| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a temperature rising effect of an in-cylinder combustion chamber by an internal EGR. <P>SOLUTION: When the internal EGR is performed by controlling the opening/closing timing of an intake valve and an exhaust valve in an internal combustion engine provided with a variable valve timing mechanism, the exhaust valve is closed in a low and middle load region on and after the exhaust top dead center, then the intake valve is opened after a required crank angle is passed. An overlapped period when both the intake valve and the exhaust valve are opened is not provided, consequently a part of the exhaust gas in the cylinder is prevented from flowing out to an intake air passage side, and being cooled and refilled in the cylinder, and the temperature drop in the in-cylinder combustion chamber is effectively avoided. <P>COPYRIGHT: (C)2013,JPO&INPIT |
