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Qualitative dynamic diagnosis of circuits

Published online by Cambridge University Press:  27 February 2009

Alessandra Fanni ,
Paolo Diana ,
Alessandro Giua  and
Marco Perezzani
Alessandra Fanni
Affiliation:
Istituto di Elettrotecnica, Facoltà di Ingegneria Università di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
Paolo Diana
Affiliation:
Istituto di Elettrotecnica, Facoltà di Ingegneria Università di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
Alessandro Giua
Affiliation:
Istituto di Elettrotecnica, Facoltà di Ingegneria Università di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
Marco Perezzani
Affiliation:
Istituto di Elettrotecnica, Facoltà di Ingegneria Università di Cagliari, Piazza d'Armi, 09123 Cagliari, Italy
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Abstract

We describe ACDS, an automatic diagnostic system. ACDS is capable of diagnosing faults on analog circuits in dynamic conditions. The circuit's dynamic behavior is studied by means of a series of intrastate simulations during which the qualitative state of the circuit does not change. An acquistion board collects the value of a set of quantities corresponding to accessible test points. These measurements are converted into qualitative values and are used for two purposes: first, to determine the state of the circuit components; second, to trigger the diagnostic procedure whenever a discrepancy between observed and predicted behavior is found. The main difficulty in this phase of measurement interpretation is in obtaining meaningful numerical-qualitative data conversion for values of quantities approaching a boundary between two different qualitative intervals. System performance has been verified through a number of simulations, which have shown the proposed approach to be efficient both in terms of localized faults and of flexibility in adapting to different circuits.

Type
Research Article
Information
AI EDAM , Volume 7 , Issue 1 , February 1993 , pp. 53 - 64
Copyright
Copyright © Cambridge University Press 1993

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