Fuel injectors
Various embodiments may include a method for adapting the opening behavior of a fuel injector having a solenoid drive, the method comprising: applying a voltage pulse having a predetermined electrical voltage to the solenoid drive; acquiring a time profile of the strength of a current flowing through the solenoid drive; comparing the acquired time profile with a reference profile; and adjusting a value of a mechanical parameter of the fuel injector to reduce a deviation between the acquired time profile of the strength of the current and the reference profile.
1. A method for adapting the opening behavior of a fuel injector having a solenoid drive, the method comprising:
applying a voltage pulse having a predetermined electrical voltage to the solenoid drive;
acquiring a time profile of the strength of a current flowing through the solenoid drive;
comparing the acquired time profile with a reference profile; and
adjusting a value of a mechanical parameter of the fuel injector to reduce a deviation between the acquired time profile of the strength of the current and the reference profile;
wherein comparing the acquired time profile with the reference profile comprises determining a difference between a first time at which a predetermined event occurs in the acquired time profile of the strength of the current, and a second time at which the predetermined event occurs in the reference profile.
2. The method as claimed in claim 1 , wherein the mechanical parameter is selected from the group consisting of: an idle stroke, a needle stroke, and a working stroke.
3. The method as claimed in claim 1 , wherein adjusting the value of the mechanical parameter value depends on the determined difference.
4. The method as claimed in claim 1 , wherein the predetermined event comprises an event selected from the group consisting of: impact of a movable armature onto a nozzle needle and impact of the nozzle needle onto a pole piece.
5. The method as claimed in claim 1 , wherein the predetermined electrical voltage provides a quasi-static input of magnetic field energy.
6. The method as claimed in claim 1 , wherein the predetermined electrical voltage is between 2 V and 16 V.
7. The method as claimed in claim 1 , further comprising:
applying a second voltage pulse having the predetermined electrical voltage to the solenoid drive;
acquiring a second time profile of the strength of the current flowing through the solenoid drive;
comparing the acquired second time profile with the reference profile; and
adjusting the value of the mechanical parameter to reduce a deviation between the acquired second time profile of the strength of the current and the reference profile.
8. A device for adapting the opening behavior of a fuel injector having a solenoid drive, the device comprising:
an application unit for applying a voltage pulse having a predetermined electrical voltage to the solenoid drive;
an acquisition unit for acquiring a time profile of the strength of the current flowing through the solenoid drive;
a comparator unit for comparing the acquired time profile with a reference profile; and
an adjustment unit for adjusting a value of a mechanical parameter of the fuel injector to reduce a deviation between the acquired time profile of the strength of the current and the reference profile;
wherein comparing the acquired time profile with the reference profile comprises determining a difference between a first time at which a predetermined event occurs in the acquired time profile of the strength of the current, and a second time at which the predetermined event occurs in the reference profile.