| 摘要 |
Method and apparatus for providing an internal combustion engine which for each cylinder, with the associated piston, has at least one inlet valve and at least one exhaust valve ( 10 ) for controlling the connection between the combustion chamber in the cylinder and an intake system and an exhaust system, respectively. A rotatable camshaft ( 18 ) with a cam ( 22 ) is designed to interact with a first cam follower ( 17 ) and a second cam follower ( 20 ) in order to switch between two different operating modes. The cam followers are mounted on a pivotal rocker arm ( 13 ), the second cam follower ( 20 ) being hydraulically adjustable between two positions by means of a piston ( 21 ) located in a hydraulic cylinder. The hydraulic cylinder is connected to a hydraulic fluid source via a hydraulic fluid duct and the piston can be moved from one position to the other by the action of a quantity of hydraulic fluid delivered to the hydraulic cylinder.
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