Patent ID: 6076490
Filing Date: 2000-06-20
Classification: F01L

Abstract:
A combination of a cylinder valve of an internal-combustion engine with an electromagnetic assembly for operating said valve; said assembly comprising(a) an electromagnetic actuator including(1) first and second electromagnets supported in a spaced relationship with respect to one another;(2) an armature movable between said first and second electromagnets; and(3) coupling means for operatively connecting said armature with said valve for moving said valve between open and closed positions by said armature;(b) a first control device for energizing said electromagnets to cause a motion of said valve by electromagnetic forces generated by said first and second electromagnets;(c) first and second pressurizable resetting gas springs operatively coupled to said armature to oppose motions thereof caused by said electromagnetic forces generated by said first and second electromagnets, respectively;(d) a pressure supply means for supplying pressure to said first and second resetting gas springs;(e) a second control device for controlling the pressure supplied to said first and second resetting gas springs; and(f) a pressure sensor disposed in at least one of said first and second resetting gas springs and connected to said first control device for detecting pressures, representing positions of said armature, in said one resetting gas spring.