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. 13, 2009
Filed:
May. 30, 2007
Mitsuhiko Nishimoto, Kashihara, JP;
Eiki Sugimoto, Okazaki, JP;
Mitsuhiko Nishimoto, Kashihara, JP;
Eiki Sugimoto, Okazaki, JP;
JTEKT Corporation, Osaka, JP;
Abstract
An abnormality judging apparatus of a rotation angle detecting apparatus generating a sine wave signal and a cosine wave signal according to the rotation angle of a rotor is provided with an interface which receives the sine wave signal, an interface which receives the cosine wave signal, a signal arithmetic circuit which successively calculates the sum of each square of the received sine wave signal and cosine wave signal, a memory which stores as a threshold value the value of the sum of each square of the sine wave signal and cosine wave signal received from the rotation angle detecting apparatus at a predetermined point in time, and a judging circuit which judges that abnormality has occurred at the rotation angle detecting apparatus when the difference between the value calculated by the signal arithmetic circuit and the value stored in the memory is out of a predetermined range.