Abstract
This paper investigates the hardware implementation of a digital control loop based on a microprocessor for optimal gain tuning. It consists of a digital controller implemented on an 8085 microprocessor and an analogue plant simulation (implemented on an analogue computer). Automatic adjustment of a time-variant gain controller is carried out to improve the dynamic performance of the closed-loop system response. The optimum tuning for the gain contoller is solved analytically using the Phillips integral algorithm in the sense of minimizing the integral-squared error (ISE) criterion formulated in the time domain. An example of a third-order servomechanism control system is considered to show the usefulness and efficiency of this technique in improving the transient response of the closed-loop control system. A comparison is made between the theoretical system response (obtained using an off-line computation procedure) and the real-time implementation of the control problem.