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Uncertainty and Disturbance Estimator based Control of Active Suspensions with a Hydraulic Actuator

This paper presents a novel control method for active suspension systems based on the Uncertainty and Disturbance Estimator (UDE) control strategy. The nonlinear dynamics of the hydraulic actuator in a quarter-car active suspension system is considered with uncertainties. In order to facilitate the controller design, the whole system is partitioned into a linear subsystem and a nonlinear subsystem. For the linear subsystem, a reference model is offered based on sky-hook damper and the UDE control strategy is applied to obtain desired fictitious input of linear subsystem. For the nonlinear subsystem, sliding mode control approach is used to construct controller in order to force the output of nonlinear subsystem to track the desired fictitious input of linear subsystem. Simulation verifies the effectiveness of the proposed method. DOI: http://dx.doi.org/10.5755/j01.itc.45.4.13372