Diseño y construcción de un control difuso de lazo cerrado de temperatura mediante el microcontrolador 18F452 para los laboratorios de teoría de control de la Universidad Politécnica Salesiana.

Abstract

The titulation project aims to show the stages for the development of a controller based on fuzzy logic, and design a module responsible for controlling the temperature of a heating chamber from 50 ° C to 100 ° C. The module has two inputs and one control output, inputs correspond to the setpoint that will be the desired temperature by the user, and error, that is the result of the difference between the actual temperature measured by a thermocouple type J and the setpoint; these values enter into the designed fuzzy algorithm, consisting of three stages, fuzzification, fuzzy rules, and defuzzification. Fuzzification comprises two input fuzzy sets and one output that represent, setpoint, error and output respectively. Each fuzzy set contains different linguistic variables, this stage provides a membership value of setpoint and error to each linguistic variable of the input fuzzy sets. Fuzzy rules emulate the behavior of an operator based on its experience, and calculate what percentage of each linguistic variable of output fuzzy set should be activated based on the membership values from fuzzification. In the defuzzification stage are analyzed the values obtained by the fuzzy rules and calculates a single output value, not diffuse, to correct the error in the system. Finally, data are sent via a serial interface to a computer for monitoring the process.