Temperature Control using Fuzzy Logic

Singhala P,Patel B,Shah D.N

doi:10.5121/ijics.2014.4101

Abstract

The aim of the temperature control is to heat the system up todelimitated temperature, afterwardholdit at that temperature in insured manner. Fuzzy Logic Controller (FLC) is best way in which this type of precision control can be accomplished b y controller. During past twenty yearssignificant amount of research using fuzzy logichas done in this field of control of non-linear dynamical system. Here we have developed temperature control system using fuzzy logic.Control theory techniques are the root from which convention controllers are deducted . The desired response of the output can be guarante ed by the feedback controller.

Highlights

Low cost temperature control using fuzzy logic system block diagram shown in the fig. in this system set point of the temperature is given by the operator using 4X4 keypad
Temperature control system shown in below figure is works on the basic principle of fuzzy logic.The fundamentals of fuzzy logic elaborated by LotfiA.Zedeh, a professor at the University of California at Berkley.He presented fuzzy logic not as a control methodology, but as a method of processing data by allowing partial set membership instead of non membership
If temperature is 60 degree we say it is not belong to HOT set but in fuzzy logic it is belong to set but having membership grade 0

Summary

Introduction

Low cost temperature control using fuzzy logic system block diagram shown in the fig. in this system set point of the temperature is given by the operator using 4X4 keypad. Controller calculates error between set point value and current value and consider as Input function of fuzzy logic. Defuzzification process calculates actual value of PWM for heater and fan which is output of the temperature control system. The process comprises of a heater, fan and a temperature sensor. Amount of power delivered to both heater and fan can be controlled by passing a command through serial port via microcontroller. Microcontroller generate PWM (Pulse Width Modulation) signal for the MOSFET to deliver desired amount of power to fan and heater. It could be used as a small plant readily available for various experimentation and study purpose

Working Principle

Implementation of fuzzy logic

Pulse width modulation technique

Outcome of temperature control using fuzzy logic

Findings

Conclusion