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:
Jun. 14, 2016
Filed:
Dec. 16, 2014
Nsk Ltd., Shinagawa-ku, Tokyo, JP;
Mikihiko Tsunoda, Gunma, JP;
Tamotsu Oumi, Gunma, JP;
NSK Ltd., Tokyo, JP;
Abstract
There is provided an electric power steering device capable of detecting steering torque with high accuracy without use of a torque sensor, and capable of performing appropriate steering assistance control. An alternative torque correction value (Tc) is operated by comparing alternative torque (T) operated based on an angle signal at normal time of the torque sensor () with a torque detection value (Ti) detected by the torque sensor (), and is then stored. Then, at normal time of the torque sensor (), the steering assistance control is performed based on the torque detection value (Ti) detected by the torque sensor (), whereas when an abnormality happens in the torque sensor (), the steering assistance control is performed based on corrected alternative torque (T) obtained by correcting the alternative torque (T) by the alternative torque correction value (Tc).