Design And Application Of Self-tuning Fuzzy PID Controller Based On ARM7 Processor

This paper mainly studies the design and application of self-tuning fuzzy PID controller. Nowadays because of varying nonlinearity, large delay, parameter variability and model uncertainty in industrial processes, conventional digital PID controller needs to constantly adjust the PID parameters to achieve satisfactory control effect to the same controlled object under different conditions. Aiming at solving these questions, the design ideology and hardware realization of a new self-tuning fuzzy PID controller based on embedded system, are presented in the paper.Firstly, the paper studied the digital PID algorithm. And by combining fuzzy control and digital PID control, self-tuning fuzzy PID controller algorithm, which was simulated in SIMULINK environment, was proposed. Then, the detailed hardware design and software design of self-tuning fuzzy PID controller was provided. In the end, the experiment was completed in the debugging platform of electrostatic precipitator power supply, verifying the good effect of self-tuning fuzzy PID controller.In the paper, the hardware design of self-tuning fuzzy PID controller was completed based on ARM7 S3C44B0X processor, which has high performance, low power consumption and feature-rich modules. The keyboard and LCD were used to achieve human-machine control. The input of control parameters was realized through the keyboard. LCD liquid crystal screen displays data of the controlled objects real time. The self-tuning fuzzy PID controller completes signal acquisition through10-bit ADC module of ARM7 processor and output 0-5V DC signal with PWM module of ARM7, level converter and second-order active filter. In software design, uC/OS-Ⅱand uC/GUI were transplanted first. Then, the tasks of parameter setting, data processing, serial communication and data storage were completed based on uC/OS-Ⅱ. The boot welcome screen, parameters setting and real-time data display interfaces were also designed based on uC/GUI.Finally, the application of electrostatic precipitator power supply, which is controled by self-tuning fuzzy PID controller and CA6100 trigger board, was presented detailedly in the paper. Experiment was completed in the debugging platform of electrostatic precipitator power supply, verifying the good effect of the designed self-tuning fuzzy PID controller from the results. Meanwhile, the friendly human-machine interface is the characteristic of this design, which realized the monitoring of controlled object.