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:
Nov. 26, 2013
Filed:
Jun. 15, 2011
Takeshi Yokoo, Hiroshima, JP;
Daisuke Shimo, Hiroshima, JP;
Yoshie Kakuda, Hiroshima, JP;
Kim Sangkyu, Higashihiroshima, JP;
Kyotaro Nishimoto, Hiroshima, JP;
Takeshi Yokoo, Hiroshima, JP;
Daisuke Shimo, Hiroshima, JP;
Yoshie Kakuda, Hiroshima, JP;
Kim Sangkyu, Higashihiroshima, JP;
Kyotaro Nishimoto, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A diesel engine body is provided with a geometric compression ratio ε within a range of 12:1 to 15:1. The engine body has an intake valve for opening and closing an intake passage of a cylinder, an exhaust valve for opening and closing an exhaust passage of the cylinder, and an exhaust gas re-circulation passage communicating with the intake and exhaust passages and for partially re-circulating exhaust to the intake passage. During low engine load and rotation speed conditions, the exhaust valve is opened during an intake stroke, and the intake passage is choked. The exhaust valve is closed before the intake valve in the later stage of the intake stroke. An opening area Sof the exhaust valve is set so that a ratio of Sto an opening area Sof the intake valve meets a relation of:0.01×(15−ε)+0.02≦≦0.17.