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:
Mar. 26, 2013
Filed:
Jun. 30, 2010
Masahisa Yamakawa, Hiroshima, JP;
Takashi Youso, Hiroshima, JP;
Kouhei Iwai, Hiroshima, JP;
Shuji Oba, Hiroshima, JP;
Masahisa Yamakawa, Hiroshima, JP;
Takashi Youso, Hiroshima, JP;
Kouhei Iwai, Hiroshima, JP;
Shuji Oba, Hiroshima, JP;
Mazda Motor Corporation, , JP;
Abstract
In a specified operating area including a low engine-speed and low engine-load area, an excess air ratio λ is set at a specified ratio which is two or greater and three or smaller and an ignition timing θig of a spark plug is set at a timing of MBT to provide the maximum torque as a normal combustion control (S). In case a catalyst temperature Tc is lower than a predetermined first temperature Tin this area, a control of retarding the ignition timing from the MBT timing and/or a control of decreasing the excess air ratio λ to a ration below the above-described ratio are executed (S, S, S). Accordingly, the temperature of the catalyst can be prevented simply and effectively from decreasing excessively, maintaining combustion conditions to provide a properly high thermal efficiency.