Patent ID: 9551309
Date: 2017-01-24
CPC Classifications: F02D,F02M

Claim:
1. A method for operating a fluid injector having a longitudinal axis and a valve body, a valve needle received in the valve body and axially moveable between a closing position that prevents a fluid injection and further positions that permit the fluid injection, an armature mechanically coupled to the valve needle for displacing the valve needle away from the closing position, and a solenoid assembly having at least a first and second coil and being operable to magnetically actuate the armature via an electrical signal, the method comprising: applying the electrical signal to the first coil to generate a primary magnetic field to move the armature to thereby displace the valve needle away from the closing position, evaluating a voltage across terminals of the first coil, and controlling the second coil with a further electrical signal to saturate a magnetic field in a portion of the valve body located between the armature and the solenoid assembly during evaluating the voltage.