Hierarchical supervisory control under partial observation: Normality

0579254 - MÚ 2024 RIV US eng J - Journal Article
Komenda, Jan - Masopust, T.
Hierarchical supervisory control under partial observation: Normality.
IEEE Transactions on Automatic Control. Roč. 68, č. 12 (2023), s. 7286-7298. ISSN 0018-9286. E-ISSN 1558-2523
R&D Projects: GA ČR(CZ) GC19-06175J; GA MŠMT(CZ) LTAUSA19098
Institutional support: RVO:67985840
Keywords : automata * complexity * discrete-event systems * controllability
OECD category: Automation and control systems
Impact factor: 6.8, year: 2022
Method of publishing: Limited access
https://doi.org/10.1109/TAC.2023.3257232

Conditions preserving observability of specifications between the plant and its abstraction are essential for hierarchical supervisory control of discrete-event systems under partial observation. Observation consistency and local observation consistency were identified as such conditions. To preserve normality, only observation consistency is required. Although observation consistency preserves normality between the levels for normal specifications, for specifications that are not normal, observation consistency is insufficient to guarantee that the supremal normal sublanguage computed on the low level and on the high level coincide. We define modified observation consistency, under which the supremal normal sublanguages of different levels coincide. We show that the verification of (modified) observation consistency is -hard for finite automata and undecidable for slightly more expressive models than finite automata. Decidability of (modified) observation consistency is an open problem. Hence we further discuss two stronger conditions that are easy to verify. Finally, we illustrate the conditions on an example of a railroad controller and on a case study of a part of an MRI scanner.
Permanent Link: https://hdl.handle.net/11104/0348100