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 control an industrial process. The fuzzy logic is provided to tune the PID parameters by using a gain scheduling method. The tuning scheme is represented by a fuzzy system, which consists of fuzzification rule inference and defuzzification. The fabricated FPGA chip, XC2S50-5tq-144, is embedded with the fuzzy system, which the chip is called fuzzy-PID controller. The fuzzy-PID controller is contained several circuits, such as multiplier, adder, subtraction and some of the other 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 /spl mu/sec per action at 40.550 MHz. 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 has achieved and shown the better performance than standard PID controller E50AK. which is automatic tuneable parameter system.