Departmental Papers (CIS)

Document Type

Conference Paper

Date of this Version

April 2003

Comments

Postprint version. Published in Lecture Notes in Computer Science, Volume 2623, Hybrid Systems: Computation and Control, (HSCC 2003), pages 4-19.
Publisher URL: http://www.springerlink.com/link.asp?id=l66mrr28aknv91dd

Abstract

Predicate abstraction has emerged to be a powerful technique for extracting finite-state models from infinite-state systems, and has been recently shown to enhance the effectiveness of the reachability computation techniques for hybrid systems. Given a hybrid system with linear dynamics and a set of linear predicates, the verifier performs an on-the-fly search of the finite discrete quotient whose states correspond to the truth assignments to the input predicates. To compute the transitions out of an abstract state, the tool needs to compute the set of discrete and continuous successors, and find out all the abstract states that this set intersects with. The complexity of this computation grows exponentially with the number of abstraction predicates. In this paper we present various optimizations that are aimed at speeding up the search in the abstract state-space, and demonstrate their benefits via case studies. We also discuss the completeness of the predicate abstraction technique for proving safety of hybrid systems.

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Date Posted: 13 December 2005