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주행 조건이 하이브리드 자동차의 연비에 미치는 영향 연구
김강출(Gangchul Kim),표영덕(Youngdug Pyo),이영재(Youngjae Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This is a study to analyze the influence of driving condition on fuel economy for hybrid electric vehicle. In order to accomplish this, vehicle speed, engine speed, battery current and voltage, SOC (state of charge), motor speed and torque, generator speed and torque, engine coolant temperature etc. were measured in real time. The tests were carried out under different driving cycles which are UDDS (Urban Dynamometer Driving Schedule), HWFET (Highway Fuel Economy Test), KOREA CITY mode and on-road driving, and also under various test conditions such as different initial SOC (SOC 40%, SOC 56%, and SOC 80%), with or without regenerative braking, and different engine starting conditions (cold start or hot start). Generally, conventional gasoline engines show a poor fuel economy at stop and go driving conditions, because braking energy is wasted and the engine is operated mainly in low efficiency areas. However, as hybrid vehicles are controlled at the maximum engine efficiency region by a combination of both motor and engine, and also utilize the regenerative braking, thus, the effects of driving cycles on fuel economy is minor.
바이오디젤의 혼합율에 따른 디젤차량의 연비 및 배출가스 영향 연구
김강출(Gangchul Kim),표영덕(Youngdug Pyo),이영재(Youngjae Lee) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Over the past several years, there has been increased interest in reformulated and alternative diesel fuels to control emissions and provide energy independence. Biodiesel, which can be generated from natural renewable sources such as new or used vegetable oils or animal fats, may have the potential to reduce our nation's reliance on imported oil and to improve air quality. In addition, it is compatible with diesel fuel in compression ignition engines, meaning that an existing diesel engine can be fueled by biodiesel blends. In this paper, the test results of fuel economy and exhaust emissions of neat diesel oil, neat biodiesel and biodiesel blends (20 vol. % biodiesel and 50 vol. % biodiesel) are presented using three conventional diesel-engine vehicles. Chassis dynamometer tests showed that PM, Smoke, THC and CO emissions were decreased as the blending rations of biodiesel to diesel oil increased, on the other hand NOx emission was slightly increased because of the oxygen content in biodiesel. Also, the biodiesel blends yielded lower fuel economy than that of diesel oil because of lower hearting value of biodiesel.
소형 리니어 엔진에서 LPG와 수소 연료에 따른 운전 특성 비교
김재헌(Jaeheun Kim),배충식(Choongsik Bae),김강출(Gangchul Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A prototype of small-sized, spark ignition free piston engine combined with a linear alternator was designed and built, which is used to produce electric power for portable usage. Engine performance including indicated mean effective pressure and piston velocity were compared for hydrogen and liquefied petroleum gas. The total lower heating value of two fuels per unit time was maintained equal to compare the combustion and operation characteristics of each fuel. Effects of alternator load to the engine performance were observed. The combustion characteristics such as heat release rate, cycle-tocycle variation and the power output of two fuels were studied. Hydrogen resulted in stable operation due to its faster flame speed and wider flammability range, while LPG showed higher cycle-to-cycle variation and misfire in some cycles. Under the same alternator load, hydrogen resulted in better power output than LPG, because hydrogen had more energy released from the fuel than LPG, which is modified from the accumulated heat release analysis. As the load increased, operation with LPG showed higher possibility of engine operation failure due to misfire, which is mainly caused by the inappropriate combustion condition accompanied by the piston motion. Meanwhile, hydrogen showed a large operation range with various load conditions.