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:
Apr. 10, 2012
Filed:
Jul. 16, 2009
Toshiaki Nishimoto, Hiroshima, JP;
Tomomi Watanabe, Hiroshima, JP;
Yoshiteru Nakayama, Hiroshima, JP;
Tatsuya Fujikawa, Hiroshima, JP;
Masahisa Yamakawa, Hiroshima, JP;
Toshiaki Nishimoto, Hiroshima, JP;
Tomomi Watanabe, Hiroshima, JP;
Yoshiteru Nakayama, Hiroshima, JP;
Tatsuya Fujikawa, Hiroshima, JP;
Masahisa Yamakawa, Hiroshima, JP;
Mazda Motor Corporation, , JP;
Abstract
Disclosed is a direct-injection spark-ignition engine designed to promote catalyst activation during cold engine operation. A fuel injection timing for a fuel injection period in an compression stroke (second fuel injection period F2) is set to allow a first fuel spray Ga injected from a first spray holeto enter a cavityin a piston crown surface, and allow a second fuel spray Gb to impinge against a region of the piston crown surfacelocated closer to an injector than the cavity, so as to cause the second fuel spray Gb having a lowered penetration force due to the impingement to be pulled toward the cavityby a negative pressure generated in the cavityas a result of passing of the first fuel spray Ga therethrough. The direct-injection spark-ignition engine can maximally hold an injected fuel spray around a spark plug to reliably stabilize a combustion state in a combustion mode for promoting catalyst activation during cold engine operation, while enhancing combustion efficiency in a homogenous combustion mode during normal engine operation.