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:
Oct. 07, 2014
Filed:
Mar. 01, 2011
Kouji Shishime, Hiroshima, JP;
Naoya Matsuo, Higashihiroshima, JP;
Mikinori Ohashi, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
When preignition is detected, and an engine speed is less than a predetermined value (Nex), an air/fuel ratio is enriched (S), and then, when the preignition is detected even after enriching the air/fuel ratio, an effective compression ratio of an engine is reduced (S), whereafter, when the preignition is detected even after reducing the effective compression ratio, a part of injection fuel is injected in a compression stroke (S). On the other hand, when preignition is detected, and an engine speed is equal to or greater than the predetermined value (Nex), the air/fuel ratio is enriched (S), and then, when the preignition is detected even after enriching the air/fuel ratio, a part of the fuel is injected in the compression stroke (S). This makes it possible to effectively suppress the occurrence of preignition while maximally avoiding deterioration in emission performance and lowering in engine power output.