In industrial automation, fuzzy logic technologies enable the efficient and transparent implementation of human control expertise. | rBÄCK n ri n n nn n n n mH Swtid mM Lm MM Llil4 kdrf ItoJIif kdiJ Ufl BtM kjJ klM Fuzzy Logic and NeuroFuzzy Applications in Industrial Automation and Process Control Constantin von Altrock M. Sc. E. E. M. O. R. Inform Software Corporation 2001 Midwest Rd. Oak Brook IL60521 hotline@ Phone 1-800-929-2815 In industrial automation fuzzy logic technologies enable the efficient and transparent implementation of human control expertise. Here the individual control loops mostly remain controlled by conventional models such as PID. The fuzzy logic system then gives the set values for these controllers based on the process control expertise put in the fuzzy logic rules. Three case studies show different ways of integrating conventional control techniques and fuzzy logic. As a result we will develop guidelines on when fuzzy logic conventional models or a combination thereof shall be used. The first case study of a container crane controller shows the primary advantage of fuzzy logic a control strategy can directly be implemented from engineering knowledge. While standard PID controller cannot solve the problem due to non-linearities of the process and a mathematical model is of prohibitive complexity a fuzzy logic solution only takes a few days. The second case study covers a more complicated process control example. In petrochemical industry ethine is converted to ethene in a hydrogenation reactor using a catalyst. To control the reaction the temperature of the incoming material and the flow of a moderator substrate are kept to their set points by PID controllers. The optimal set point for temperature and flow however depends on numerous factors. Fuzzy logic is used to replace the operator in determining the set point for these control loops. The third case study shows how NeuroFuzzy techniques enhances fuzzy logic. On the example of a glass container sorter in a recycling plant we demonstrate how an entire solution can be generated .
