An auto-tuning controller for networked control systems

In this paper, we introduce a proportional-integral-derivative (PID) auto-tuning controller by using relay feedback and online gain updating method for networked control systems (NCSs). The proposed controller takes both advantages of relay feedback, which provides the initial knowledge of the control system, and updating method, that adapts to the changing input and load disturbance. In order to validate the effectiveness of our design, the proposed controller is evaluated experimentally with cFP 2220 platform from National Instruments, and with LabVIEW programming software. The results show that our design obtains superior tracking performance.