| 摘要 |
PROBLEM TO BE SOLVED: To suppress a variation in the rotation of an engine due to a variation in the leaked air amount from an intake throttle valve for each cylinder of a system having the intake throttle valve in the intake manifold of each cylinder of the engine. SOLUTION: An EGR increasing control for increasing an EGR amount during the low-load operation of the engine is performed. During the EGR increasing control, a varied rotation amountΔNe (#1) toΔNe (#4) in the rotational speed decreasing direction of each cylinder relative to the averaged rotational speed Ne (av) of all cylinders are obtained. The cylinder corresponding to the maximum varied rotation amount (max) among these cylinders is determined to be a cylinder with large leaked air amount (a cylinder from which a large air amount leaks). The opening of the intake throttle valve is corrected according to the leaked air amount from the intake throttle valve of the cylinder with large leaked air amount by correcting the opening of the intake throttle valve according to the maximum rotation varied amountΔNe (max) during the period corresponding to the suction stroke of the cylinder with large leaked air amount. These treatments are repeatedly performed to suppress the variation in the rotation of the engine by correcting a variation in the intake air amount due to the dispersion of the leaked air amount from the intake throttle valve for each cylinder. COPYRIGHT: (C)2008,JPO&INPIT
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