前、后轴双电动机驱动纯电动客车的转矩分配策略

Torque distribution strategy of pure electric bus with double motors driving by front and rear axles

针对驱动防滑策略与转矩最优分配策略的协调问题,基于实时粒子群优化算法,提出一种综合考虑车辆稳定性和经济性的综合转矩分配策略.以滑移率为控制目标的驱动防滑策略输出前、后轴转矩指令限值.以实时优化为优化方法的粒子群算法通过将驱动防滑策略输出的前、后轴转矩指令限值作为动态约束条件,使转矩最优分配策略可以在驱动防滑策略生效时正常运行.基于AVL-Cruise与Simulink平台,建立了整车经济性联合仿真模型,对综合转矩分配策略的优化效果进行分析.结果表明:在选择的3种循环工况下,100 km电耗平均减少了4.79%,续驶里程平均提高了5.49%,综合转矩分配策略在保证客车纵向稳定性的前提下,改善了燃油经济性.

To solve the coordination problem between the driving anti-skid strategy and the optimal torque distribution strategy,based on the real-time particle swarm optimization algorithm,a comprehensive torque distribution strategy with the consideration of stability and economy of vehicles was proposed.The driving anti-skid strategy with slip rate as control target could output the front and rear axle torque constraints.By the particle swarm optimization with real-time optimization as optimization method and with front and rear axle torque constraints as dynamic constraint condition,the optimal torque distribution strategy could run normally when the anti-skid strategy took effect.Based on AVL-Cruise and Simulink platform,a joint simulation model of vehicle economy was established to analyze the optimization effect.The results show that under the three selected cycle conditions,the power consumption per hundred kilometers is averagely decreased by 4.79%,and the driving mileage is averagely increased by 5.49%.The comprehensive torque distribution strategy can improve the fuel economy on the premise of ensuring the longitudinal stability of bus.