Methods and apparatus for system fault diagnosis and control
Patent 4649515 Issued on March 10, 1987. Estimated Expiration Date: 
July 1, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 1, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesServicing a software-controlled elevator Multiprocessor supervisory control for an elevator system Patent #: 4567560 InventorsAssigneeApplicationNo. 06/881499 filed on 07/01/1986US Classes:706/52, Reasoning under uncertainty (e.g., fuzzy logic)700/79, Having protection or reliability feature706/48, Having specific pattern matching or control technique706/903, Control706/910, Elevator706/911, Nonmedical diagnostics706/918, Elevator714/26Artificial intelligence (e.g., diagnostic expert system)ExaminersPrimary: Zache, Raulfe B.Attorney, Agent or FirmInternational ClassesG06N 5/00 (20060101)G06F 11/25 (20060101) G06N 5/04 (20060101) G01R 31/3183 (20060101) G01R 31/28 (20060101) AbstractMethod and apparatus for monitoring and diagnosing sensor and interactive based process systems. The knowledge base concerning the process system per se is in the form of a list stored in memory, which list includes domain specific rules in evidence-hypothesis form. This domain dependent information is devoid of means for interconnecting the rules to perform diagnostic services. A completely domain independent set of meta-level rules is stored in memory, which, in response to sensor and/or user input, searches the knowledge base and effectively constructs a rule network through which belief is propagated, to detect and report malfunctions, to output control signals for modifying the operation of the monitored system, and to aid users by providing information relative to malfunctions which pinpoints probable causes. The domain independent rules, in addition to the meta-level rules which search the knowledge base and interconnect domain specific rules, includes procedural rules for choosing which of the meta-level rules to apply when there is a choice. The procedural inference rules are independent and distinct from the meta-level rules which manipulate the knowledge base.Other References
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