Method and Device for Determining an Estimated Value of a Measurement Offset of a Phase Current Sensor

A device for determining an estimated value of a measurement offset of a phase current sensor for a phase current of an electric machine, the device comprising:

• a processor configured to determine repeatedly, at each point in time of a sequence of successive points in time:
• a measurement value of a regulation error of a current regulator for adjusting the phase current of the electric machine for the point in time;
• a model value of the regulation error for the point in time by means of a model dependent on at least one stator inductivity of the electric machine on the basis of the estimated value of the measurement offset of the phase current sensor for the point in time;
• and
• the estimated value of the measurement offset of the phase current sensor for a point in time following the point in time by means of a filter unit on the basis of the measurement value of the regulation error and on the basis of the model value of the regulation error.

A method for determining an estimated value of a measurement offset of a phase current sensor for a phase current of an electric machine, wherein the method comprises, repeatedly, at in each case one point in time of a sequence of successive points in time:

• determining a measurement value of a regulation error of a current regulator for adjusting the phase current of the electric machine for the point in time;
• determining, by means of a model dependent on a stator inductivity of the electric machine, a model value of the regulation error for the point in time on the basis of the estimated value of the measurement offset of the phase current sensor for the point in time;
• and
• determining, by means of a filter unit, the estimated value of the measurement offset of the phase current sensor for a point in time following the point in time on the basis of the measurement value of the regulation error for the point in time and on the basis of the model value of the regulation error for the point in time.