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:
May. 05, 1998
Filed:
Aug. 12, 1996
Hiroshi Ninomiya, Hiroshima, JP;
Tetsushi Hosokai, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An engine control system computes an average value for an air-to-fuel feedback control based on which the amount of fuel vapors trapped in a canister, a purge air flow rate on the basis of a pressure difference between before and after a canister purge valve and a duty ratio at which the canister purge valve is activated, the amount of purged fuel vapors on the basis of the estimated trapped fuel vapor amount and purge air flow rate based on which the amount of fuel vapors entering into the combustion chamber. During execution of a canister purge, the purged gas flow rate is gradually varied toward a target rate so as to prevent the air-to-fuel feedback control from encountering disturbances.