Effects of Design Parameter of In-Wheel Motor Suspension System on Electric Vehicle Ride Comfort

Hoang Anh Tan, Nguyen Thanh Cong, Le Hong Thai

Electric vehicle, In-wheel motor, Suspension, Ride comfort.

The main goal of this paper is to evaluate the effects of design parameter of in-wheel motor suspension system (IMSs) on electric vehicle ride comfort. In order to achieve this goal, a 3-DOF quarter-vehicle dynamic model of an electric vehicle under two input excitation sources such as road surface roughness excitation and in-wheel motor excitation is established for simulation and evaluation.  The equations of vertical motion of electric vehicle are described using Newton-Euler equation which are solved via Matlab/Simulink software. The root-mean-square (RMS) acceleration of the vertical vehicle body according to the international standard ISO 2631-1 (1997) is selected as an evaluation criteria of vehicle ride comfort. In-wheel suspension parameters such as stiffness and damping coefficients are respectively analyzed and evaluated its effect on vehicle ride comfort. The study results indicate that these parameters of IMSs have a great effect on vehicle ride comfort. The stiffness values of IMSs increase, vehicle ride comfort is going to be worse and vice versa vehicle ride comfort is improved. The study results provide a theoretical basis for designing IMSs for electric vehicles.

https://doi.org/10.31871/WJRR.12.6.10