Design and implementation of Digital Fuzzy-PID controller based on FPGA

In order to solve the problem of precise control of non-linearity system, a digital fuzzy-PID controller is designed by combining the advantages of fuzzy inference and PID controller based on FPGA. First, the model of the controller is established on the platform of Simulink. Simulation result shows that the controller exhibits a good transient response and a stable control action despite of the divergent controlled process. In the model, the control rules are established with the fuzzy logic toolbox of Matlab. Then the model is accomplished by VHDL using hierarchal and component design method. The controller is completed on Quartus II 8.0 by the technique of offline calculation but online query processor. Finally, IP core of this controller is downloaded to the FPGA chip EP1C6Q240C8. Results of the experiment indicate that the operating speed of the controller is quick and the dynamic property of the control system has been improved evidently.