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:
Jun. 27, 2006
Filed:
Oct. 15, 2002
Masao Kano, Gamagori, JP;
Kenji Nagasaki, Nagoya, JP;
Masao Kano, Gamagori, JP;
Kenji Nagasaki, Nagoya, JP;
DENSO Corporation, Kariya, JP;
Abstract
Pressure leakage in an evaporated fuel control system having a canister for absorbing evaporated fuel in a fuel tank is detected after an engine is stopped and a temperature in the system is stabilized. In the leakage detecting process, communication between the system and an atmospheric pressure is shut-off by closing an electromagnetic valve connected to the canister. The electromagnetic valve is closed by once supplying a full voltage thereto, and the closed-state is maintained by intermittently supplying a voltage in a duty-ratio-controlled manner or by supplying a lower voltage. Thus, power consumption for maintaining the closed-state is reduced.