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

International audienceThis 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