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In our previous work, a framework for the hierarchical design of discrete event systems has been introduced that is based on a notion of inputs and outputs. I/O-plant models describe the interaction of each subsystem with the operator (or controller) and the environment. By alternation of subsystem composition and controller synthesis, a hierarchy of controllers is obtained that complements a hierarchy...
Recently, several efficient modular and hierarchical approaches for the control of discrete event systems (DES) have been proposed. Although these methods are very suitable for dealing with the state space explosion problem, their common limitation is that either maximal permissiveness is not addressed or unnecessarily restrictive conditions are required in order to ensure maximally permissive control...
We propose a framework for the hierarchical design of discrete event systems that addresses both safety and liveness properties. Technically, we build on a notion of inputs and outputs that is closely related to J.C. Willems' behavioural systems theory. We develop a structural admissibility condition that allows for abstraction-based controller synthesis similar to previous work on hybrid control...
The paper extends previous work, where we develop a control theory for nonblocking hierarchical control of decentralized discrete event systems (DES). The results are based on two technical conditions for the hierarchical abstraction: it has to be (i) locally nonblocking and (ii) marked string accepting. In this paper, we investigate the systematic construction of the hierarchical abstraction. Starting...
This contribution investigates the hierarchical control of decentralized DES which are synchronized by shared events. A multi-level hierarchical control architecture providing hierarchical consistency is introduced. Moreover, it allows for composition of decentralized subsystems on the high-level of the hierarchy, and hence reduces the computational complexity of supervisory control synthesis for...
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