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US 5,631,656 AGranted
Fail safe system with common mode avoidance
AssigneeHoneywell Inc.
InventorsRandolph G. Hartman, Robert D. Girts
Life of this patent
Estimating the term…
Abstract
A fail operational system including two sets of first and second sensors responsive to different stimuli to produce signals indicative of a condition, and a comparator for comparing the outputs of the first and second sensors to produce a "valid" signal when the outputs are substantially the same.
Claims7
A fully monitored system comprising:
- a first sensing unit responsive to a first set of variables to produce a first output indicative of a condition;
- a second sensing unit responsive to a second set of variables different from the first set of variables to produce a second output indicative of the condition;
- comparing means receiving the first and second outputs and producing a valid output only if the first and second outputs are substantially the same.
Dependencies are inferred from the claim text.