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As the key part of power supply equipment in electric vehicles, power battery box may lose effect due to random vibration of the electric vehicle. To effectively predict the strength of the structure of power battery box and the performance of the internal components in the environment of vibration, this paper uses union simulation of Hypermesh and ANSYS to analyze its intrinsic mode and the characteristics of responses caused by random vibration. In doing this, displacement, acceleration and equivalent stress nephogram are acquired, providing a basis for structure design and further optimization.

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To improve the shift quality of electric vehicles equipped with combined clutch planetary transmission with two gears, a dynamic model of shifting process is established. The shift jerk and friction work are chosen as a comprehensive control target. Linear quadratic optimal control is used to optimize the upshift process of combined clutch planetary transmission, in which the motor is involved. The simulation results of upshift show that shift quality can be effectively improved by the coordinated control of the motor torque and the clutch transmission torque during upshift process, compared with combined clutch control only.