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. 02, 2008
Filed:
Feb. 12, 2007
Toshiki Annoura, Nagoya, JP;
Toshiki Annoura, Nagoya, JP;
Denso Corporation, , JP;
Abstract
A fuel vapor treatment apparatus includes a first determiner that determines a concentration of purged fuel based on an amount of deviation from a target air-fuel ratio of an air-fuel ratio detected by a sensor provided in an exhaust pipe. A second determiner that determines the concentration of purged fuel in a state in which a purge control valve is closed. Air-fuel ratio controller controls a fuel injection quantity to bring an air-fuel ratio to the target air-fuel ratio on the basis of the concentration of the purged fuel. The air-fuel ratio controller uses the concentration of fuel determined by the second determiner when purge is started or restarted, and uses the concentration of fuel determined by the first determiner thereafter in the course of performing purge. It is possible to increase a purge ratio when purge is started or restarted.