Patent ID: 7493895

Claim:
A system for a metered feeding of volatile fuel components, comprising: an electromagnetic canister-purge valve having a valve seat, a sealing element and a coil, the canister-purge valve being actuatable in proportional pulse-width modulation; at least one detecting device configured to detect a distance between the valve seat and the sealing element; and a control unit configured to adjust a coil current through the coil as a function of the distance, wherein the at least one detecting device includes a ferromagnetic element and at least one electric conductor loop, wherein a magnetic flux through the at least one conductor loop generated by the ferromagnetic element changes as a function of a position change of the sealing element relative to the valve seat; the ferromagnetic element is a plunger attached to the sealing element, the entire plunger being formed of a ferrite; and the control unit is connected within a closed-circuit control circuit and the closed-loop control circuit includes a control algorithm configured to dynamically calibrate at least one of a fully open valve position and a fully closed valve position during a service life of the valve.