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:
Mar. 24, 2009
Filed:
Jun. 13, 2007
Yasuo Shimizu, Shimotsuke, JP;
Yoshito Nakamura, Kawachi-gun, JP;
Shunichiro Sueyoshi, Shioya-gun, JP;
Atsuhiko Yoneda, Utsunomiya, JP;
Yasuo Shimizu, Shimotsuke, JP;
Yoshito Nakamura, Kawachi-gun, JP;
Shunichiro Sueyoshi, Shioya-gun, JP;
Atsuhiko Yoneda, Utsunomiya, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
A magnetostrictive torque sensor includes first and second magnetostrictive films which are provided at a shaft and have different magnetic anisotropies; a first measurement coil and a second measurement coil which face the first magnetostrictive film; and a third measurement coil and a fourth measurement coil which face the second magnetostrictive film. A torque applied to the shaft is measured based on a variation in magnetic characteristics of the first and the second magnetostrictive films; and a failure of the magnetostrictive torque sensor is detected based on a first difference between output values from the first and the second measurement coils and a second difference between output values from the third and the fourth measurement coils. An electric steering system includes the magnetostrictive torque sensor for measuring a steering torque of the system; and an electric motor driven based on the measured magnetostrictive torque for steering the vehicle.