Decentralized Supervisory Control of Discrete Event Systems: involving the fusion system in the decision-making

In the decentralized control of Discrete Event Systems, a set of supervisors take enabling/disabling decisions which can be fused for deducing actual decisions. The first architecture that has been developed for decentralized control is referred to as the conjunctive architecture. Several more general architectures have subsequently been proposed. We propose a new architecture, whose basic principle is as follows: for every event which is controllable by several supervisors, each of the latter takes an enabling/disabling decision only when it is sure that this is the right decision which can be applied to the plant. Otherwise, the supervisor transmits its local information to the fusion system which will thus be involved in the enabling/disabling decision-making. We compare our approach with the previous decentralized approaches.