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Lazy Abstractions for Timed Automata

机译:定时自动机的惰性抽象

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摘要

We consider the reachability problem for timed automata. A standard solution to this problem involves computing a search tree whose nodes are abstractions of zones. For efficiency reasons, they are parametrized by the maximal lower and upper bounds (LU-bounds) occurring in the guards of the automaton. We propose an algorithm that dynamically updates LU-bounds during exploration of the search tree. In order to keep them as small as possible, the bounds are refined only when they enable a transition that is impossible in the unabstracted system. So our algorithm can be seen as a kind of lazy CEGAR algorithm for timed automata. We show that on several standard benchmarks, the algorithm is capable of keeping very small LU-bounds, and in consequence is able to reduce the search space substantially.
机译:我们考虑定时自动机的可达性问题。该问题的标准解决方案涉及计算搜索树,其节点是区域的抽象。出于效率原因,它们由自动机保护装置中出现的最大上下限(LU界限)参数化。我们提出了一种算法,可在探索搜索树期间动态更新LU边界。为了使它们尽可能小,仅当边界启用了在抽象系统中不可能发生的过渡时,才对边界进行细化。因此,我们的算法可以看作是定时自动机的一种懒惰CEGAR算法。我们表明,在几个标准基准上,该算法能够保持非常小的LU边界,从而能够显着减少搜索空间。

著录项

  • 来源
    《Computer aided verification》|2013年|990-1005|共16页
  • 会议地点 Saint Petersburg(RU)
  • 作者单位

    Univ. Bordeaux, CNRS, LaBRI, UMR 5800, F-33400 Talence, France;

    Software Modeling and Verification Group, RWTH Aachen University, Germany;

    Univ. Bordeaux, CNRS, LaBRI, UMR 5800, F-33400 Talence, France;

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  • 正文语种 eng
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