A synthesis approach to distributed supervisory control design for manufacturing systems with Grafcet implementation

Time-Based Estimator for Control Reconfiguration of Discrete Event Systems (DES)

“…Several approaches discussed the control reconfiguration issue for a centralized [24], hierarchical [25], decentralized [26], or distributed control [27], [28]. Although these approaches may have solved the reconfiguration problem, they nevertheless rely on material redundancy to fill the failure of a system component.…”

“…In our short-term works, a library of time-based estimators of different type of cylinders with their associated sensors will be proposed. Furthermore, an approach of control reconfiguration of DES based on SCT will be proposed too, the method is based on a distributed control exploiting the fact that MS are informally distributed [28].…”

Timed Synthesis Control Approach for Tolerant-Fault Control of Discrete Event Systems (DES)

“…Based on works evoked in [5] and [16], we propose an extended approach to synthesis timed local controllers TLC, with a method allowing their obtaining using Supremica software by the following steps:…”

“…Although this approach is very formal, it shows a major disadvantage of its use on complex systems: the combinatorial explosion. In [3], [4], [5], [6] and [7], some approaches for control synthesis of DES have been proposed to overcome this problem. Although these approaches may have reduced the combinatorial explosion problem, they nevertheless remain dependent on Boolean information.…”

“…However, taking into account the passage of time makes the modeling step as well as the synthesis of the control by supervision more complex. To overcome these difficulties, we propose an extension of control synthesis approach proposed in [5] by exploiting its distributed design and introducing the time factor in the first stages of modeling.…”