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在能源危机和环境问题的双重压力下,纯电动汽车以零排放、低噪声和电能来源广泛等优点引起了各国政府和汽车企业的重视。以城市用纯电动汽车为研究对象,分析研究其动力传动系统的参数,根据整车参数和动力性、经济性要求匹配整车动力系统参数。从提高传动效率来对初步匹配出的动力系统参数进行优化,以加速时间最短和工况续驶里程最大为优化目标,用惩罚函数将目标函数和约束条件构成关于传动速比的适应度函数,通过遗传算法进行优化,最终得到动力系统最优参数。
Under the dual pressures of energy crisis and environmental issues, pure electric vehicles have drawn the attention of governments and auto companies in the world due to their advantages of zero emission, low noise and wide range of sources of electricity. Taking the pure electric vehicle in the city as the research object, the parameters of the powertrain are analyzed and studied, and the parameters of the whole vehicle dynamic system are matched according to the vehicle parameters and the requirements of power and economy. From the perspective of improving the transmission efficiency, the parameters of the dynamic system that are initially matched are optimized to optimize the target with the shortest acceleration time and the maximum driving range. The objective functions and constraints are formulated into the fitness function with respect to the transmission speed ratio by the penalty function, Through genetic algorithm optimization, finally get the optimal parameters of power system.