KR100340107B1 - EGR system - Google Patents
EGR system Download PDFInfo
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- KR100340107B1 KR100340107B1 KR1019990067612A KR19990067612A KR100340107B1 KR 100340107 B1 KR100340107 B1 KR 100340107B1 KR 1019990067612 A KR1019990067612 A KR 1019990067612A KR 19990067612 A KR19990067612 A KR 19990067612A KR 100340107 B1 KR100340107 B1 KR 100340107B1
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- egr
- pipe
- filter
- egr system
- branch pipe
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- 239000000498 cooling water Substances 0.000 claims abstract description 7
- 239000004071 soot Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims 5
- 238000007599 discharging Methods 0.000 claims 1
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000004043 responsiveness Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
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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
- F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
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- 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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/10—Combinations of different methods of purification cooling and filtering
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- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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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
- F02M26/14—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
- F02M26/16—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 with EGR valves located at or near the connection to the exhaust system
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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)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
본 발명의 목적은 종래 EGR 시스템의 결점이었던 출력 및 내구성 저하를 최소화하여, 높은 EGR율의 달성이 가능하며 운전조건에의 응답성이 좋은 EGR 시스템을 제공하는 데 있다.An object of the present invention is to provide an EGR system capable of achieving a high EGR rate and having good responsiveness to operating conditions by minimizing output and durability deterioration, which were disadvantages of the conventional EGR system.
이를 위해 본 발명은 배기매니폴드와 흡기매니폴드를 연결하는 EGR 파이프,To this end, the present invention is an EGR pipe connecting the exhaust manifold and the intake manifold,
EGR 파이프의 도중에 설치되어 엔진의 흡기부압에 의해 개폐량이 조정되는 EGR 밸브를 포함하는 EGR 시스템에 있어서,In the EGR system including an EGR valve provided in the middle of the EGR pipe, the opening and closing amount is adjusted by the intake negative pressure of the engine,
상기 EGR 파이프의 도중에 HC등의 매연을 포집하도록 설치되는 필터와;A filter installed to collect soot such as HC in the middle of the EGR pipe;
상기 EGR 파이프의 도중에 설치되어 라디에이터를 통과하면서 냉각된 냉각수가 유입되어 배기가스와 열교환을 행하는 쿨러;를 포함하여 구성되는 것을 특징으로 한다.And a cooler installed in the middle of the EGR pipe and passing through the radiator to cool the cooling water to exchange heat with the exhaust gas.
Description
본 발명은 NOx배출량 감소를 위한 배기 가스리턴 공급시스템(EGR 시스템)에 관한 것이다.The present invention relates to an exhaust gas return supply system (EGR system) for reducing NOx emissions.
엔진으로부터 배출되는 배기가스속에는 대기오염을 유발하고 인체에 유해한 CO,HC,NOx 가스가 다량 포함되어 있다. 이들 유해가스를 제거하기 위해 촉매컨버터가 배기계에 설치되는 데 CO,HC,NOx의 배출 조건이 각기 다르기 때문에 이들을 효율적으로 감소시키기에는 어려움이 따른다. CO가스의 경우 보통의 운전조건하에서 공기공급량이 충분하여 연소가 잘되기 때문에 CO₂까지 반응이 진행하게 되므로 CO의 배출농도는 그다지 높지 아니하며, 이론 공연비 운전조건하에서 촉매컨버터를 통해 쉽게 정화처리 할 수 있다. 그리고 HC의 경우는 연료가 타고 남은채로 배출되게 되는 데 배기온도가 매우 낮은 경우나 연소실의 온도가 낮은 경우 및 착화 지연이 긴 연료를 사용하는 경우에 많이 발생하며, 또 고속 또는 저부하로 운전되고 있을때 흡입공기량에 비하여 분사되는 연료량이 너무 적어 실화가 일어나 HC가 발생하기도 한다.The exhaust gas from the engine contains a large amount of CO, HC, and NOx gases that cause air pollution and are harmful to the human body. In order to remove these harmful gases, catalytic converters are installed in the exhaust system, and CO, HC, and NOx have different discharge conditions, which makes it difficult to reduce them efficiently. In the case of CO gas, under normal operating conditions, the air supply is sufficient and combustion is good, so the reaction proceeds up to CO2. Therefore, the CO concentration is not very high, and it can be easily purified through the catalytic converter under the theoretical air-fuel ratio operating conditions. . In the case of HC, the fuel is discharged with the remaining fuel, and the exhaust temperature is very low, the combustion chamber temperature is low, and when the fuel with a long ignition delay is used, it is operated at high speed or low load. When it is present, the amount of injected fuel is too small compared to the amount of intake air, so that misfire occurs and HC is generated.
한편 NOx의 경우 연소온도의 온도가 높은 경우에 배출량이 크게 증대하게 되는데 압축비가 높은 디젤엔진의 경우 NOx 배출량의 규제요건을 지키기가 어렵다. 이때문에 배기가스의 일부를 흡기측으로 재순환시켜 혼합기와 함께 연소함으로서 연소실의 온도를 낮추어 NOx 발생량의 감소를 가져오는 EGR 시스템이 특히 디젤엔진의 경우 상용화되고 있다.On the other hand, in the case of NOx, the emissions increase significantly when the combustion temperature is high. However, in the case of diesel engines with a high compression ratio, it is difficult to comply with the regulatory requirements for NOx emissions. For this reason, the EGR system which recycles a part of exhaust gas to the intake side and combusts with a mixer lowers the temperature of a combustion chamber and reduces NOx generation, especially in the case of a diesel engine.
그러나 EGR 시스템을 채택함으로서 NOx배출량을 감소시킬 수 있게 된 반면 엔진 출력이 저하되고, HC나 CO가스등의 배출량이 상대적으로 많아지는 문제점이 있으며, 또 높은 EGR율을 확보하기 위하여 흡기계측에 액츄에이터등의 부가장치를 설치해야 되는 번거로움 및 카본등의 축적에 의해 엔진 내구성 저하를 유발하는 문제점이 지적되고 있다.However, by adopting the EGR system, NOx emissions can be reduced, while engine output is lowered, and emissions such as HC and CO gas are relatively high. Also, in order to secure a high EGR rate, actuators such as actuators on the intake side are secured. It is pointed out that a problem that causes the durability of the engine due to the cumbersome cumbersome and the accumulation of carbon, etc. to install the additional device.
이에 본 발명은 상기한 문제점을 감안하여 제안한 것으로서 그의 목적으로 하는 것은 종래 EGR 시스템의 결점이었던 출력 및 내구성 저하를 최소화하여, 높은 EGR율의 달성이 가능하며 운전조건에의 응답성이 좋은 EGR 시스템을 제공하는 데 있다.Therefore, the present invention has been proposed in view of the above problems, and its object is to minimize the power and durability deterioration, which is a drawback of the conventional EGR system, and to achieve a high EGR rate and to provide an EGR system with good responsiveness to operating conditions. To provide.
상기한 목적을 달성하기 위하여 본 발명의 EGR 시스템은 배기매니폴드와 흡기매니폴드를 연결하는 EGR 파이프, EGR 파이프의 도중에 설치되어 엔진의 흡기부압에 의해 개폐량이 조정되는 EGR 밸브를 포함하는 EGR 시스템에 있어서,In order to achieve the above object, the EGR system of the present invention is provided in an EGR system including an EGR pipe connecting the exhaust manifold and the intake manifold, and an EGR valve installed in the middle of the EGR pipe to adjust the opening and closing amount by the intake negative pressure of the engine. In
상기 EGR 파이프의 도중에 HC등의 매연을 포집하도록 설치되는 필터와;A filter installed to collect soot such as HC in the middle of the EGR pipe;
상기 EGR 파이프의 도중에 설치되어 라디에이터를 통과하면서 냉각된 냉각수가 유입되어 배기가스와 열교환을 행하는 쿨러;를 포함하여 구성되는 것을 특징으로 한다.And a cooler installed in the middle of the EGR pipe and passing through the radiator to cool the cooling water to exchange heat with the exhaust gas.
본 발명의 청구항 2 기재에 의하면 상기 EGR 파이프는 도중에 2갈래로 분기되었다가 다시 합류되며, 각각의 분기관에 상기 필터가 설치되어 있는 것을 특징으로 한다.According to the second aspect of the present invention, the EGR pipe is bifurcated into two branches on the way and is joined again, and the filter is provided in each branch pipe.
본 발명의 청구항 3기재에 의하면 상기 분기관의 분기 지점에는 각각의 분기관을 선택적으로 개폐하도록 작동되는 밸브가 설치되는 것을 특징으로 한다.According to the third aspect of the present invention, the branch point of the branch pipe is characterized in that the valve is operated to selectively open and close each branch pipe.
그리고 본 발명의 청구항 4기재에 의하면 상기 밸브는 전자제어장치의 제어에 의해 오염된 필터측의 분기관을 차단하고 타측 분기관은 개방하도록 작동되는 것을 특징으로 한다.And according to claim 4 of the present invention, the valve is characterized in that it operates to block the branch pipe of the filter side contaminated by the control of the electronic control device and the other branch pipe is open.
본 발명의 청구항 5기재에 의하면 상기 각각의 필터 후방의 압력을 측정하기 위한 압력 센서가 분기관에 설치되며, 상기 전자제어장치는 상기 압력 센서가 측정한 압력이 필터가 막힌 것으로 판정시에 상기 밸브를 절환 작동제어 하게 되는 것을 특징으로 한다.According to the fifth aspect of the present invention, a pressure sensor for measuring the pressure behind each filter is provided in the branch pipe, and the electronic controller determines that the valve when the pressure measured by the pressure sensor determines that the filter is clogged. It characterized in that the switching operation control.
또 본 발명의 청구항 6기재에 의하면 상기 EGR 파이프의 도중에 리턴되는 배기 가스열을 방출하기 위한 냉각핀이 설치되어 있는 것을 특징으로 한다.According to a sixth aspect of the present invention, there is provided a cooling fin for releasing exhaust gas heat returned in the middle of the EGR pipe.
도 1은 본 발명에 의한 EGR 시스템을 나타내는 도면1 is a view showing an EGR system according to the present invention
※도면의 주요 부분에 대한 부호의 설명※ Explanation of code for main part of drawing
1 : 엔진 2 : 배기매니폴드1: engine 2: exhaust manifold
3 : 흡기매니폴드 4 : EGR 파이프3: intake manifold 4: EGR pipe
5 : EGR 밸브 6,7: 분기관5: EGR valve 6,7: branch pipe
8,9: 필터 10 : 밸브8,9: filter 10: valve
11 : 전자제어장치 12,13 : 압력센서11: electronic control device 12, 13: pressure sensor
14 : 쿨러 15 : 입구파이프14: cooler 15: inlet pipe
16 : 유출파이프 17 : 냉각핀16: outlet pipe 17: cooling fin
이하 본 발명의 구성과 작용을 첨부한 도면을 참조하여 설명한다.Hereinafter, the configuration and operation of the present invention will be described with reference to the accompanying drawings.
도 1은 본 발명에 의한 EGR 시스템을 나타내는 도면으로 도면중 부호 1은 엔진이며, 부호2는 배기매니폴드, 부호3은 흡기매니폴드이다.1 is a diagram showing an EGR system according to the present invention, in which 1 is an engine, 2 is an exhaust manifold, and 3 is an intake manifold.
배기매니폴드(2)와 흡기매니폴드(3)는 배기가스를 리턴공급하는 EGR 파이프(4)로 연결되어 있으며, EGR 파이프(4)에는 엔진의 흡기부압에 연동하여 개폐량이 조정되는 통상적 구조의 EGR 밸브(5)가 설치되어 있다.The exhaust manifold 2 and the intake manifold 3 are connected by an EGR pipe 4 for supplying exhaust gas, and the EGR pipe 4 has a conventional structure in which the opening and closing amount is adjusted in conjunction with the intake negative pressure of the engine. The EGR valve 5 is provided.
EGR 파이프(4)의 도중에는 2개의 분기관(6)(7)이 갈라졌다가 다시 합류하고 있으며, 각 분기관(6)(7)에는 배기가스중에 포함된 HC나 타르등의 매연등을 포집하는 필터(8)(9)가 설치되어 있으며, 2개 분기관(6)(7)의 분기점에는 각 분기관(6)(7)을 선택적으로 개폐하는 밸브(10)가 설치된다.In the middle of the EGR pipe 4, two branch pipes 6 and 7 are divided and joined again, and each branch pipe 6 and 7 collects soot such as HC and tar contained in the exhaust gas. Filters 8 and 9 are provided, and a valve 10 for selectively opening and closing each branch pipe 6 and 7 is provided at the branch points of the two branch pipes 6 and 7.
이 밸브(10)는 전자제어장치(11)의 제어에 의해 액츄에이터 구동에 의해 작동이 절환되며, 전자제어장치(11)는 각 분기관(6)(7)의 압력을 측정하는 압력센서(12)(13)로부터의 정보에 의해 밸브(10)의 작동을 제어한다.The valve 10 is switched by the actuator driving under the control of the electronic control device 11, the electronic control device 11 is a pressure sensor 12 for measuring the pressure of each branch pipe (6) (7) The operation of the valve 10 is controlled by the information from.
그리고 EGR 파이프(4)의 도중에는 쿨러(14)가 설치되며, 쿨러(14)에는 라디에이터를 통해 냉각된 저온의 냉각수가 입구파이프(15)를 통해 유입되어 배기가스를(4)냉각한 후 유출파이프(16)를 통해 냉각수가 엔진으로 순환하도록 되어 있다.The cooler 14 is installed in the middle of the EGR pipe 4, and the cooler 14 has a low temperature cooling water introduced through the inlet pipe 15, and cools the exhaust gas 4 through the inlet pipe 15. Cooling water is circulated to the engine via 16.
또 상기 냉각수에 의한 쿨러(14)와는 별도로 EGR 파이프(4)의 도중에 공랭식의 냉각핀(17)이 설치되어 있다.In addition to the cooler 14 by the cooling water, an air-cooling cooling fin 17 is provided in the middle of the EGR pipe 4.
이와 같은 본 발명은 엔진이 구동되고 연소온도가 높아지는 운전 조건이 되면 흡기 부압에 비례하여 EGR 밸브(5)의 열림량이 증가하게 되며, 배기매니폴드(2)로 배출되는 배기가스의 일부가 개방된 EGR 파이프(4)를 통해 흡기매니폴드(3)측에 공급된다.In the present invention, when the engine is driven and the combustion temperature is increased, the opening amount of the EGR valve 5 increases in proportion to the intake negative pressure, and a part of the exhaust gas discharged to the exhaust manifold 2 is opened. It is supplied to the intake manifold 3 side via the EGR pipe 4.
배기가스는 EGR 파이프(4)를 통해 리턴되는 도중에 냉각핀(17)부위를 지나면서 1차로 냉각된다.The exhaust gas is primarily cooled while passing through the cooling fins 17 on the way back through the EGR pipe 4.
다음에 냉각된 배기가스는 밸브(10)가 개방된 측의 분기관(7)을 통하여 흐름이 일어나게 되며, 개방상태의 분기관(7)에 설치된 필터(9)를 통과하면서 HC나 타르등의 성분을 제거하게 되며, 깨끗해진 배기가스는 다시 쿨러(14)를 통과하면서 차가운 냉각수와의 열교환에 의해 냉각되어 배가가스 밀도가 높아지게 된다.Next, the cooled exhaust gas flows through the branch pipe 7 on the side where the valve 10 is opened, and passes through the filter 9 installed in the branch pipe 7 in the open state, such as HC or tar. The components are removed, and the clean exhaust gas is cooled by heat exchange with cold cooling water while passing through the cooler 14, thereby increasing the doubling gas density.
다음에 벨로우즈부(18)를 통과하여 흡기매니폴드로(3)로 유입된 깨끗하고 차가운 배기가스는 엔진(1)에 유입되어 혼합기와 함께 고르게 섞여 연소된 후 다시 배출된다.Next, the clean and cool exhaust gas flowing into the intake manifold path 3 through the bellows unit 18 flows into the engine 1, is mixed with the mixer, combusted, and discharged again.
여기서 필터(9)가 HC나 타르등에 의해 막혀 오염되면 필터 전방의 압력은 높아지나 필터 후방의 압력은 저하되며, 이 저하된 압력이 압력센서(13)에 의해 검출되어 전자제어장치(11)에 보내어진 압력 정보가 기준치보다 낮은 것으로 판정되면 전자제어장치(11)는 필터(9)가 막혀 교체 대상으로 판단하여 액츄에이터를 구동하여 밸브(10)를 전환하여 필터(9)가 막힌 분기관(7)을 차단하고 타측의 분기관(6)을 개방하게 된다.If the filter 9 is clogged with HC or tar and contaminated, the pressure in front of the filter is increased, but the pressure at the back of the filter is lowered. The reduced pressure is detected by the pressure sensor 13 and is applied to the electronic controller 11. If it is determined that the sent pressure information is lower than the reference value, the electronic control device 11 determines that the filter 9 is blocked and is a replacement object, and drives the actuator to switch the valve 10 so that the branch pipe 7 with the filter 9 clogged. ) And open the other branch pipe (6).
이에따라 리턴되는 배기가스는 정상상태의 필터(8)를 통과하여 지나면서 이물질을 여과하게 되며, 막힌 필터(9)는 교체하게 된다.Accordingly, the returned exhaust gas passes through the filter 8 in the normal state to filter foreign substances, and the clogged filter 9 is replaced.
이와같이 하여 배기가스가 냉각되어 밀도가 상승하므로 충분한 EGR율을 얻을 수 있으며, 또 필터에 의해 여과된 후 흡기 매니폴드측에 공급되므로 드로틀밸브등에의 카본 퇴적을 방지하게 되는 것이다.In this way, the exhaust gas is cooled and the density is increased, so that a sufficient EGR ratio can be obtained, and since the exhaust gas is filtered by the filter and supplied to the intake manifold, carbon deposition on the throttle valve or the like is prevented.
이상과 같은 본 발명은 EGR 파이프의 도중에 배기가스 냉각수단과 여과수단을 마련하는 것에 의해서 이물질이 제거되어 깨끗해지고 밀도가 높아진 공기를 흡기계측에 공급할 수 있어 높은 EGR율을 확보할 수 있고 흡기계에의 카본 퇴적을 방지하여 엔진 출력 및 내구력 저하를 최소화 할 수 있게 되는 효과가 있다.According to the present invention as described above, by providing the exhaust gas cooling means and the filtration means in the middle of the EGR pipe, it is possible to supply clean and dense air to the intake side by removing the foreign matter, thereby ensuring a high EGR rate. By preventing carbon deposition, it is possible to minimize the reduction in engine power and durability.
Claims (6)
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| KR1019990067612A KR100340107B1 (en) | 1999-12-31 | 1999-12-31 | EGR system |
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| KR100589261B1 (en) * | 2004-02-18 | 2006-06-15 | 현대모비스 주식회사 | recycling system of waste gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100589261B1 (en) * | 2004-02-18 | 2006-06-15 | 현대모비스 주식회사 | recycling system of waste gas |
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