Abstract:
In order to improve the dynamic and economy performance of the drive system of electric vehicle (EV), a battery discharge efficiency model, a drive motor system efficiency model and a EV acceleration model were used to build comprehensive objective function. Distributing the weights of the dynamic and economic performance of comprehensive objective function according to the characteristics of city roads, an orthogonal test table was established with the motor torque-motor speed and motor torque-accelerator pedal opening change rate as the signal factors, and with the driving motor temperature and battery pack state of charge as the limit factors. According to the signal to noise ratio of Taguchi robust control, the controller output torque of whole vehicle was optimized. A actual vehicle test was carried out according to the electric vehicles energy consumption and range test procedures in GB/T 18386-2017. The test results got in an urban road cycle show that, compared with previous drive control strategy, the method based on motor torque-motor speed orthogonal table can save energy consumption by 9%; the method based on motor torque-accelerator pedal opening change rate orthogonal table can save energy consumption by 4%.