Error driven PI control of EV propulsion systems based on induction motors

Error driven proportional and integral control is presented in this paper for electric vehicle (EV) propulsion systems based on induction motor drives. By introducing the system error into proportional control as a real time tuning factor, improvements to system dynamic performance are demonstrated by computer simulation and laboratory tests on an electric vehicle propulsion model. The results from theoretical sensitivity analysis, computer simulations and laboratory tests have shown that under the proposed control algorithm, the system performance is less sensitive to variations of parameters such as EV moment of inertia, induction motors´ torque coefficient and EV load torque, than a conventional proportional and integral control algorithm. The stability analysis for the control system using Lyapunov´s second method is also presented and verified by computer simulations.