Patent ID: 8800535

Claim:
An actuation method for a piezoactuator in an injector which is mounted on a cylinder head and has an injection valve, comprising the steps: triggering of an injection by applying an injection charge current pulse to the piezoactuator in order to open the injection valve and start an injection, and applying an injection discharge current pulse to the piezoactuator in order to close the injection valve and end the injection; wherein the injection charge current pulse and the injection discharge current pulse each bring about a change in length of the piezoactuator, which changes in length excite an oscillation system, comprising the injector and the cylinder head, to oscillate; repetition of the steps for triggering an injection after an idle time interval in which no injection takes place; applying a damping charge current pulse to the piezoactuator at a time t 1 , and a damping discharge current pulse at a time t 2 during the idle time interval, wherein the changes in length of the piezoactuator which are generated by the damping charge current pulse and the damping discharge current pulse are too small to activate the injection valve and to trigger an injection, and wherein the times t 1 and t 2 are selected such that excitation of the oscillation system by the damping charge current pulse and the damping discharge current pulse takes place in anti-phase with respect to the oscillation which is excited by the injection charge current pulse and the injection discharge current pulse.