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. 03, 2005
Filed:
Aug. 19, 2003
Takeshi Tsuyuki, Yokohama, JP;
Takashi Aramaki, Kawasaki, JP;
Masato Kobayashi, Yokohama, JP;
Hiroya Ishii, Yokohama, JP;
Takeshi Tsuyuki, Yokohama, JP;
Takashi Aramaki, Kawasaki, JP;
Masato Kobayashi, Yokohama, JP;
Hiroya Ishii, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama, JP;
Abstract
Fuel vapor in a fuel tank () is purged into an intake passage () of an engine () through a purge vent (). The controller () determines whether a leak is present in a purge vent from the fuel tank () to a purge control valve (). The determination process comprises a pull-down process in which a pressure in the purge vent is reduced using a negative pressure in the intake passage () and a leak-down process of sealing the purge vent at the reduced pressure and monitoring the pressure variation. The controller () calculates an error equivalence amount (DVPII), a pressure component corresponding to sloshing in the fuel tank () during the leak-down process, and determines the presence of a leak in a highly accurate manner based a corrected pressure (DVPA) in which the monitored pressure variation is corrected using the error equivalence amount (DVPII) (S).