KR102179102B1 - Heat recovery apparatus of exhaust gas - Google Patents

Heat recovery apparatus of exhaust gas Download PDF

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KR102179102B1
KR102179102B1 KR1020150140161A KR20150140161A KR102179102B1 KR 102179102 B1 KR102179102 B1 KR 102179102B1 KR 1020150140161 A KR1020150140161 A KR 1020150140161A KR 20150140161 A KR20150140161 A KR 20150140161A KR 102179102 B1 KR102179102 B1 KR 102179102B1
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exhaust gas
heat recovery
engine
dpf
exhaust
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KR1020150140161A
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Korean (ko)
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KR20170041300A (en
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박전진
장경익
김성수
이준명
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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
    • F02M26/13—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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • 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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • 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
    • 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
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • 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
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • 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
    • Y02T10/40—Engine management systems

Abstract

배기가스의 정화를 위해 엔진의 배기측에 설치되는 DPF; 상기 DPF 후단에 마련되어 배기가스를 재순환시키도록 마련된 LP-EGR 밸브; 상기 LP-EGR 밸브로 유입된 배기가스를 냉각시키는 LP-EGR 쿨러; 일측은 상기 DPF 후단의 배기관과 연결되고, 타측은 상기 LP-EGR 쿨러와 연결되는 서브라인; 및 상기 배기관과 상기 서브라인 사이에 개폐 가능하도록 마련되어, 상기 DPF로부터 배출되는 배기가스의 이동을 가이드하는 열회수 밸브;를 포함하는 배기가스 열회수 장치가 소개된다.DPF installed on the exhaust side of the engine to purify exhaust gas; An LP-EGR valve provided at the rear end of the DPF to recirculate exhaust gas; An LP-EGR cooler for cooling the exhaust gas introduced into the LP-EGR valve; One side is connected to the exhaust pipe of the rear end of the DPF, the other side is a subline connected to the LP-EGR cooler; And a heat recovery valve provided to be openable and closed between the exhaust pipe and the sub-line to guide the movement of the exhaust gas discharged from the DPF.

Description

배기가스 열회수 장치 {HEAT RECOVERY APPARATUS OF EXHAUST GAS}Exhaust gas heat recovery system {HEAT RECOVERY APPARATUS OF EXHAUST GAS}

본 발명은 배기가스의 열을 회수하여 엔진의 웜업시간을 단축할 수 있도록 하는 배기가스 열회수 장치에 관한 것이다.The present invention relates to an exhaust gas heat recovery apparatus capable of shortening the warm-up time of an engine by recovering the heat of exhaust gas.

터보차지되는 엔진 시스템은 기계적 동력으로 변환시키기 위해 공기와 연료를 연소시키는 연소실들, 유입가스를 상기 연소실들로 전달하는 유입 서브시스템, 및 엔진 배기 서브시스템을 구비한 엔진들을 포함한다. 상기한 터보차저 엔진은 주로 디젤 자동차에 적용되며, 이들 디젤자동차의 주된 대기오염 물질은 질소산화물(NOx)과 입자상 물질(Particulate matter)이다. 따라서, 이들 배기 유해 물질들은 디젤자동차 배기가스 규제의 주요한 대상 물질이 되고 있다.Turbocharged engine systems include engines with combustion chambers for combusting air and fuel for conversion into mechanical power, an inlet subsystem for delivering inlet gas to the combustion chambers, and an engine exhaust subsystem. The turbocharged engine described above is mainly applied to diesel vehicles, and the main air pollutants of these diesel vehicles are nitrogen oxides (NOx) and particulate matter. Therefore, these harmful exhaust substances have become the main target substances of diesel vehicle exhaust gas regulation.

상기 배기 서브시스템들은 일반적으로 배기가스를 상기 엔진 연소실로부터 제거하고, 엔진 배기 소음을 억제시키며, 엔진 연소 온도가 높아질수록 증가하는 질소 산화물(NOx)과 배기가스 입자를 감소시킨다. 배기가스는 배기가스 서브시스템에서 배출되어 외기(fresh air)와의 혼합을 위한 유입 서브시스템으로 유입된 다음, 엔진으로 종종 재순환된다. 배기가스 재순환은 비활성 가스의 양을 증가시킴과 아울러 부수적으로 유입가스 내의 산소를 감소시킴으로써, 엔진 연소 온도를 감소시켜 NOx 생성을 감소시킨다. The exhaust subsystems generally remove exhaust gas from the engine combustion chamber, suppress engine exhaust noise, and reduce nitrogen oxides (NOx) and exhaust gas particles that increase as the engine combustion temperature increases. Exhaust gases are discharged from the exhaust gas subsystem, enter the inlet subsystem for mixing with fresh air, and are then often recirculated to the engine. Exhaust gas recirculation increases the amount of inert gas and concomitantly reduces the oxygen in the incoming gas, thereby reducing the engine combustion temperature and thus reducing NOx production.

이처럼 질소산화물(NOx) 저감을 위한 배기가스 재순환 장치 (EGR; Exhaust Recirculation)는 연소 후 배출되는 배기가스의 일부를 흡입 혼합기에 포함시켜 연소 실로 유입시킴으로써, 혼합기의 자체 공연비는 변화시키지 않으면서 혼합기의 밀도를 저하시켜 연소 온도를 저하시키는 특성을 갖게 된다.In this way, the exhaust gas recirculation (EGR) for reducing NOx includes a part of the exhaust gas discharged after combustion into the combustion chamber by incorporating it into the combustion chamber, so that the mixer's own air-fuel ratio is not changed. It has the characteristic of lowering the combustion temperature by lowering the density.

즉, 상기 EGR 장치는 엔진의 운전 상태에 따라 NOx와 같은 에미션(Emission)을 저감시킬 필요가 있을 때, 배기가스의 일부를 EGR 밸브를 통하여 흡기측에 제공하여 혼합기와 함께 연소실로 유입시키면, 상기 연소실로 유입된 배기가스는 불활성 가스로서 흡입 가스의 체적은 변화하지 않으므로 상대적으로 혼합기의 밀도가 저하되어 화염의 전파 속도를 저하시킴으로써 연소속도가 저하되고, 이에 따라 연소 온도의 상승을 방지하여 NOx와 같은 에미션(Emission)의 발생을 줄여 주게 된다.That is, when the EGR device needs to reduce emissions such as NOx according to the operating state of the engine, a part of the exhaust gas is provided to the intake side through the EGR valve and introduced into the combustion chamber together with the mixer, Since the exhaust gas introduced into the combustion chamber is an inert gas and does not change the volume of the intake gas, the density of the mixer is relatively lowered, thereby lowering the propagation speed of the flame, thereby reducing the combustion rate, thereby preventing an increase in combustion temperature. It reduces the occurrence of emission such as.

이러한 EGR은 터보차저의 터빈을 지난 배기가스를 컴프레셔 전단의 흡기통로로 재순환시키는 저압 EGR(LP-EGR : low pressure EGR)과 배기관과 터빈 사이에서 배기가스를 추출하여 컴프레셔 및 인터쿨러를 지난 흡기통로로 재순환시키는 고압 EGR(HP-EGR : high pressure EGR)로 나뉠 수 있다.These EGRs include low pressure EGR (LP-EGR) that recirculates the exhaust gas passing through the turbine of the turbocharger to the intake passage in front of the compressor, and the intake passage passing the compressor and intercooler by extracting the exhaust gas between the exhaust pipe and the turbine. It can be divided into high pressure EGR (HP-EGR) to recirculate.

상기한 LP-EGR 시스템은 터보챠저 후단의 EGR 가스를 재순환시켜 터보 효율을 증대하여 연비를 개선시키며, DPF 후단의 배기가스를 LP-EGR 쿨러 및 인터쿨러를 거쳐 재순환되므로 많은 양의 EGR 가스의 사용이 가능하여 Nox를 저감하는 효과가 있다.The LP-EGR system described above improves fuel economy by increasing the turbo efficiency by recirculating the EGR gas at the rear end of the turbocharger.Since the exhaust gas at the rear end of the DPF is recirculated through the LP-EGR cooler and intercooler, a large amount of EGR gas is not used. It is possible and has the effect of reducing Nox.

상기의 배경기술로서 설명된 사항들은 본 발명의 배경에 대한 이해 증진을 위한 것일 뿐, 이 기술분야에서 통상의 지식을 가진자에게 이미 알려진 종래기술에 해당함을 인정하는 것으로 받아들여져서는 안 될 것이다.The matters described as the background art are only for enhancing an understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KRKR 1998-0463461998-046346 AA

본 발명은 이러한 문제점을 해결하기 위하여 제안된 것으로, 엔진이 웜업되는 시간을 줄여 연비를 개선하고, 배기가스를 통해 대기로 배출되는 유해물질을 저감하는 배기가스 열회수 장치를 제공하는데 그 목적이 있다.The present invention has been proposed to solve this problem, and an object of the present invention is to provide an exhaust gas heat recovery device that reduces the time during which the engine warms up, improves fuel economy, and reduces harmful substances emitted to the atmosphere through exhaust gas.

상기의 목적을 달성하기 위한 본 발명에 따른 배기가스 열회수 장치는 배기가스의 정화를 위해 엔진의 배기측에 설치되는 DPF; 상기 DPF 후단에 마련되어 배기가스를 재순환시키도록 마련된 LP-EGR 밸브; 상기 LP-EGR 밸브로 유입된 배기가스를 냉각시키는 LP-EGR 쿨러; 일측은 상기 DPF 후단의 배기관과 연결되고, 타측은 상기 LP-EGR 쿨러와 연결되는 서브라인; 및 상기 배기관과 상기 서브라인 사이에 개폐 가능하도록 마련되어, 상기 DPF로부터 배출되는 배기가스의 이동을 가이드하는 열회수 밸브;를 포함한다.The exhaust gas heat recovery apparatus according to the present invention for achieving the above object comprises: a DPF installed on an exhaust side of an engine for purification of exhaust gas; An LP-EGR valve provided at the rear end of the DPF to recirculate exhaust gas; An LP-EGR cooler for cooling the exhaust gas introduced into the LP-EGR valve; One side is connected to the exhaust pipe of the rear end of the DPF, the other side is a subline connected to the LP-EGR cooler; And a heat recovery valve provided to be openable and closed between the exhaust pipe and the subline, and guide the movement of the exhaust gas discharged from the DPF.

상기 열회수 밸브는 상기 열회수 밸브를 개폐하도록 하는 동작부;를 더 포함할 수 있다.The heat recovery valve may further include an operation unit for opening and closing the heat recovery valve.

상기 동작부는 진공식 액추에이터일 수 있다.The operation unit may be a vacuum actuator.

상기 열회수 밸브는 상기 엔진의 냉간시 상기 배기관을 폐쇄하여 상기 DPF를 통과한 배기가스가 상기 LP-EGR 쿨러를 통과하도록 함으로써, 상기 LP-EGR 쿨러 냉각수의 온도를 상승시켜 높은 온도의 냉각수를 상기 엔진에 전달할 수 있다.The heat recovery valve closes the exhaust pipe when the engine is cold to allow the exhaust gas that has passed through the DPF to pass through the LP-EGR cooler, thereby increasing the temperature of the LP-EGR cooler cooling water to transfer the high temperature coolant to the engine. Can be passed on.

상기 열회수 밸브는 상기 엔진의 온간시 상기 서브라인을 폐쇄하여 상기 엔진에서 배출되는 배기가스가 상기 배기관과 상기 LP-EGR 쿨러측으로 분배되어 배출되도록 할 수 있다.The heat recovery valve may close the subline when the engine is warm, so that exhaust gas discharged from the engine is distributed to and discharged to the exhaust pipe and the LP-EGR cooler side.

상술한 바와 같은 구조로 이루어진 배기가스 열회수 장치에 따르면 엔진의 배기측 DPF를 통과한 배기가스를 엔진의 웜업 이전에는 LP-EGR 쿨러측으로 모두 보내어 LP-EGR 쿨러의 냉각수의 온도를 높이고, 온도가 높아진 냉각수를 다시 엔진의 히터코어측으로 보냄으로써, 웜업시간을 단축하여 연비가 개선되고, 차량의 난방성능을 개선할 수 있으며, 배기가스의 형대로 대기에 배출되는 유해물질을 저감할 수 있는 장점이 있다.According to the exhaust gas heat recovery device having the structure as described above, the exhaust gas passing through the DPF on the exhaust side of the engine is sent to the LP-EGR cooler before warming up the engine, thereby increasing the temperature of the cooling water of the LP-EGR cooler and increasing the temperature. By sending the coolant back to the heater core side of the engine, it has the advantage of shortening the warm-up time to improve fuel economy, improve the heating performance of the vehicle, and reduce harmful substances emitted to the atmosphere in the form of exhaust gas. .

도 1은 본 발명의 일 실시예에 따른 배기가스 열회수 장치를 도시한 도면.
도 2는 도 1의 배기가스 열회수 장치가 엔진에 장착된 것을 도시한 도면.
도 3 내지 도 4는 본 발명에 따른 배기가스 및 냉각수의 흐름을 도시한 도면.1 is a view showing an exhaust gas heat recovery apparatus according to an embodiment of the present invention.
2 is a view showing that the exhaust gas heat recovery device of FIG. 1 is mounted on an engine.
3 to 4 are views showing the flow of exhaust gas and cooling water according to the present invention.

이하에서는 첨부된 도면을 참조하여 본 발명의 바람직한 실시 예에 따른 배기가스 열회수 장치에 대하여 살펴본다.Hereinafter, an exhaust gas heat recovery apparatus according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명의 일 실시예에 따른 배기가스 열회수 장치(1000)를 도시한 도면이고, 도 2는 도 1의 배기가스 열회수 장치(1000)가 엔진(100)에 장착된 것을 도시한 도면이다. 또한, 도 3 내지 도 4는 본 발명에 따른 배기가스 및 냉각수의 흐름을 도시한 도면이다.1 is a view showing an exhaust gas heat recovery device 1000 according to an embodiment of the present invention, and FIG. 2 is a view showing that the exhaust gas heat recovery device 1000 of FIG. 1 is mounted on the engine 100 . In addition, Figures 3 to 4 are views showing the flow of exhaust gas and cooling water according to the present invention.

본 발명의 바람직한 일 실시예에 따른 배기가스 열회수 장치는 배기가스의 정화를 위해 엔진(100)의 배기측에 설치되는 DPF(200); 상기 DPF(200) 후단에 마련되어 배기가스를 재순환시키도록 마련된 LP-EGR 밸브(300); 상기 LP-EGR 밸브(300)로 유입된 배기가스를 냉각시키는 LP-EGR 쿨러(350); 일측은 상기 DPF(200) 후단의 배기관(500)과 연결되고, 타측은 상기 LP-EGR 쿨러(350)와 연결되는 서브라인(600); 및 상기 배기관(500)과 상기 서브라인(600) 사이에 개폐 가능하도록 마련되어, 상기 DPF(200)로부터 배출되는 배기가스의 이동을 가이드하는 열회수 밸브(700);를 포함한다.An exhaust gas heat recovery apparatus according to an exemplary embodiment of the present invention includes a DPF 200 installed on the exhaust side of the engine 100 to purify the exhaust gas; An LP-EGR valve 300 provided at a rear end of the DPF 200 to recirculate exhaust gas; An LP-EGR cooler 350 for cooling the exhaust gas introduced into the LP-EGR valve 300; One side is connected to the exhaust pipe 500 at the rear end of the DPF 200, the other side is a sub-line 600 connected to the LP-EGR cooler 350; And a heat recovery valve 700 provided to be opened and closed between the exhaust pipe 500 and the sub-line 600 to guide the movement of the exhaust gas discharged from the DPF 200.

본 발명의 상기 엔진(100)에는 고압 배기가스 재순환 라인(HP-EGR SYSTEM)과 저압 배기가스 재순환 라인(LP-EGR SYSTEM)이 마련된다. 그러나 본 발명의 일실시예에 따른 배기가스 열회수 장치(1000)는 상기 DPF(200)의 후단에 마련된 상기 LP-EGR 시스템측에 마련되므로, 상기 HP-EGR 시스템측에 관한 상세한 설명은 생략하도록 한다.The engine 100 of the present invention is provided with a high pressure exhaust gas recirculation line (HP-EGR SYSTEM) and a low pressure exhaust gas recirculation line (LP-EGR SYSTEM). However, since the exhaust gas heat recovery apparatus 1000 according to an embodiment of the present invention is provided on the LP-EGR system side provided at the rear end of the DPF 200, a detailed description of the HP-EGR system side will be omitted. .

상기 DPF(200)는 상기 엔진(100)으로부터 배출되는 배기가스의 정화를 위해 마련되고, 상기 LP-EGR 밸브(300)는 상기 DPF(200)로부터 유입되는 배기가스를 상기 LP-EGR 쿨러(350)를 통해 냉각시킨 후 다시 흡기(900, 보다 상세하게는 터보차저(TC)의 컴프레서)측으로 공급한다. 본 발명의 배기가스 열회수 장치(1000)는 상기 LP-EGR 밸브(300)측에 상기 열회수 밸브(700)와 상기 서브라인(600)이 추가되는 것이다. 따라서, 상기 열회수 밸브(700)와 상기 서브라인(600)에 의해 상기 엔진(100)의 온도에 따라 상기 DPF(200)를 통과한 배기가스가 상기 배기관(500)으로 바로 배출되거나 혹은 상기 LP-EGR 쿨러(350)를 통과한 후 냉각수의 온도를 높인 후 배출되도록 구성된 것이다.The DPF 200 is provided to purify the exhaust gas discharged from the engine 100, and the LP-EGR valve 300 converts the exhaust gas introduced from the DPF 200 into the LP-EGR cooler 350 After cooling through ), it is supplied back to the intake 900 (more specifically, the compressor of the turbocharger TC). In the exhaust gas heat recovery apparatus 1000 of the present invention, the heat recovery valve 700 and the sub-line 600 are added to the LP-EGR valve 300 side. Accordingly, the exhaust gas passing through the DPF 200 is directly discharged to the exhaust pipe 500 according to the temperature of the engine 100 by the heat recovery valve 700 and the sub-line 600 or the LP- After passing through the EGR cooler 350, it is configured to be discharged after raising the temperature of the cooling water.

보다 상세하게 살펴보면, 상기 서브라인(600)의 일측은 상기 DPF(200) 후단의 상기 배기관(500)과 연결되고, 타측은 상기 LP-EGR 쿨러(350)와 연결된다. 또한, 상기 열회수 밸브(700)는 상기 배기관(500)과 상기 서브라인(600) 사이에 개폐 가능하도록 마련된다. 따라서, 상기 열회수 밸브(700)가 상기 배기관(500)과 상기 서브라인(600) 중 하나를 선택적으로 개방함으로써, 상기 DPF(200)로부터 배출되는 배기가스가 모두 상기 LP-EGR 쿨러(350)를 통과한 후 배출될 것인지, 아니면 상기 DPF(200)로부터 상기 배기관(500)과 상기 LP-EGR 쿨러(350)측으로 분배되어 배출될 것인지 선택되게 된다.In more detail, one side of the subline 600 is connected to the exhaust pipe 500 at the rear end of the DPF 200 and the other side is connected to the LP-EGR cooler 350. In addition, the heat recovery valve 700 is provided to be opened and closed between the exhaust pipe 500 and the sub-line 600. Accordingly, the heat recovery valve 700 selectively opens one of the exhaust pipe 500 and the sub-line 600, so that all exhaust gas discharged from the DPF 200 is reduced to the LP-EGR cooler 350. It is selected whether to be discharged after passing through, or to be distributed and discharged from the DPF 200 to the exhaust pipe 500 and the LP-EGR cooler 350.

도 3 내지 도 4를 통해 상기 열회수 밸브(700)의 동작을 살펴보도록 한다. 상기 엔진(100)의 온도가 소정의 기준값 미만인 경우, 상기 열회수 밸브(700)는 상기 배기관(500)을 폐쇄하여 상기 엔진(100)으로부터 배출되어 상기 DPF(200)를 통과한 배기가스를 상기 LP-EGR 쿨러(350)측으로 모두 배출한다. 본 명세서에서는 상기 엔진 온도의 기준값을 상기 엔진(100)이 웜업 전(냉간시)인지 아니면 웜업후(온간시)인지를 기준으로 하는 경우를 예를 들어 설명하도록 한다.The operation of the heat recovery valve 700 will be described through FIGS. 3 to 4. When the temperature of the engine 100 is less than a predetermined reference value, the heat recovery valve 700 closes the exhaust pipe 500 and discharges the exhaust gas from the engine 100 and passes the DPF 200 to the LP. -All discharge to the EGR cooler (350) side. In the present specification, a case where the reference value of the engine temperature is based on whether the engine 100 is warm-up before (cold) or after warming (warm) is described as an example.

도 3은 상기 엔진(100)의 냉간시 상기 열회수 밸브(700)의 동작을 도시한 것으로서, 상기 열회수 밸브(700)는 상기 배기관(500)을 폐쇄하여 상기 DPF(200)를 통과한 배기가스가 상기 LP-EGR 쿨러(350)를 통과하도록 가이드한다. 따라서, 상기 LP-EGR 쿨러(350)를 통과한 냉각수는 배기가스에 의해 온도가 상승되게 되고, 이러한 방법으로 온도가 높아진 냉각수는 상기 엔진(100)측의 히터코어(400)로 유입되어 상기 엔진(100)의 온도가 높아지는 것을 돕는다. 그러므로 엔진(100)이 웜업에 걸리는 시간이 단축되어 연비가 개선되고, 차량의 난방성능을 개선할 수 있으며, 배기가스로 대기에 배출되는 유해물질을 저감할 수 있는 장점이 있다.3 illustrates the operation of the heat recovery valve 700 when the engine 100 is cold, the heat recovery valve 700 closes the exhaust pipe 500 so that the exhaust gas passing through the DPF 200 Guide to pass through the LP-EGR cooler (350). Therefore, the cooling water that has passed through the LP-EGR cooler 350 is raised in temperature by the exhaust gas, and the cooling water whose temperature has been increased in this way is introduced into the heater core 400 of the engine 100 to be introduced into the engine. Helps increase the temperature of 100. Therefore, there is an advantage in that the time required for the engine 100 to warm up is shortened to improve fuel economy, improve heating performance of the vehicle, and reduce harmful substances emitted to the atmosphere as exhaust gas.

또한, 도 4는 상기 엔진(100)의 온간시 상기 열회수 밸브(700)의 동작을 도시한 것으로서, 상기 열회수 밸브(700)는 상기 서브라인(600)을 폐쇄함으로써, 종래와 같이 상기 엔진(100)에서 배출되는 배기가스가 상기 배기관(500)과 상기 LP-EGR 쿨러(350)측으로 분배되어 배출되도록 한다. In addition, FIG. 4 shows the operation of the heat recovery valve 700 when the engine 100 is warm, and the heat recovery valve 700 closes the subline 600, so that the engine 100 ) Exhaust gas is distributed to the exhaust pipe 500 and the LP-EGR cooler 350 to be discharged.

따라서, 상기 열회수 밸브(700)는 플랩인 것이 바람직할 것이다. 또한, 상기 열회수 밸브(700)는 상기 열회수 밸브(700)를 개폐하도록 하는 동작부(800);를 더 포함할 수 있다. 그러므로 상기 동작부(800)의 동작에 의해 상기 열회수 밸브(700)가 작동될 수 있다. 상기 동작부(800)는 진공식 액추에이터 혹은 모터에 의해 동작하는 액추에이터일 수 있으나, 특별히 한정하는 것은 아니며, 상기 열회수 밸브를 개폐할 수 있는 구조이면 얼마든지 적용 가능하다.Therefore, it would be preferable that the heat recovery valve 700 is a flap. In addition, the heat recovery valve 700 may further include an operation unit 800 for opening and closing the heat recovery valve 700. Therefore, the heat recovery valve 700 may be operated by the operation of the operation unit 800. The operation unit 800 may be a vacuum actuator or an actuator operated by a motor, but is not particularly limited, and any structure capable of opening and closing the heat recovery valve may be applied.

그러므로 상기와 같이 본 발명의 바람직한 배기가스 열회수 장치에 따르면, 엔진의 배기측 DPF를 통과한 배기가스를 엔진의 웜업 이전에는 LP-EGR 쿨러측으로 모두 보내어 LP-EGR 쿨러의 냉각수의 온도를 높이고, 온도가 높아진 냉각수를 다시 엔진의 히터코어측으로 보냄으로써, 웜업시간을 단축하여 연비가 개선되고, 차량의 난방성능을 개선할 수 있으며, 배기가스의 형대로 대기에 배출되는 유해물질을 저감할 수 있는 장점이 있다.Therefore, according to the preferred exhaust gas heat recovery device of the present invention as described above, the exhaust gas that has passed through the exhaust side DPF of the engine is sent to the LP-EGR cooler before warm-up of the engine to increase the temperature of the cooling water of the LP-EGR cooler, and By sending the coolant with increased coolant back to the heater core side of the engine, the warm-up time is shortened to improve fuel economy, improve vehicle heating performance, and reduce harmful substances emitted to the atmosphere in the form of exhaust gas. There is this.

본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구범위에 의해 제공되는 본 발명의 기술적 사상을 벗어나지 않는 한도 내에서, 본 발명이 다양하게 개량 및 변화될 수 있다는 것은 당 업계에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.Although the present invention has been illustrated and described in connection with specific embodiments, it is in the art that the present invention can be variously improved and changed within the scope of the technical spirit of the present invention provided by the following claims. It will be obvious to a person of ordinary knowledge.

100 : 엔진
200 : DPF
300 : LP-EGR 밸브
350 : LP-EGR 쿨러
400 : 히터코어
500 : 배기관
600 : 서브라인
700 : 열회수 밸브
800 : 동작부
900 : 흡기측
1000 : 열회수 장치100: engine
200: DPF
300: LP-EGR valve
350: LP-EGR cooler
400: heater core
500: exhaust pipe
600: subline
700: heat recovery valve
800: operation part
900: intake side
1000: heat recovery device

Claims (5)

배기가스의 정화를 위해 엔진의 배기측에 설치되는 DPF;
상기 DPF 후단에 마련되어 배기가스를 재순환시키도록 마련된 LP-EGR 밸브;
상기 LP-EGR 밸브로 유입된 배기가스를 냉각시키는 LP-EGR 쿨러;
일측은 상기 DPF 후단의 배기관과 연결되고, 타측은 상기 LP-EGR 쿨러와 연결되는 서브라인; 및
상기 배기관과 상기 서브라인 사이에 개폐 가능하도록 마련되어, 상기 DPF로부터 배출되는 배기가스의 이동을 가이드하는 열회수 밸브;를 포함하는 배기가스 열회수 장치.DPF installed on the exhaust side of the engine to purify exhaust gas;
An LP-EGR valve provided at the rear end of the DPF to recirculate exhaust gas;
An LP-EGR cooler for cooling the exhaust gas introduced into the LP-EGR valve;
One side is connected to the exhaust pipe of the rear end of the DPF, the other side is a subline connected to the LP-EGR cooler; And
Exhaust gas heat recovery device comprising a; provided to be opened and closed between the exhaust pipe and the subline, a heat recovery valve for guiding the movement of the exhaust gas discharged from the DPF. 청구항 1에 있어서,
상기 열회수 밸브는 상기 열회수 밸브를 개폐하도록 하는 동작부;를 더 포함하는 것을 특징으로 하는 배기가스 열회수 장치.The method according to claim 1,
The heat recovery valve further comprises an operation unit for opening and closing the heat recovery valve. 청구항 2에 있어서,
상기 동작부는 진공식 액추에이터인 것을 특징으로 하는 배기가스 열회수 장치.The method according to claim 2,
Exhaust gas heat recovery device, characterized in that the operation unit is a vacuum actuator. 청구항 1에 있어서,
상기 열회수 밸브는 상기 엔진의 냉간시 상기 배기관을 폐쇄하여 상기 DPF를 통과한 배기가스가 상기 LP-EGR 쿨러를 통과하도록 함으로써, 상기 LP-EGR 쿨러 냉각수의 온도를 상승시켜 높은 온도의 냉각수를 상기 엔진에 전달하는 것을 특징으로 하는 배기가스 열회수 장치.The method according to claim 1,
The heat recovery valve closes the exhaust pipe when the engine is cold to allow the exhaust gas that has passed through the DPF to pass through the LP-EGR cooler, thereby increasing the temperature of the LP-EGR cooler cooling water to transfer the high temperature coolant to the engine. Exhaust gas heat recovery device, characterized in that delivered to. 청구항 1에 있어서,
상기 열회수 밸브는 상기 엔진의 온간시 상기 서브라인을 폐쇄하여 상기 엔진에서 배출되는 배기가스가 상기 배기관과 상기 LP-EGR 쿨러측으로 분배되어 배출되도록 하는 것을 특징으로 하는 배기가스 열회수 장치.The method according to claim 1,
And the heat recovery valve closes the sub-line when the engine is warm, so that the exhaust gas discharged from the engine is distributed to and discharged to the exhaust pipe and the LP-EGR cooler side.
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