电动汽车复合电源控制策略

Control Strategy of Hybrid Electric Vehicle

针对电动汽车行驶里程短和复合电源系统中功率分配的问题,提出了逻辑门限控制策略和模糊逻辑控制策略对复合电源系统进行研究,使蓄电池向电机提供平均功率,超级电容向电机提供瞬时功率和峰值功率。基于常规复合电源模糊控制模型,考虑电机制动和液压制动共同为电动汽车提供制动力,建立新型复合电源系统模糊控制模型。实验结果表明:复合电源相对于单一蓄电池电源在电池SOC、能量回收率和电动汽车行驶里程有很大提升,模糊控制策略相对于逻辑门限控制策略提高了超级电容利用率并且降低了电池电流幅值,更好地保护了蓄电池。

Regarding the problem of the short range of electric vehicles and the power allocation in hybrid power supply system,the logic threshold control strategy and fuzzy logic control strategy are proposed to study the hybrid power supply system,where the battery provides the average power to the motor,and the super capacitor provides instantaneous power and peak power to the motor.Based on the traditional fuzzy control model of the hybrid power supply,a new fuzzy control model is proposed to provide the braking force for the electric vehicle,in which motor brake and hydraulic brake together to provide braking force for electric vehicles.Experimental results show that,hybrid power supply with respect to a single battery power has been greatly improved in the battery SOC,energy recovery and the range of electric vehicles.Compared with the logic threshold control strategy,the fuzzy control strategy improves the utilization ratio of the super capacitor and reduces the amplitude of the current of the battery,therefore the fuzzy control strategy can protect the battery better.