Simultaneous robust optimization of suspension and active control system of road vehicles for handling improvement

This article proposes a simulation-based simultaneous robust design procedure of a suspension system and a vehicle dynamics controller. The aim of the procedure is designing a road vehicle that can maintain high stability and handling at the limit manoeuvering region even if the vehicle parameters and/or road conditions are varied. The system robustness is evaluated by the probabilities of unacceptable vehicle behaviour subject to the variations in uncertain vehicle parameters and steering/brake input patterns. The design problem is formulated as an optimization problem of suspension kinematics and controller parameters using a stochastic performance function. Numerical simulation results are presented to illustrate the effectiveness of the proposed procedure.