Liu, Song-hui, Wu, Jun, Xu, Wei-hua and Chen, Sheng
An output-feedback networked control system and its stability
Journal of Zhejiang University, Engineering Science, 42, (3), .
A class of output-feedback networked control systems is proposed to overcome the detrimental effect of feedback lag caused by the shared communication network in the networked control system. By introducing a plant model and a buffer into the system, the control output can be computed and the plant model is updated using the plant output when feedback is available, while the control output is computed based on the plant model output instead of the plant output when feedback is unavailable. Based on the conditions that the plant is single-input single-output and the error between the plant and the model exists, the necessary and sufficient condition for closed-loop stability of this networked control system is derived. Simulation indicates that the range of model errors within which the system is stable can be derived easily using this necessary and sufficient condition.
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