Method and device for determining a reference - current for a fuel injector for the determination of the point in time of a predetermined opening condition of the fuel injector

摘要

A method for determining a reference - current for a fuel injector for an internal combustion engine of a motor vehicle, which fuel injector has a coil-magnet drive, the method comprisingActivation of the magnet coils drive of the fuel injector with a first voltage pulse, so that the fuel injector is opened,Activation of the magnet coils drive of the fuel injector with a holding voltage, in order to hold open the fuel injector,Switching off of the holding voltage,Waiting for that, for a predetermined period of time substantially no current flows through the coil-magnet drive, wherein the predetermined time period is so short that the fuel injector remains open,Activation of the magnet coils drive of the fuel injector with a second voltage pulse, andDetecting the time characteristic of the current intensity of a current, which during the step of energizing with the second voltage pulse flows through the coil-magnet drive, wherein the detected time course of the reference current - forms.