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Engine Warm-up 기간의 Zero Coolant 적용에 관한 연구
조원준(Wonjoon Cho),최경욱(Kyungwook Choi),김형익(Hyungik Kim),이기형(Kihyung Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, there has been an interest in intelligent cooling system as it has the potential of achieving a better fuel economy and emission reduction. It is possible mainly due to the higher coolant temperature during engine warm-up and low speed/part-load conditions. Thus the purpose of our study was to investigate the relationship between zero coolant strategy and fuel consumption. A coolant flow test system was set for acquisition of coolant flow rate, pressure distribution and coolant temperature. Thease results were used for experimental data to validate the 1-D CFD code, Flowmaster2. From this study, we found that the zero coolant strategy improved fuel economy and emission reduction on the engine warm-up, and this results can be used for engine cooling system simulation model.
바이오 디젤과 디젤 연료의 혼합비율에 따른 연소 및 배기 특성 연구
한준섭(Joonsup Han),김영진(Yungjin Kim),김형익(Hyungik Kim),이기형(Kihyung Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
As the problems of environmental pollution and energy depletion become more severe, strict emissions regulations have been adopted in many countries. The use of bio-diesel fuel is a common solution to these problems because they have many advantages. In this paper, we investigated the effect of the mixing rate of bio-diesel and diesel fuel on the fuel quantity, combustion characteristics and emission characteristics in four cylinder CRDI diesel engine. As result of fuel quantity measurement, Bio-diesel injection quantity is a little bit different compared to diesel fuel. Most of BSFC value is same at the condition of NEDC 12mode. But, NOx emission is increased. Mixing rate of bio-diesel and diesel fuel that is lower CO₂ and PM emissions than diesel fuel.