単調系におけるロバスト制御不変集合のリアルタイム合成
Real-Time Synthesis of Robust Controlled Invariant Sets for Monotone Systems
単調力学系の安全仕様に対し、閾値関数再定式化により制御不変集合を並列計算で高速合成する手法を提案し、大規模グリッドでのオンライン再合成を実現した。
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著者: Yasin Sonmez, Mahmoud Khaled, Majid Zamani, Murat Arcak
分類: eess.SY, cs.AI, cs.RO
原文アブストラクト
Safety-critical control of autonomous systems requires formal safety certificates, such as controlled invariant sets, that must be computed online as conditions change. Although standard synthesis algorithms scale poorly with state dimension, monotone dynamical systems with lower-closed safety specifications allow for accelerated computation of controlled invariant sets. In particular, lazy fixed-point algorithms exploit monotonicity and track only the antichain basis of the set. However, membership tests and redundancy checks against an evolving basis remain major bottlenecks. We introduce a threshold-function reformulation in which a lower-closed set on a d-dimensional grid is represented by its column heights along a designated axis. This reformulates the greatest-fixed-point iteration as independent one-dimensional binary searches, one per grid column, yielding an embarrassingly parallel iteration with asymptotically lower computational complexity than the lazy fixed-point algorithm. Experiments synthesize invariant sets on 3D grids with 10^9 cells in under 50 ms and 10^14 cells in under two minutes. We further demonstrate online re-synthesis in a safety-informed model predictive controller example.