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. 17, 2006
Filed:
Apr. 15, 2005
Takatsugu Asano, Toyohashi, JP;
Toshio Kohno, Nagoya, JP;
Takatsugu Asano, Toyohashi, JP;
Toshio Kohno, Nagoya, JP;
FAVESS Co., Ltd., Okazaki, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
The invention provides an electric power steering apparatus which can detect a ground fault of an angular resolver without fault. Values of a first resistance (R), a second resistance (R), a third resistance (R) and a fourth resistance (R) are set such that a difference between a minimum output potential (Vout Min) of a first differential amplifier (OP) at a time when an angular resolver is not in a ground fault which may be generated on the basis of a dispersion of the first resistance (R), the second resistance (R), the third resistance (R) and the fourth resistance (R), and a direct-current resistance component (Rdc) of the angular resolver, and a maximum potential (Vout Max) at a time when the angular resolver is in the ground fault becomes equal to or more than a predetermined margin for preventing an erroneous ground fault detection in a CPU () side. Accordingly, it is possible to detect the ground fault of the angular resolver on the basis of an output potential (Vout) of the first differential amplifier (OP) without fault.