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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.
김강출(G.C.Kim),권오석(O.S.Kwon),김종필(J.P.Kim),고창조(C.J.Koh),박선(S.Park),이영재(Y.J.Lee),방효선(H.S.Bang),한정옥(J.O.Han) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Natural gas is one of the most promising alternative fuels for automotive vehicles, because it can reduce exhaust emissions than gasoline and diesel fuels, and can be used in conventional engines with a little modification. However, natural gas varies in composition between the originating fields and may be further modified due to processing prior to transmission. These variations are known to affect engine performance and emissions through changes in fuel metering characteristics and knock resistance of the fuel.<br/> The objective of this study is to examine the effect of natural gas composition on vehicle performance such as fuel economy, driveability and exhaust emissions. Analysis are made of using 6 types of natural gas fuels, which are selected in consideration of the variation in fuel composition on the worldwide market. These results may be utilized to develop natural gas engine and/or to establish the fuel standard in refuelling station.<br/>
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.