Document Type


Date of Award

Fall 1-31-1994

Degree Name

Master of Science in Electrical Engineering - (M.S.)


Electrical and Computer Engineering

First Advisor

Constantine N. Manikopoulos

Second Advisor

MengChu Zhou

Third Advisor

Edwin Hou


Many industrial applications of fuzzy logic control have been reported. This thesis studies and reports the problems associated with the Heat-exchanger temperature control via conventional PID control implemented with Programmable Logic Controllers (PLC) and provides an example of design and implementation of fuzzy logic controllers (FLC's) for a Heat exchanger in a Water for Injection (WFI) system.

After a basic FLC was designed and tested, it is shown how its rule base evolved to achieve superior performance by utilizing additional low-cost sensing information in the process and its environment. A method for the implementation of FLC's into the existing PLC is discussed. The system performance of the five designed FLC rule-base strategies is compared with that of the existing PIID controller and it is concluded that better performance can be achieved by using the fuzzy logic control technology.

Finally, this thesis discusses some blocking problems in widespread industrial applications of FLCs and the possible solutions to them.



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