The Investigation of Control Strategies of Switched Reluctance Motor to Reduce the Torque Ripple in Vehicle

The control strategy of switched reluctance motor (SRM) in-wheel motor is investigated in order to reduce the influence of torque ripple of SRM on the ride comfort. The nonlinear model of switched reluctance motor (SRM) is established and the variable angle control strategy with optimal switch angles is applied to control SRM. However, the variable angle control strategy can not reduce the torque ripple of SRM significantly. Therefore, some advanced control strategies are developed to improve the ride comfort in electric vehicle. In this paper, the fuzzy proportional integration differential (PID) is developed to improve the torque ripple of SRM in which the fuzzy control idea is utilized to adjust the parameters of proportional integration differential (PID) control online and ensure the adaptive capabilities of the fuzzy proportional integration differential (PID) control to motor driving system. On the other hand, the fast terminal sliding mode control strategy is also presented due to its nonlinear and robustness. The results show that although the fuzzy proportional integration differential (PID) can improves the stability of the system over the conventional proportional integration differential (PID), the torque ripple of SRM can not be attenuated significantly. However, the fast terminal sliding mode control strategy not only improves the stability of the system, but also reduces the torque ripple significantly. This implies a potential application of the fast terminal sliding mode control strategy in the control of in-wheel motors for electric vehicle.