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:
Dec. 09, 2008
Filed:
Nov. 09, 2004
Keisuke Maruo, Shizuoka, JP;
Tomoaki Kishi, Shizuoka, JP;
Takeshi Matsuda, Shizuoka, JP;
Masato Yokoi, Shizuoka, JP;
Naoya Yamaguchi, Shizuoka, JP;
Keisuke Maruo, Shizuoka, JP;
Tomoaki Kishi, Shizuoka, JP;
Takeshi Matsuda, Shizuoka, JP;
Masato Yokoi, Shizuoka, JP;
Naoya Yamaguchi, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-Ken, JP;
Abstract
An electronic throttle valve control system prevents rapid rotation of a throttle valve reliably when the control system has a failure. A throttle valve controls the amount of intake air to an internal combustion engine, an electric motor drives the throttle valve, and a rotational speed reduction mechanism reduces the rotation of the electric motor to control the rotation of the throttle valve. An urging mechanism urges the throttle valve in the closing direction. An attenuation mechanism attenuates the speed at which the throttle valve is rotated in the closing direction by the urging mechanism when the control system has a failure. The attenuation mechanism is the electric motor in a regenerative mode or an air damper.