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가변 밸브 타이밍(VVA) 기구를 이용한 차세대 연소방식의 연구
현기수(Gisoo Hyun),정찬승(Chansung Chung),두병만(Byungman Doo),구영곤(Younggon Ku) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For this study, a Premixed Charged Compression Ignition (PCCI) Combustion was applied in a Heavy duty Diesel Engine, and has been experimentally investigated from the standpoint of its operating area extension to higher loads and engine performance, such like fuel consumption and emission, improvement. A Variable Valve Actuation (VVA) system was adopted to change the variables of intake and exhaust valve system such like opening, closing timing and valve lift profile. For controlling combustion timing which is a major difficulty for PCCI combustion engine realization, intake vale opening timing was advanced or retarded, and accordingly the effect of Miller cycle was evaluated. As a result, an ideal combustion can be achieved under controlling ignition timing and reducing effective compression ratio by using VVA system.
류택용(Taekyong Ryu),김성수(Sungsoo Kim),김동호(Dongho Kim),두병만(Byungman Doo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
EGR (Exhaust Gas Recirculation) is an effective measure for reduction of exhaust emission but thermal load is increased. In this study, the effects of EGR on engine thermal load, cylinder metal temperature, heat balance and performance were investigated in a commercial diesel engine.