关键词: 电动汽车, 能量分配, 锂电池, 超级电容, 模糊逻辑

Abstract: The scheme of ultracapacitor/lithium battery hybrid power supply for pure electric vehicle is an effective method to solve the problem of its dynamic performance and economy, but the energy dispatching strategy of the dual energy electric vehicle is close related to its performances, such as energy efficiency of the entire vehicle and the safety of the battery. Therefore, a hybrid electric vehicle testbed with LiFePO4 battery packs(B) and ultracapacitors(C) was studied in this paper. Firstly, the model of the testbed was developed in ADVISOR. Then, an energy dispatching strategy was proposed based on fuzzy logic, and compared with the strategy based on logic threshold in the discharge current, power of battery, energy recovery and energy consumption etc. The simulation and test results show that the hybrid electric vehicle with fuzzy logic energy dispatching strategies can get better performances in the vehicle’s dynamic performance, economy and battery’s safety so on.

Key words:  EV, energy dispatching, lithium battery, ultracapacitor, fuzzy logic