Fuzzy Logic Control – Implementation

To minimize the time needed to apply fuzzy logic control, most manufacturers offer a version of fuzzy logic control in which the rules and membership functions are pre-defined. As described in Chapter 6 of Advanced Control Foundation – Tools, Techniques, and Applications, , a manufacturer can provide support for auto-tuning by restricting the fuzzy logic capability in this way. Thus, fuzzy logic control can be substituted for PID control.

An example of a fuzzy logic function block that is designed as a replacement for PID control is shown below.

This type of single loop fuzzy logic control has been successfully applied to a variety of applications. Many of these applications involve temperature processes that are characterized by significant process lag with little or no deadtime.