An Enhanced Predictive Control Structure for Networked Control System with Random Time Delays and Packet Dropouts
Due to the random and uncertain characteristic of networked induced factors, the performance of networked control systems is seriously affected, which is not merely degraded but also cause system instability. In this paper, a newly enhanced control scheme with an improved smith predictor is proposed to solve the issues caused by the complex and uncertain network conditions. A database is integrated into the network controller to store all possible outputs predicted on line from the smith predictor based on all possible transmission delays and packet dropouts to overcome the main drawback of traditional smith predictor. A selector is added to the actuator to select a suitable control signal from the predicted control sequence based on the actual network conditions. Finally the simulation results demonstrate the effectiveness of the proposed methods.