Diagnostic tolerance for missing sensor data

Abstract For practical automated diagnostic systems to continue functioning after failure, they must not only be able to diagnose sensor failures but also be able to tolerate the absence of data from the faulty sensors. We show that conventional (associational) diagnostic methods will have combinatoric problems when trying to isolate faulty sensors, even if they adequately diagnose other components. Moreover, attempts to extend the operation of diagnostic capability past sensor failure will necessarily compound those difficulties. By contrast, the algorithmic methods of model-based reasoning have no special problems diagnosing faulty sensors and can operate gracefully when sensor data is missing.

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