REAL-TIME FUZZY-KNOWLEDGE-BASED CONTROL OF BAKERS-YEAST PRODUCTION

A real-time fuzzy-knowledge-based system for fault diagnosis and contr ol of bioprocesses was constructed using the object-oriented programmi ng environment Small-talk/V Mac. The basic system was implemented in a Macintosh Quadra 900 computer and built to function connected on line to the process computer. Fuzzy logic was employed in handling uncerta inties both in the knowledge and in measurements. The fuzzy sets defin ed for the process variables could be changed on-line according to pro cess dynamics. Process knowledge was implemented in a graphical two-le vel hierarchical knowledge-base. In on-line process control the system first recognizes the current process phase on the basis of top-level rules in the knowledge-base. Then, according to the results of process diagnosis based on measurement data, the appropriate control strategy is subsequently inferred making use of the lower level rules describi ng the process during the phase in question. (C) 1995 John Wiley and S ons, Inc.