An apparatus for controlling gas exchange valves of an internal combustion engine
having hydraulic valve actuators each assigned to one gas exchange valve, with
one adjusting piston acting on the gas exchange valve and two hydraulic work chambers
defined by the adjusting piston the first work chamber acting on the gas exchange
valve in the closing direction being constantly filled with fluid that is under
pressure, and the second work chamber acting on the gas exchange valve in the opening
direction can be filled with and relieved of fluid that is under pressure in alternation
via a first and second electrical control valve. Two valve actuators are each triggered
in alternation by the same first and the same second control valve, and the switchover
of the control valves is performed during the closing state of the two gas exchange
valves actuated by these valve actuators.
