Response method for electromagnetic adjustment device e.g. of motor vehicle combustion engine gas-exchange valve, requires driving electromagnet by sequence of current pulses at current pulse frequency of initial pulse of sequence

摘要

The method for exciting an adjustment device with at least an electromagnet and an armature which can be adjusted from an output position (A) against a spring restoring/resetting force in one direction in a first end-position (Ei) in which it rests against an armature counter-piece of the electromagnet. The electromagnet is driven by a predetermined sequence of several current pulses (13). A pulse frequency of the current pulses is reduced to the starting frequency assigned to the first current pulse (13) of the sequence. The starting frequency is made greater than a natural frequency of an oscillatory system containing the armature and spring restoring/resetting force.