Page 234 - Introduction to Microcontrollers Architecture, Programming, and Interfacing of The Motorola 68HC12

7.6 Fuzzy Logic 211

Figure 7.21. Fuzzy Logic Control System

A microcontroller-based fuzzy logic control system has & fuzzy inference kernel and
a knowledge base. See Figure 7.21. The fuzzy inference kernel is executed periodically
to determine system outputs based on current system inputs. The knowledge base
contains membership functions and rules.
A programmer who does not know how the application system works can write a
fuzzy inference kernel. One execution pass through the fuzzy inference kernel generates
system output signals in response to current system input conditions. As in a
conventional control system, the kernel is executed as often as needed to maintain
control. If the kernel is executed too often, processor bandwidth and power are wasted;

Figure 7.22. Membership Functions