Abstract
In the present paper a bank of local linear observers is designed for an alcoholic fermentation process. The design is based on the respective linear approximants of the mathematical description of the nonlinear process at particular operating points. The target and tolerance operating areas of the process are determined. A residual of the performance of the observers is introduced. A switching mechanism is developed on the basis of the minimal residual. The performance of the proposed observer design scheme is illustrated using simulation results.