基于激励特性的电动汽车悬置系统改进设计

Mounting System Improvement Design of Battery Electric Vehicles Based on the Excitation Characteristics

对电动总成在激励特性等方面的差异与传统汽车的动力总成进行对比。与传统动力相比,电动总成的扭矩波动很小且无惯性力,因此对悬置系统隔振的要求不高;电动总成的外特性和使用工况决定了其冲击大的特点,这决定了电动总成的悬置系统应能更好应对扭矩突变造成的瞬态冲击。以某电动总成为研究对象,建立急加速工况下瞬态响应仿真分析模型。在仿真分析的基础上对悬置系统的布置和刚度进行改进设计。改善了急加速时的整车抖动,消除了撞击噪声。

A comparative research of excitation performance between internal combustion engine powertrain and electric powertrain of vehicles was carried out.Comparing to the traditional internal combustion powertrain,the electric power train has no inertial force and its torque fluctuation is very small and negligible,so its requirement of vibration isolation is low.However,the torque characteristic of the motor and the operation condition of the electric powertrain decides that there are more serious shock conditions than that of the traditional power train during the operation.Therefore,the shock resistance capacity to the torque impact is important and necessary for the mounting system of the electric powertrain.In this paper,the simulation model for analyzing the transient response of the electric powertrain during acceleration was built.Based on the simulation,the improvement design of the layout and dynamic stiffness of the mounting system was carried out.The shake of the vehicle during rapid acceleration was greatly improved and the impacting noise was eliminated.