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. 21, 2006
Filed:
Dec. 10, 2002
Masahide Iwazawa, Aichi-ken, JP;
Kiyotaka Iwata, Handa, JP;
Akira Ito, Kariya, JP;
Yasushi Yamada, Kariya, JP;
Masahide Iwazawa, Aichi-ken, JP;
Kiyotaka Iwata, Handa, JP;
Akira Ito, Kariya, JP;
Yasushi Yamada, Kariya, JP;
Toyoda Koki Kabushiki Kaisha, Kariya, JP;
Abstract
A controller controls an electric motor to provide assist power corresponding to steering operation for an electric power steering apparatus. The controller comprises a detecting device, a filtering device, a judging device and a determining device. The detecting device detects present voltage of a power source for the electric motor. The filtering device filters the present voltage based on a small time-constant when the voltage of the power source increases and based on a large time-constant when the voltage of the power source decreases. The judging device judges whether the filtered voltage is lower than a predetermined threshold. And, the determining device determines being abnormality of the power source when it is judged that the filtered voltage is lower than the threshold.