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. 18, 2007
Filed:
Jun. 01, 2005
Takane Hayashi, Yokohama, JP;
Takeshi Tsuyuki, Yokohama, JP;
Hiroya Ishii, Yokohama, JP;
Nissan Motor Co., Ltd., Yokohama-shi, JP;
Abstract
Disclosed is a leak detecting device for a fuel vapor treatment unit that purges a vapor gas generated through evaporation of fuel in a fuel tank () into an intake system () of an engine (). The leak detecting device includes a valve () that can selectively seal the fuel vapor treatment unit; a pressure detecting sensor () that detects a pressure in the fuel vapor treatment unit; and a controller (). The controller () is programmed to: issue a command to close the valve () with a view to sealing the fuel vapor treatment unit during stoppage of the engine (); calculate deviation amounts (P−P) of the detected pressures during stoppage of the engine () after the fuel vapor treatment unit has been sealed; integrate absolute values (|P−P|) of the deviation amounts, and determine, based on an integrated value (s), whether or not there is a leak occurring in the fuel vapor treatment unit.