 배기압 감지센서; 터보차저에서 압축된 후 엔진에 흡입되는 흡기관내 흡기압을 검출하는 흡기압 감지센서; 상기 배기압 감지센서와 상기 흡기압 감지센서에서 입력되는 신호에 의해서 배기압과 흡기압을 비교하여 배기압이 흡기압 보다 높은 경우 제어신호를 송출하는 제어부; 상기 제어부의 신호에 의해 오일펌프에 연결된 오일공급관을 개방하는 솔레노이드 밸브; 및 상기 오일공급관을 통해 공급되는 오일의 압력에 의해 작동하여 상기 재순환관내 배기가스를 흡기계통으로 압송하는 압송 플런저;를 포함하여 이루어진다.In the above configuration, the pressure feeding means, the exhaust pressure sensor for detecting the exhaust pressure in the exhaust pipe; An intake pressure sensor for detecting an intake pressure in the intake pipe that is compressed in the turbocharger and then sucked into the engine; A controller for comparing the exhaust pressure with the intake pressure based on a signal input from the exhaust pressure sensor and the intake pressure sensor and transmitting a control signal when the exhaust pressure is higher than the intake pressure; A solenoid valve for opening an oil supply pipe connected to an oil pump by a signal from the controller; And a pressure feeding plunger operating by the pressure of the oil supplied through the oil supply pipe to pump the exhaust gas in the recirculation pipe into the intake pipe.

이하, 바람직한 실시예를 통하여 본 발명에 따른 배기가스 재순환장치의 구성과 작용을 보다 구체적으로 살펴본다.Hereinafter, the configuration and operation of the exhaust gas recirculation apparatus according to the present invention through the preferred embodiment will be described in more detail.

도 2는 본 발명의 일 실시예에 따른 배기가스 재순환장치의 구성도이고, 도 3은 본 발명의 일 실시예에 따른 배기가스 재순환장치의 압송 플런저 확대단면도이다.2 is a configuration diagram of an exhaust gas recirculation apparatus according to an embodiment of the present invention, Figure 3 is an enlarged cross-sectional view of the pressure plunger of the exhaust gas recirculation apparatus according to an embodiment of the present invention.

배기가스 재순환장치는 배기가스의 배기압력에 의해 동작하는 터보 차저(3)로 에어 클리너(8)를 통해 유입된 흡입공기를 과급하여 흡기압을 높인 다음 인터 쿨러(5)로 냉각시켜 엔진(1) 연소실에 공급하고 또한 연소실에서 배출된 고압의 배기가스는 배기관(2)을 통해서 상기 터보 차저(3)를 거쳐 대기 중으로 배출시키도록 구성된 엔진(1)의 흡,배기계통에서, 상기 배기관(2)을 통해 배출되는 배기가스의 일부를 재순환관(10)을 통해 인출한 다음 재순환관(10)을 통하여 재순환냉각기(11)로써 냉각하고 상기 터버 차저(3)와 인터 쿨러(5) 사이의 흡기관(4)에 재유입시켜 흡배기계통을 재순환시키도록 구성된 것으로서, 특히, 본 발명의 일 실시예에 따른 배기가스 재순환장치는, 도 2에 도시된 바와 같이, 배기압력이 터보차저(3)에 의해 과급된 흡기압력 보다 낮은 경우 재순환되는 배기가스를 강제 압송하여 배기가스를 강제 재순환시킴으로써 흡기관(4)의 과급공기가 배기관(2)으로 역류하지 못하도록 구성되어 있다.The exhaust gas recirculation device is a turbocharger (3) operated by the exhaust pressure of the exhaust gas to supercharge the intake air introduced through the air cleaner (8) to increase the intake pressure, and then cool it with the inter cooler (5) to cool the engine (1). In the intake / exhaust system of the engine (1) configured to supply to the combustion chamber and discharge the high pressure exhaust gas discharged from the combustion chamber to the atmosphere via the turbocharger (3) through the exhaust pipe (2), the exhaust pipe (2). A part of the exhaust gas discharged through) is drawn out through the recirculation tube 10 and then cooled by the recirculation cooler 11 through the recirculation tube 10 and sucked between the turbocharger 3 and the inter cooler 5. In particular, the exhaust gas recirculation apparatus according to one embodiment of the present invention is configured to recirculate the intake and exhaust cylinders by re-introduction into the engine 4, and as shown in FIG. 2, exhaust pressure is applied to the turbocharger 3. Lower than the intake pressure supercharged by By forcing the recirculating exhaust gas fed under pressure by forcing the exhaust gas recirculation right it is configured to prevent the supercharged air of the intake pipe (4) countercurrent to the exhaust pipe (2).

이와 같은 작용을 위하여 본 발명의 일 실시예에 따른 배기가스 재순환장치에는 터보차저(3)에서 압축되어 엔진(1)에 흡입되는 과급공기의 과급압과 엔진(1) 연소실에서 배출되는 배기가스의 배기압을 비교하여 상기 과급압이 더 높은 경우 재순환관(10) 내 배기가스를 흡기계통측으로 강제 압송하는 압송수단이 포함된다.To this end, the exhaust gas recirculation apparatus according to an embodiment of the present invention includes the boost pressure of the boost air compressed by the turbocharger 3 and sucked into the engine 1 and the exhaust gas discharged from the combustion chamber of the engine 1. Comparing the exhaust pressure, if the boost pressure is higher, a pressure feeding means for forcibly conveying the exhaust gas in the recirculation pipe 10 to the intake pipe side.

그리고, 그 압송수단은, 배기관(2) 내에서 설치되는 배기압 감지센서(130), 흡기관(4)내에 설치되는 흡기압 감지센서(131), 상기 배기압 감지센서(130)와 흡기압 감지센서(131)에서 입력되는 신호에 의해서 배기압과 흡기압을 비교한 다음 흡기압이 배기압 보다 높은 경우 제어신호를 송출하는 제어부(13), 상기 제어부(13)의 신호에 의해 오일펌프(도시되지 않음)에 연결된 오일공급관(14)을 개방하는 솔레노이드 밸브(15), 그리고, 상기 오일공급관(14)을 통해 공급되는 오일의 압력에 의해 작동하여 상기 재순환관(10)내 배기가스를 흡기계통으로 압송하는 압송 플런저(12) 등으로 구성된다.The pressure feeding means includes an exhaust pressure detecting sensor 130 installed in the exhaust pipe 2, an intake pressure detecting sensor 131 provided in the intake pipe 4, and an exhaust pressure detecting sensor 130 and an intake pressure. Comparing the exhaust pressure and the intake pressure by the signal input from the sensor 131, and the control unit 13 for transmitting a control signal when the intake pressure is higher than the exhaust pressure, by the signal of the oil pump ( (Not shown) to operate the solenoid valve 15 to open the oil supply pipe 14 connected to the oil supply pipe 14, and to operate by the pressure of the oil supplied through the oil supply pipe 14 to inhale the exhaust gas in the recirculation pipe 10. And a feeding plunger 12 for feeding the system.

상기 솔레노이드 밸브(15)의 경우 엔진(1)의 오일펌프(도시되지 않음)에서 인출된 오일공급관(14)상에 설치되어 상기 제어부(13)의 신호에 의해 작동하여 오일공급관(14)을 개폐하도록 구성되어 있으며, 제어부(13)는 각종 센서(130,131)로부터 입력되는 신호에 의해 엔진(1)의 회전수, 흡기관(4)의 흡기압, 배기관(2)의 배기압, 흡입공기의 온도 등에 따라 오일공급관(14)를 개폐할 수 있게 구성된다.The solenoid valve 15 is installed on an oil supply pipe 14 drawn from an oil pump (not shown) of the engine 1 and operated by a signal from the control unit 13 to open and close the oil supply pipe 14. The controller 13 is configured such that the rotation speed of the engine 1, the intake air pressure of the intake pipe 4, the exhaust pressure of the exhaust pipe 2, and the temperature of the intake air are generated by signals input from various sensors 130 and 131. It is configured to open and close the oil supply pipe 14 in accordance with the like.

압송 플런저(12)는, 도 3에 나타난 바와 같이, 상기 오일공급관(14) 선단에 설치된 실린더(120)에 형성된 유압실(120a)과, 상기 실린더(120) 내부에서 유입되는 오일의 압력에 의해 가압되는 가압부(121a), 상기 가압부(121a)와 일체로 형성되어 상기 재순환관(10)의 내부로 전,후진 가능하도록 설치되는 플런저(121) 및, 상기 가압부(121a)를 탄성 지지하는 압축스프링(122)으로 구성되어 있다. 이에, 솔레노이드 밸브(15)가 제어부(13)의 신호에 의해 동작하여 오일공급관(14)을 개방하는 경우 그 오일공급관(14)을 통해 실린더(120)의 유압실(120a)에 유입되어 가압부(121a)에 가해지는 오일 유압에 의해 플런저(121)가 전진하여 재순환관(10)내 배기가스를 가압함으로써 가압된 배기가스가 재순환관(10)을 통해 흡기관(4)으로 재순환되도록 한다. 즉, 배기가스 재순환시 배기관(2)의 배기압이 흡기압 보다 낮은 경우에는 솔레노이드 밸브(15)의 개폐에 따라 실린더(120)에 반복하여 유입되고 회수되는 오일의 유압과 압축스프링(122)의 탄성력에 의해 플런저(121)가 왕복운동하게 되며, 이에, 재순환관(10)에 유입된 배기를 흡기관(4)에 강제 압송하게 된다. 이와 같은 압송 플런저(12)는 배기가스를 강제 압송할 수 있는 예컨대 에어 펌프 등과 같은 다른 수단들로 대체가 가능하다.As illustrated in FIG. 3, the pressure feeding plunger 12 is formed by a hydraulic chamber 120a formed in a cylinder 120 provided at the tip of the oil supply pipe 14 and a pressure of oil flowing into the cylinder 120. The plunger 121 is formed integrally with the pressurizing portion 121a, the pressurizing portion 121a, and is installed to be able to move forward and backward into the recirculation pipe 10 and the pressurizing portion 121a is elastically supported. Compression spring 122 is composed of. Thus, when the solenoid valve 15 is operated by a signal from the control unit 13 to open the oil supply pipe 14, the solenoid valve 15 flows into the hydraulic chamber 120a of the cylinder 120 through the oil supply pipe 14 and pressurizes the pressurized part. The plunger 121 is advanced by the oil hydraulic pressure applied to 121a to pressurize the exhaust gas in the recirculation pipe 10 so that the pressurized exhaust gas is recycled to the intake pipe 4 through the recirculation pipe 10. That is, when the exhaust pressure of the exhaust pipe 2 is lower than the intake pressure during the exhaust gas recirculation, the oil pressure and the compression spring 122 of the oil repeatedly introduced into and recovered from the cylinder 120 are opened and closed according to the opening and closing of the solenoid valve 15. The plunger 121 reciprocates by the elastic force, thereby forcibly feeding the exhaust gas introduced into the recirculation pipe 10 into the intake pipe 4. Such a pressure plunger 12 may be replaced by other means such as, for example, an air pump, capable of forcibly evacuating the exhaust gas.

이상과 같은 구성들로 이루어짐에 따라 본 발명의 일 실시예에 따른 배기가스 재순환장치는 상기 배기관(2)을 통해 배출되는 배기가스의 일부를 재순환관(10)을 통해 인출한 다음 재순환관(10)을 통해 상기 터버 차저(3)와 인터 쿨러 사이(5)의 흡기관(4)으로 재유입시킴으로써 엔진(1)의 연료 연소율을 높여 NOx의 발생을 억제할 수 있다. 특히, 흡기압이 배기압 보다 높은 저속,중속 구간에서는 제어부(13)의 제어에 의해 재순환관(10)을 개폐하는 압송플런저(12)로 재순환관(10)내 배기가스를 흡기관(4)측으로 강제 압송할 수 있으므로 흡기관(4)의 흡입공기가 배기관(2)으로 역류하는 것을 방지할 수 있다. 따라서, 저속과 중속 구간에서 배기가스의 재순환률을 높여 유해가스 발생량을 크게 줄일 수 있으며, 그로 인한 엔진(1) 출력 저하를 막을 수 있다.According to the configuration as described above the exhaust gas recirculation apparatus according to an embodiment of the present invention withdraws a part of the exhaust gas discharged through the exhaust pipe (2) through the recirculation pipe 10 and then the recirculation pipe (10) By reflowing into the intake pipe 4 between the turbocharger 3 and the inter cooler 5 through), the fuel combustion rate of the engine 1 can be increased to suppress the generation of NOx. Particularly, in the low and medium speed sections in which the intake pressure is higher than the exhaust pressure, the exhaust gas in the recirculation pipe 10 is discharged to the intake pipe 4 by the pressure plunger 12 that opens and closes the recirculation pipe 10 under the control of the control unit 13. Since the pressure can be forced to the side, the intake air of the intake pipe 4 can be prevented from flowing back to the exhaust pipe 2. Therefore, it is possible to greatly reduce the amount of harmful gas generated by increasing the recirculation rate of the exhaust gas in the low and medium speed section, thereby preventing the engine 1 output decrease.

이상에서 상세히 설명한 바와 같이 본 발명에 따른 배기가스 재순환장치에 따르면, 상기 배기관을 통해 배출되는 배기가스의 일부를 재순환관을 통해 인출한 다음 재순환관을 통해 상기 터버 차저와 인터 쿨러 사이의 흡기관으로 재유입시킴으로써 엔진의 연료 연소율을 높여 유해가스 배출량을 줄일 수 있는 바, 특히 배기압이 흡기압 보다 낮은 저속,중속 구간에서도 엔진의 출력 저하 없이 배기가스의 재순환률을 높여 유해가스 발생량을 대폭 줄일 수 있으므로 자동차 배출가스로 인한 대기오염을 줄이는데 기여할 수 있다.According to the exhaust gas recirculation apparatus according to the present invention as described in detail above, a part of the exhaust gas discharged through the exhaust pipe is withdrawn through the recirculation pipe and then to the intake pipe between the turbocharger and the intercooler through the recirculation pipe. By re-introducing, it is possible to reduce the emission of harmful gases by increasing the fuel combustion rate of the engine.In particular, it is possible to significantly reduce the amount of harmful gases by increasing the recirculation rate of the exhaust gas without lowering the engine output even in the low and medium speed sections where the exhaust pressure is lower than the intake pressure. Therefore, it can contribute to reducing air pollution caused by automobile emissions.

뿐만 아니라, 본 발명에 따른 배기가스 재순환장치는 기존 배기가스 재순환장치에서 배기가스의 재순환을 위하여 배기관에 별도 설치되어야 했었던 고가(高價)의 재순환 밸브(EGR Valve)의 사용이 배제되어 제작원가가 낮다는 장점도 있다.In addition, the exhaust gas recirculation apparatus according to the present invention is low in production cost by eliminating the use of an expensive recirculation valve (EGR Valve), which had to be installed separately in the exhaust pipe for recirculation of the exhaust gas in the existing exhaust gas recirculation apparatus. There is also an advantage.

도 1은 종래 배기가스 재순환장치의 구성도.1 is a block diagram of a conventional exhaust gas recirculation apparatus.

도 2는 본 발명의 일 실시예에 따른 배기가스 재순환장치의 구성도.2 is a block diagram of an exhaust gas recirculation apparatus according to an embodiment of the present invention.

도 3은 본 발명의 일 실시예에 따른 배기가스 재순환장치의 압송 플런저 확대단면도.Figure 3 is an enlarged cross-sectional view of the pressure plunger of the exhaust gas recirculation apparatus according to an embodiment of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

1 : 엔진 2 : 배기관1: engine 2: exhaust pipe

3 : 터보차저 4 : 흡기관3: turbocharger 4: intake pipe

5 : 인터쿨러 6 : 흡기다기관5: intercooler 6: intake manifold

8 : 에어 클리너 10 : 재순환관8: air cleaner 10: recirculation tube

11 : EGR 쿨러 12 : 압송 플런저11: EGR cooler 12: pressure plunger

13 : 제어부 14 : 오일공급관13 control unit 14 oil supply pipe

15 : 솔레노이드 밸브 120 : 실린더15: solenoid valve 120: cylinder

120a : 유압실 121 : 플런저120a: Hydraulic chamber 121: Plunger

122 : 압축스프링122: compression spring

Claims (2)

터보차저를 구비한 엔진에서 상기 터보차저 상류측 배기관에서 배기가스의 일부를 인출하여 냉각한 후 재순환관을 통해 흡기계통으로 재순환시키도록 구성된 배기가스 재순환장치에 있어서,An exhaust gas recirculation apparatus configured to extract a portion of exhaust gas from an exhaust pipe upstream of a turbocharger in an engine having a turbocharger, cool the exhaust gas, and recirculate it to an intake pipe through a recirculation pipe. 상기 배기관내 배기압을 검출하는 배기압 감지센서; An exhaust pressure sensor for detecting exhaust pressure in the exhaust pipe; 상기 터보차저에서 압축된 후 엔진의 연소실로 흡입되는 흡기관내 흡기압을 검출하는 흡기압 감지센서; An intake pressure sensor for detecting an intake pressure in the intake pipe that is compressed by the turbocharger and then sucked into the combustion chamber of the engine; 상기 배기압 감지센서와 상기 흡기압 감지센서에서 입력되는 신호에 의해서 배기압과 흡기압을 비교하여 흡기압이 배기압 보다 높은 경우 제어신호를 송출하는 제어부; A control unit for comparing the exhaust pressure with the intake pressure based on a signal input from the exhaust pressure sensor and the intake pressure sensor and transmitting a control signal when the intake pressure is higher than the exhaust pressure; 상기 제어부의 신호에 의해 오일펌프에 연결된 오일공급관을 개방하는 솔레노이드 밸브 및; A solenoid valve opening the oil supply pipe connected to the oil pump by a signal from the controller; 상기 오일공급관을 통해 공급되는 오일의 압력에 의해 작동하여 상기 재순환관내 배기가스를 흡기계통으로 압송하도록 상기 오일공급관의 선단에서 유압실을 형성하는 실린더와, 상기 실린더 내부에서 유입되는 오일의 압력에 의해 가압되는 가압부, 상기 가압부와 일체로 형성되어 상기 재순환관의 내부로 전,후진 가능하도록 설치되는 플런저 및, 상기 가압부를 탄성 지지하는 압축스프링을 갖춘 압송 플런저를 포함하여 구성된 것을 특징으로 하는 배기가스 재순환장치. A cylinder which is operated by the pressure of the oil supplied through the oil supply pipe and forms a hydraulic chamber at the tip of the oil supply pipe so as to pump the exhaust gas in the recirculation pipe into the intake pipe, and by the pressure of the oil flowing into the cylinder. A pressurizing part configured to be pressurized, a plunger which is integrally formed with the pressurizing part and installed to be able to move forward and backward into the recirculation pipe, and a pressure feeding plunger having a compression spring that elastically supports the pressurizing part. Gas recirculation unit. 삭제delete
KR10-2002-0071560A 2002-11-18 2002-11-18 Exhaust Gas Recirculating System KR100534983B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373498A (en) * 1979-05-22 1983-02-15 Nissan Motor Company, Limited Exhaust gas recirculation system for internal combustion engine
KR19980047346A (en) * 1996-12-14 1998-09-15 박병재 Exhaust gas recirculation unit (EGR system)
KR19980047133A (en) * 1996-12-13 1998-09-15 박병재 Exhaust gas recirculation unit (EGR system)
JP2000274316A (en) * 1999-03-23 2000-10-03 Toyota Autom Loom Works Ltd Egr device
KR20020041082A (en) * 2000-11-27 2002-06-01 이계안 EGR valve for diesel engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373498A (en) * 1979-05-22 1983-02-15 Nissan Motor Company, Limited Exhaust gas recirculation system for internal combustion engine
KR19980047133A (en) * 1996-12-13 1998-09-15 박병재 Exhaust gas recirculation unit (EGR system)
KR19980047346A (en) * 1996-12-14 1998-09-15 박병재 Exhaust gas recirculation unit (EGR system)
JP2000274316A (en) * 1999-03-23 2000-10-03 Toyota Autom Loom Works Ltd Egr device
KR20020041082A (en) * 2000-11-27 2002-06-01 이계안 EGR valve for diesel engine

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