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:
Aug. 23, 2005
Filed:
Jun. 03, 2004
Akinori Osanai, Susono, JP;
Akinori Osanai, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An evaporative emission control system includes a canister for collecting fuel vapor from a fuel tank, and a purge control valve disposed between the canister and the intake passage of the engine. A controller of the system determines a failure of the purge control valve, executes a purging process by opening the purge control valve, executes a learning process for learning the fuel concentration of the purge gas, and executes a correcting process for correcting the amount of fuel injected into the engine based on the learned value of the fuel concentration. When the purge control valve is normal and conditions for execution of purge control are satisfied, the controller requests execution of the purging process, learning process and the correcting process. When an open failure occurs in the purge control valve, the controller always requests execution of the learning process and the correcting process.