电动汽车的加速转矩补偿控制策略

Strategy of Acceleration Torque Compensation Control for Electric Vehicle

为了解决电动汽车在急加速和急起动时电机输出动力不足难以满足驾驶员对动力需求的问题,在对汽车加速过程力矩特性分析的基础上提出了一种加速转矩补偿控制策略。该策略可在线性稳定的驱动力矩控制策略的基础上确定基本驱动力矩。采用模糊控制算法开发了以加速踏板开度及其变化率为输入、目标扭矩增量为输出的驾驶员意图表达控制器。在此基础上设计了加速转矩补偿算法用于计算补偿扭矩。最终确定了驾驶员的转矩需求并向电机驱动系统发出了转矩控制指令。仿真结果表明,该控制策略能够显著提升电动汽车的加速性能。

In order to solve the problem of motor output power shortage of electric vehicle during urgent acceleration and start,which is difficult to satisfy the demand of driver for the need of power,an acceleration torque compensation control strategy was proposed based on analysis of the torque characteristics during vehicle acceleration.In the strategy,basic driving torque could be determined on the basis of linear stationary driving torque control strategy.Fuzzy control algorithm was adopted to develop a driver intention expression controller,which utilized the accelerator pedal position and its change rate as the input,and the target incremental torque as the output.Then,the acceleration torque compensation algorithm was designed to calculate compensation torque.Finally,the torque requirement of the driver was determined and the command of torque control was sent to motor driving system.The simulation result shows that the control strategy could significantly improve the acceleration performance of electric vehicles.