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Tier2Bin5 대응 NOx Storage Catalyst 적용 2.2L 디젤 엔진에서의 에미션 개발
이명준(Myungjun Lee),이흥우(Hyeungwoo Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The LNT(Lean NOx Trap) system has been developed for NOx reduction to meet Tier2 Bin5 by using the modified R-2.2 standard Engine. The rich mode combustion in the engine has been developed for the wide operating range despite of low compression ratio. It can be accomplished by adjusting air and FIE system, mainly by increasing attached-post-injection quantity. The A/F (Air/Fuel) ratio has been sustained by controlling the attached-post-injection quantity. The neutral transition between lean mode and rich mode combustion has been completed. The change in noise and torque cannot be recognized by the driver during the transition of combustion mode (lean/rich/lean). The transition procedure has been finished within about 1s for whole operating range. The regeneration pattern decides where the rich mode should be realized. It has been calibrated for FTP test mode to obtain proper NOx conversion rate to meet Tier2Bin5 considering the fuel penalty and THC slip. The total rich mode time during FTP mode was around 30s and the NOx conversion rate of 92% has been realized with bench aged NSC(NOx Storage Catalyst) appropriate to 50k mileage.
DFSS시험기법을 이용한 저압축비 HSDI 디젤 엔진의 냉시동성 개발
최회명(Hoimyung Choi),노홍진(Hongjin Noh),이흥우(Hyeungwoo Lee),지요한(Yohan Chi),윤금중(Kum Jung Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A new process was proposed for developing the idle stability under cold starting of passenger car HSDI diesel engine. Injection parameters were successfully optimized for the starting time and the idle stability of 1.5 liter HSDI diesel engine at -25℃ through this process which includes the DFSS experimental method. The THC exhaust emission was measured during cold start and utilized for index of white smoke.
신범식(Buomsik Shin),허행표(Haengpyo Heo),이흥우(Hyeungwoo Lee),지요한(Yohan Chi),윤금중(Kumjung Yoon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engine has been attractive for its high thermal efficiency. As the CO₂ reduction is strongly requested. diesel engine is considered one of the most realistic solutions in the transport system. However, clean diesel engine cannot be developed without advanced technologies to comply with the stringent emission law. Therefore, currently much of researches are focused on how to reduce the diesel engine emission in the engine itself as well as after-treatment. Although new techniques are effective to the emission reduction, their application is carefully approached. This is because the new techniques have positive and negative effects in terms of fuel and cost economy. In this paper, several techniques are presented and their characteristic behaviors are discussed for the small displacement volume passenger diesel engine. Then, emission potential is estimated with the DOE optimization for the next staged regulation such as EU5.
유럽시장 대응을 위한 촉매형 매연 여과 장치 매핑 전략
허행표(Haengpyo Heo),박성근(Sunggeun Park),이흥우(Hyeungwoo Lee),지요한(Yohan Chi),윤금중(Kumjung Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Increasing demands for clean air and better fuel consumption have led to the greater penetration of diesel passenger cars equipped with diesel particulate filters. In order to drastically reduce the particulate emission in all the engine operating conditions Catalyzed particulate filter has been developed for serial passenger cars. The exhaust gas temperature required for the filter regeneration was found to be achievable in all driving situation through a smart management of up to five multiple injections and air mass without an unacceptable increase of fuel consumption or noticeable change in vehicle drivability. The features and performance of the control system and engine, aftertreatment developed are presented in this paper.