Optimization and Control of Vehicle Vertical System with Suspended In-Wheel Motor

Abstract

This paper presents an optimization and control approach for vehicle vibration system with suspended in-wheel motor to reduce the vertical negative effects. Vibrations caused by the motor unbalanced radial force arising from road surface can be mitigated through the proposed ap-proach. A four quarter in-wheel motor suspension system with dynamic vibration absorber is established, and analytical switch reluctance motor (SRM) model is derived using Fourier series. Cuckoo search based optimal matching method between suspension and vibration isolator pa-rameters is designed to improve the vibration performance while reducing the external disturb-ance effect on the motor air gap with typical road excitations. On the basis of the optimal matching results, a hybrid control strategy is proposed for the in-wheel motor suspension, and the sus-pension and isolator dampers are considered as the semi-active device to assign the hybrid con-trol force according to model responses. Simulation results indicate that the optimized model can achieve better vibration characteristics, and the hybrid controller can improve the riding comfort and handling stability effectively.