Patent
Deciding system for cause of plant fault
Katsuichi Kishi,Yukio Nagaoka +1 more
TLDR
In this article, a fault cause tree is used to analyze the cause of a fault in a fault detection system and the change of data before the fault is detected in the occurrence of the fault.Abstract:
PURPOSE:To treat a fault effectively while relieving an operator from the load of investigating the cause, by obtaining information effective to the investigation on the cause of the fault from the change of data before the fault is detected in the occurrence of the fault. CONSTITUTION:Data of each plant up to the detection of a fault by a fault detector 3 is stored previously as a fault cause tree 10, and a data change table 9 containing the tree 10 and the change of data before the fault is detected, and a secular value table 8 recording data in the detection of the fault are used to analyze the cause of the fault. Then, a fault cause deciding device 6 analyzes the cause of the fault from the tree 10 and the result of it is displayed 7. Here, the tree is displayed to display the change and path of the plant data understandably. Since the time when the data changed is also stored in the table 9, it is displayed simultaneously. Consequently, a plant fault is treated rapidly and adequately.read more
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Patent
Plant fault diagnosis system
Toshihiko C,O Hiroshima Technical Inst. Niinomi,Shigeru Kaseda,Koichi Takahashi,Ryohei C,O Mitsubishi Jukogyo K.K. Funakoshi +5 more
TL;DR: In this article, a plant fault diagnosing system for diagnosing the operating conditions of the plant, for example, change in the physical quantity or whether any fault is present in each of the instrumentations or not.
Patent
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Operation of compound non-linear process controller
TL;DR: In this article, a decision tree analysis of selected system parameters is used to generate a representation of the real-time system status, which is presented to the operator either in the form of conclusory indications, such as verbal statements, representative of system status; or in a visual display of the entire decision tree including indications of the path through the tree representative of current conditions.
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Plant operation supporting device
TL;DR: In this article, the authors propose a process calculating mechanism for calculating the material balance and the heat balance of a plant, a presuming mechanism of causes and places of abnormalities, and a data transmitting mechanism connected with such mechanisms.