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:
Oct. 14, 2008
Filed:
Apr. 19, 2005
Koichiro Matsumoto, Kariya, JP;
Tatsuya Kitanaka, Nagoya, JP;
Koichiro Matsumoto, Kariya, JP;
Tatsuya Kitanaka, Nagoya, JP;
Denso Corporation, Kariya, Aichi-Pref, JP;
Abstract
An angular speed detecting device is composed of a magnetic sensor unit connected to a rotating object and including a permanent magnet and a pair of magnetic sensor elements to generate a pair of signals and an electric computing unit that calculates an angular speed from the signals. The electric computing unit calculates the angular speed by the following steps: forming sine and cosine functions of an angle θ' from the signals; forming a saw-tooth curve of the angle θ′; forming a table showing plus or minus sign of the signals and the saw-tooth curve of the angle θ′ at a plurality of rotation angles of the rotating object; forming a pair of curves of output angles θand θin terms of 360-degree angular range by distinguishing rotation position of the rotating object from a combination of the plus, or minus sign of the signals and the saw-tooth curve of the angle θ′; and selectively using curves of the output angles θand θto calculate the angular speed of a rotating object.