KR20110062066A - Muti function exhaust gas recirculation apparatus - Google Patents

Muti function exhaust gas recirculation apparatus Download PDF

Info

Publication number
KR20110062066A
KR20110062066A KR1020090118647A KR20090118647A KR20110062066A KR 20110062066 A KR20110062066 A KR 20110062066A KR 1020090118647 A KR1020090118647 A KR 1020090118647A KR 20090118647 A KR20090118647 A KR 20090118647A KR 20110062066 A KR20110062066 A KR 20110062066A
Authority
KR
South Korea
Prior art keywords
exhaust gas
oxidation catalyst
egr
line
catalyst
Prior art date
Application number
KR1020090118647A
Other languages
Korean (ko)
Other versions
KR101199121B1 (en
Inventor
서정민
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 KR1020090118647A priority Critical patent/KR101199121B1/en
Publication of KR20110062066A publication Critical patent/KR20110062066A/en
Application granted granted Critical
Publication of KR101199121B1 publication Critical patent/KR101199121B1/en

Links

Images

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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • 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
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • 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
    • 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

Abstract

PURPOSE: A multifunctional exhaust gas recirculation apparatus is provided to improve purification efficiency by inserting a composite oxidation catalyst between the rear end of a DPF and an LP-EGR. CONSTITUTION: A multifunctional exhaust gas recirculation apparatus comprises an exhaust line and an Exhaust Gas Recirculation line(22). The exhaust line is located at the rear end of a diesel oxidation catalyst(11) for purifying exhaust gas and positions a selective reduction catalyst(15) at the rear end of a composite oxidation catalyst(13). The EGR line is branched between the composite oxidation catalyst and the selective reduction catalyst and is connected to an external line connected to the compressor of a turbo charger(2). An EGR cooler(21) is installed in the EGR line.

Description

다기능 배기가스재순환장치{Muti function exhaust gas recirculation apparatus} Multi-function exhaust gas recirculation apparatus

본 발명은 배기가스재순환장치에 관한 것으로, 특히 저압하에 작동되면서 촉매 재생기능등을 함께 구현하는 다기능 배기가스재순환장치에 관한 것이다.The present invention relates to an exhaust gas recirculation apparatus, and more particularly, to a multi-functional exhaust gas recirculation apparatus that performs a catalyst regeneration function while operating under low pressure.

일반적으로 디젤차량 배기계에 적용된 매연여과필터(DPF: Diesel Particulate Filter)는 매연(PM: Particular Matter)을 포집하고, 일정량 퇴적 후 후분사를 통해 배기온 상승시켜 퇴적된 매연을 연소시키는 장치이다.In general, a diesel particulate filter (DPF) applied to a diesel vehicle exhaust system collects soot (PM: Particular Matter), and is a device that burns the accumulated soot by raising the exhaust temperature through post injection after a certain amount of deposition.

상기와 같은 매연여과필터인 DPF는 재생가능한 필터로서, 이를 위해 엔진에서 고온배기가스를 후분사하여 달라붙은 매연과 같은 오염을 태워주는 재생장치와 함께 배기계를 구성한다.DPF, a soot filtration filter as described above, constitutes an exhaust system together with a regeneration device that burns pollution such as soot that is stuck by post-injection of hot exhaust gas from an engine.

하지만, DPF재생시 구현되는 후분사를 통해 추가적으로 연료를 다량 연소함으로써, DPF 후단에서의 CO량 및 HC량에 영향을 미칠 수밖에 없어 재생주기에 대한 제한요인들을 적용하게 된다.However, by additionally burning a large amount of fuel through post-injection implemented during the regeneration of the DPF, it is inevitable to affect the amount of CO and HC at the rear end of the DPF, thereby applying limitations on the regeneration cycle.

상기와 같은 DPF 취약성을 보강하기 위해 다양한 장치들을 각각 개별적으로 적용하며, 일례로 선택저감촉매(SCR: Selective Catalyst Reduction)를 DPF의 후단 쪽으로 구성한다.Various devices are individually applied to reinforce the above-mentioned DPF vulnerability, and for example, a selective catalyst reduction (SCR) is configured toward the rear end of the DPF.

하지만, DPF에 쌓인 슈트(Soot)는 NO2 반응에 의해 자연재생되는 특성이 있으므로, 상기 SCR은 NO/NO2의 최적비율(1:1)을 맞추기 어려운점이 있다. However, since the Soot accumulated in the DPF has a characteristic of being naturally regenerated by the NO 2 reaction, the SCR has difficulty in matching the optimum ratio of NO / NO 2 (1: 1).

또한, 디젤엔진에는 터보챠저를 구동하고 배기가스를 재순환하기 위한 배기가스재순환장치(EGR, Exhaust Gas Recirculation)르 적용하며, 통상 DPF를 갖춘 배기계와 연관되도록 구성한다.In addition, an exhaust gas recirculation device (EGR) for driving a turbocharger and recycling exhaust gas is applied to a diesel engine, and is generally configured to be associated with an exhaust system having a DPF.

하지만 디젤엔진개발이 발전됨으로써, 고효율 터보챠저 및 고부하 영역의 추가적인 배기가스재순환장치인 EGR을 필요로 하고 이를 위해 저압EGR인 LP-EGR(Low Pressure EGR)을 적용한다.However, with the development of diesel engines, high-efficiency turbochargers and additional exhaust gas recirculation equipment in high load areas are required, and low pressure EGR, LP-EGR (Low Pressure EGR) is applied.

상기 LP-EGR은 보다 큰 압력차이를 이용하고 EGR를 흡기매니폴드 보다 이전인 터보 차저의 컴프레서 전단에 유입시키는 방식으로, 발전된 엔진성능을 따라가지 못하는 고압EGR인 HP-EGR(High pressure EGR)을 보강하기 위한 방식이다.The LP-EGR utilizes a larger pressure difference and injects EGR into the compressor front end of the turbocharger before the intake manifold, and thus, HP-EGR (High pressure EGR), which does not keep up with the advanced engine performance, is used. It is a way to reinforce.

상기와 같은 LP-EGR은 긴 EGR통로로 다소 느린 동적거동을 갖지만, 슈트(Soot)를 제거한 배기가스와 공기가 엔진유입전 혼합되어 향상된 기통당 분배성을 갖고, DPF 후단과 컴프레서 흡기의 부압차이를 이용하여 고부하 영역에서의 EGR 유량 증대가 용이하다.The LP-EGR has a rather slow dynamic behavior due to the long EGR path, but the exhaust gas and the air from which the chute is removed are mixed before the engine inflow, so that the LP-EGR has better distribution per cylinder, and the negative pressure difference between the rear end of the DPF and the compressor intake. It is easy to increase the EGR flow rate in the high load region by using.

하지만, 상기 LP-EGR은 DPF 후단에 형성된 EGR경로로 인해 비정상 제어시 DPF에서 떨어진 입자부스러기의 엔진유입경향을 가지므로, DPF 후단과 EGR경로사이로 이머전시 필터(Emergency Filter 또는 Second Filter)의 설치를 필요로 한다.However, since the LP-EGR has an engine inflow tendency of the particle debris dropped from the DPF during abnormal control due to the EGR path formed at the rear end of the DPF, an emergency filter (Emergency Filter or Second Filter) is installed between the rear end of the DPF and the EGR path. in need.

이와 같이 디젤엔진차량은 엔진성능이 더욱 발전하고 질소산화물에 대한 정 화성능을 더 높게 요구함으로써, 배기계와 EGR 구성을 더욱 복잡하고 다단으로 구성해야하지만, 그 성능향상은 충분히 만족스럽지 못한 측면이 있게 된다.As such, diesel engine vehicles require more advanced engine performance and higher purification performance for nitrogen oxides, so that the exhaust system and the EGR configuration should be more complicated and multistage, but the performance improvement is not satisfactory enough. do.

이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, DPF 재생시 후단부위에서 질소산화물(NOx) 정화성능을 높이면서도 배기라인에서 분기된 LP-EGR(Low Pressure EGR)쪽에 대한 DPF 입자부스러기의 엔진유입현상을 근본적으로 차단할 수 있는 다기능 배기가스순환장치를 제공함에 목적이 있다.Accordingly, the present invention has been invented in view of the above, and the DPF particle crumb for LP-EGR (Low Pressure EGR) branched from the exhaust line while improving the NOx purification performance at the rear end during DPF regeneration. An object of the present invention is to provide a multi-functional exhaust gas circulation system that can fundamentally block the engine inflow phenomenon.

또한, 본 발명은 DPF후단과 LP-EGR(Low Pressure EGR)사이에서 복합산화촉매를 이용함으로써, 질소산화물제거를 위해 코팅되는 귀금속량을 줄일 수 있어 촉매필터비용을 절감할 수 있는 다기능 배기가스순환장치를 제공함에 목적이 있다.In addition, the present invention by using a complex oxidation catalyst between the rear end of the DPF and LP-EGR (Low Pressure EGR), it is possible to reduce the amount of precious metal to be coated for the removal of nitrogen oxides multi-functional exhaust gas circulation can reduce the catalyst filter cost It is an object to provide a device.

상기와 같은 목적을 달성하기 위한 본 발명은, 배기가스재순환장치가 배기가스를 정화하는 디젤산화촉매의 후단으로 위치되어 오염물질을 정화하는 복합산화촉매와, NO를 NO2로 산화시키는 선택저감촉매를 상기 복합산화촉매의 후단으로 위치시킨 배기라인과; The present invention for achieving the above object, the exhaust gas recirculation device is located in the rear end of the diesel oxidation catalyst for purifying the exhaust gas complex oxidation catalyst for purifying pollutants, and selective reduction catalyst for oxidizing NO to NO2 An exhaust line positioned at a rear end of the complex oxidation catalyst;

상기 복합산화촉매와 선택저감촉매사이에서 분기되어 터보차져의 컴프레서쪽으로 이어진 외기라인에 연결되고, EGR쿨러를 설치한 EGR라인;An EGR line branched between the complex oxidation catalyst and the selective reduction catalyst, connected to an outside air line leading to the compressor of the turbocharger, and installed with an EGR cooler;

을 포함해 구성된 것을 특징으로 한다.Characterized in that configured to include.

상기 복합산화촉매와 선택저감촉매사이를 잇는 배기라인에 복합제어밸브가 설치되고, 상기 복합제어밸브의 앞쪽에 상기 EGR라인을 분기시킨 것을 특징으로 한다. A composite control valve is installed in an exhaust line between the composite oxidation catalyst and the selective reduction catalyst, and the EGR line is branched to the front of the composite control valve.

상기 디젤산화촉매와 복합산화촉매사이로 매연여과필터를 더 구비한다. A soot filtration filter is further provided between the diesel oxidation catalyst and the composite oxidation catalyst.

상기 복합산화촉매는 백금(Pd)촉매이고, 슬라이스(Slice)담체나 세라믹 또는 금속담체이다. The complex oxidation catalyst is a platinum (Pd) catalyst and is a slice carrier, ceramic or metal carrier.

상기 담체는 고밀도담체를 적용한다.The carrier applies a high density carrier.

이러한 본 발명에 의하면, DPF후단과 LP-EGR사이에서 코팅 귀금속량을 줄인 복합산화촉매를 개재하여 비용을 상승시키지 않고 정화효율도 높이는 효과를 갖는다.According to the present invention, there is an effect of increasing the purification efficiency without increasing the cost through the complex oxidation catalyst reducing the amount of coating precious metal between the rear end of the DPF and LP-EGR.

또한, DPF후단과 LP-EGR사이에서 위치된 복합산화촉매가 LP-EGR를 통해 엔진으로 유입될 수 있는 DPF 입자부스러기를 걸러주므로, 이머전시(세컨드)필터를 제거하고 LP-EGR의 장점만을 이용하는 효과도 갖는다.In addition, the complex oxidation catalyst located between the rear end of the DPF and the LP-EGR filters out the DPF particle debris that can enter the engine through the LP-EGR, thus eliminating the emergency (second) filter and using only the advantages of the LP-EGR. It also has an effect.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명하며, 이러한 실시예는 일례로서 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 여러 가지 상이한 형태로 구현될 수 있으므로, 여기에서 설명하는 실시예에 한정되지 않는다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

도 1은 본 발명에 따른 다기능 배기가스재순환장치의 구성도를 도시한 것인바, 본 발명의 배기가스재순환장치는 배기가스를 배출하는 배기라인(7)에 설치된 촉매필터로 이루어진 배기가스정화기(10)와, 상기 배기가스정화기(10)를 거친 배기가스를 터보차져(2)쪽으로 공급해 흡기라인(3)으로 유입되는 외기를 압축해 엔진(1)으로 보내는 배기가스재순환기(20)를 포함해 구성한다.1 is a block diagram of a multi-functional exhaust gas recirculation apparatus according to the present invention, the exhaust gas recirculation apparatus of the present invention is an exhaust gas purifier 10 composed of a catalyst filter installed in the exhaust line 7 for discharging the exhaust gas. ) And an exhaust gas recirculator 20 for supplying the exhaust gas passed through the exhaust gas purifier 10 to the turbocharger 2, compressing the outside air flowing into the intake line 3, and sending the exhaust gas to the engine 1. Configure.

상기 흡기라인(3)은 터보차져(2)쪽으로 이어진 외기라인(4)과, 엔진(1)의 전단에서 설치된 인터쿨러(6)를 갖추고 터보차져(2)의 컴프레서쪽에서 인출되어 엔진(1)쪽으로 인어진 흡기연결라인(5)으로 구성한다.The intake line 3 has an outside air line 4 extending to the turbocharger 2 and an intercooler 6 installed at the front end of the engine 1 and is drawn out from the compressor side of the turbocharger 2 toward the engine 1. It consists of the drawn intake connection line (5).

상기 배기라인(7)은 엔진(1)에서 인출되어 터보차져(2)의 터빈을 거쳐 소음기쪽으로 이어진다. The exhaust line 7 is withdrawn from the engine 1 and passes through the turbine of the turbocharger 2 towards the silencer.

본 실시예에 따른 상기 배기가스정화기(10)는 엔진(1)에서 터보차져(2)의 터빈을 거친 배기라인(7)을 갖추고, 상기 배기라인(7)을 따라 디젤산화촉매(11,DOC)와, 매연여과필터(12,DPF)와, 복합산화촉매(13,MOC) 및 선택저감촉매(15,SCR)가 순차적으로 설치된다.The exhaust gas purifier 10 according to the present embodiment includes an exhaust line 7 passing through a turbine of the turbocharger 2 from the engine 1, and a diesel oxidation catalyst 11 and DOC along the exhaust line 7. ), A soot filtration filter 12 (DPF), a combined oxidation catalyst (13, MOC) and a selective reduction catalyst (15, SCR) are sequentially installed.

여기서, DOC는 Diesel Oxidation Catalyst이고, DPF는 Diesel Particulate Filter이며, MOC는 Multi Oxidation Catalyst)이고, SCR은 Selective Catalyst Reduction를 의미한다.Here, DOC is Diesel Oxidation Catalyst, DPF is Diesel Particulate Filter, MOC is Multi Oxidation Catalyst), and SCR means Selective Catalyst Reduction.

상기 복합산화촉매(13)는 다양한 구조를 갖추는데, 일례로 DFP 재생시 고온노출에 유리한 백금(Pd)촉매를 적용해, NOx에 의한 불리한 상황을 방지한다.The complex oxidation catalyst 13 has a variety of structures, for example, by applying a platinum (Pd) catalyst, which is advantageous for high temperature exposure during DFP regeneration, to prevent the adverse situation caused by NOx.

또한, 상기 복합산화촉매(13)는 배압을 고려해 슬라이스(Slice)담체나 내열성을 고려해 세라믹 또는 금속담체로 적용하거나, DPF 손상시 입자(Particle)포집기능을 위해 촉매표면적을 확보할 수 있는 고밀도담체를 적용한다.In addition, the complex oxidation catalyst 13 may be applied as a ceramic or metal carrier in consideration of a back pressure and a slice carrier or heat resistance, or a high density carrier capable of securing a catalyst surface area for a particle collection function in case of DPF damage. Apply.

상기 복합산화촉매(13,MOC)와 선택저감촉매(15,SCR)사이를 잇는 배기라인(7)에는 복합제어밸브(14)가 설치되며, 상기 복합제어밸브(14)는 복합산화촉매(13,MOC)를 나온 배기가스를 선택저감촉매(15,SCR)쪽으로 보내지 않고 터보차져(2)쪽으로 우회(Bypass)시키는 작용을 한다.A composite control valve 14 is installed in the exhaust line 7 between the composite oxidation catalyst 13 and the MOC and the selective reduction catalyst 15 and SCR, and the composite control valve 14 is a composite oxidation catalyst 13. , Bypasses the exhaust gas from the MOC to the selective reduction catalyst (15, SCR) and bypasses the turbocharger (2).

본 실시예에 따른 상기 배기가스재순환기(20)는 보다 큰 압력차이를 이용하고 EGR를 흡기매니폴드보다 이전인 터보차져(2)의 컴프레서 전단으로 가스를 유입시키는 저압EGR인 LP-EGR(Low Pressure EGR)방식의 장점을 취하도록 구성된다.The exhaust gas recirculator 20 according to the present embodiment uses a larger pressure difference and LP-EGR (Low), which is a low pressure EGR that introduces gas to the compressor front end of the turbocharger 2 having an EGR before the intake manifold. Pressure EGR).

상기 배기가스재순환기(20)는 EGR쿨러(21)를 구비하고, 배기라인(7)에서 분기되어 터보차져(2)쪽으로 이어진 외기라인(4)에 연결된 EGR라인(22)과, EGR밸브(24)를 갖추고 엔진(1)으로 이어진 흡기연결라인(5)에서 분기되어 배기라인(7)에 연결된 바이패스라인(23)으로 구성한다.The exhaust gas recirculator 20 includes an EGR cooler 21, an EGR line 22 connected to an outside air line 4 branched from the exhaust line 7 and connected to the turbocharger 2, and an EGR valve ( And a bypass line 23 branched from the intake connection line 5 leading to the engine 1 and connected to the exhaust line 7.

본 실시예에서 상기 EGR라인(22)은 복합산화촉매(13,MOC)와 복합제어밸 브(14)사이를 잇는 배기라인(7)쪽에서 분기되며, 상기 복합제어밸브(14)의 작동상태에 따라 복합산화촉매(13,MOC)를 나온 배기가스를 선택저감촉매(15,SCR)쪽으로 보내지 않고 터보차져(2)쪽으로 우회(Bypass)될 수 있게 된다.In the present embodiment, the EGR line 22 is branched from the side of the exhaust line 7 between the complex oxidation catalyst 13 and the MOC and the composite control valve 14, and the operating state of the composite control valve 14 Accordingly, the exhaust gas from the complex oxidation catalyst 13 (MOC) can be bypassed to the turbocharger 2 without being sent to the selective reduction catalyst 15 and SCR.

상기와 같은 EGR라인(22)의 구조를 갖춤으로써, 보다 큰 압력차이를 이용할 수 있는 저압EGR인 LP-EGR(Low Pressure EGR)방식의 장점을 취하게 된다.By having the structure of the EGR line 22 as described above, it takes advantage of the LP-EGR (Low Pressure EGR) method of low pressure EGR that can use a larger pressure difference.

도 2는 본 실시예에 따른 배기가스정화기(10)와 배기가스재순환기(20)의 작동을 나타낸다.2 shows the operation of the exhaust gas purifier 10 and the exhaust gas recirculator 20 according to the present embodiment.

도를 참조로 배기가스재순환기(20)가 작동하지 않는 상태에서 배기가스정화기(10)의 작동을 설명하면, 엔진(1)에서 배출되어 배기라인(7)을 따라 배기가스정화기(10)로 배기가스가 유입되면, 배기가스는 배기라인(7)의 최선단에 설치된 디젤산화촉매(11)와 매연여과필터(12)를 거쳐 매연물질이 정화된 후, 이어진 복합산화촉매(13)를 지나 선택저감촉매(15)쪽으로 배출된다.Referring to the operation of the exhaust gas purifier 10 in a state where the exhaust gas recirculator 20 does not operate, referring to the exhaust gas from the engine 1 to the exhaust gas purifier 10 along the exhaust line (7) When the exhaust gas flows in, the exhaust gas passes through the diesel oxidation catalyst 11 and the soot filtration filter 12 installed at the uppermost end of the exhaust line 7, and after the exhaust material is purified, it passes through the subsequent combined oxidation catalyst 13. It is discharged toward the selective reducing catalyst 15.

이때, 상기 복합제어밸브(14)는 복합산화촉매(13)와 선택저감촉매(15)사이를 잇는 배기라인(7)으로 배기가스흐름을 형성한다.At this time, the composite control valve 14 forms an exhaust gas flow through the exhaust line 7 between the complex oxidation catalyst 13 and the selective reduction catalyst 15.

본 실시예에서 상기 디젤산화촉매(11)와 매연여과필터(12) 및 선택저감촉매(15)는 각각 고유특성을 이용해 오염물질을 저감하지만, 복합산화촉매(13)에서는 오염물질정화를 위한 다양한 작용이 구현된다.In the present embodiment, the diesel oxidation catalyst 11, the soot filtration filter 12 and the selective reducing catalyst 15 reduce pollutants by using intrinsic properties, respectively, but in the complex oxidation catalyst 13, The action is implemented.

즉, 상기 복합산화촉매(13)에서는 오염물질은 물론 DFP 재생시 발생하는 HC와 CO에 대한 높은 정화작용을 구현하고, 특히 NOx를 발생하는 850도 이상 고온노출에서도 유리한 백금(Pd)촉매를 적용함으로써, 후단에 설치된 선택저감촉매(15)가 NOx 퇴적으로 NOx정화기능을 약화시키는 현상을 억제하게 된다.That is, the complex oxidation catalyst 13 implements a high purification effect for HC and CO generated during regeneration of DFP as well as pollutants, and particularly, applies a platinum (Pd) catalyst which is advantageous even at high temperature exposure of more than 850 degrees that generates NOx. This suppresses the phenomenon that the selective reduction catalyst 15 provided in the rear stage weakens the NOx purification function by the NOx deposition.

또한, 상기 복합산화촉매(13)는 DPF에서 배출된 NO를 NO2 변환시켜줌으로써, 후단에 설치된 선택저감촉매(15)가 NOx 저감율을 더욱 향상시켜준다. In addition, the composite oxidation catalyst 13 converts NO discharged from the DPF to NO 2, so that the selective reduction catalyst 15 installed at the rear stage further improves the NOx reduction rate.

이와 더불어 상기 복합산화촉매(13)는 촉매표면적을 확보한 고밀도담체를 적용함으로써, DPF 재생에 따른 손상시 입자(Particle)포집기능도 더욱 향상시켜준다. In addition, the composite oxidation catalyst 13 further improves the particle capture function upon damage due to DPF regeneration by applying a high density carrier having a catalyst surface area.

또한, 상기 복합산화촉매(13)는 DPF 재생시 비정상 제어상태에서 발생될 수 있는 손상으로 인한 DPF의 입자(Particle)를 걸러줌으로써, DPF입자의 엔진유입방지를 위한 별도의 이머전시(세컨더리)필터를 적용하지 않고서 동일한 효과를 나타낼 수 있게 된다.In addition, the composite oxidation catalyst 13 filters the particles of the DPF due to damage that may occur in an abnormal control state during the regeneration of the DPF, thereby providing a separate emergency (secondary) filter for preventing engine inflow of the DPF particles. The same effect can be achieved without applying.

본 실시예에서는 상기와 같은 작용을 구현하는 복합산화촉매(13)가 저압EGR인 LP-EGR(Low Pressure EGR)방식의 배기가스재순환기(20)가 갖는 EGR경로에 설치됨으로써, 상대적으로 더 낮은 EGR압력을 이용할 수 있도록 한다.In this embodiment, the composite oxidation catalyst 13 implementing the above-described action is installed in the EGR path of the low pressure EGR exhaust gas recirculator 20 of LP-EGR. Make the EGR pressure available.

도 2에서 LP-EGR(Low Pressure EGR)방식의 배기가스재순환기(20)에서 구현되는 작동을 설명하면, 배기가스재순환기(20)의 작용은 복합산화촉매(13)와 선택저감촉매(15)사이로 설치된 복합제어밸브(14)를 전환해 복합산화촉매(13)를 나온 배기가스를 터보차져(2)쪽으로 우회(Bypass)시키게 된다.Referring to the operation implemented in the exhaust gas recirculator 20 of LP-EGR (Low Pressure EGR) method in Figure 2, the action of the exhaust gas recirculator 20 is a complex oxidation catalyst 13 and a selective low catalyst (15) The exhaust gas from the combined oxidation catalyst 13 is diverted to the turbocharger 2 by switching between the combined control valves 14 installed therebetween.

즉, 복합제어밸브(14)의 전환으로 복합산화촉매(13)를 나온 배기가스가 EGR라인(22)으로 우회되면, 배기가스인 EGR가스는 EGR쿨러(21)를 지나 터보차져(2)의 컴프레서쪽으로 공급된다.That is, when the exhaust gas exiting the complex oxidation catalyst 13 is diverted to the EGR line 22 by the switching of the complex control valve 14, the EGR gas, which is the exhaust gas, passes through the EGR cooler 21 to the turbocharger 2. Supply to the compressor.

본 실시예에서는 EGR라인(22)이 터보차져(2)의 컴프레서쪽으로 연결된 외기라인(4)과 합쳐짐으로써, EGR가스가 터보차져(2)의 컴프레서쪽 전단에서 외기와 함께 공급된다.In this embodiment, the EGR line 22 is combined with the outside air line 4 connected to the compressor side of the turbocharger 2 so that the EGR gas is supplied together with the outside air at the front end of the compressor side of the turbocharger 2.

이와 같이 EGR가스가 공급되므로 보다 큰 압력차이를 이용하고, 흡기매니폴드보다 이전인 터보차져(2)쪽으로 공급하는 저압EGR인 LP-EGR(Low Pressure EGR)방식을 구현한다.Since the EGR gas is supplied in this way, a larger pressure difference is used, and LP-EGR (Low Pressure EGR), which is a low pressure EGR, is supplied to the turbocharger 2 before the intake manifold.

본 실시예에서는 EGR라인(22)이 디젤산화촉매(11)의 후단에 위치된 복합산화촉매(13)에서 분기됨으로써, 디젤산화촉매(11)쪽에서 분기되는 기존방식에 비해 더 낮은 압력의 저압 EGR을 구현할 수 있어 엔진(1)의 NOx 발생율도 개선될 수 있다.In this embodiment, the EGR line 22 is branched from the complex oxidation catalyst 13 located at the rear end of the diesel oxidation catalyst 11, thereby lowering the low pressure EGR at a lower pressure than the conventional method of branching from the diesel oxidation catalyst 11 side. It can be implemented to improve the NOx generation rate of the engine (1).

상기와 같이 복합산화촉매(13)를 거쳐 더욱 정화된 상태의 배기가스를 EGR가스로 이용함으로써, EGR 경로오염도 줄일 수 있게 된다.As described above, by using the exhaust gas further purified through the complex oxidation catalyst 13 as the EGR gas, the EGR path contamination can be reduced.

도 1은 본 발명에 따라 배기계와 함께 구성된 다기능 배기가스재순환장치의 구성도1 is a block diagram of a multi-functional exhaust gas recirculation apparatus configured with an exhaust system according to the present invention

도 2는 본 발명에 따른 배기계의 배기가스정화작동 및 LP-EGR 작동도Figure 2 is an exhaust gas purification operation and LP-EGR operation of the exhaust system according to the present invention

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

1 : 엔진 2 : 터보차져1: engine 2: turbocharger

3 : 흡기라인 4 : 외기라인3: intake line 4: outside air line

5 : 흡기연결라인 6 : 인터쿨러5: intake connection line 6: intercooler

7 : 배기라인 10 : 배기계7 exhaust line 10 exhaust system

11 : 디젤산화촉매(DOC: Diesel Oxidation Catalyst)11: Diesel Oxidation Catalyst (DOC)

12 : 매연여과필터(DPF: Diesel Particulate Filter)12: Diesel Particulate Filter (DPF)

13 : 복합산화촉매(MOC: Multi Oxidation Catalyst)13: Multi Oxidation Catalyst (MOC)

14 : 복합제어밸브14: combined control valve

15 : 선택저감촉매(SCR: Selective Catalyst Reduction)15: Selective Catalyst Reduction (SCR)

20 : 배기가스재순환기 21 : EGR쿨러20: exhaust gas recirculator 21: EGR cooler

22 : EGR라인 23 : 바이패스라인22: EGR line 23: bypass line

24 : EGR밸브 24: EGR valve

Claims (6)

배기가스를 정화하는 디젤산화촉매의 후단으로 위치되어 오염물질을 정화하는 복합산화촉매와, NO를 NO2로 산화시키는 선택저감촉매를 상기 복합산화촉매의 후단으로 위치시킨 배기라인과, An exhaust line having a complex oxidation catalyst positioned at a rear end of the diesel oxidation catalyst for purifying exhaust gas and purifying contaminants, and a selective reduction catalyst for oxidizing NO to NO 2 at the rear end of the complex oxidation catalyst; 상기 복합산화촉매와 선택저감촉매사이에서 분기되어 터보차져의 컴프레서쪽으로 이어진 외기라인에 연결되고, EGR쿨러를 설치한 EGR라인을 포함해 구성된 것을 특징으로 하는 다기능 배기가스재순환장치.And an EGR line branched between the complex oxidation catalyst and the selective reduction catalyst, connected to an outside air line leading to the compressor of the turbocharger, and equipped with an EGR cooler. 청구항 1에 있어서, 상기 복합산화촉매와 선택저감촉매사이를 잇는 배기라인에 복합제어밸브가 설치되고, 상기 복합제어밸브의 앞쪽에 상기 EGR라인을 분기시킨 것을 특징으로 하는 다기능 배기가스재순환장치. The multifunctional exhaust gas recirculation apparatus according to claim 1, wherein a composite control valve is provided in an exhaust line between the composite oxidation catalyst and the selective reduction catalyst, and the EGR line is branched in front of the composite control valve. 청구항 1에 있어서, 상기 디젤산화촉매와 복합산화촉매사이로 매연여과필터를 더 구비한 것을 특징으로 하는 다기능 배기가스재순환장치. The multifunctional exhaust gas recirculation apparatus of claim 1, further comprising a soot filtration filter between the diesel oxidation catalyst and the composite oxidation catalyst. 청구항 1에 있어서, 상기 복합산화촉매는 백금(Pd)촉매인 것을 특징으로 하 는 다기능 배기가스재순환장치. The multifunctional exhaust gas recirculation apparatus of claim 1, wherein the complex oxidation catalyst is a platinum (Pd) catalyst. 청구항 4에 있어서, 상기 복합산화촉매는 슬라이스(Slice)담체나 세라믹 또는 금속담체인 것을 특징으로 하는 다기능 배기가스재순환장치. The multifunctional exhaust gas recirculation apparatus of claim 4, wherein the complex oxidation catalyst is a slice carrier, a ceramic or a metal carrier. 청구항 5에 있어서, 상기 담체는 고밀도담체인 것을 특징으로 하는 다기능 배기가스재순환장치. The multifunctional exhaust gas recirculation apparatus according to claim 5, wherein the carrier is a high density carrier.
KR1020090118647A 2009-12-02 2009-12-02 Muti function exhaust gas recirculation apparatus KR101199121B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090118647A KR101199121B1 (en) 2009-12-02 2009-12-02 Muti function exhaust gas recirculation apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090118647A KR101199121B1 (en) 2009-12-02 2009-12-02 Muti function exhaust gas recirculation apparatus

Publications (2)

Publication Number Publication Date
KR20110062066A true KR20110062066A (en) 2011-06-10
KR101199121B1 KR101199121B1 (en) 2012-11-09

Family

ID=44396317

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020090118647A KR101199121B1 (en) 2009-12-02 2009-12-02 Muti function exhaust gas recirculation apparatus

Country Status (1)

Country Link
KR (1) KR101199121B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2826974A4 (en) * 2012-03-13 2015-11-11 Isuzu Motors Ltd Exhaust gas purification device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2894623B1 (en) * 2005-12-08 2008-02-01 Renault Sas METHOD FOR CONTROLLING AN ENGINE COMPRISING A LOW PRESSURE TYPE EXHAUST GAS RECIRCULATION LOOP
JP5266865B2 (en) * 2008-05-13 2013-08-21 いすゞ自動車株式会社 Exhaust gas purification system and control method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2826974A4 (en) * 2012-03-13 2015-11-11 Isuzu Motors Ltd Exhaust gas purification device

Also Published As

Publication number Publication date
KR101199121B1 (en) 2012-11-09

Similar Documents

Publication Publication Date Title
JP4089396B2 (en) EGR system for internal combustion engine with turbocharger
JP4792997B2 (en) Exhaust gas purification system for internal combustion engine
JP5763294B2 (en) Exhaust purification equipment
US20070044460A1 (en) Electrical diesel particulate filter (DPF) regeneration
WO2007046518A1 (en) Exhaust gas purifier for diesel engine
JP2005090509A (en) Turbo charged internal combustion engine using egr flow
JP2006233803A (en) Internal combustion engine having supercharger with electric motor
US20110225969A1 (en) Compressor bypass to exhaust for particulate trap regeneration
JP2007023791A (en) Exhaust emission control device of internal combustion engine
KR102540442B1 (en) System of forcibly regenerating gasoline particulate filter
JP2020506330A (en) Two-stage internal combustion engine aftertreatment system using a common radiator cooling fluid circuit for exhaust gas intercooling and charger driven injection systems
US20100071365A1 (en) Exhaust gas recirculation system
US20110167804A1 (en) Engine Exhaust System and Method of Operation
CN101586489B (en) Fresh air bypass to cool down hot exhaust in dpf regeneration mode
KR20170119843A (en) Exhaust gas recirculation apparatus
JP2007263033A (en) Engine with supercharger
KR100999646B1 (en) Exhaust gas recirculation system
CN111894766A (en) Vehicle system with low-pressure EGR loop
KR101199121B1 (en) Muti function exhaust gas recirculation apparatus
JP2006046252A (en) Exhaust emission control method and engine provided with exhaust emission control device
JP2005299628A (en) Filter regeneration control device for diesel engine
JP6213260B2 (en) Exhaust gas purification system and control method thereof
JP2007192153A (en) Egr device
KR101405752B1 (en) Particulate matters cleaning device for exhaust gas recirculation
JP4400194B2 (en) Diesel engine exhaust purification system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20171030

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20181030

Year of fee payment: 7