基于模糊控制的纯电动汽车加速输出转矩优化控制策略

Output Torque Optimum Control Strategy of Pure Electric Vehicle(PEV) in Acceleration Based on Fuzzy Control

为使纯电动汽车加速时的输出转矩充分符合驾驶员加速意图,设计了常规、动力、经济等3种驾驶模式供驾驶员手动选择。常规模式下,基于线性稳定驱动转矩控制策略确定基本输出转矩;动力模式下,采用模糊控制算法以加速踏板开度及其变化率为输入,动力优化转矩为输出,对基本输出转矩作增矩优化;经济模式下,采用模糊控制算法以电机转速和加速踏板开度为输入、经济优化转矩为输出,对基本输出转矩作减矩优化。仿真结果表明,上述控制策略可以很好地反映驾驶员加速意图,达到不同模式下所期望的控制目标。

To make the accelerating output torque of pure electric vehicle (PEV) fully accord with driver’s intention, we design three driving modes for drivers, i.e. normal mode, dynamic mode and economic mode. In the normal mode, basic output torque could be determined based on linear stationary driving torque control strategy. In the dynamic mode, fuzzy control algorithm utilizes the accelerator pedal position and its change rate as the input, the dynamic optimal torque as the output, increasing the basic driving torque. In the economic mode, fuzzy control algorithm utilizes the accelerator pedal position and motor speed as the input, the economic optimal torque as the output, decreasing the basic driving torque. The simulation result shows that the above control strategy accords well with driver’s intention, achieving the desired control purpose in each mode.