A New Smith Predictor and Fuzzy Immune Control for Hybrid Networked Control Systems

To aim at time-variant or uncertain network delays in the hybrid networked control systems (HNCS) of the wired and wireless, as well as Smith predictor models and real models of the controlled plants might be mismatch, a novel approach is proposed that a new Smith predictor combined with fuzzy immune control for the HNCS. Because new Smith predictor hides predictor models of the network delays into real network data transmission processes, further all network delays no longer need to be measured, identified or estimated on-line. It is applicable to some occasions that network delays are random, time-variant or uncertain, possibly large compared to one, even tens sampling periods, at the same time, there are some data dropouts in closed loops. Based on IEEE 802.11 b/g (WLAN) and CSMA/CD (Ethernet) respectively in the inner and outer closed loops, the results of simulation show validity of the control scheme, and indicate that system has better dynamic performance and robustness.

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