Backstepping LQG controller design for stabilizing and trajectory tracking of vehicle suspension system

Abstract

The aim of this paper is to design a backstepping linear quadratic Gaussian controller (BLQGC) for a vehicle suspension (VS) system to improve the ride comfort by absorbing the shocks due to a rough and uneven road. For designing of the BLQGC, a forth order linearized model of the VS system is considered. In this control strategy, the conventional linear quadratic regulator is re-formulated with a state estimator based on the backstepping control approach to improve the control performance. The validation of improved control performance of BLQGC is established by comparative result investigation with other published control algorithms. The comparative results clearly reveal the better performance of the proposed approach to control the oscillation of the VS system within a stable range in terms of accuracy, robustness and handling uncertainties.