Description of the IVC-System

As shown in the figure above the IVC actuator relies on the spring oscillator principle like the linear design (referred to as classical EMVT) where the valves of the combustion engine are accelerated by springs and fixed in their end positions by controlling the current of the coils of the electromagnets.

The valve timing can be realized by appropriate current control. The mechanical losses during the switching movement (friction losses, gas losses) are compensated by stroke work of the electromagnets.

In contrast to the classical EMVT the magnet force is applied to the valve indirectly through the armature which is implemented as a lever. The armature is supported by a torsion bar which is integrated in a revolving tube. The forces of the torsion bar and the valve spring work against each other to provide a balance at the middle stroke position (centered between the upper and lower magnets).