Sensor fault detection system

Details Sensor fault detection system Sensor fault detection system

1998-01-12

2000-01-18

Shah, Kamini

Data processing: measuring, calibrating, or testing

Testing system

Of sensing device

702 60, 702179, 702189, 702191, 376215, G05B 902, G06F 700

Patent

active

060164654

ABSTRACT:
The sensor fault detector is one in which each sensor signal is compared with a reference signal provided by e.g. a model of the system being monitored. Prior art sensor fault detectors subtract the output of the sensor and the corresponding reference signal from each other, and a fault is declared when the residual difference exceeds a prescribed threshold. However, modelling errors (such as scaling discrepancies), d.c bias and noise mean that faults are often wrongly declared, or alternatively that only large faults can be detected. These problems are overcome according to the invention by comparing the "shape" of the sensor signal with that of the corresponding reference signal (i.e. comparing the signal outlines) over a finite time window, using e.g. correlation techniques. A fault is declared when the shapes differ by a prescribed amount.

REFERENCES:
patent: 5459675 (1995-10-01), Gross et al.

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