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Petri-network-based control method for automatic manufacture system

A technology for automatic manufacturing systems and control methods, applied in general control systems, control/regulation systems, program control, etc., can solve problems such as state explosion, system stagnation, resource failure, etc., to improve concurrency and avoid blocking states , the effect of smooth processing

Active Publication Date: 2015-11-04
XIDIAN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] In the past few decades, many researchers have studied various deadlock prevention strategies. Traditional deadlock prevention schemes are often based on global information, and inevitably need to enumerate all reachable states, which leads to state explosion problems. , and for the convenience of research, most researchers assume that the resources in the system will not fail, but the reality is just the opposite
Any small problem can cause resource failure, which may bring the entire system to a standstill

Method used

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  • Petri-network-based control method for automatic manufacture system
  • Petri-network-based control method for automatic manufacture system

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Definition 1: A production Petri net Product Petri Net (PPN) is a strongly connected ordinary Petri net (PN), N = (P, T, F), where:

[0029] 1) P=P 0 ∪P A ∪P R ,P 0 ,P A ,P R Respectively represent free warehouse, active warehouse and resource warehouse. and j∈N K ,i≠j, P R ={r i ,i∈N L}. N K , N L are all sets of natural numbers, N K ={1,2,3,...,K},N L ={1,2,3,...,L};

[0030] 2) and j∈N K ,i≠j,

[0031] 3) Depend on subnet is a strongly connected state machine such that each loop contains |p · |=1.

[0032] 4) ·· p∩P R =p ·· ∩P R , and | ·· p∩P R |=1.

[0033] 5) and represent reliable resources and unreliable resources, respectively,

[0034] Definition 2: r ∈ P R is a resource pool, H(r)=r ·· ∩P A Indicates the set of places where resource r is used.

[0035] Defin...

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Abstract

The invention provides a petri-network-based control method for an automatic manufacture system. Through operation of a deadlock avoidance algorithm, a robustness enhancing algorithm and a concurrency improving algorithm, a group of transition set can be produced. Any transmission of transmission belonging to the set can meet requirements for zero deadlock, robustness and system concurrency improvement. After each transition is transmitted, the three algorithms need to be calculated again successively and a new transition set is produced. Through said circulation, a group of event sequence is produced dynamically in real time. According to the invention, when resource faults of a system occur, programs that do not need the fault resources are not blocked by programs that need the fault resources, so that smooth processing can continue and system concurrency can be improved.

Description

technical field [0001] The invention belongs to the technical field of automatic manufacturing systems, and relates to a control method of an automatic manufacturing system based on Petri nets. Background technique [0002] The manufacturing level is an important symbol of a country's industrialization level, and the manufacturing industry is also an important foundation for the stable development of a country's economy, especially a densely populated developing country like China. In the past few decades, with the wide application of information technology, automation technology and computer technology, the traditional manufacturing system has been gradually transformed into an automatic manufacturing system, thereby greatly reducing manufacturing costs, improving product quality and ensuring production safety. For the automatic manufacturing system, the most important premise is no deadlock, and all other performances are based on the system without deadlock. [0003] In ...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCG05B19/418G05B2219/32165Y02P90/02
Inventor 胡核算承艳
Owner XIDIAN UNIV
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