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Fuzzy Based Control Using Lab view For Temperature Process

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Author(s): S.Kavitha, B.Chinthamani, S.Joshibha Ponmalar

Journal: International Journal of Advanced Computer Research
ISSN 2249-7277

Volume: 2;
Issue: 6;
Start page: 8;
Date: 2012;
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Keywords: Fuzzy logic control | resistance temperature detector | temperature sensor | multiple input single output

ABSTRACT
This project aims at designing and implementing afuzzy controller for Multiple Input Single Outputtemperature process. Temperature control of waterin the tank is achieved by varying current to theheating rod and inlet flow rate by a fuzzy controller.The system consists of a tank, reservoir, variablespeed pump, temperature sensor placed inside aheating tank containing the heating rod, voltagecontrolled current source and computer. Water ispumped into the tank from reservoir and RTDmeasures the current temperature. The signal fromthe temperature sensor is sent to the DAQ interfacedto the computer. LabVIEW software is used toacquire the input signal and send the output signalthat is determined by the control algorithm. Fuzzylogic controller is designed in LabVIEW. Based onthe set point temperature, the controller sets theappropriate current to the heating rod. If therequired temperature is less than that sensed by thetemperature sensor, the flow rate of water into thetank is controlled by a variable speed pump. Whileconventional controllers are analytically describedby a set of equations, the FLC is described by aknowledge-based algorithm. Thus this system ishighly efficient in both heating and reducing thetemperature of the tank. A fuzzy logic controllergives faster response, is more reliable and recoversquickly from system upsets. It also works well touncertainties in the process variables and it does notrequire mathematical modelling.
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