Abstract: Suitable structure of digital process control is proposed and the optimal setting of controller parameters is accomplished by minimizing the prescribed integral performance index, which ensures a strictly aperiodical closed-loop system step response. The proposed design procedure is intended for a wide class of slowly varying processes that may be characterized by the steady-state gain, one time constant, and transport lag. The influence of transport lag on the speed of system response is analyzed. The results of the analytical design are presented in the form suitable for a straightforward microcontroller implementation.
Key words: Process control, digital PID controller.