Journal
COMPUTERS IN INDUSTRY
Volume 144, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.compind.2022.103797
Keywords
AGVs; Routing; Deadlock; Fault; Supervision; Robustness
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This paper proposes a two-stage zone-control architecture for bi-directional AGVs to avoid undesired situations and ensure path safety.
Automated Guided Vehicles (AGVs) are among the most popular automated transportation systems in flexible manufacturing systems (FMSs). Bi-directional AGVs are particularly efficient; nevertheless, their control is complex as they require effective routing procedures to avoid many undesired situations such as head-on con-flicts and deadlocks. This strongly limits their use in production and storage facilities, especially due to the lack of easy-to-implement control procedures. This paper proposes a new zone-control architecture of bi-directional AGVs based on two stages. Any route-computation method can be used in the first stage to minimise some performance criterion. The paper focuses on the second stage where the problem is formalised based on su-pervisory control theory (SCT) in order to secure AGVs paths. This hybrid architecture provides state-space reduction compared to similar SCT-based methods as demonstrated in the simulation study. It also ensures robust deadlocks-prevention in presence of disturbances in case AGVs are scheduled to avoid them.
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