Research on electric vehicle longitudinal impact caused by oscillated torque of asynchronous motor by simulation

The problem that the parametric variation of asynchronous motor in electric vehicles can induce the magnetic field imperfect decoupling in the direct field-oriented control, the oscillation of output torque, the failure of trace of the speed and torque, the longitudinal impact, and the influence on riding amenity was investigated and analyzed. On the basis of this, the simulation analysis in motor control was made. The longitudinal dynamics model of an electric vehicle was build based on multi-body system dynamics. The dynamics model was coupled with the control model of the motor control strategy. The simulation results of the coupled model based on the UDC drive cycle proved that the presented optimum direct field-oriented control method is feasible, and the riding amenity is improved effectively.