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GDI 엔진의 냉각수온에 따른 연소성능 및 입자상 물질 배출특성
이효근(Hyo Keun Lee),최관희(Kwan Hee Choi),박심수(Simsoo Park),박종일(Jongil Park),한승국(Seung Kook Han) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.6
본 논문에서는 GDI 엔진의 냉각수 온도에 따른 연소 및 배출가스 특성을 연구하였다. 엔진에서 나오는 입자상 물질의 수와 크기 분포는 DMS-500 장비로 측정하였다. 배기포트 에 장착된 CLD-400 과 HFR-400 을 통해 NOx 및 THC 의 배출 특성을 연소주기 별로 측정하였다. 결과적으로 낮은 냉각수온에서 5~10 ㎚의 입자상 물질이 크게 증가하는 특성을 보였다. THC 또한 낮은 냉각수온에서 증가하는 특성을 보였는데 이는 연소실 내 연료의 액막현상 때문이다. 그리고 NOx 는 높은 냉각수온에서 감소하는 특성을 보였는데 이는 내부 EGR 이 증가하기 때문이다. 결론적으로 THC 와 NOx 그리고 입자상 물질의 배출을 줄이기 위해서는 냉각수온을 빠르게 올리는 EMS 변수 설정 필요하다. This paper investigated about combustion and exhaust gas characteristics of GDI engine according to the cooling water temperature. Engine-out nano-particle number emission and size distribution were measured by DMS-500 equipped upstream of catalyst. CLD-400 and HFR-400 were equipped at the exhaust port to analyze cyclic NOx and THC characteristics. As a result, nano-particle number emission greatly increased at the low coolant temperature 5~10 ㎚ size PM mainly exhausted. THC also increased at the low temperature condition due to fuel film on the combustion chamber. And NOx decreased at high temperature condition because of the increment of internal EGR. In conclusion, EMS control strategy to drive coolant temperature up rapidly is needed to reduce not only THC and NOx but nano-particle emissions.
가솔린 엔진에서 연료분사 압력이 천이운전시 배출가스 특성에 미치는 영향
이형민(Hyungmin Lee),명차리(Cha-Lee Myung),박심수(Simsoo Park),임혁(Hyuk Im),한승국(Seung Kook Han),김우태(Wootai Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This work was investigated time resolved emissions behavior such as THC, NOx, and smoke emitted from tail-pipe on CVVT gasoline engine under fast transient operation with different fuel injection pressures. Transient operation type was simulated into very fast transient considering acceleration, steady, deceleration with automatically controlled servo motor which is coupled to throttle valve. Simultaneously measuring emissions with fast response gas analyzer and high sensitivity opacimeter, various sensor and actuating signals of a gasoline engine were diagnosed to verify the emission formation mechanism during transient operation. Consequently, high pressure injection plays a major role in emissions reduction during transient operation.
GDI 엔진의 냉각수온에 따른 연소성능 및 입자상 물질 배출 특성
이효근(Hyo Keun Lee),최관희(Kwan Hee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),박종일(Jongil Park),한승국(Seung Kook Han) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.2
본 논문에서는 GDI 엔진의 냉각수 온도에 따른 연소 및 배출가스 특성을 연구하였다. 엔진에서 나오는 입자상 물질의 수와 크기 분포는 DMS-500 장비로 측정하였다. 배기포트 에 장착된 CLD-400 과 HFR-400 을 통해 NOx 및 THC 의 배출 특성을 연소주기 별로 측정하였다. 결과적으로 낮은 냉각수온에서 5~10 ㎚ 의 입자상 물질이 크게 증가하는 특성을 보였다. THC 또한 낮은 냉각수온에서 증가하는 특성을 보였는데 이는 연소실 내 연료의 액막현상 때문이다. 그리고 NOx 는 높은 냉각수온에서 감소하는 특성을 보였는데 이는 내부 EGR 이 증가하기 때문이다. 결론적으로 THC 와 NOx 그리고 입자상 물질의 배출을 줄이기 위해서는 냉각수온을 빠르게 올리는 EMS 변수 설정 필요하다. This paper investigated the combustion and exhaust gas characteristics of gasoline direct injection engines for various cooling water temperature. The engine-out nanoparticle emission number and size distribution were measured by a DMS-500 equipped upstream of the catalyst. A CLD-400 and an HFR-400 were equipped at the exhaust port to analyze the cyclic NOx and total hydrocarbon emission characteristics. The results showed that the nanoparticle emission number greatly increased at low coolant temperatures and that the exhaust mainly contained particulate matter of 5?10 ㎚. THC also increased under low temperature conditions because of fuel film on the combustion chamber. NOx emissions decreased under high temperature conditions because of the increase in internal exhaust gas recirculation. In conclusion, an engine management system control strategy for driving coolant temperature up rapidly is needed to reduce not only THC and NOx but also nanoparticle emissions.
GDI 엔진의 연료 분사 제어 로직에 따른 나노입자 배출 특성에 관한 연구
이효근(Hyokeun Lee),최관희(Kwanhee Choi),명차리(Cha-Lee Myung),박심수(Simsoo Park),박종일(Jongil Park),한승국(Seung Kook Han) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Nano-particle characteristics were investigated in the gasoline direct injection engine, for various air fuel ratios, fuel pressures and fuel injection timings in the part load condition. PN concentration and size distribution were measured by the DMS-500 equipped upstream of catalyst. Nano particle emission was closely related with fuel injection timing and in-cylinder flow motion in GDI engine. As a result, PN was decreased with increasing air fuel ratio and fuel pressure. And fuel injection timing was retarded over the middle intake stroke, particle emission was increased but reduced PN during the early intake stroke. In conclusion, optimization of the ECU control strategy on the fuel injection pressure, injection timing as well as air fuel ratio was needed to improve the nano particle emissions in GDI engine.
가솔린 직접분사 엔진 배기시스템의 온도균일도 특성에 관한 연구
오세두(Se-Doo Oh),박광진(Kwang-Jin Park),김현준(Hyun-Jun Kim),이호길(Ho-Kil Lee),정수진(Soo-Jin Jeong),박종일(Jong-Il Park),한승국(Seung-Kook Han) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The development targets of the gasoline engine should achieve the emission performance to comply with the LEV2-ULEV and EU Euro-5 emission requirements, and this engine have to meet SULEV and Euro-6 regulation in the near future. Because the majority of all harmful exhaust gases are emitted during the starting of the exhaust emission test, the fast light-off technology of catalyst is the key to meeting future stringent emissions regulations. In this study, temperature uniformity characteristics of exhaust gas were investigated in test modes of FTP-75 and NEDC, mounting thermocouples on exhaust system of the gasoline direct injection vehicle. The temperature distribution in catalyst cone and emission characteristics were evaluated in respect to test time each mode. And, the uniformity index for exhaust gad temperature were analyzed.