The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1998
Filed:
May. 15, 1995
Lloyd R Tomlinson, Renton, WA (US);
Robert E Freeman, Kent, WA (US);
The Boeing Company, Seattle, WA (US);
Abstract
A signal selection and fault detection system receives multiple redundant sensor input signals that are processed through an equalizing and selecting network which outputs the midvalue signal. The system provides a variable fault monitoring threshold that provides the ability to detect for oscillatory faults among input signals that are less than 10% of static tracking tolerances for the inputs, while also assuring that nuisance fault detections are very improbable. The system provides a variable equalization rate that assures satisfactory blocking of oscillatory faults under dynamic conditions when signal disagreements are increased by gain tolerances between the input signals, and maintains high signal resolution of the output under such dynamic conditions. The system also provides cross-channel equalization of the selected midvalue signal in all operating channels to assure that all channels provide the same steady state output for only two input operation, while also maximizing fault blocking capability.