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:
Nov. 12, 2013
Filed:
Jan. 14, 2013
Hitachi Automotive Systems Steering, Ltd., Saitama, JP;
Masaki Kodato, Sagamihara, JP;
Kazuya Yamano, Yamato, JP;
Yoshitaka Sugiyama, Machida, JP;
Atsushi Yoshitake, Ebina, JP;
Hitachi Automotive Systems Steering, Ltd., Saitama, JP;
Abstract
Electric power steering system has steering mechanism; input and output shaft side rotation angle sensors detecting rotation angles of input and output shafts; operation circuit calculating command current for an electric motor; rotation direction judging circuit judging whether rotation directions of the input and output shafts are identical; advanced-phase judging circuit judging which phase of input and output shaft side rotation angle signals (S, S) is advanced; normal/reverse input judging circuit judging that (i) when both rotation directions are identical and Sis advanced, input is normal input and (ii) when both rotation directions are identical and Sis advanced, input is reverse input; and command current correcting circuit. The command current correcting circuit corrects the command current so that when the normal input is judged, torque in the same direction as input shaft rotation direction generated by the electric motor is greater than a case of reverse input judgment.