Optimum Design of Powertrain Mounting System for the Electric Vehicle

The center of mass system of motor powertrain was established and the basic theory of decoupling and optimization for powertrain mounting system was described systematically. For an electric vehicle powertrain mounting system, firstly the vibration coupling characteristics of the 6-DOF model was analyzed by means of the method of energy decoupling, and then the method was proposed according to decoupling factors that the mount position and stiffness were optimized to improve the decoupling rate based on the TRA theory and the genetic algorithm. Finally the decoupling characteristics and the vibration isolation performance were verified by simulation, and the results show that the optimized mounting system improves significantly the energy decoupling rate of mounting system in the full vehicle model and in the vehicle transient characteristics under the condition of standing start acceleration, and increases the vehicle's comfort performance.