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기체분사 LPG 연료 공급 시스템에서 연료성분에 따른 연료 분사량 변화 연구
박영표(Youngpyo Park),이범호(Beomho Lee),김철숙(Chulsuk Kim),이대엽(Daeyup Lee),최윤재(Yoonjae Choi),이병직(Byoungjik Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to meet more stringent emission regulations for SULEV, precise injection of fuel in terms of amount and timing is very critical. For improvement of the performance when the vehicle is cold started, 30% max. propane is added to butane depending on season and local climate in Korea. LPG fuel property varies with propane composition, which leads to change of air fuel ratio, caloric value, combustion characteristics etc. Due to change of fuel composition, the amount of fuel injection, fuel properties and combustion conditions are varies. It needs to be investigate injection model in a gaseous LPG injection system to precise injection control.
임윤성(Yunsung Lim),박준홍(Joonhong Park),강대일(Daiil Kang),김지영(Jiyoung Kim),박영표(Youngpyo Park),서충열(ChoongYeol Seo),이종태(Jongtae Lee),김정수(Jeongsoo Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Hydrocarbons which are the main sources of VOCs from motor vehicles are emitted not only from the exhaust but also from evaporation of the fuel in storage and supplying systems. The important parameters to affect evaporative emissions are air and fuel temperature and fuel vapor pressure. Diurnal loss rises exponentially as air temperature and vapor pressure increase. The effects of vapor pressure on running loss are different as the capacity of canister. Tests with simulating real temperature and driving conditions show that hydrocarbons in evaporative emissions are more than that in exhaust gas in summer season because of the higher air temperature. The BTEX analysis of VOCs shows that toluene is the most emitter and benzene is the next and that photochemical ozone creation potential gets lower as vapor pressure decrease.
5.9리터급 LPG MPI 엔진에서 희박 연소 특성의 향상
곽용환(Yonghwan Kwak),이범호(Beomho Lee),이대엽(Daeyup Lee),박영표(Youngpyo Park),홍성태(Sungtae Hong) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In medium and heavy duty engines for vehicles heavier than 3.5 tons(GVW), an implementation of lean burn technology is very important to lower thermal load and enhance fuel economy. To meet EURO-5 emission regulations, the optimized emission characteristics are also important design factors. In this work, with lean burn technology, a swirl enhancing valve was used in the intake port to improve combustion. Also, the injection position was varied to see its effect on stratification of air fuel mixture, which thus may enhance lean burn characteristics. This work concludes that, when the fuel was injected toward tumble port, the COV became flat over the wider range of ignition timing and the exhaust temperature was lowered. And, with tumble port injection, the torque was slightly increased and there exist conditions where NOx was reduced at the same level of torque compared with the baseline case.