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. 23, 2008
Filed:
May. 22, 2007
Daisuke Shimo, Hiroshima, JP;
Motoshi Kataoka, Hiroshima, JP;
Masahiko Fujimoto, Hiroshima, JP;
Daisuke Fukuda, Hiroshima, JP;
Daisuke Shimo, Hiroshima, JP;
Motoshi Kataoka, Hiroshima, JP;
Masahiko Fujimoto, Hiroshima, JP;
Daisuke Fukuda, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An engine exhaust gas purifier includes: an injection controller allowing a fuel injection valve to inject fuel near the top dead center on each compression stroke; an EGR amount controller for controlling the amount of exhaust gas recirculated into a combustion chamber; an excess air ratio controller for controlling the excess air ratio so that the local equivalence ratio in a late combustion stage is lower than the equivalence ratio at which soot is produced; and an intake air temperature controller for controlling the temperature of intake air after being mixed with exhaust gas. The intake air temperature controller controls the temperature of intake air within a temperature range lower than an upper temperature limit below which a predetermined ignition delay time can be secured and higher than a lower temperature limit above which the production of HC and CO can be avoided.