State and unknown input observer design for a class of non-linear systems: application to a fermentation process

Mohamed Kamel , Mohamed Chaabane , Abdessatar Chaari , Mondher Farza (1)

1 Equipe Automatique - Laboratoire GREYC - UMR6072

This paper deals with the simultaneous estimation of states and unknown inputs for a class of non-linear systems using only the measured outputs. A high gain non-linear observer is proposed. Besides the usual rank assumptions on the unknown input observers, the unknown inputs and their derivatives are assumed to be uniformly bounded. An application to an alcoholic fermentation process in chemical reactor semi-continuous, Fed-batch, is presented. Observer's performances are illustrated through the simulation results of the Fed-batch system.

Mots clés: nonlinear systems; unknown inputs; high gain observers; fermentation process; observer design; state estimation; alcoholic fermentation; simulation; batch processing

Domaines: Automatique; Automatique / Robotique

Mohamed Kamel, Mohamed Chaabane, Abdessatar Chaari, Mondher Farza. State and unknown input observer design for a class of non-linear systems: application to a fermentation process. Int. J. of Systems, Control and Communications, 2011, 3 (1), pp.34 - 52. ⟨10.1504/IJSCC.2011.039224⟩. ⟨hal-01060136⟩