Safety instrument system based on D-S (Dempster/Shafer) evidence theory

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

Inactive Publication Date: 2013-03-13
SOUTHWEST UNIV
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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

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  • Safety instrument system based on D-S (Dempster/Shafer) evidence theory
  • Safety instrument system based on D-S (Dempster/Shafer) evidence theory
  • Safety instrument system based on D-S (Dempster/Shafer) 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 certain 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 as...

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Abstract

The invention discloses a safety instrument system based on D-S (Dempster / Shafer) evidence theory. The safety instrument system comprises a sensor, a logic decision system and a performing unit, wherein the logic decision system comprises an input circuit, a processor, an output circuit, and a diagnosis module based on the D-S evidence theory; and the diagnosis module based on the D-S evidence theory is used for improving the reliability of the diagnosis basis through the calculation based on the D-S evidence theory in a multi-channel logical decision system according to the related feedback information among the channels. By adopting the safety instrument system based on the D-S evidence theory, the self-diagnosis function of the system can be realized through fewer hardware devices; and the safety instrument system based on the D-S evidence theory has the advantages of being lower in cost and higher in 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...

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Application Information

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