增程式电动客车动力系统集成与匹配分析

Power System Integration and Matching Analysis of Extended Range Electric Bus

增程式电动客车具备一定里程纯电行驶和长距离增程行驶的特点,能缓解纯电动客车里程忧虑问题。文章针对市场需求和实际应用场景,对增程式电动客车动力系统中的驱动电机、动力电池、增程器总成等核心部件进行了性能匹配设计,并在MATLAB-Simulink软件平台中建立整车动力系统动力学模型。基于纯电为主、增程为辅的使用特点,制定了增程式动力系统总体工作策略,而后对常用车速巡航维持功率、高速巡航维持功率进行计算,并对中国重型商用车辆行驶工况(CHTC-C)下增程器输出功率与动力电池能量变化进行仿真分析,结果表明增程器输出功率越小,需要动力电池补偿的驱动能量越多,当达到某一经济功率时动力电池电量基本平衡。相比于传统单一工况匹配增程器功率的方式,文章考虑特定场景具体需求,并对多种工况下增程器经济功率和最大输出功率进行分析,为增程器选型及后续功率跟随策略的完善提供了思路。

Extended range electric bus have the characteristics of pure electric driving and long-distance extended range driving,which can alleviate the concern of pure electric bus mileage.According to the market demand and practical application scenarios,the performance matching design of the drive motor,power battery,range extender-assembly and other core components of the extender-range electric bus power system is carried out in this paper,and the dynamics model of the vehicle power system is established in the software platform of MATLAB-Simulink.Based on the use characteristics of pure electricity as the main and extended range as the auxiliary,the overall working strategy of the extended range power system is formulated,and then the cruise maintenance power at common speed and at high speed is calculated,and the output power of the range extender and the energy change of the power battery are simulated and analyzed under the China heavy-duty commercial vehicle test cycle-city coaches(CHTC-C)integrated working condition.The results show that the smaller the output power of the range extender,the more drive energy needed to be compensated by the power battery.When reaching a certain economic power,the power of the power battery is basically balanced.Compared with the traditional way of matching range extender power under a single working condition,this paper analyzes range extender power under multiple working conditions considering the specific needs of specific scenarios,providing ideas for the selection of range extender and the improvement of subsequent power follow strategy.