IEEE Transactions on Automatic Control, Vol.51, No.7, 1190-1195, 2006
Quantization, time delays, and nonlinear stabilization
The purpose of this note is to demonstrate that a unified study of quantization and delay effects in nonlinear control systems is possible by merging the quantized feedback control methodology recently developed by the author and the small-gain approach to the analysis of functional differential equations with disturbances proposed earlier by Teel. We prove that under the action. of a robustly stabilizing feedback controller in the presence of quantization and time delays satisfying suitable conditions, solutions of the closed-loop system starting in a given region remain bounded and eventually enter a smaller region. We present several versions of this result and show how it enables global asymptotic stabilization via a dynamic quantization strategy.
Keywords:inputt-to-state stability;nonlinear system;quantized control;small-gain condition;time delays