Apparatus for and method of controlling variable valve timing mechanism

摘要

The present invention relates to an apparatus for and a method of controlling a variable valve timing mechanism. The valve timing mechanism changes over between a first cam for which the closing timing IVC of the intake valve is after intake bottom dead center, and a second cam for which the closing timing IVC is closer to intake bottom dead center than the closing timing IVC with the first cam. Here at the time of stopping the internal combustion engine, the valve timing mechanism changes over to the first cam, and the initial intake stroke performs operation at low effective compression ratio. In the second and subsequent intake strokes, the valve timing mechanism changes from the first cam to the second cam.

主权项

1. An apparatus for controlling a variable valve timing mechanism that changes a closing timing of an intake valve of an internal combustion engine, comprising:
a first control unit configured to control the closing timing of the intake valve in an intake stroke of a first cylinder of a plurality of cylinders, which first cylinder goes into the intake stroke first of the plurality of cylinders at a time of startup of the internal combustion engine, so as to be a first closing timing on a retardation side from an intake bottom dead center; and a second control unit configured to change the closing timing of the intake valve to a second closing timing at which the intake valve is closer to the intake bottom dead center than at the first closing timing, from after the time of startup of the internal combustion engine until the closing timing of the intake valve in a second intake stroke for another cylinder of the plurality of cylinders.