增程式电动校车动力传动系统匹配设计

The Power Transmission System Matching Design of the Extended-electric School Bus

针对校车的行驶特点,采用与北京城市公交工况类似的德国纽伦堡循环工况下的整车能耗量作为经济性评价指标,通过加权原地起步加速时间作为动力性评价指标来评价动力传动系统的匹配。在Simulink里用仿真模型代替传统燃油经济性目标函数的繁琐编程,采用多目标优化遗传算法NSGA-II,利用ISIGHT与MATLAB/Simulink联合仿真,对增程式电动校车的传动比进行动力性和经济性的双目标优化。通过与车辆初始设计传动比相比较,结果表明,优化后的传动比,能够有效提高车辆的动力性和经济性。

In the light of the driving feature of school bus, this paper selects the Nuremeber＇s vehicle energy consumption, similar to urban bus in Beijing, as the economic evaluation index andthe accelerating time as the dymamic evaluation index to evaluate the matching of the power-transmitting system. In the Simulink, the simulation model is used to replace the tedious programming of the traditional fuel economically objective function, the multi-objective optimization genetic algorithm NSGA-11 is selected, ISIGHT and MATLAB cosimulation is taken advantage, and the transmission ratio of extended-electric school bus of the double objective optimization of power and economy is conducted. By comparing with the initial design transmission ration of the vehicle, the results show that the optimized gear ration can effectively improve the power and economy of the vehicle.