This paper constructs a dynamic model of a four-wheel drive electric vehicle, which contains a vehicle model and a brushless DC motor model. In order to improve the starting and acceleration performance of the electric vehicle, we design a speed and current double closed-loop speed control system based on the constructed dynamic electric vehicle model. The starting and acceleration process of the electric vehicle is simulated and analyzed by CarSim-Matlab/Simulink co-simulation. The effectiveness of the speed control system is evaluated by the co-simulation results. In addition, the robustness of the speed control system is also analyzed for different vehicle masses.

This paper is based on the Bond Graph method to establish the mathematical model of UAV (Unmanned Aerial Vehicle) pneumatic launch system, simulates its work process through using MATLAB software, analyzes the influence of changing air tank inflation pressure, air tank volume on launch performance, and draws some important conclusions, which can provide a theoretical foundation for the future development and improvement of the system.