Fuzzy Logic PID controller based on FPGA for process control

Abstract

In this paper, a fuzzy proportional integral derivative (PID) controller, which is fabricated on a Field Programmable Gate Array (FPGA). is proposed to conitrol an ilndustrial process. The fuzzy logic is provided to tune the PID parameters by using a gain scheduhng method. The tuning scheme is represented by a fuzzy svsten. which consists of fuzzification, rule inference and defuzzification. The fabricated FPGA chip, XC2S50-Stq-144. is embedded with the fuzzy system. which the chip is called fuzzv-PID controller. The fuzzy-PID controller is contained several circuits, such as multiplier, adder, subtraction and some of the otlher logic gate. The controller system uses two converter cards: TDA8763AM/3 (10 bits, high speed) to convert from analog to digital signal, DAC08 (8 bits) to convert from digital to analog. The maximum speed of the controller about 2.1 psec per action at 40.550 AIH.Z. is calculated from timing summary. The fuzzy-PID controller based on FPGA is verified by using to control model of level and temperature process. From the experimental results of the level and temperature control. the fuzzy-PID controller lhas achieved and shown the better performance than stanidard PID controller E50AK. which is automatic tuneable parameter system.©2004 IEEE.