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This paper investigates the design method of a fuzzy logic control system for a heat exchanger. A proportionalintegrative (PI) controller, tuned using Ziegler-Nichols method, will provide the starting point in the development of the Fuzzy Logic Controller (FLC). First an initial linear FLC is designed which is equivalent to the conventional PI controller, and provides the same performances. Then, by making the FLC nonlinear and by fine tuning it the design stage is completed. To verify the effectiveness of the design procedure, modeling and simulations are done using Matlab-Simulink.

This paper presents a comparative analysis of two adaptive control methods used in case of time varying plant parameters. The first adaptive control method is based on the stability theory of Lyapunov and the other one is based on fuzzy logic. Also, the performances of the proposed control algorithms are evaluated with simulation environment. These control structures are designed for local compensation of the non-linear interactions and unknown payload variations in flexible-link gear drive.