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물리-화학적 분석기법을 통한 승용 디젤 엔진에서 윤활유가 PM 성분에 미치는 영향 분석 및 배출 특성에 관한 연구
시우성(Woosung Si),손정훈(Junghun Son),진동영(Dongyoung Jin),이영재(Youngjea Lee),김정환(Jeong-hwan Kim),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The main purpose of this research is for the investigation on the impact of engine oil on particulate matters characteristics by using various physical-chemical PM analysis methods from light-duty diesel engine. Especially, combustion related PM (particulate matter) and PN (particle number) concentrations in the exhaust gases influence the degradation of both the engine oil, engine durability, and vehicle performance. Moreover, new measurement techniques are needed to analyze impact of engine oil on PM emission characteristic, composition, and morphology. In this research, various analytical instruments are applied to verify engine oil effect on particulate matter, with DPF equipped Euro 5 CRDI engine. physical and chemical analysis with SEM, EDS and XPS are accomplished to quantify the engine oil contribution on PM composition that are sampled onto various filters using specially designed PM sampling equipments.
대기 온도가 승용 디젤 차량의 실시간 NOx 및 입자상물질 배출특성에 미치는 영향에 대한 연구
손정훈(Jeonghun Son),시우성(Woosung Si),진동영(Dongyoung Jin),명차리(Cha-Lee Myung),박심수(Simsoo Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The Light-duty Vehicle at the low ambient temperature can have a many of effect on drivability and fuel economy. Also, it is extremely high compared to ambient temperature in the diesel engine exhaust emission levels. Because of increased oil viscosity, low cylinder wall temperature, low intake air temperature and increased fuel viscosity, exhaust emission level on the light duty vehicle at the low ambient temperature increase NOx emission and particular matter emission level. Exhaust gas recirculation (EGR) is especially effective in reducing the NOx emission. In the research, a EGR system is added to a 1.6L turbocharged VGT diesel engine. This vehicle satisfy the Euro 5 regulation. This paper examines effect of low ambient temperatures on real-time NOx and particle emissions characteristics from a Light-duty Diesel Passenger Vehicle.
터보직분사 가솔린 엔진에서 저속 조기점화 (LSPI) 방지를 위한 주요 인자 고찰
임기훈(Gihun Lim),시우성(Woosung Si),엄믿음(Midyeum Eum),노성훈(Seonghun Noh),김재진(Jaejin Kim),박문호(Munho Bak) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Low speed pre-ignition (LSPI) is one of the difficult issue in the turbocharged gasoline direct injection (GDI) engine. Pre-ignition is a kind of heavy knock of which pressure rise starts before ignition by spark plug. High load/low speed condition at high ambient temperature has risk of going into LSPI which makes engine damage such as spark plug and piston and big accident. In this study, the effects of valve timing, start of injection, lambda, and ignition timing on knock/PI characteristics have been investigated to protect LSPI. Knock/PI intensity and frequency could be restrained by valve overlap increase, late injection, rich air/fuel mixture, and retarded ignition timing. Valve overlap increase was one of excellent method to suppress the knock/LSPI without torque reduction.