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A Fuzzy Logic Controller of Electro-Hydraulic Position Servo System

Pornjit Pratumsuwan, Siripun Thongchai, Surapun Tansriwong


Since classical PID controllers are sensitive to variations in the electro-hydraulic position servo system (EHPSS) parameter, especially, when the load changes. Fuzzy Logic Controllers do not need precise information about the system variables in order to be effective. A Fuzzy Logic Controller (FLC) for the EHPSS is proposed in this paper. The EHPSS in this study consists of cylinder, servo valve (linear motor type), power unit, load, linear potentiometer, amplifier card, and DAQ card. A FLC is designed based on the expert knowledge. The fuzzy inputs are an error (e) and a change of position error (


PID controller; fuzzy logic controller; electro-hydraulic position servo system

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