HP Labs Technical Reports

Signal Interpretation for Monitoring and Diagnosis: A Cooling System Testbed

Manders, Eric; Biswas, Gautam; Mosterman, Pieter; Barford, Lee; Ram, Vishnu; Barnett, Joel

HPL-1999-36

Keyword(s): signal processing; qualitative reasoning; diagnosis; derivative; signal interpretation; signal classification

Abstract: We present our framework for monitoring and diagnosis. The framework is based on interaction between a qualitative diagnosis engine and a monitoring component that performs a signal to symbol transformation on the signals. We have applied the methodology to a real system, the cooling system of an automobile engine on which we have installed thermocouples and pressure sensors. Faults can be introduced into the cooling system in a controlled manner. We show that a combination of linear approximation techniques and statistical signal processing can provide robust symbolic signal values for the diagnosis algorithms.

6 Pages

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