Electromagnetic actuator element position detecting device and method for a movable

The voltage applied to the multi-step shaped coil, a plurality of measurement values ​​is obtained based on a change in the coil current when a voltage is applied at all levels, change in the inductance of the first table with the measured values ​​and the respective associated coil, the second table comparison, the movable member is determined uniquely electromagnetic actuator position, whereby the movable element can be discriminated when the inductance decrease caused by the magnetic saturation and the suction position by an air gap between the movable member and the bottom of the stator the movable member position separated a large drop caused by the inductance.