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Safety Instrumented System Based on d-s Evidence Theory

A technology of safety instrumented system and evidence theory, applied in the field of safety instrumented reliability control system, can solve the problems of rising cost, complex diagnosis circuit, logic voting system without self-diagnosis mechanism, etc.

Inactive Publication Date: 2014-10-08
SOUTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] It can be seen from this that in the existing safety instrumented system, the logic voting system either does not have a self-diagnosis mechanism or has a complicated diagnostic circuit, resulting in an increase in cost. A safety instrumented system with self-diagnostic function that realizes high availability and high safety based on diagnosis

Method used

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  • Safety Instrumented System Based on d-s Evidence Theory
  • Safety Instrumented System Based on d-s Evidence Theory
  • Safety Instrumented System Based on d-s Evidence Theory

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Embodiment Construction

[0052] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0053] In this embodiment, the 1oo2 logic structure is adopted. For each channel, there are two definite states {reliable}, {unreliable} and one uncertain state {unknown}, among which {reliable} and {unreliable} It means that for channel one, channel two gives the same conclusion, and they are represented by {1} and {0} respectively, while {unknown} means that for channel one, channel two gives the opposite conclusion, and use { 0, 1} means and vice versa.

[0054] (1) The state space determination module determines the state space according to the dual-channel structure, and composes the state into an identification framework ; Then these states constitute the identification framework: . .

[0055] (2) According to the reliability of each channel, the function establishment module identifies the frame power set The basic probability a...

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Abstract

The invention discloses a safety instrument system based on D-S evidence theory, which includes a sensor, a logic voting system and an execution unit, and the logic voting system includes an input loop, a processor, an output loop, and a diagnosis module based on D-S evidence theory; In the multi-channel logic voting system, the diagnosis module based on the D-S evidence theory improves the reliability of the diagnosis basis through the calculation based on the D-S evidence theory according to the interrelated feedback information between the channels; The theoretical safety instrumented system can realize the self-diagnosis function of the system under the premise of using less hardware equipment, and has the advantages of low cost, high reliability and safety.

Description

Technical field [0001] The invention is the field of reliability control of the industrial security instrument system, and specially involves a security instrumental control system based on D-S. The theory of evidence. Background technique [0002] The Safety Instrument System (SIS), also known as the Safety Interlock System, is mainly the alarm and interlocking part in the factory control system.The stop control is an important part of the automatic control of factory enterprises. [0003] SIS executes its security control function on time and correctly before the hazardous event, thereby avoiding or reducing the occurrence of accidents, but the failure of SIS's function will cause its security control function to be unable to realize.The international standard IEC 61508 provides several methods to achieve functional security. The simple and efficient method is the logical voting system Moon (N selected M). [0004] 1oo1 system figure 1 It is shown that the system does not provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 潘东波刘枫
Owner SOUTHWEST UNIV
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