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:
May. 04, 2004
Filed:
Jan. 15, 2003
Masaya Furushou, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
A fuel vapor treatment apparatus for an internal combustion engine is configured to improve the purge control performance of a purge control valve. The fuel vapor treatment apparatus includes a purge control valve, an operating condition detector, a purge gas flow rate setting component and a control unit. The control unit outputs a duty value and a drive frequency to the purge control valve to duty control the opening and closing of the purge control valve when prescribed operating conditions are met. The control unit sets a high drive frequency used for duty control of the purge control valve during a low flow rate control of the purge gas and to a low drive frequency during a high flow rate control of the purge gas.