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:
Mar. 03, 2015
Filed:
Jun. 12, 2012
John M. Pigott, Phoenix, AZ (US);
Fred T. Brauchler, Canton, MI (US);
William E. Edwards, Ann Arbor, MI (US);
Mike R. Garrard, Jaywick, GB;
Randall C. Gray, Tempe, AZ (US);
John M. Hall, Chelsea, MI (US);
John M. Pigott, Phoenix, AZ (US);
Fred T. Brauchler, Canton, MI (US);
William E. Edwards, Ann Arbor, MI (US);
Mike R. Garrard, Jaywick, GB;
Randall C. Gray, Tempe, AZ (US);
John M. Hall, Chelsea, MI (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A variable reluctance sensor system for processing a variable reluctance sensor signal including an arming comparator and an arming circuit. The arming comparator compares the variable reluctance sensor signal with an arming threshold which decreases proportional to 1/t from a predetermined maximum level and asserts an armed signal when the variable reluctance sensor signal reaches the arming threshold. The arming threshold may be decreased based on a scaling factor multiplied by 1/t to ensure detection of each pulse of the variable reluctance sensor signal. The arming threshold may decrease to a predetermined minimum level sufficiently low to intersect the variable reluctance sensor signal and sufficiently high relative to an expected noise level. The arming threshold is reset in response to a timing event, such as zero crossing of the variable reluctance sensor signal.