Electromagnetic actuating device

A method for the operation of a control device for the control current of an electromagnetic actuating device, the electromagnetic actuating device, comprising

• a solenoid coil (3) to which a control current (I) can be applied;
• and
• an armature (4) associated with the solenoid coil (3) which is adapted to carry out movements which are dependent upon a control current (I) flowing through the solenoid coil (3) and a spring arrangement (5, 8) for biasing the armature (4) into opposite directions,
• with a holding position (P0) being defined which is assumed by the armature (4) at a holding current (I0) through the solenoid coil (3);
• with means for varying the current (I) flowing through the solenoid coil (3), being adapted to vary the holding current (I0) to a higher value (I2;
• I2>I0) or to a lower value (I1;
• I1<I0), with the armature (4) not leaving the holding position (P0), and
• both the higher and lower current value (I2, I1) being able to be dimensioned in such a manner that interference influences on the magnetic and spring forces which actuate the armature (4) do not bring the armature (4) from its holding position (P0) into a first or a second actuated position (P1, P2),
• the control device for the control current of the electro-magnetic actuating device
• determining a value related to the position of the armature (4) and supplying it as the controlled variable (x),
• supplying a control current to the solenoid coil (3) as the actuating variable (y), and
• externally specifying a set point as the command variable (w) of the control device for the value which is related to the position of the armature (4),
• wherein the holding current (I0), a higher (I2;
• I2>I0) as well as a lower (I2;
• I2<I0) current value are specified in such a manner that interference influences acting on the magnetic and spring forces which actuate the armature (4) do not bring the armature (4) when it changes from an actuated position (P1, P2) which is different from the holding position (P0) into the holding position (P0) into an actuated position (P1, P2) which is different from the holding position (P0), the method comprising the steps of:
• a) outputting a control current (I0) for the holding position (P0) of the electromagnetic actuating device as the actuating variable (y) if a control deviation (xd) between the command variable (w) and the controlled variable (x) does not exceed the amount of a predetermined value;
• (b) outputting a control current (I1) for a first actuating position (P1) of the electromagnetic actuating device as the actuating variable if the control deviation (xd) between the command variable (w) and the controlled variable (x) is less than the predetermined value;
• and
• c) outputting a control current (I2) for a second actuating position (P2) of the electromagnetic actuating device as the actuating variable if the control deviation (xd) between the command variable (w) and the controlled variable (x) exceeds the predetermined value.