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양시우(Siwoo Yang),김남욱(Namwook Kim),박영일(Yoengil Park),임원식(Wonsik Lim),차석원(Sukwon Cha),양호림(Horim Yang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Power split HEV systems such as THS have several control variables. Contrary to conventional internal combustion vehicles when torque is inputted from a driver at specified vehicle speed, torques and speeds of engine and two motors should be determined. There is a relationship between variables that satisfies required output state, however solutions show considerably different fuel efficiency with changing Battery SOC. To find optimal control values, firstly calculates the efficiency of a HEV system composed of one engine, two motors and a planetary gear system. The efficiency of a HEV system includes engine efficiency, motor efficiency and power recirculation. Based on the constructed system efficiency map, optimal points can be determined with fixing a SOC level at specific output state. Then the only remained task which is changeable at discretion is determining SOC levels. By dynamic programming the optimized SOC path can be obtained easily. The results of this simulation shows some tendencies that are applicable to a cruising control strategy.