KR20030032659A - an exhaust gas recirculation system of diesel engine - Google Patents
an exhaust gas recirculation system of diesel engine Download PDFInfo
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- KR20030032659A KR20030032659A KR1020010064622A KR20010064622A KR20030032659A KR 20030032659 A KR20030032659 A KR 20030032659A KR 1020010064622 A KR1020010064622 A KR 1020010064622A KR 20010064622 A KR20010064622 A KR 20010064622A KR 20030032659 A KR20030032659 A KR 20030032659A
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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
- F02M26/45—Sensors specially adapted for EGR systems
- F02M26/46—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition
- F02M26/47—Sensors specially adapted for EGR systems for determining the characteristics of gases, e.g. composition the characteristics being temperatures, pressures or flow rates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
- F02M26/54—Rotary actuators, e.g. step motors
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- 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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Abstract
Description
본 발명은 디젤엔진의 배기가스 재순환 시스템에 관한 것으로, 특히 매연 발생량을 저감시킬 수 있도록 된 디젤엔진의 배기가스 재순환 시스템에 관한 것이다.The present invention relates to an exhaust gas recirculation system of a diesel engine, and more particularly, to an exhaust gas recirculation system of a diesel engine to reduce the amount of soot generated.
일반적으로 엔진에서 연료의 연소온도가 지나치게 높아지면 질소산화물(NOx)의 발생량이 증가하게 되는데, 이 질소산화물은 탄화수소(HC), 일산화탄소(CO) 등과 함께 배기가스내 유독성분을 이룬다.In general, when the combustion temperature of the fuel in the engine is excessively high, the amount of nitrogen oxides (NO x ) generated increases, which together with hydrocarbons (HC), carbon monoxide (CO) forms a toxic component in the exhaust gas.
따라서, 이를 저감시키기 위하여 도 1에 도시된 바와 같이, 배기관(1)으로부터 흡기관(2) 쪽으로 연결되는 순환관(3)을 설치하여, 배기관(1)으로 배출되는 배기가스를 다시 흡기관(2)으로 재공급하는 배기가스 재순환 시스템을 적용하였다.Therefore, in order to reduce this, as shown in FIG. 1, a circulation pipe 3 connected to the intake pipe 2 from the exhaust pipe 1 is provided, and the exhaust gas discharged to the exhaust pipe 1 is again intaken ( The exhaust gas recirculation system was reapplied to 2).
즉, 배기가스 속에는 연소에 기여하지 않는 이산화탄소(CO2)가 다량으로 포함되어 있으므로 이 배기가스를 다시 연소실로 유입시켜 불활성 가스가 가지는 열용량에 의해 최고 연소온도를 저하시킴으로써 질소산화물의 생성을 감소시킬 수 있도록 한 것이다.That is, since the exhaust gas contains a large amount of carbon dioxide (CO 2 ) that does not contribute to combustion, the exhaust gas is introduced back into the combustion chamber to reduce the production of nitrogen oxides by lowering the maximum combustion temperature by the heat capacity of the inert gas. I would have to.
이와 같이 배기가스를 재순환시킴에 있어서는 상기 순환관(3)에 EGR밸브(4)를 설치하여 배기가스의 재순환량을 조절할 수 있도록 되어 있는바, 이 EGR밸브(4)는 엔진제어유니트(5;ECU)에 의해 제어되는 스텝모터(6)의 작동에 의해 개폐되도록 되어 있으며, 상기 엔진제어유니트(5)는 냉각수온센서(7), 엔진회전수 감지센서(8), 차속센서(9), 흡기압력센서(10) 등 여러 센서로부터 정보를 입력받아 엔진의 운전상태에 따라서 미리 결정된 프로그램에 맞게 상기 EGR밸브(4)의 개폐를 제어하여 배기가스의 재순환 시기와 양 등을 조절함으로써 배기가스 재공급으로 인해 엔진출력이 저하되지 않도록 하고 있다.In this way, in the recirculation of the exhaust gas, an EGR valve 4 is provided in the circulation pipe 3 so that the amount of recirculation of the exhaust gas can be adjusted. The EGR valve 4 includes an engine control unit 5; Opening and closing by operation of the step motor (6) controlled by the ECU, the engine control unit (5) is a coolant temperature sensor (7), engine speed sensor (8), vehicle speed sensor (9), By receiving information from various sensors such as the intake air pressure sensor 10 and controlling the opening and closing of the EGR valve 4 according to a predetermined program according to the operating state of the engine, the exhaust gas is re-reduced by adjusting the recirculation time and amount of the exhaust gas. The supply does not reduce the engine power.
또한, 배기관(1)으로부터 상기 EGR밸브(4)로 배기가스가 유입되는 경로상에는 EGR쿨러(11)를 설치하여, 재순환되는 배기가스를 냉각시킴으로써 상기 EGR밸브(4)의 성능이나 내구성이 손실되지 않도록 하고 있다.In addition, an EGR cooler 11 is provided on a path through which exhaust gas flows from the exhaust pipe 1 to the EGR valve 4, and the recycled exhaust gas is cooled to prevent loss of performance and durability of the EGR valve 4. I do not.
한편, 디젤엔진은 가솔린엔진과 달리 연료 특성상 다량의 매연(smoke)이 발생하므로, 디젤차량의 배출가스 규제 법규에서는 여타 다른 오염물질과 더불어 상기 매연 배출량도 엄격히 규제하고 있다.On the other hand, diesel engines, unlike gasoline engines, because a large amount of smoke (smoke) is generated due to the characteristics of the fuel, the emission regulations of diesel vehicles, along with other pollutants are strictly regulated soot emissions.
매연은 연소실내에 공급된 신기의 양에 대하여 연료의 양이 적정비율 이상이 될 경우 많이 발생되는데, 다음과 같이 두 가지의 경우를 들수 있다.Soot is often generated when the amount of fuel exceeds the proper ratio with respect to the amount of fresh air supplied into the combustion chamber. There are two cases as follows.
그 중 하나는 질소산화물 저감을 위하여 상기와 같이 배기가스 재순환 시스템을 적용한 경우 배기가스가 과도하게 흡기측으로 재공급되어 상대적으로 신기의 농도가 희박해짐으로써 매연이 발생되는 경우이고, 다른 하나는 여름철 대기온 상승으로 인하여 흡입공기의 밀도가 저하되어 연소실내 신기의 농도가 희박해짐으로써 매연이 발생되는 경우이다.One of them is the case that when exhaust gas recirculation system is applied to reduce the nitrogen oxides, the exhaust gas is excessively re-supplied to the intake side and smoke is generated due to the relatively low concentration of fresh air. Increasing the temperature decreases the density of the intake air, resulting in a lean concentration of fresh air in the combustion chamber.
그런데, 종래 디젤차량에서는 도 2에 도시된 바와 같이, 배기가스 재순환량의 제어가 흡입공기의 온도와는 상관없이 엔진작동의 전 영역에서 상기 엔진제어유니트(5)에 맵핑(mapping)된 내용에 따라 이루어지기 때문에 흡입공기의 온도가 상승되어 매연량이 증가되는 경우에도 배기가스의 재순환 작용이 이루어짐으로써 더욱 많은 양의 매연이 발생하게 되는 문제점이 있었다.However, in the conventional diesel vehicle, as shown in FIG. 2, the control of the exhaust gas recirculation amount is mapped to the contents mapped to the engine control unit 5 in all areas of the engine operation regardless of the temperature of the intake air. Therefore, even if the temperature of the intake air is increased to increase the amount of smoke, there is a problem in that a greater amount of smoke is generated by recycling the exhaust gas.
그런데, 현행 매연 규제 법규에 의한 매연 발생량 테스트는 차량의 정지상태 무부하 급가속조건 더욱이 상온의 실내에서 시험차량을 12~36시간 동안 방치한후실시되기 때문에 테스트에서는 매연발생량이 규제량을 만족하지만, 실제 도로 주행시에는 달라진 엔진 운전조건에 의하여 다량의 매연을 발생시키는 차량도 적지 않다.By the way, the smoke generation test according to the current smoke regulation regulations is carried out after leaving the test vehicle for 12 to 36 hours in a room at room temperature without a sudden acceleration condition of the vehicle, the smoke generation in the test satisfies the regulated amount, In actual road driving, a lot of vehicles generate a large amount of smoke due to changed engine driving conditions.
즉, 매연 테스트는 흡기 온도가 20~30℃인 범위내(상온의 실내이므로)에서 이루어지지만, 실제 주행시에는 계절변화에 따른 대기온의 변화나 주행상태변화(정지, 출발이 반복되는 저속주행--이 경우 여름철에 엔진룸의 온도는 약 70~80℃ 수준까지 상승된다.)에 따라 흡기온이 크게 상승하는 경우가 많으며, 이와 같이 흡기온이 배출가스 측정영역인 상기 20~30℃인 범위 이상으로 상승된 경우에도 종래에는 배기가스 재순환 작용이 이루어져 연소실내 신기의 농도를 더욱 저하시키게 됨으로써 비록, 테스트시에는 규제치를 만족하였다 하더라도 실제 도로 주행시에는 많은 양의 매연을 발생시키는 차량들이 있게 되는 것이다(--질소산화물 등의 유해성분 다발영역인 상기 배출가스 측정영역 이외에서의 배기가스 재순환 작용은 유해성분의 저감에는 효과가 없고 오히려 매연의 발생량만을 증가시키게 된다.).In other words, the smoke test is carried out within the range of intake air temperature of 20 ~ 30 ℃ (because of room temperature), but during actual driving, changes in air temperature or driving conditions due to seasonal changes (stopping at low speed and repeated start- In this case, the temperature of the engine room increases to about 70-80 ° C. in summer.) The intake air temperature often increases significantly, and thus the intake air temperature is in the range of 20-30 ° C., which is an emission gas measurement area. Even if it is raised above, the exhaust gas recirculation action is conventionally performed to further reduce the concentration of the fresh air in the combustion chamber, so that even though the regulation value is satisfied during the test, there are vehicles generating a large amount of smoke during actual road driving. (--Exhaust gas recirculation action outside the above-described flue gas measurement area, which is a noxious component bundle area such as nitrogen oxide, has an effect on reducing harmful ingredients. And thereby increase rather only the amount of soot).
이에 본 발명은 상기와 같은 문제점을 해결하기 위하여 발명된 것으로, 흡기온에 따라 배기가스의 재순환 제어를 실시하여 흡기온이 높을때는 연소실로 재공급되는 배기가스의 양을 줄이거나 공급되지 않도록 함으로써 연소실내 신기의 농도가 지나치게 저하되는 것을 방지하여 매연의 발생을 저감시킬 수 있도록 된 디젤엔진의 배기가스 재순환 시스템을 제공함에 그 목적이 있다.Accordingly, the present invention has been invented to solve the above problems, by performing the recirculation control of the exhaust gas in accordance with the intake temperature, when the intake temperature is high, by reducing or not supplying the amount of exhaust gas supplied to the combustion chamber combustion It is an object of the present invention to provide an exhaust gas recirculation system of a diesel engine that prevents the concentration of indoor fresh air to be reduced so as to reduce the generation of soot.
도 1은 종래의 배기가스 재순환 시스템의 구성도,1 is a configuration diagram of a conventional exhaust gas recirculation system,
도 2는 종래의 배기가스 재순환 시스템의 작동 순서도,2 is an operation flowchart of a conventional exhaust gas recirculation system,
도 3은 본 발명에 따른 배기가스 재순환 시스템의 구성도,3 is a configuration diagram of an exhaust gas recirculation system according to the present invention;
도 4는 본 발명에 따른 배기가스 재순환 시스템의 작동 순서도이다.4 is an operational flowchart of an exhaust gas recirculation system according to the present invention.
*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
1 : 배기관,2 : 흡기관,1: exhaust pipe, 2: intake pipe,
3 : 순환관,4 : EGR밸브,3: circulation pipe, 4: EGR valve,
5 : 엔진제어유니트,6 : 스텝모터,5: engine control unit, 6: step motor,
7 : 냉각수온센서,8 : 엔진회전수센서,7: coolant temperature sensor, 8: engine speed sensor,
9 : 차속센서,10 : 흡기압력센서,9: vehicle speed sensor, 10: intake pressure sensor,
11 : EGR쿨러,12 : 흡기온도센서.11: EGR cooler, 12: intake air temperature sensor.
상기와 같은 목적을 달성하기 위한 본 발명은, 배기관과 흡기관을 연결하는 순환관이 형성되고, 이 순환관에 스텝모터에 의해 작동되는 EGR밸브와 EGR쿨러를 갖추며, 상기 스텝모터는 엔진제어유니트에 의해 작동제어되는 디젤엔진의 배기가스 재순환 시스템에 있어서, 상기 흡기관에 흡기온도센서가 설치되어 흡기온도가 엔진제어유니트에 전달되며, 엔진제어유니트는 흡기온도의 고저에 따라서 배기가스의 재순환량을 조절하도록 된 것을 특징으로 한다.The present invention for achieving the above object, the circulation pipe is connected to the exhaust pipe and the intake pipe is formed, the circulation pipe is provided with an EGR valve and an EGR cooler operated by a step motor, the step motor is an engine control unit In an exhaust gas recirculation system of a diesel engine operated and controlled by an engine, an intake air temperature sensor is installed in the intake pipe so that the intake air temperature is transmitted to the engine control unit, and the engine control unit recirculates the exhaust gas according to the elevation of the intake air temperature. Characterized in that it is to adjust.
따라서, 흡기온도가 고온영역에 있을 때 재순환되는 배기가스의 양을 줄이거나, 배기가스가 재순환되지 않게 됨으로써 매연발생량을 저감할 수 있게 된다.Therefore, when the intake temperature is in the high temperature region, the amount of exhaust gas recycled is reduced, or the exhaust gas is not recycled, thereby reducing the amount of soot generated.
이하, 본 발명을 첨부된 예시도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.
도 3은 본 발명에 따른 디젤엔진의 배기가스 재순환 시스템의 구성도로서, 종래구조와 동일한 부분에는 동일한 참조번호를 부여하면서 그에 대한 설명은 생략한다.3 is a configuration diagram of the exhaust gas recirculation system of the diesel engine according to the present invention, the same reference numerals are given to the same parts as the conventional structure, and description thereof will be omitted.
본 발명은, 흡기관(2)과 배기관(1)을 연결하는 순환관(3)에 EGR밸브(4)와 EGR쿨러(11)가 설치되고, 상기 EGR밸브(4)를 개폐하는 스텝모터(6)를 냉각수온센서(7), 엔진회전수센서(8), 차속센서(9), 흡기압력센서(10) 등 각종 센서들로부터 전달된 정보에 의해 엔진운전상태를 파악한 엔진제어유니트(5)가 제어하도록 된 배기가스 재순환 시스템에 있어서, 상기 흡기관(2)에 흡기의 온도를 감지하는 흡기온도감지센서(12)가 설치되고, 이 흡기온도감지센서(12)는 상기 엔진제어유니트(5)로 흡기의 온도값을 전달하여, 엔진제어유니트(5)는 흡기온도에 따라 스텝모터(6)의 작동을 제어하여 EGR밸브(4)를 통한 배기가스의 재순환량을 조절할수 있도록 된 것에 특징이 있다.According to the present invention, an EGR valve 4 and an EGR cooler 11 are provided in a circulation pipe 3 connecting the intake pipe 2 and the exhaust pipe 1, and a step motor for opening and closing the EGR valve 4 ( 6) the engine control unit which grasps the engine operation state by the information transmitted from various sensors such as the coolant temperature sensor 7, the engine speed sensor 8, the vehicle speed sensor 9, the intake pressure sensor 10, and the like. In the exhaust gas recirculation system to control the exhaust gas recirculation system, an intake air temperature sensor 12 is installed in the intake pipe 2 to sense the temperature of the intake air, and the intake air temperature sensor 12 is connected to the engine control unit. 5) By transmitting the temperature value of the intake air, the engine control unit 5 controls the operation of the step motor 6 in accordance with the intake temperature to adjust the recycle amount of the exhaust gas through the EGR valve (4) There is a characteristic.
상기 엔진제어유니트(5)는 흡기온이 40℃ 이상 되면 배기가스 재순환 작용을 제한하도록 프로그램된다.The engine control unit 5 is programmed to limit the exhaust gas recirculation action when the intake air temperature is 40 ° C or higher.
특히 흡기온 40℃ 이상 영역에서도 히스테리시스(hysteresis)를 감안하여, 흡기온이 40~50℃ 범위에서는 재순환되는 배기가스량을 50%로 제한하고, 50℃이상에서는 100% 제한 즉, 배기가스의 재순환 작용을 완전 차단하도록 프로그램된다.In particular, hysteresis is taken into account even in the intake temperature range of 40 ° C or higher, and the intake temperature limits the amount of exhaust gas recycled to 50% in the range of 40 to 50 ° C, and 100% above 50 ° C. It is programmed to block completely.
이하, 도 4를 참조하여 본 발명의 작동을 설명한다.4, the operation of the present invention will be described.
차량이 주행을 시작하여(차속 2km/h이상인 것으로 판단) 흡기온이 40℃ 이하일 경우에는 종래와 동일하게 엔진제어유니트(5)에 입력된 프로그램에 의하여(mapping data에 근거하여) 배기가스 재순환량을 제어한다.When the vehicle starts to run (it is determined that the vehicle speed is 2 km / h or more) and the intake air temperature is 40 ° C. or lower, the exhaust gas recirculation amount (based on the mapping data) by the program inputted to the engine control unit 5 as in the prior art. To control.
그러나, 계절적인 요인 또는 주행상태에 따라 에어클리너를 통하여 흡입되는 흡기의 온도가 40℃ 이상이 되면, 순환관(3)을 통해 흡입계로 재순환되는 배기가스의 양을 50% 감소시킨다.However, when the temperature of the intake air suctioned through the air cleaner becomes 40 ° C. or more according to seasonal factors or driving conditions, the amount of exhaust gas recycled to the intake system through the circulation pipe 3 is reduced by 50%.
이어, 흡기온이 더욱 상승하여 50℃ 이상이 되면 배기가스의 재순환량을 100%감소 즉, 배기가스가 흡입계로 재순환되지 못하도록 한다.Subsequently, if the intake air temperature rises further to 50 ° C. or more, the amount of recycled exhaust gas is reduced by 100%, that is, the exhaust gas cannot be recycled to the intake system.
이와 같이, 연소실로 유입되는 흡입공기 중에 배기가스의 양이 줄어듦으로써 신기의 양이 증가하여 연료가 보다 활발하게 연소될 수 있게 되므로 매연의 발생량이 줄어들게 되는 것이다.In this way, the amount of exhaust gas is reduced by reducing the amount of exhaust gas in the intake air flowing into the combustion chamber, so that the fuel can be burned more actively, and thus the amount of smoke generated is reduced.
한편, 상기와 같이 배기가스의 재순환 작용이 완전히 차단되었을 경우에는 배기가스가 순환될때에 비하여 상대적으로 엔진의 출력이 향상되게 되는데, 따라서배기가스가 재순환될때의 출력정도를 유지하기 위해서는 연료의 양을 줄여도 무방하며, 이와 같이 연료의 양을 줄임으로써 상대적으로 연소실내 공기량이 증가하기 때문에 공기농도희박(즉, 연료량 과다) 문제가 개선되어, 이또한 매연을 저감시키는 원인이 될 수 있다.On the other hand, when the recirculation of the exhaust gas is completely blocked as described above, the output of the engine is relatively improved compared to when the exhaust gas is circulated. Therefore, in order to maintain the output level when the exhaust gas is recycled, the amount of fuel is increased. It is also possible to reduce, and by reducing the amount of fuel in this way, because the amount of air in the combustion chamber is relatively increased, the problem of lean air concentration (ie, excessive fuel amount) is improved, which may also be a cause of reducing soot.
여기서, 연료량을 감소시킬 때 흡기온이 50℃ 이상이면 정상 연료량의 90%, 60℃ 이상이면 85%... 와 같은 방식으로 공급할 수 있으며, 정확한 온도와 감소량은 엔진 종류에 따라 시험을 실시하여 최적치를 알아낸후, 상기 엔진제어유니트(5)에 맵핑하여야 한다.Here, when reducing the fuel amount, it can be supplied in the same manner as 90% of the normal fuel amount when the intake temperature is 50 ° C or higher, and 85% ... when the temperature is higher than 60 ° C. After finding the optimum value, it should be mapped to the engine control unit 5.
한편, 흡기온이 20℃ 이하일 경우에는 흡기의 농도가 희박해질 우려가 적고, 또한 배기가스 재순환은 엔진의 출력을 저감시키는 요인이 되므로 이 영역에서도 엔진제어유니트(5)는 배기가스를 재순환시키지 않는 제어작용을 수행한다.On the other hand, when the intake air temperature is 20 ° C. or lower, the concentration of the intake air is less likely to be scarce, and the exhaust gas recirculation is a factor that reduces the engine output. Therefore, the engine control unit 5 does not recycle the exhaust gas even in this region. Perform control actions.
이상 설명한 바와 같이 본 발명에 따르면, 흡기온이 상승하여 연소실내 신기의 농도가 희박해짐으로써 상대적 연료량 과다에 의한 매연 발생량 증가를 억제할 수 있는 효과가 있다.As described above, according to the present invention, the intake air temperature rises and the concentration of the fresh air in the combustion chamber becomes thin, whereby an increase in the amount of smoke generated by the relative fuel amount is suppressed.
또한, 현재 실시되는 매연 규제 법규에 의한 테스트를 통과한 차량 중에서도 실제 주행중 흡기의 온도조건이 변화함에 따라 매연을 발생시키는 차량이 있게 되는데 본 발명을 적용함으로써 이러한 현상을 해소할 수 있게 된다.In addition, among the vehicles that have passed the test according to the current smoke regulation regulations, there is a vehicle that generates smoke as the temperature conditions of the intake air during the actual driving, this phenomenon can be solved by applying the present invention.
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| KR100895276B1 (en) * | 2009-01-28 | 2009-05-04 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
| KR100915345B1 (en) * | 2009-01-28 | 2009-09-03 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
| KR100915346B1 (en) * | 2009-01-28 | 2009-09-03 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
| KR101047707B1 (en) * | 2008-12-05 | 2011-07-08 | 현대자동차주식회사 | Exhaust gas recirculation apparatus and its driving method |
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| KR101047707B1 (en) * | 2008-12-05 | 2011-07-08 | 현대자동차주식회사 | Exhaust gas recirculation apparatus and its driving method |
| KR100895276B1 (en) * | 2009-01-28 | 2009-05-04 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
| KR100915345B1 (en) * | 2009-01-28 | 2009-09-03 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
| KR100915346B1 (en) * | 2009-01-28 | 2009-09-03 | 주식회사 엠스코 | Exhaust gas recirculation system for reducing nox |
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