Scheduling for a Large-Scale Production System Based on a Continuous and Timed Petri-Net Model

YoungWoo KIM  Akio INABA  Tatsuya SUZUKI  Shigeru OKUMA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E86-D   No.3   pp.583-593
Publication Date: 2003/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Theory/Models of Computation
Keyword: 
hybrid control,  large-scale production system scheduling,  hybrid Petri-net model,  RTA* algorithm,  LP,  

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Summary: 
This paper presents a new hierarchical scheduling method for a large-scale manufacturing system based on the hybrid Petri-net model, which consists of CPN (Continuous Petri Net) and TPN (Timed Petri Net). The study focuses on an automobile production system, a typical large-scale manufacturing system. At a high level, CPN is used to represent continuous flow in the production process of an entire system, and LP (Linear Programming) is applied to find the optimal flow. At a low level, TPN is used to represent the manufacturing environment of each sub-production line in a decentralized manner, and the MCT algorithm is applied to find feasible semi-optimal process sequences for each sub-production line. Our proposed scheduling method can schedule macroscopically the flow of an entire system while considering microscopically any physical constraints that arise on an actual shop floor.