Technical Communique: A modified normality condition for decentralized supervisory control of discrete event systems

Authors:
Shigemasa Takai;Toshimitsu Ushio
Affiliations:
Department of Opto-Mechatronics, Wakayama University, Wakayama 640-8510, Japan;Department of Systems and Human Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
Venue:
Automatica (Journal of IFAC)
Year:
2002

Citing 4
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Abstract

In this paper, we study nonblocking decentralized supervisory control of discrete event systems. We introduce a modified normality condition defined in terms of a modified natural projection map. The modified normality condition is weaker than the original one and stronger than the co-observability condition. Moreover, it is preserved under union. Given a marked language specification, there exists a nonblocking decentralized supervisor for the supremal sublanguage which satisfies L"m(G)-closure, controllability, and modified normality. Such a decentralized supervisor is more permissive than the one which achieves the supremal L"m(G)-closed, controllable, and normal sublanguage.