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오경철(Kyoungcheol Oh),김동현(Donghyun Kim),이희라(Heera Lee),김현수(Hyunsoo Kim),김달철(Talchol Kim),김철수(Chulsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In this paper, operating algorithms are investigated for a parallel hybrid electric vehicle (HEV). In order to estimate the performance of the HEV, a HEV simulator is developed using MA TLAB SIMULINK. Simulations are carried out for the following three algorithms: (1) power assist, (2) equivalent fuel and (3) power distribution. The simulation results show that the equivalent fuel and power distribution algorithm do not provide an improvement of the fuel economy due to the decreasing battery SOC. It is found that the power assist algorithm is best suited for a parallel HEV studied, which consists of relatively small motor and battery.
병렬형 하이브리드 전기자동차의 엔진/모터/배터리 용량 및 운전전략 최적화
오경철(Kyoungcheol Oh),최동훈(Donghun Choi),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The core technology of hybrid electric vehicle is to reduce fuel consumption and emissions. In order to analyze the HEV performance, it is carried out mathematical modeling of the HEV powertrains and development of the HEV performance simulator. This paper presents optimum power distribution ratio between the engine and the motor is obtained which minimizes the objective function by the penalty function method. An objective function is suggested, which consists of total engine fuel consumption and total electric energy. It is found from the optimization results that the optimal power distribution ratio can be obtained easily compared with those by the existing trial and error design method. An optimization process is proposed to determine the engine/motor/battery size to obtain the minimum fuel consumption while satisfying vehicle acceleration performance and an optimization process of HEV control strategy using the results determined in the first optimization process.
박창훈(Changhun Park),오경철(Kyoungcheol Oh),김동현(Donghyun Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, operation algorithms are evaluated for a fuel cell hybrid electric vehicle(FCHEV). Power assist, load leveling and equivalent fuel algorithm are proposed and implemented to the FCHEV performance simulator. It is found from the simulation results that the load leveling algorithm shows poor fuel economy due to the system charge/discharge efficiency. In the power assist and equivalent fuel algorithm, the fuel cell stack is operated in relatively better efficiency region owing to the battery power assist, which provides the improved fuel economy.<br/> <br/>
42-volt ISG 차량의 운전전략 및 성능 시뮬레이터 개발
김정민(Jeongmin Kim),오경철(Kyoungcheol Oh),이재호(Jaeho Lee),김종대(Jongdae Kim),김현수(Hyunsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, an operation algorithm and a performance simulator are developed for a 42-volt system vehicle which consist of 5 Kw ISG, 2500㏄ IC engine, torque converter and 4 speed automatic transmission. Modular approach method using MATLAB Simulink is used to get a Dynamic Model of the vehicle powertrain which is obtained from each component such as engine, battery, ISG, torque converter, etc. An ISG control strategy is proposed to apply the use of the function such as engine idle stop and regenerative braking. It is found that the fuel economy can be improved as much as 6 percent for FTP75 driving cycle owing to the engine idle stop and regenerative braking.