Device and method for controlling a fuel injection valve

An actuation device for actuating an injector for injecting fuel into the combustion chamber of an internal combustion engine, the actuation device comprising:

• an output stage generating electric excitation of an electric drive of the injector, the excitation transmitted to the electric drive via an actuation line;
• a measuring unit sensing a feedback signal generated by the electric drive in response to the electric excitation and conducted to the measuring unit via the actuation line;
• and
• a control and evaluation unit coupled to the output stage and the measuring unit;
• wherein the control and evaluation unit causes the output stage to generate a predetermined electrical test pulse;
• the measuring unit senses an electrical response pulse generated at least by the actuation line in response to the test pulse;
• the measuring unit transfers at least one identified characteristic feature of the measured response pulse to the control and evaluation unit;
• wherein the control and evaluation unit evaluates the transferred characteristic feature of the response pulse and acquires therefrom at least one characteristic information item about a measuring channel which comprises at least the measuring unit and the actuation line;
• wherein the injector is in a static operating state in which an injector needle of the injector is in a stationary position during application of the test pulse;
• and
• the control and evaluation unit uses the at least one characteristic information item to adjust future actuation signals to the injector.