Online delay estimation and guaranteed cost control of temperature control system with network in feedback loop

This article deals with designing of an On-line Delay Estimator to estimate the delays within a network. Here, the network is incorporated in the feedback channel of a temperature control plant. One of the challenges of such Networked Control Systems (NCS) is to have an exact knowledge of delays present within the network. For delay information either time triggered protocols are used or a delay estimator is designed. Here an estimator is designed and the performance of this estimator is evaluated using a guaranteed cost control based fixed as well as variable gain state feedback controller for time varying delays. The algorithms have been verified using simulated as well as experimental results.