Schaltung und Verfahren zur Bestimmung des Offsetfehlers bei einer offsetfehlerbehafteten Messung des Spulenstroms eines elektromagnetischen Stellgerätes

The invention relates to a circuit and to a method for determining the offset error of the measurement of the coil current of an electromagnetic actuator (1) that is subject to such an offset error. According to the inventive method, the electric current (I) flowing through the coil (14, 16) is measured when the actuator (1) has reached a final position (19, 20) in which the coil (14, 16) is not supplied with electric current. The measuring value obtained is used to determine an offset error. For an actuator (1) that actuates a gas exchange valve (2, 3, 4) the offset error is preferably determined only when the gas exchange valve (2, 3, 4) has reached its final position (19, 20) in which the coil (16, 14) for which the offset error should be determined is not supplied with electric current.