Title:
DIAGNOSING METHOD OF FAULT
Document Type and Number:
Japanese Patent JP3046870
Kind Code:
B2
Abstract:
PURPOSE: To make it possible to execute diagnosis of a fault in accordance with the kind of vehicle, in a wide scope and with excellent precision, on the occasion of the diagnosis of the fault of the vehicle of which a plurality of functional components are correlated with each other.
CONSTITUTION: Weights corresponding to the degree of correlation are set respectively for two functional components correlated with each other. A detected value from each sensor is converted into a membership value showing the degree of abnormality. With each sensor used as a starting point, membership values thus obtained are subjected to weighting computation in accordance with the degree of correlation between the functional components for each system of the correlated functional components, and based on the results of computation for each system, the state of a fault of the functional component is inferred. Besides, the state of the fault of the functional component is inferred by collating the membership values with a rule based on empirical laws, for the discrete kind of vehicle. A numerical value showing the result of this inference and a numerical value showing the result of inference obtained by the foregoing inference process are added up for each functional component, and based on the result of the addition, the functional component in a faulty state is specified.
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Inventors:
Haruhiro Hirano
Application Number:
JP30660691A
Publication Date:
May 29, 2000
Filing Date:
October 25, 1991
Export Citation:
Assignee:
Mazda Corporation Inc
International Classes:
F02B77/08; F02D45/00; G01M15/00; G01M15/04; G01M17/007; G05B23/02; G06F9/44; G06F11/22; G06N5/04; G06N7/02; (IPC1-7): G01M15/00; G01M17/007; G05B23/02; G06F9/44
Domestic Patent References:
| JP3152627A | ||||
| JP2181617A | ||||
| JP2133900A | ||||
| JP223703U |
Attorney, Agent or Firm:
Masaaki Fukuoka