Supervisor Localization of Timed Discrete-Event Systems Under Partial Observation

Abstract

We study supervisor localization for timed discrete-event systems under partial observation in the Brandin–Wonham framework. First, we employ timed relative observability to synthesize a partial-observation monolithic supervisor; the control actions of this supervisor include not only disabling action of prohibitible events (as that of controllable events in the untimed case) but also “clock-preempting” action of forcible events. Accordingly, we decompose the supervisor into a set of partial-observation local controllers one for each prohibitible event, as well as a set of partial-observation local preemptors one for each forcible event. We prove that these local controllers and preemptors collectively achieve the same controlled behavior as the partial-observation monolithic supervisor does. The above-mentioned results are illustrated by a timed workcell example.