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:
Jul. 14, 2015
Filed:
Jun. 10, 2011
Keiji Maruyama, Hiroshima, JP;
Takayuki Yamaguchi, Hiroshima, JP;
Kentaro Takaki, Hiroshima, JP;
Yuji Matsuo, Hiroshima, JP;
Toshiyuki Kojima, Tokyo, JP;
Hiroyuki Jinno, Hiroshima, JP;
Keiji Maruyama, Hiroshima, JP;
Takayuki Yamaguchi, Hiroshima, JP;
Kentaro Takaki, Hiroshima, JP;
Yuji Matsuo, Hiroshima, JP;
Toshiyuki Kojima, Tokyo, JP;
Hiroyuki Jinno, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An engine includes a variable valve mechanism capable of switching a valve characteristic to a first valve characteristic according to which at least one of an operation of pre-opening an intake valve during an exhaust stroke prior to a valve opening time in an intake stroke and an operation of re-opening an exhaust valve during the intake stroke subsequently to the opening/closing thereof during the exhaust stroke is performed, and to a second valve characteristic according to which neither the pre-opening of the intake valve nor the re-opening of the exhaust valve is performed. In the engine, when the valve characteristic is the first valve characteristic, if the presence of a request for switching to the second valve characteristic resulting from an increase in engine load is detected, a pressure reducing operation for reducing the pressure in an exhaust passage of the engine is performed.