| 摘要 |
The invention relates to a device ( 101 ) for varying the control times of gas exchange valves of an internal combustion engine, with a hydraulic actuation device ( 102 ) and with a control valve ( 103 ). The device ( 101 ) according to the invention is provided with mid-position locking of a hydraulic actuation device ( 102 ). Furthermore, the device ( 101 ) according to the invention ensures that, in the event of the failure of an actuation unit ( 112 ) which regulates the control valve ( 103 ), the hydraulic actuation device ( 102 ) is locked in the mid-position and the lock is maintained until the actuation unit ( 112 ) is repaired. Furthermore, the device ( 101 ) according to the invention makes it possible to start the internal combustion engine in a position locked in a mid-position, without a movable element ( 105 ) of the hydraulic actuation device ( 102 ) butting against a side wall of a pressure space ( 104 ) when the internal combustion engine is started. Methods are proposed to bring the actuation device ( 102 ) into a locked mid-position, and to hold it there, for the restarting of the internal combustion engine.
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