Optimal gain tuning using microcomputer simulator

The application of microprocessors to online process control systems is considered. Automatic adjustment of a time-variant gain controller was done using a microcomputer simulator, to improve the dynamic performance of the closed-loop control system response. The optimum tuning for the gain controller was obtained analytically using Phillips integral algorithm, minimizing the integral squared error in the time domain. A third-order servomechanism control system was considered to show the usefulness and efficiency of this technique in improving the transient response of the closed-loop control system. Fortran IV was used to simulate the control problem, while the control algorithm was simulated using an 8085 microprocessor simulator written in assembly language. The activities of the interface circuits including A/D and D/A converters were simulated. A comparison was made between the theoretical system response obtained using an offline computation procedure and the real-time implementation of the control problem