Stability tests and stabilization for piecewise linear systems based on poles and zeros of subsystems

Authors:
Yasushi Iwatani;Shinji Hara
Affiliations:
Department of System Information Sciences, Tohoku University, Aramaki Aza Aoba 6-6-01, Aoba-ku, Sendai 980-8579, Japan;Department of Information Physics and Computing, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan
Venue:
Automatica (Journal of IFAC)
Year:
2006

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Abstract

This paper provides several stability tests for piecewise linear systems and proposes a method of stabilization for bimodal systems. In particular, we derive an explicit and exact stability test for planar systems, which is given in terms of coefficients of transfer functions of subsystems. Restricting attention to the bimodal and planar case, we show simple stability tests. In addition, we drive a necessary stability condition and a sufficient stability condition for higher-order and bimodal systems. They are given in terms of the eigenvalue loci and the observability of subsystems. All the stability tests provided in this paper are computationally tractable, and our results are applied to the stabilizability problem. We confirm the exactness and effectiveness of our approach by illustrative examples.