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:
Feb. 23, 2016
Filed:
Jan. 05, 2012
Fumihiro Morishita, Tochigi-ken, JP;
Kyoji Hamamoto, Tochigi-ken, JP;
Hiroaki Horii, Tochigi-ken, JP;
Takuji Wada, Tochigi-ken, JP;
Hiroki Sagami, Tochigi-ken, JP;
Shinji Hironaka, Tochigi-ken, JP;
Fumihiro Morishita, Tochigi-ken, JP;
Kyoji Hamamoto, Tochigi-ken, JP;
Hiroaki Horii, Tochigi-ken, JP;
Takuji Wada, Tochigi-ken, JP;
Hiroki Sagami, Tochigi-ken, JP;
Shinji Hironaka, Tochigi-ken, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
An electric power steering device provides an appropriate power assist from the motor even when torque sensors have failed and the steering torque is no longer detected. If an error is detected in a torque sensor, the motor is driven based on the rotor rotation angle detected by a resolver and assist characteristics. When the absolute value of the rotor turning angle velocity calculated based on the rotor rotation angle falls to or below a prescribed value, a process is started for reducing the current driving the motor, and if the state in which the absolute value of the rotor turning angle velocity has fallen to or below the prescribed value continues over a prescribed length of time, the process for reducing the current is interrupted and, because an assist current was flowing at said time of interruption, an appropriate power assist can be given during a steering retention period.