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엔진배출 나노PM 입자계측용 응축핵개수기(CPC) 특성 비교 해석
정민원(Minwon Jung),이진욱(Jinwook Lee),정용일(Yongil Jeong),차경옥(Kyungok Cha),윤진욱(Jinuk Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the nano-PM 's number concentration emitted by diesel internal combustion engine has focused on attention because this particulate matters are suspected being hazardous of human health. In this study, the particulate matters (PM) emissions of these vehicles were investigated by number concentration. A condensation particle counter (CPC) system was applied to measure the particle number and size concentration of diesel exhaust particles at the end of dilution tunnel along the NEDC(ECE15+EUDC) vehicle test mode using TSI 3010D and HCT 4312 CPC. As the research result, the characteristic of CPC comparison diesel nano-particle number and size distribution was investigated in this study.
Urea-SCR 촉매가 코팅되는 전기히터 시스템의 NOx저감 성능에 관한 연구
최현하(Huunha Choi),김홍석(Hongsuk Kim),정용일(Yongil Jeong),임인혁(In-hyuk Im),박정한(Jeonghan Park),황재원(Jae-Won Hwang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is well known that a urea-SCR system can reduce NOx emissions of a diesel engine effectively. But the urea-SCR technology does not shows a good NOx reduction performance at low temperature exhaust gas conditions. This study introduces a newly developed urea-SCR catalyst coated electrical heater system. This system can reduce NOx emissions of a diesel engine effectively even though at low temperature exhaust gas conditions by increasing the surface temperature of SCR catalyst electrically. The study compares the NOx reduction performance of the newly developed urea-SCR system with a conventional system. This study shows that the new urea-SCR system has high performance and low NH₃ slip at the low temperature exhaust gas conditions.
오진우(Jinwoo Oh),김홍석(Hongsuk Kim),이석환(Seokhwan Lee),정용일(Yongil Jeong) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, a few ultra lean burn GDI(Gasoline direct injection) engines showing good fuel economy have been introduced in the market. The BMW N53 GDI engine is one of these engines, and its ultra lean burn strategy was investigated in this study. The BMW N53 engine uses a spray-guided lean burn concept. In this engine, piezo injectors are located at the center of combustion chamber to form stratified mixture in the vicinity of spark plug. This study showed that brake specific fuel consumption rate is reduced about 11% to 25% by lean combustion mode compared with the homogeneous combustion mode. Spark timing was retarded with the increase of BMEP at the homogeneous combustion mode, but it was fixed at BTDC 15° CAD at the lean combustion mode. This study also showed the fuel injection and valve train strategies for lean combustion of the engine.