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. 20, 2012
Filed:
Mar. 31, 2009
Hirofumi Uenoyama, Kitanagoya, JP;
Hirofumi Uenoyama, Kitanagoya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A rotation detection apparatus for detecting a rotation state of a gear is disclosed. The rotation detection apparatus includes a magnetic sensor, a magnetic filed generation unit, and a self-diagnosis unit. The sensor includes: a bias magnet for generating a bias magnetic field extending toward the gear; and a magnetic-electric conversion element for sensing the bias magnetic field acting thereon. When the gear is in a stationary state, the magnetic filed generation unit generates a diagnosis use magnetic field extending toward the magnetic-electric conversion element. The self-diagnosis unit determines whether the magnetic sensor has a failure based on an output from the magnetic-electric conversion element that is subjected to the bias magnetic field and the self-diagnosis use magnetic field.