A First Course in FUZZY and NEURAL CONTROL

254 CHAPTER 8. APPLICATIONS

empirical relationship governing the heat pumped at the cold surface given by
a commercially available typical Melcor Brand TEC [44] is considered.

Figure 8.2 Fuzzy control surface

Figure 8.3 displays the schematic of the Simulink model.

Figure 8.3. Simulink model for TEC heat transfer dynamics

Figures 8.4ó8.6 illustrate the controller performance under various operating
conditions.

As shown in Figure 8.6, the TEC will achieve the desired temperature in a
manner that may be characterized by a ìcriticalî response. However, it is noted
that the controller performance can befine-tuned to yield optimum results in a
practical implementation. The primaryissue addressed in the simulations above
is the effectiveness of a fuzzy controller to achieve the target values in a simple
manner without resorting to the design and development of a conventional PID
controller. This methodology can be easily extended to include several TECs
that may be required to obtain a desired temperature profile across a given
surface.