Plant operation support system for diagnosing malfunction of plant
First Claim
1. A plant operation support system for diagnosing a malfunction in a plant and searching for a cause of the malfunction, the system comprising:
- a knowledge base for storing diagnosis knowledge, said diagnosis knowledge including a fault tree representing a correlation among phenomenons appearing in said plant and information for determining whether or not an abnormality arises with respect to each of the phenomenons;
means for inputting process data from said plant;
an inference engine for calculating, based on said process data and said knowledge base, reliability of an appearance of at least one particular phenomenon causally related to the malfunction to be diagnosed, and determining whether said at least one particular phenomenon has appeared based on the calculated reliability; and
means for controlling a display unit to display an appeared phenomenon corresponding to said at least one particular phenomenon of which appearance has been determined by said inference engine.
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Accused Products
Abstract
In response to an alarm, an inference engine in a plant operation support system calculates reliabilities of the appearance of phenomenons based on process data from the plant and a knowledge data base. The knowledge data base refers to diagnosis information and a fault tree. The value obtained from the calculation is compared with a threshold value inherent to each phenomenon. If the calculated value is larger than the threshold value, it is determined that the phenomenon has appeared. The appeared phenomenons are successively displayed on the screen of a display unit in order starting from the alarm phenomenon down to the subordinate phenomenons. An operation guidance corresponding to the displayed phenomenon is retrieved from a guidance data base and is displayed on the display unit.
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Citations
12 Claims
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1. A plant operation support system for diagnosing a malfunction in a plant and searching for a cause of the malfunction, the system comprising:
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a knowledge base for storing diagnosis knowledge, said diagnosis knowledge including a fault tree representing a correlation among phenomenons appearing in said plant and information for determining whether or not an abnormality arises with respect to each of the phenomenons; means for inputting process data from said plant; an inference engine for calculating, based on said process data and said knowledge base, reliability of an appearance of at least one particular phenomenon causally related to the malfunction to be diagnosed, and determining whether said at least one particular phenomenon has appeared based on the calculated reliability; and means for controlling a display unit to display an appeared phenomenon corresponding to said at least one particular phenomenon of which appearance has been determined by said inference engine. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A plant operation support system for diagnosing a malfunction in a plant and searching for a cause of the malfunction, the system comprising:
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a knowledge base for storing diagnosis knowledge, said diagnosis knowledge including a fault tree representing a correlation among phenomenons appearing in said plant and information for determining whether or not an abnormality arises with respect to each of the phenomenons; means for inputting process data from said plant; an inference engine for determining, based on said process data and said knowledge base whether or not each of the phenomenons having a causal relationship relative to said malfunction has appeared; a guidance data base for storing a plurality of guidance messages, each of said guidance messages having operation instructions corresponding to each phenomenon; and means for retrieving a particular guidance message corresponding to an appeared phenomenon corresponding to the at least one particular phenomenon of which appearance has been determined by said inference engine, and controlling a display unit to display said particular guidance message together with the appeared phenomenon. - View Dependent Claims (9, 10, 11, 12)
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Specification