基于动力性与经济性的两挡纯电动汽车传动比优化

Gear Ratio Optimization of Two-speed Electric Vehicles Based on Power and Economy

为实现纯电动汽车动力系统高效匹配,充分发挥关键部件的最大效用,以实现整车动力性与经济性最佳为目标进行研究,通过对纯电动汽车行业标准和整车参数的收集整理,确定XH2型纯电动汽车基本性能参数,根据前期已做的整车匹配选型工作,确定以动力系统传动比为优化变量的优化方案,利用matlab软件建立动力系统多目标优化数学模型,设定目标函数,引入4种非线性求解方式对模型求解。对比分析结果,得到该车的最佳传动比方案,该方案使整车动力性改善明显,经济性略有提高。

In order to realize the efficient matching of the pure electric vehicle powertrain system and maximize the utility of the key components, the optimization of the vehicle power and economy is studied. Through the analyses of the industry standards for elec-tric vehicles and vehicle parameters, the basic performance parameters of XH2 electric vehicle are determined. The optimization scheme that sets the gear ratio of powertrain as an optimization variable has been determined via the previous matching and selection work. With matlab software, the multi - objective optimization mathematical model for powertrain system is established, and four sol-ving nonlinear manners are used to solve this model through setting objective functions, comparing and analyzing the results. Conse-quently ,the optimal scheme for vehicle gear ratio is derived, and the performance of power is improved largely while the performance of economy is raised slightly.