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:
Jan. 30, 2007
Filed:
Mar. 22, 2005
Daisuke Takahashi, Tokyo, JP;
Masaaki Aihara, Tokyo, JP;
Yasushi Nakoji, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a diagnostic apparatus for an evaporative emission control system which can accurately execute leak diagnosis under a stable condition. An ECU clocks a time tuntil the internal pressure value Pof the evaporative emission control system sealed at the negative pressure reaches the target internal pressure value P, sets the pressure change measuring time tbased on the clocking time t, and measures the pressure change amount Pwhich varies after the internal pressure value Pof the evaporative emission control system reaches the target internal pressure value Pfor a pressure change measuring time t. Then, the ECU sets the determination value Pbased at least on the spatial capacity of the evaporative emission control system, and determines whether the evaporative emission control system is normal or abnormal based on the pressure change amount P.