Robust Observer Design for a Class of Nonlinear Systems using Filtering and Dynamic Scaling

Conference on Decision and Control, 2009
Author(s):Astolfi A., Ortner P.
In this paper we design a robust nonlinear observer for a class of nonlinear systems to account for model/plant mismatches. The observer satisfies a L2 gain. In the design procedure a partial differential equation needs to be solved. To avoid solving the partial differential equation dynamic scaling and output filtering are used. The results are illustrated with two application examples: engine torque estimation for a combustion engine test bench and for an induction motor.
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