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A distributed control method for automated manufacturing systems with assembly operations

An automatic manufacturing system, distributed control technology, applied in general control systems, control/regulation systems, program control, etc., to avoid exhaustive state space, reduce traffic, and ensure no deadlock.

Active Publication Date: 2018-02-02
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether it is based on reachability graph or system structure, it is difficult to apply these methods to large-scale automated manufacturing systems due to computational complexity.

Method used

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  • A distributed control method for automated manufacturing systems with assembly operations
  • A distributed control method for automated manufacturing systems with assembly operations
  • A distributed control method for automated manufacturing systems with assembly operations

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] In the present invention, a distributed control method is proposed based on the automation system with assembly operation, and the dynamic search method is used to realize active distributed control online. Each process between the shunting operation and the assembly operation in the present invention is called a parallel process.

[0034] Firstly, the places in F-AMG are divided into key places and ordinary places. According to the definition of key places in the paper "DistributedSupervisor Synthesis for Automated Manufacturing Systems Using Petri Nets", if the various work stages of a process are executed sequentially, then the present invention will use the work stage with the smallest or greatest demand for resources Defined as a key place. In F-AMG, the various working stages are not completely connected sequentially. As mentio...

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Abstract

Provided is a distributed control method for an automatic manufacturing system with assembly operation. A change set composed of changes which can be enabled in a state M is detected first, and when detection of all the changes in a TEN is completed, a finally output TCN is a set of changes ensuring deadlock-free running of a system in the state M; any change is excited to obtain a new state, and a set of changes ensuring deadlock-free running of the system in the state is judged; and the steps are repeated, and finally, an emission sequence for ensuring deadlock-free running of the system is obtained. According to the invention, a Petri network is used as a mathematical tool to avoid an exhaustive state space, reduce the complexity of the algorithm and realize efficient control on a huge system. A dynamic, online and distributed control mode is adopted to observe and control the local state, thereby ensuring the deadlock-free performance of the whole system.

Description

technical field [0001] The invention belongs to the technical field of automatic manufacturing systems, and relates to a distributed control method for automatic manufacturing systems with assembly operations. Background technique [0002] In order to quickly respond to market changes and meet emerging customer needs, scientists have developed automatic manufacturing systems. Usually, an automatic manufacturing system consists of multiple processing processes, which complete their respective processing tasks concurrently according to their respective process plans. During the execution of these processes, some resources (such as buffers, material transportation equipment, etc.) are often needed to assist their completion. In practice, these resources are limited, which makes them have to be shared by these processes. However, such a processing environment can easily cause deadlock. Once a deadlock occurs, the system will stagnate in production, resulting in serious or eve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/042G05B2219/25232
Inventor 胡核算杨妍
Owner XIDIAN UNIV
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