An auto-tuning controller for networked control systems

Research on Improved Auto-Tuning of a PID Controller Based on Phase Angle Margin

“…In this paper, 0.05, 0.5 and 2.75 for β are respectively applied to the tuning formula of the controlled plant G 1 (s) = 5 50s+1 e −s , and determined the PID controller parameters and the step response curve, as shown in Figure 6 by Equation (8). The overshoot of the control curve when β = 0.5 is about 21%, and the adjustment time is longer than that of the curve with β = 2.75.…”

“…The specific process is as follows: According to the After obtaining the mathematical model of the controlled plant, the correction coefficient is adjusted online by an optimization algorithm. The specific process is as follows: According to the amplitude, angular frequency and target phase margin of the oscillation curve output of the relay circuit, the PID controller parameters are calculated online by Equation (8), in which the correction coefficient β traverses a certain range, generally taking (0,10). The PID controller and the identified plant transfer function constitute a closed loop system.…”

“…However, they did not consider the impact of noise on the actual environment. In [8], the hysteresis relay was used to remove the influence of a certain amplitude noise in the system. The software platform was developed to operate and supervise the parameter tuning process, and was then successfully applied into the network control system, however, there was no comparison of the algorithm effectiveness.…”