DEVELOPING FAULT MODEL FROM UNSTRUCTURED TEXT DOCUMENTS
First Claim
1. A method for creating a fault model for a hardware or software system, said method comprising:
- providing an unstructured text document containing diagnostic information about the hardware or software system;
extracting descriptive terms from the unstructured text document using an ontology and heuristic rules;
classifying the descriptive terms into types;
merging phrases in the descriptive terms which mean the same thing but are worded differently; and
assembling the fault model from the descriptive terms.
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Abstract
A method and system for developing fault models from unstructured text documents, such as text verbatim descriptions from customers and service technicians. An ontology, or data model, and heuristic rules are used to identify and extract descriptive terms from the text verbatim document. The descriptive terms are then classified into types, including symptoms, failure modes, and parts. Like-meaning but differently-worded descriptive terms are then merged using text similarity scoring techniques. The resultant symptoms, failure modes, parts, and correlations are then assembled into a fault model, which can be used for real-time fault diagnosis onboard a vehicle, or off-board at service shops.
11 Citations
20 Claims
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1. A method for creating a fault model for a hardware or software system, said method comprising:
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providing an unstructured text document containing diagnostic information about the hardware or software system; extracting descriptive terms from the unstructured text document using an ontology and heuristic rules; classifying the descriptive terms into types; merging phrases in the descriptive terms which mean the same thing but are worded differently; and assembling the fault model from the descriptive terms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for creating a fault model for a vehicle or a vehicle sub-system, said method comprising:
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providing a text verbatim document from a customer or a service technician, said document containing diagnostic information about the vehicle or the vehicle sub-system; extracting descriptive terms from the text verbatim document using an ontology and heuristic rules; classifying the descriptive terms into types, where the types include Diagnostic Trouble Code (DTC) symptoms, non-DTC symptoms, failure modes, and parts; merging phrases in the descriptive terms which mean the same thing but are worded differently; and assembling the fault model from the descriptive terms. - View Dependent Claims (12, 13, 14)
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15. A system for creating a fault model, said system comprising:
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means for providing an unstructured text document containing diagnostic information about a hardware or software system; means for extracting descriptive terms from the unstructured text document using an ontology and heuristic rules; means for classifying the descriptive terms into types; means for merging phrases in the descriptive terms which mean the same thing but are worded differently; and means for assembling the fault model from the descriptive terms. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification