| 摘要 |
<p>An apparatus controls valve timing of an internal combustion engine that is provided with helical splines (50, 52) of an actuator (24) for varying a phase difference in rotation and an actuator (22a) for varying a cam profile and lift of an intake cam (27). When the apparatus for controlling valve timing and respective actuators are not driven, a valve timing can be automatically established, which can achieve a cold valve overlap &thetas;ov. Carburetion of fuel can be promoted in the combustion chamber and intake ports by the blow-back of exhaust resulting from the cold valve overlap &thetas;ov. A mixture is made into a sufficient air-fuel ratio without depending on an increase in fuel when cold idling, wherein combustion is stabilized still more than in a case where valve overlap is not increased, cold hesitation can be prevented from occurring, and drivability can be maintained in a comparatively favorable state. <IMAGE></p> |
