Suspension hybrid control for in-wheel motor driven electric vehicle with dynamic vibration absorbing structures

This paper presents a hybrid control strategy for suspension of the in-wheel motor (IWM) driven electric vehicle (EV) to improve vehicle ride comfort and reduce IWM vibration. A quarter vehicle model with the dynamic vibration absorbing structure (DVAS) is first developed. Different from the traditional suspension system, the DVAS uses an extra spring-damper system to achieve vibration reduction. The dynamics and boundary models for two commercially available and controllable dampers are then presented. Both dampers in the suspension and the DVAS are used to allocate the hybrid control force synthesized depend on the system responses. Simulation results for excitations of both random road and bump input are finally analyzed, and the proposed hybrid controller can simultaneously improve ride comfort and reduce IWM vibration compared to the traditional suspension system.