DESIGN OF A SLIDING-MODE OBSERVER FOR A BIOTECHNOLOGICAL PROCESS

This paper deals with the implementing of a sliding-mode observer for the lipase producing process using Candida rugosa yeast. It does consider a simplified model of the process, consisting in three equations, for the two substrates and the biomass. The sliding-mode observer has been designed on the basis of the equivalent control method. For the observer implementation it is necessary a state transformation that has to bring the process to the observable canonic form. The results obtained through numerical simulation show a good behaviour of the sliding-mode observer in the presence of the parameter's uncertainties that interfere with the process.