Quadratic Optimal Control and PID Regulator Parameter Adjustment

This paper discusses relationship between digital PID regulator and optimal feed back control for quadratic performance index with regard to discrete time linear time-invariant systems,presenting a method of optimally adjusting PID regulator parameters.As an ex醡ple,we consider the temperature control system(2 input/2 output linear time-invariant system) of creep testing furnace.Digital simulation and field test demonstrates that the method presented in this paper is useful and convenient,under steady-state conditions.