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:
Sep. 04, 2007
Filed:
Jul. 15, 2005
Shuji Endo, Gunma, JP;
Yuho Aoki, Gunma, JP;
Kenji Mori, Gunma, JP;
Toru Sakaguchi, Gunma, JP;
Sakae Nejo, Gunma, JP;
Hideaki Okazaki, Gunma, JP;
Lilit Kovudhikulrungsri, Gunma, JP;
Shuji Endo, Gunma, JP;
Yuho Aoki, Gunma, JP;
Kenji Mori, Gunma, JP;
Toru Sakaguchi, Gunma, JP;
Sakae Nejo, Gunma, JP;
Hideaki Okazaki, Gunma, JP;
Lilit Kovudhikulrungsri, Gunma, JP;
NSK, Ltd., Tokyo, JP;
Abstract
The present invention provides an excellent electric power steering apparatus in which torque ripple caused by a quantization error of a current control system generated in case of slow steering state and steering holding state, namely, vibration and noise on a steering wheel can be suppressed. A current controller in which a steady state gain of feedback control is a finite value is used so as to be capable of suppressing the vibration and noise. Further, according to the present invention, a smoothing filter is included in a current control system so that the quantization error is smoothed so that the torque ripple is suppressed.