KR20080049401A - A egr cooler inserting a catalytic filter - Google Patents

A egr cooler inserting a catalytic filter Download PDF

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Publication number
KR20080049401A
KR20080049401A KR1020060119916A KR20060119916A KR20080049401A KR 20080049401 A KR20080049401 A KR 20080049401A KR 1020060119916 A KR1020060119916 A KR 1020060119916A KR 20060119916 A KR20060119916 A KR 20060119916A KR 20080049401 A KR20080049401 A KR 20080049401A
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South Korea
Prior art keywords
cooler
filter
egr
flange
circular opening
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KR1020060119916A
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Korean (ko)
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김용균
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현대자동차주식회사
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Priority to KR1020060119916A priority Critical patent/KR20080049401A/en
Publication of KR20080049401A publication Critical patent/KR20080049401A/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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • 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
    • F02M26/30—Connections of coolers to other devices, e.g. to valves, heaters, compressors or filters; Coolers characterised by their location on the engine
    • 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)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

An exhaust gas recirculation cooler having a catalytic filter is provided to achieve complete oxidation of soot accumulated in an exhaust gas recirculation cooler by using a post injection scheme. An exhaust gas recirculation cooler having a catalytic filter comprises a flange(60) and a catalytic filter(65). The flange has a circular opening section at the central portion thereof such that an exhaust gas recirculation pipe communicates with an exhaust gas recirculation cooler(55). The catalytic filter is inserted into the flange to facilitate the oxidation of soot of a PM filter installed in the exhaust gas recirculation cooler. The catalytic filter has a size corresponding to the diameter of the circular opening section such that the catalytic filter is inserted into the circular opening section of the flange. The catalytic filter has a guide section(70), which is made of rubber, at the outer peripheral surface thereof.

Description

촉매필터가 적용된 이지알 쿨러{A EGR cooler inserting a catalytic filter}EGR cooler inserting a catalytic filter

도 1은 종래 기술에 따른 이지알(EGR) 쿨러가 설치되는 위치와 그 연결상태를 나타낸 개략도이다.1 is a schematic view showing the position and the connection state of the EEG (EGR) cooler is installed according to the prior art.

도 2a 및 도 2b는 종래 기술에 따른 이지알(EGR) 쿨러의 다양한 예를 나타낸 사시도이다.2A and 2B are perspective views illustrating various examples of an EEG cooler according to the prior art.

도 3은 본 발명에 따른 촉매필터가 적용된 이지알(EGR) 쿨러의 바람직한 일실시예를 나타낸 사시도이다.Figure 3 is a perspective view showing a preferred embodiment of the EGR (EGR) cooler to which the catalyst filter is applied according to the present invention.

도 4는 도 3의 구성 중 촉매필터를 나타낸 사시도이다.4 is a perspective view illustrating a catalyst filter in the configuration of FIG. 3.

<도면의 주요 부분에 관한 부호의 간단한 설명><Simple description of the code for the main part of the drawing>

55: EGR쿨러 60: 플랜지55: EGR cooler 60: flange

65: 촉매필터 70: 가이드부65: catalyst filter 70: guide part

본 발명은 촉매필터가 적용된 이지알(EGR) 쿨러에 관한 것으로서, 보다 상세하게는 EGR쿨러의 양단부에 해당되는 플랜지에 촉매필터를 추가 적용함으로써, 상기 EGR쿨러 내부에 퇴적되는 슈트(SOOT)를 산화시키는 PM필터의 산화작용을 촉진하여 상기 EGR쿨러의 효율을 증진시킬 수 있는 촉매필터가 적용된 이지알(EGR) 쿨러에 관한 것이다.The present invention relates to an EGR cooler to which a catalyst filter is applied. More specifically, the catalyst filter is applied to a flange corresponding to both ends of the EGR cooler, thereby oxidizing a SOOT deposited inside the EGR cooler. The present invention relates to an EGR cooler to which a catalytic filter is applied, which promotes oxidation of a PM filter to enhance the efficiency of the EGR cooler.

도 1은 종래 기술에 따른 이지알(EGR) 쿨러가 설치되는 위치와 그 연결상태를 나타낸 개략도이고, 도 2a 및 도 2b는 종래 기술에 따른 이지알(EGR) 쿨러의 다양한 예를 나타낸 사시도이다.1 is a schematic view showing a position and a connection state of the EEG (EGR) cooler is installed according to the prior art, Figures 2a and 2b is a perspective view showing various examples of the EEG (EGR) cooler according to the prior art.

일반적으로 디젤엔진은 그 연료가 경유로서 휘발성이 약하여 연소실의 점화방법으로 직접분사방식을 채택하고 있다. 그런데 최초시동시 엔진(10)은 냉각되어 있는 상태이므로 설정된 온도로 상승될 때까지는 연소되지 않은 배기가스가 그대로 대기중으로 방출되므로 탄화수소, NOx 등의 유해물질이 배출되어 대기를 오염시키게 된다.In general, diesel engines use direct injection as a method of igniting the combustion chamber because the fuel is light and has low volatility. However, since the engine 10 is cooled during the initial start-up, the exhaust gas that is not combusted is released into the atmosphere until the temperature is raised to a predetermined temperature, so that harmful substances such as hydrocarbons and NOx are discharged to pollute the air.

따라서, 이러한 문제점을 해결하고자 도 1에서와 같이 엔진(10)의 배기 매니폴드(11)에서 방출되는 배기가스의 일부를 흡기 매니폴드(12)측으로 유도하기 위한 EGR파이프(13)가 형성되고, 상기 EGR파이프(13)의 도중에는 EGR밸브(14)가 형성되어 엔진(10)의 운전상황에 따라서 상기한 EGR파이프(13)를 통해서 배기가스가 흡기계측으로 유도될 수 있도록 구성된다. 그리고 상기한 EGR파이프(13)의 도중에는 재순환되는 배기가스의 온도를 적정하게 유지시켜주기 위한 EGR쿨러(20)가 장착되어 있다.Therefore, to solve this problem, as shown in FIG. 1, an EGR pipe 13 for guiding a part of the exhaust gas emitted from the exhaust manifold 11 of the engine 10 toward the intake manifold 12 is formed. An EGR valve 14 is formed in the middle of the EGR pipe 13 so that the exhaust gas can be led to the intake side through the EGR pipe 13 according to the operating situation of the engine 10. In the middle of the above-described EGR pipe 13, an EGR cooler 20 is installed to keep the temperature of the exhaust gas recycled appropriately.

즉, 엔진(10)의 운전상황에 따라서 상기 EGR밸브(14)가 자동으로 개방됨에 따라서 일부의 배기가스는 상기 EGR파이프(13)를 통과하게 되는데, 이 과정에서 상기 EGR쿨러(20)에 의해서 EGR가스가 냉각되어 흡기계측으로 유도되는 것이다.That is, some of the exhaust gas passes through the EGR pipe 13 as the EGR valve 14 is automatically opened according to the operating condition of the engine 10. In this process, the exhaust gas is passed by the EGR cooler 20. EGR gas is cooled and guided to the intake side.

상기한 EGR쿨러(20)는 재순환되는 배기가스의 온도를 낮춤으로써 밀도를 높이고 배기가스가 흡기의 흐름에 원활히 혼합된 상태로 연소실에 유입되도록 하여 재연소되도록 함으로써, 대기중으로 방출되는 탄화수소, NOx 등의 유해성분의 배출을 줄여 대기오염을 줄이기 위한 것이다. 이와 같은 상기 EGR쿨러(20)의 다양한 예가 도 2a 및 도 2b에 도시되어 있다.The EGR cooler 20 increases the density by lowering the temperature of the exhaust gas to be recycled and allows the exhaust gas to be introduced into the combustion chamber in a state in which the exhaust gas is smoothly mixed with the intake stream so as to be re-burned, hydrocarbons, NOx, etc. released into the atmosphere To reduce air pollution by reducing the emission of harmful constituents. Various examples of such an EGR cooler 20 are shown in FIGS. 2A and 2B.

이와 같은 EGR쿨러(20a,20b)의 내부에는 향후 강화되는 배기가스 규제(예컨대 EURO-5)를 만족시키기 위하여 디젤엔진 배기가스 후처리장치로서 PM필터가 적용되는 것이 필수적이다.Inside the EGR coolers 20a and 20b, it is essential to apply a PM filter as a diesel engine exhaust gas aftertreatment device in order to satisfy the tightening exhaust gas regulations (for example, EURO-5).

그런데, 상기 PM필터는 무한정하게 사용되는 것은 아니며, 일정기간 사용 후 상기 PM필터 내부에 슈트(SOOT)가 포집되면 연료를 후분사(Post Injection)시켜 연소실을 지나 상기 배기 매니폴드(11)에서 연료가 연소되어 발생되는 열을 이용하여 상기 PM필터 내부에 포집된 상기 슈트(SOOT)를 강제로 연소시킴에 의하여 상기 PM필터를 재생시키게 되는 것이다.However, the PM filter is not used indefinitely. If a SOOT is collected inside the PM filter after a certain period of use, the PM filter is post-injected to the fuel, passing through a combustion chamber, and then fueled in the exhaust manifold 11. The PM filter is regenerated by forcibly burning the chute (SOOT) collected inside the PM filter using heat generated by combustion.

그러나, 상기한 바와 같은 종래 기술에 따른 이지알(EGR) 쿨러(20a,20b)는, 상술한 연료후분사(Post Injection)방식으로 상기 PM필터를 재생시킴에 있어서, 상 기 PM필터의 재생에 필요한 충분한 고온의 배기가스를 얻기 힘들어 상기 슈트(SOOT)의 완전한 산화에 어려움이 있으며, 이에 따라 상기 PM필터의 완전한 재생이 이루어지지 않는 문제점이 있다. However, the above-described EEG coolers 20a and 20b according to the prior art regenerate the PM filter by the above-described post injection method. Since it is difficult to obtain sufficient high-temperature exhaust gas, it is difficult to completely oxidize the chute, and thus there is a problem that the full regeneration of the PM filter is not performed.

본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, EGR쿨러의 입구부 및 출구부에 형성된 플랜지의 형상 변경 없이 삽입가능하도록 구성된 촉매필터를 추가 적용함으로써 연료후분사방식을 이용하여 상기 EGR쿨러 내부에 퇴적된 슈트(SOOT)의 완전한 산화가 이루어지도록 하여 상기 EGR쿨러의 효율을 유지시킬 수 있는 촉매필터가 적용된 이지알 쿨러를 제공하는데 그 목적이 있다.The present invention has been made in order to solve the above problems, the EGR cooler using the after-fuel injection method by additionally applying a catalyst filter configured to be inserted without changing the shape of the flange formed in the inlet and outlet of the EGR cooler It is an object of the present invention to provide an EG cooler to which a catalyst filter capable of maintaining the efficiency of the EGR cooler by performing complete oxidation of a SOOT deposited therein.

상기한 기술적 과제를 해결하기 위한 본 발명에 따른 촉매필터가 적용된 이지알 쿨러는, 양단부에 형성된 플랜지에 각각 EGR파이프가 연결되는 EGR쿨러에 있어서, EGR파이프와 상기 EGR쿨러 내부가 서로 연통되도록 중간부분에 원형개구부가 형성된 플랜지에 상기 EGR쿨러의 내부에 구비된 PM필터의 슈트(SOOT)에 대한 산화를 촉진시키는 촉매필터가 삽입 장착된 것을 특징으로 한다.In the EGR cooler to which the catalyst filter according to the present invention for solving the above technical problem is applied, the EGR pipe is connected to flanges formed at both ends thereof, the middle part such that the EGR pipe and the inside of the EGR cooler communicate with each other. In the flange is formed in the circular opening is characterized in that the catalytic filter for promoting the oxidation of the chute (SOOT) of the PM filter provided in the interior of the EGR cooler is inserted.

또한, 상기 촉매필터는, 상기 플랜지의 원형개구부에 삽입 장착되도록 상기 원형개구부의 직경에 대응되는 크기로 형성된 것을 특징으로 한다. In addition, the catalyst filter, characterized in that formed in the size corresponding to the diameter of the circular opening to be inserted into the circular opening of the flange.

또한, 상기 촉매필터의 외주면에는 고무재질의 가이드부가 구비된 것을 특징 으로 한다.In addition, the outer peripheral surface of the catalyst filter is characterized in that the rubber guide portion provided.

또한, 상기 가이드부는, 일측이 상기 원형개구부의 직경보다 다소 크게 형성되어, 상기 촉매필터가 상기 원형개구부에 삽입 장착될 때, 상기 플랜지의 일측면과 상기 EGR파이프의 단부에 끼워지도록 구성된 것을 특징으로 한다.In addition, the guide portion, one side is formed to be somewhat larger than the diameter of the circular opening, when the catalyst filter is inserted into the circular opening, characterized in that configured to be fitted to one side of the flange and the end of the EGR pipe. do.

이하, 본 발명에 따른 촉매필터가 적용된 이지알 쿨러의 바람직한 일실시예를 첨부된 도면을 참조하여 상세하게 설명하기로 한다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the EG cooler to which the catalyst filter according to the present invention is applied will be described in detail.

도 3은 본 발명에 따른 촉매필터가 적용된 이지알(EGR) 쿨러의 바람직한 일실시예를 나타낸 사시도이고, 도 4는 도 3의 구성 중 촉매필터를 나타낸 사시도이다.Figure 3 is a perspective view showing a preferred embodiment of the EGR (EGR) cooler to which the catalyst filter is applied according to the present invention, Figure 4 is a perspective view showing the catalyst filter of the configuration of FIG.

본 발명에 따른 촉매필터가 적용된 이지알(EGR) 쿨러는, 종래와 마찬가지로 EGR파이프 상에 위치되어 양단부에 상기 EGR파이프가 연결되도록, 그 양단부에는 연결부재로서 플랜지(60)가 구비된다.The EEG cooler to which the catalyst filter according to the present invention is applied is positioned on the EGR pipe as in the prior art, and the flange 60 is provided at both ends thereof so that the EGR pipes are connected at both ends thereof.

상기 플랜지(60)는 양단부에 체결공이 형성되되, 전체적으로는 상기 EGR쿨러(55)의 양단부에 밀착되도록 평평한 형상을 가지며, 그 중간부분은 원형개구부가 형성되어 상기 EGR파이프와 상기 EGR쿨러(55)의 내부가 서로 연통되도록 되어 있다.The flange 60 has fastening holes formed at both ends thereof, and has a flat shape so as to be in close contact with both ends of the EGR cooler 55 as a whole, and a middle opening thereof is formed with a circular opening to form the EGR pipe and the EGR cooler 55. The interiors of the are in communication with each other.

상기 플랜지(60)의 원형개구부에는 촉매필터(65)가 삽입 장착된다. 상기 촉매필터(65)는 상기 EGR쿨러(55) 내부에 퇴적되는 슈트(SOOT)의 완전한 산화를 돕는 산화촉매필터로 구성되는 것이 바람직하다.The catalyst filter 65 is inserted into the circular opening of the flange 60. The catalyst filter 65 is preferably composed of an oxidation catalyst filter which helps complete oxidation of the SOOT deposited in the EGR cooler 55.

상기 촉매필터(65)는 상기 원형개구부에 삽입되어 장착될 수 있도록, 상기 원형개구부의 직경에 대응되는 크기로 형성된다. The catalyst filter 65 is formed to have a size corresponding to the diameter of the circular opening to be inserted into the circular opening.

상기 촉매필터(65)에의 외주면에는 고무재질의 가이드부(70)가 구비된다. 상기 가이드부(70)는 상기 촉매필터(65)를 상기 원형개구부에 삽입 장착함에 있어서, 그 장착이 용이하도록 함은 물론, 장착된 후에 상기 촉매필터(65)가 상기 원형개구부로부터 유동되거나 쉽게 탈거되는 현상을 방지하는 역할을 담당한다.A rubber guide portion 70 is provided on the outer circumferential surface of the catalyst filter 65. The guide part 70 facilitates the mounting of the catalyst filter 65 in the circular opening, and of course, the catalyst filter 65 flows or is easily removed from the circular opening after being mounted. It plays a role in preventing the phenomenon.

한편, 상기 가이드부(70)는 도 4에 도시된 바와 같이, 일측이 상기 원형개구부의 직경보다 다소 크게 형성되어, 상기 원형개구부에 상기 촉매필터(65)가 삽입 장착될 때, 상기 가이드부(70)의 일측이 상기 플랜지(60)의 외측면과 상기 EGR파이프의 단부 사이에 끼워지도록 구성될 수 있다.On the other hand, as shown in Figure 4, as shown in Figure 4, one side is formed somewhat larger than the diameter of the circular opening, when the catalyst filter 65 is inserted into the circular opening, the guide portion ( One side of 70 may be configured to fit between an outer surface of the flange 60 and an end of the EGR pipe.

이와 같이 장착된 상기 촉매필터(65)는 상기 슈트(SOOT)를 산화시키기 위하여 상기 EGR쿨러(55) 내부에 구비된 PM필터의 작용을 촉진함으로써, 상기 슈트(SOOT)의 완전한 산화를 가능하게 하며, 이로써 상기 EGR쿨러(55)의 효율을 높일 수 있게 된다. The catalyst filter 65 mounted as described above promotes the action of the PM filter provided in the EGR cooler 55 to oxidize the chute, thereby enabling complete oxidation of the chute. As a result, the efficiency of the EGR cooler 55 can be increased.

본 발명에 따른 촉매필터가 적용된 이지알 쿨러는, EGR파이프와 연결되는 양단부에 촉매필터를 추가적으로 적용함으로써, EGR쿨러 내부에서 슈트(SOOT)를 산화시키는 역할을 담당하는 PM필터의 상기 슈트(SOOT)에 대한 산화작용을 촉진시킴으로써, 상기 EGR쿨러의 효율을 증진시키는 이점이 있다.In the EG cooler to which the catalyst filter according to the present invention is applied, by additionally applying a catalyst filter to both ends connected to the EGR pipe, the chute of the PM filter serving to oxidize the SOOT inside the EGR cooler By promoting the oxidation to the, there is an advantage to enhance the efficiency of the EGR cooler.

Claims (4)

양단부에 형성된 플랜지에 각각 EGR파이프가 연결되는 이지알 쿨러에 있어서,In the EG cooler, the EGR pipe is connected to the flange formed on both ends, EGR파이프와 상기 EGR쿨러 내부가 서로 연통되도록 중간부분에 원형개구부가 형성된 플랜지에 상기 EGR쿨러의 내부에 구비된 PM필터의 슈트(SOOT)에 대한 산화를 촉진시키는 촉매필터가 삽입 장착된 것을 특징으로 하는 촉매필터가 적용된 이지알 쿨러. A catalyst filter for promoting oxidation of the SOOT of the PM filter provided inside the EGR cooler is inserted into a flange having a circular opening at an intermediate portion such that the EGR pipe and the inside of the EGR cooler communicate with each other. Easy cooler with catalytic filter. 제 1 항에 있어서,The method of claim 1, 상기 촉매필터는, 상기 플랜지의 원형개구부에 삽입 장착되도록 상기 원형개구부의 직경에 대응되는 크기로 형성된 것을 특징으로 하는 촉매필터가 적용된 이지알 쿨러.The catalyst filter is an EG cooler to which the catalyst filter is applied, characterized in that formed in a size corresponding to the diameter of the circular opening to be inserted into the circular opening of the flange. 제 2 항에 있어서,The method of claim 2, 상기 촉매필터의 외주면에는 고무재질의 가이드부가 구비된 것을 특징으로 하는 촉매필터가 적용된 이지알 쿨러.The EG cooler to which the catalyst filter is applied, characterized in that the guide portion of the rubber material is provided on the outer peripheral surface of the catalyst filter. 제 3 항에 있어서,The method of claim 3, wherein 상기 가이드부는, The guide unit, 일측이 상기 원형개구부의 직경보다 다소 크게 형성되어, 상기 촉매필터가 상기 원형개구부에 삽입 장착될 때, 상기 플랜지의 일측면과 상기 EGR파이프의 단부에 끼워지도록 구성된 것을 특징으로 하는 촉매필터가 적용된 이지알 쿨러.One side is formed somewhat larger than the diameter of the circular opening, when the catalyst filter is inserted into the circular opening, the catalyst filter is characterized in that it is configured to be fitted to one side of the flange and the end of the EGR pipe. Al cooler.
KR1020060119916A 2006-11-30 2006-11-30 A egr cooler inserting a catalytic filter KR20080049401A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101314391B1 (en) * 2012-05-16 2013-10-04 현대위아 주식회사 Exhaust gas recirculation system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101314391B1 (en) * 2012-05-16 2013-10-04 현대위아 주식회사 Exhaust gas recirculation system

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