도로의 경사도 정보를 이용한 하이브리드 연료 전지 자동차의 적응 룰 기반 전력 분배 전략

Fuel cell is being considered as an alternative power source, which can replace the conventional combustion engine. However it has some drawbacks such as low power density and inability of energy recovery. Therefore Fuel cell hybrid electric vehicle (FCHEV) technology has been widely studied in recent years in order to overcome these drawbacks of fuel cell vehicle (FCV). In a FCHEV, the fuel cell stack is assisted by one or more energy storage systems such as battery and super-capacitor. Power distribution between fuel cell and battery is most important for both improving the fuel economy and maintenance of battery’s state of charge (SoC) at reasonable level. In this paper, Adaptive rule-based controller for power distribution of FCHEV is proposed. Simple rule-based controller with constant thresholds can’t guarantee the performance for unexpected terrain (uphill, downhill) because the battery needs to provide relative large amount of power. Therefore proposed adaptive rule-based controller uses road slope information to vary threshold in order to distribute the propulsive power for battery. To verify the improvement in vehicle fuel economy and maintenance of SoC, optimal vehicle fuel economy and target trajectory of SoC by using dynamic programming is used.