Design of anti-roll bar systems based on hierarchical control

This paper proposes the modelling and control design of active anti-roll bars. The aim is to design and generate active torque on the chassis in order to improve roll dynamics. The control system also satisfies the constraint of limited control current derived from electrical conditions. The dynamics of the electro-hydraulic anti-roll bar are formulated with fluid dynamical, electrical and mechanical equations. A linear model is derived for control-oriented purposes. Several different requirements and performances for the control influence the hierarchical handling of the control design. In the hierarchical architecture, a high level improves chassis roll dynamics via a gain-scheduling linear quadratic (LQ) control, while a low level guarantees the input limitation and produces the necessary actuator torque by a constrained LQ control. The operation of the designed anti-roll bar control system is illustrated through simulation examples.

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