| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem in which, when a combustion state is dispersed between cylinders and between combustion cycles due to individual difference or aging deterioration of an engine or component parts, or the like, an EGR quantity most suitable for each cylinder cannot be supplied to improve the fuel economy. <P>SOLUTION: An exhaust-side variable valve timing mechanism provided on an exhaust camshaft controls the opening and closing time or/and lift amount of an exhaust valve for each cylinder to control, for each cylinder, EGR quantity to be supplied into the cylinder during an intake stroke. Each cylinder includes a detection device for detecting a combustion state by an ion current generated in an ignition plug provided in the cylinder or/and a pressure within the cylinder. The detection device detects the combustion state for each combustion cycle of each cylinder, and the exhaust-side variable valve timing mechanism performs correction of EGR quantity so as to improve or maintain the combustion state of each cylinder in the subsequent combustion cycle. Further, the exhaust-side variable valve timing mechanism is composed of an electromagnetic clutch or electric motor. <P>COPYRIGHT: (C)2013,JPO&INPIT |
