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:
Aug. 08, 2006
Filed:
Apr. 05, 2005
Kazumasa Kodama, Toyota, JP;
Kazumasa Kodama, Toyota, 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 in which a dead zone is not generated even at a low duty ratio while slow starting a switching element. When a duty ratio of a PWM control becomes more than a preset value (NO in S), a switching cycle is set to a predetermined value (a fixed value) (S). When the duty ratio becomes equal to or less than the preset value (Yes in S), the switching cycle is made longer than the predetermined value (S). It is possible to securely apply a current to a motor and it is possible to prevent a dead zone from being generated, by elongating the switching cycle even in a low duty ratio while slow starting an FET and preventing a noise from being generated.