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Jagtap, Pushpak; Swikir, Abdalla and Zamani, Majid (2020): Compositional Construction of Control Barrier Functions for Interconnected Control Systems. In: Proceedings of the 23rd International Conference on Hybrid Systems: Computation and Control (HSCC2020) (Part of Cps-Iot Week)

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In this paper, we provide a compositional framework for synthesizing hybrid controllers for interconnected discrete-time control systems enforcing specifications expressed by co-Buchi automata. In particular, we first decompose the given specification to simpler reachability tasks based on automata representing the complements of original co-Buchi automata. Then, we provide a systematic approach to solve those simpler reachability tasks by computing corresponding control barrier functions. We show that such control barrier functions can be constructed compositionally by assuming some small-gain type conditions and composing so-called local control barrier functions computed for subsystems. We provide two systematic techniques to search for local control barrier functions for subsystems based on the sum-of-squares optimization program and counter-example guided inductive synthesis approach. Finally, we illustrate the effectiveness of our results through two large-scale case studies.

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