Patent ID: 7302922
Filing Date: 2007-12-04
Classification: F01L

Abstract:
1. A device for variable actuation of gas exchange valves of internal combustion engines with a plurality of cylinders, comprising: a camshaft with at least one cam; a housing, said camshaft being mounted in said housing and rotating as a function of engine speed; a connecting link and a first curved link, said connecting link being actuatable by said cam through said first curved link; a driven element for transferring motion to said gas exchange valves and connected to said connecting link; at least one other curved link between said connecting link and said driven element, said other curved link having a first section in which no lifting motion for said gas exchange valves is transferred through said driven element, said curved link having a second section in which lifting motion for said gas exchange valves is transferred through said driven element with the capability of displacing at least one transmission element along a displacement path and modifying thereby the course of a lifting curve of said gas exchange valves; a plurality of displacement units, gas exchange valves of one cylinder in one of said displacement units being displaced together and independently of displacement units of other cylinders; separate actuators for each displacement unit for operating said displacement unit; rotational angle sensors for capturing rotational angle signals of a crankshaft and camshaft or another shaft running at half the crankshaft speed for deriving a common resting phase of all valves of a cylinder to be adjusted in common; and a control unit for displacing each displacement unit during said common resting phase.