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In this paper a new active suspension scheme for vehicles with non-linearities is proposed. The proposed scheme makes the vehicle suspension system follow a modified skyhook model and is based on the sliding-mode control strategy augmented by the so-called inertial delay control which estimates and negates the effects of the unknown road profile and the uncertainties in the suspension system. The accuracy of estimation is analysed and it is shown that the estimation error is ultimately bounded. The means to improve the accuracy of estimation are outlined and the overall stability of the suspension system is proved. The efficacy of the method is illustrated by simulation for an automobile vehicle suspension system for various road profiles.

In this paper, we extend a recently developed method (Zhong and Rees, 2004, “Control of Uncertain LTI Systems Based on an Uncertainty and Disturbance Estimator,” ASME J. Dyn. Syst., Meas., Control, 126(4), pp. 905–910), for controlling uncertain linear systems using an uncertainty and disturbance estimator, to uncertain nonlinear systems. Further the control proposed in this paper removes the drawback of large initial control underlying the method. The stability of the overall system of the plant and the estimator is proved. The efficacy of the method is illustrated by simulation.

In this paper a novel active suspension scheme that combines sliding mode control with a disturbance observer is proposed for a quarter car model. The disturbance observer estimates the uncertainties in the system and the unknown road disturbance acting on the unsprung mass. Two control strategies to compensate for the uncertainties and the road disturbance in order to improve the ride comfort are proposed. The stability of the suspension system and the disturbance observer is proved. The efficacy of the method is illustrated by simulation for a vehicle suspension system.