基于效率优化的四轮独立驱动电动车转矩分配

Torque Distribution Based on Efficiency Optimization of Four-wheel Independent Drive Electric Vehicle

对某款四轮独立驱动电动汽车转矩分配控制策略对车辆经济性影响进行研究,基于理论与试验数据,建立关键零部件数学模型及整车能耗的MATLAB/Simulink仿真计算模型.以降低系统能耗为目标,提出一种基于驱传动系统效率优化的转矩分配控制策略,得到转矩分配系数MAP图,从而避免了在线计算的时效性问题.不同行驶工况下的仿真结果表明,与固定比例的转矩分配方法相比,基于转矩分配优化算法的系统能耗可降低约5%.

The effect of torque distribution control algorithm on the vehicle economy of a four-wheel-drive electric vehicle was investigated.Mathematic models of key components were established based on theory and test data,and a simulation model of vehicle energy consumption was set up with MATLAB/Simulink software.To reduce the system energy consumption,a torque distribution control algorithm based on the system efficiency optimization was proposed.A torquedistribution-coefficient map was obtained,which avoided the timeliness problem of on-line computation.Compared with the energy consumption of fixed coefficient algorithm,simulation results illustrate that the overall energy consumptions of optimal torque distribution decrease approximately by 5%in different driving cycles.