Sensor fault detection by activity monitoring

Details Sensor fault detection by activity monitoring Sensor fault detection by activity monitoring

G - Physics

08

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G08B 29/00 (2006.01) G01D 18/00 (2006.01) G01R 19/00 (2006.01) G01R 31/02 (2006.01) G01R 31/28 (2006.01) G05D 1/00 (2006.01)

Patent

CA 1164067

Sensor Fault Detection By Activity Monitoring Abstract Faults in a sensor (10) are detected by excess rate fault determination by taking the differentiated (58, 107), rate limited (60, 100, 111) integral (64, 112) from the raw sensor output (72, 113) and indi- cating a fault (15, 117) in the event that the dif- ference exceeds a predetermined magnitude (76, 114). A null fault (22, 91) is provided in the event that the sensor output does not show a significant change (52, 88) within a given time interval (20, 80) when- ever a related sensor (31) indicates (29, 84) that the first sensor (10) should have measurable activity. Both analog (Fig. 1) and digital (Fig. 2, Fig. 3) embodiments are disclosed.

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