• Wang, Yanling (Department of Mathematics Tianjin University) ;
  • Qi, Ailing (College of Science Civil Aviation University of China)
  • Received : 2011.05.01
  • Published : 2014.01.31


In this paper, we show that general nonlinear switched systems are asymptotically controllable if and only if there exist control-Lyapunov functions for their relaxation systems. If the switching signal is dependent on the time, then the control-Lyapunov functions are continuous. And if the switching signal is dependent on the state, then the control-Lyapunov functions are $C^1$-smooth. We obtain the results from the viewpoint of control system theory. Our approach is based on the relaxation theorems of differential inclusions and the classic Lyapunov characterization.


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