Load-dependent observer design for active suspension systems
by Hui Zhang; Junmin Wang; Nong Zhang
International Journal of Vehicle Design (IJVD), Vol. 68, No. 1/2/3, 2015

Abstract: In the paper, a quarter-car model with an active suspension system is first considered. To incorporate the variation of sprung mass, a polytopic model with two vertices is established. In the model, the vibration from the ground is unknown. A load-dependent estimator is proposed to estimate the state vector when the system is subject to unknown input and measurement noise. By imposing some constraints on the estimator parameters, an estimation error dynamics is derived. The asymptotical stability and the energy-to-peak performance are investigated for the derived estimation error dynamics. With the stability and energy-to-peak conditions, the design method for the estimator parameters is proposed. It infers from the simulation and comparison results that the designed estimator is effective and better than the well-known Luenberger estimator.

Online publication date: Tue, 11-Aug-2015

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