Embedded Fuzzy Control for Reefer Refrigeration Systems

This paper is devoted to the development of a fast industrial design of an embedded fuzzy controller for an OL unstable plant starting from an initial fuzzy system developed in conjunction with an expert. Through prototyping and implementation on a general-purpose microprocessor the CL plant can then be tested and used to iteratively identify and control the plant until the desired control system criteria is achieved. This paper describes the design, implementation and testing of an embedded fuzzy controller as a simple, practical solution to a regulation problem in reefer refrigeration systems. Fuzzy logic was utilized for the ease with which it enables expert opinion expressed within the framework of a natural language to be converted into a PID-like control algorithm. By using the Motorola HC12 MCU with its inbuilt fuzzy logic instruction set a rapid prototype design was implemented and the application of fuzzy logic and iterative identification and control to general industrial refrigeration systems was found to be a possible economically feasible solution.