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오경철(Kyoungcheol 0h),김달철(Talchol Kim),김철수(Chulsoo Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Fuel economy of a hybrid electric vehicle (HEV) is directly related to operation algorithm. In this paper, operation algorithms for a parallel HEV equipped with relatively small motor are investigated to achieve minimum fuel consumption. Generally, the HEV with relatively small motor adopts a power assist algorithm in which the motor is used to assist the engine power. In order to obtain minimum fuel consumption, an equivalent fuel algorithm is proposed. In this algorithm, the electrical energy stored in the battery is considered to be an equivalent fuel and an equivalent brake specific fuel consumption (ebsfc) for the electrical energy is proposed, which is a function of the battery state of charge (SOC). In addition, in order to maintain the battery sac, weight factors are suggested. It is found from the simulations that the equivalent fuel algorithm shows almost same fuel economy and battery SOC compared to those of the power assist algorithm.