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:
Dec. 04, 2001
Filed:
Feb. 03, 2000
Kiyotaka Mamiya, Hiroshima-ken, JP;
Michihiro Imada, Hiroshima-ken, JP;
Takeo Yamauchi, Hiroshima-ken, JP;
Masayuki Tetsuno, Hiroshima-ken, JP;
Mazda Motor Corporation, Hiroshima-ken, JP;
Abstract
Upon refreshing a catalyst (,) in steps SA,to SA,the air-fuel ratio of each combustion chamber (,) of an engine (,) is dither-controlled to periodically vary to the rich and lean sides of a target value (A/F=15 to 16) in steps SA,and SA,In step SA,an injector (,) divisionally injects fuel in two injections within the period from the intake stroke to the compression stroke of each cylinder, thus accomplishing weakly stratified combustion. In step SA,the opening of an EGR valve (,) is controlled to recirculate a large amount of exhaust gas to an intake path (,) so as to achieve around 40% EGR ratio.