分布式驱动电动汽车经济性转矩优化分配策略

Research on Optimal Torque Distribution Strategy for Distributed Drive Electric Vehicle

针对分布式驱动电动汽车,本文提出一种以经济性为目标的驱动轮转矩优化分配策略,该控制策略首先基于模糊控制识别驾驶意图,获取整车需求扭矩,然后以整车驱动能耗最优为目标,基于动态规划算法离线计算前、后轴电机经济性转矩分配系数,从而在保证计算速度的同时提高车辆的经济性。最后,Carsim/Simulink联合仿真结果表明,本文所提出的驱动轮转矩控制策略有效改善了驱动电机的工作效率,在循环工况测试中,动力电池SOC增加了0.27%,能量消耗降低了4.19%,提高了车辆的经济性能。

This paper proposed an drive torque distribution optimization strategy aiming at economy for the distributed drive electric vehicle.Firstly,this control strategy identified the driving intention based on fuzzy control and obtained the required torque of the whole vehicle.Then,this strategy took the optimal driving energy consumption of the whole vehicle as the goal,and obtained the economic torque distribution coefficients of the front and rear axle motors through offline calculation based on the dynamic programming algorithm,which ensured the calculation speed and improves the economy of the vehicle.Finally,Carsim/Simulink showed that the proposed strategy in this paper effectively improved the working efficiency of the drive motor and the economic performance of the vehicle.The SOC of the power battery is increased by 0.27%and the energy consumption is decreased by 4.19%in the cycle test.