Sensor fault detection by activity monitoring

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

1980-06-26

1982-06-29

Wise, Edward J.

Boots, shoes, and leggings

364432, 364571, G06G 778, G06F 1520

Patent

active

043375162

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 indicating a fault (15, 117) in the event that the difference 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) whenever 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.

REFERENCES:
patent: 3584507 (1971-06-01), Hohenberg
patent: 3593012 (1971-07-01), Lang
patent: 3678256 (1972-07-01), Harenberg
patent: 3750465 (1973-08-01), Howell et al.
patent: 3867717 (1975-02-01), Moehring et al.
patent: 3872292 (1975-03-01), Dawson, Jr.
patent: 4176396 (1979-11-01), Howatt

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