Digital PID controller designed and realized based on state machine

Digital PID control is a practical alternative for industrial production process, but it is not adequate for high speed processing. Using the modular method and the single process state machine design method, a hardware design scheme based on FPGA is presented to realize incremental digital PID controller. And the FPGA system is designed, compiled and simulated in QuartusII environment. The controller, which has high speed characters of state machine, the extendibility of digital PID, the real-time characters built by FPGA as well as software's flexibility well, provides an advisable method and heuristic information for the design of non-linear controllers. By VHDL simulation, the improved version is proved to be effective.