A study on the in-wheel motor control strategy for four-wheel independent drive electric vehicles

For reducing the effects of torque ripple in wheel hub motor on the ride comfort of electric vehicles, a control strategy for switched reluctance motor (SRM) is proposed. A nonlinear model for SRM is set up and the optimum switching angle control is exerted on SRM. As for the issue of motor torque fluctuation, firstly the fuzzy algorithm is used to conduct online tuning on the parameters of conventional PID controller based on direct torque distribution control; then a control strategy combining fast terminal sliding mode algorithm with direct torque allocation is put forward. The results of simulation show that the introduction of fuzzy algorithm enhances the stability of system while the use of fast terminal sliding mode algorithm not only raises the disturbance resistance of system, but also reduces the torque ripple of motor.