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:
May. 06, 2014
Filed:
Aug. 06, 2008
Ikuo Kushiro, Mishima, JP;
Ikuo Kushiro, Mishima, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An object of the present invention is to provide an electric power steering device which reduces the variation of viscous feeling due to the change of steering velocity and presents better steering feeling than conventional power steering devices. A basic assist torque Tab and the like are calculated; filter parameters such as time constant Tare calculated; and a gain Gis calculated. A steering velocity s·θ is calculated and a correction torque Tis calculated as a product of a gain Gand a value obtained by filtering steering velocity s·θ with a filter of second-order lag and first-order advance. Further, a final target assist torque Ta is calculated by summing a basic assist torque Tab and the like and a correction torque T, and a steering assist torque is controlled so that it conforms to the final target assist torque Ta.