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:
Sep. 29, 2009
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 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 control section controls the electric motor. The throttle valve has an urging mechanism for urging the throttle valve in the closing direction. The control section shifts the electric motor to a regenerative mode when the control system has a failure to control the speed at which the throttle valve is rotated in the closing direction by the urging force of the urging mechanism. The throttle valve is therefore rotated slowly in the closing direction by the urging force of the urging mechanism and then held in a predetermined opening position.