arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2302.14565eess.SYcs.SY
收藏

安全临界系统的到达-避免控制器综合

Reach-avoid Controllers Synthesis for Safety Critical Systems

Bai Xue

摘要:

本文基于控制引导-障碍函数的概念,给出了由常微分方程建模的确定性系统和由随机微分方程建模的随机系统的避达控制器的综合充分条件。我们首先考虑确定性系统。给定一个开放的安全集,一个目标集和一个标称控制器,我们试图合成一个到达-避免控制器,它以最小的方式修改标称控制器,执行到达-避免目标,即,系统最终将进入目标集,同时在第一个目标命中时间之前停留在安全集内。提出了三种控制导引障碍函数,构造了三个相应的可综合避达控制器的条件,这些条件逐渐变弱,从而便于最优控制器的设计。第一个和第二个被称为指数和渐近控制制导障碍函数,它保证从安全集开始的每个轨迹将分别以指数速率和渐近方式进入目标集。然而,这两个控制导引障碍函数都有一个共同的条件,即在系统进入目标集之前,强制其每个正子水平集不变性,这个条件是严格的,从而限制了容许控制器的空间。因此,进一步发展了一种松弛控制导引-障碍函数,使得在系统进入目标集之前,只有安全集集是不变性的,从而扩展了容许控制输入的空间。然后,我们将确定性系统的方法扩展到随机系统,在概率环境下合成到达-避免控制器。最后,几个数值例子证明了所提出的方法的性能。

英文摘要:

In this paper we propose sufficient conditions to synthesizing reach-avoid controllers for deterministic systems modelled by ordinary differential equations and stochastic systems modeled by stochastic differential equations based on the notion of control guidance-barrier functions. We begin with considering deterministic systems. Given an open safe set, a target set and a nominal controller, we attempt to synthesize a reach-avoid controller, which modifies the nominal controller in a minimal way enforcing the reach-avoid objective, i.e., the system will enter the target set eventually while staying inside the safe set before the first target hitting time. Three control guidance-barrier functions are developed and three corresponding conditions for synthesizing reach-avoid controllers are constructed, which get progressively weaker and thus facilitate the optimal controller design. The first and second ones are termed exponential and asymptotic control guidance-barrier functions, which guarantee that every trajectory starting from the safe set will enter the target set respectively at an exponential rate and in an asymptotic way. However, it is observed that these two control guidance-barrier functions have one condition in common of enforcing invariance of its every positive sublevel set until the system enters the target set, which is strict and thus limits the space of admissible controllers. Consequently, a lax control guidance-barrier function is further developed such that only the safe set set is an invariance before the system enters the target set, expanding the space of admissible control inputs. Then, we extend the methodologies for deterministic systems to stochastic systems, which synthesize reach-avoid controllers in the probabilistic setting. Finally, several numerical examples demonstrate the performance of proposed methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑