电液混合动力城市公交车控制策略研究

Research on Control Strategy of Electro-hydraulic Hybrid City Bus

针对城市公交车电池寿命短、续航里程低的问题,提出了一种电液混合动力系统,并针对此系统设计了一种基于规则的控制策略,确定了公交车的相关参数,对混合动力系统的关键元件进行了选型,使用AMESim软件搭建了电液混合动力系统仿真模型和控制策略仿真模型,结果表明:所提出的电液混合动力系统电池提供大电流的次数减少了60%,续航里程相较于原系统增加了25%,验证了控制策略的有效性。对系统切换工作模式时耦合转矩出现波动的现象进行了研究,结果表明:通过选择合适的泵/马达结构参数可以减少耦合转矩的波动,以提高模式切换过程中整车动力传递的平稳性。

Aiming at the problems of short battery life and low mileage of city bus,an electro-hydraulic hybrid power system is proposed,and a rule-based control strategy is designed for this system.The relevant parameters of the bus are determined,and the key components of the hybrid power system are selected.AMESim software is used to build the simulation model of the electro-hydraulic hybrid power system and the control strategy simulation model.The results show that the number of times that the battery of the proposed electro-hydraulic hybrid power system provides large current is reduced by 60%,and the mileage is increased by 25%compared with the original system,which verifies the effectiveness of the control strategy.The phenomenon of coupling torque fluctuation during system mode switching is studied.The results show that the fluctuation of coupling torque can be reduced by selecting suitable pump/motor structure parameters,so as to improve the smoothness of vehicle power transmission during mode switching.