Apparatus and method for controlling an actuator

The invention relates to a device for controlling a least one MSM-expansion unit and an expansion reaction force generating restoring means having actuator means, having means for generating and introducing a solenoid flow into the expansion unit in response to an electrical activation signal, in particular an activation current, and the means for generating and placing the solenoid flow upstream electronic control unit which performs control of the activation signal to reach a predetermined position and / or expansion amount of the actuator, wherein the position or of expansion follows in response to the activation signal a a hysteresis form having course that a Expansionsschwellwert for comprising the activation signal which is lower than a maximum value of the activation signal, and wherein after reaching the maximum value, the position or Expansionsma does not fall below a predetermined maximum deviation of the final dimension of the position and expansion measurement, wherein the electronic control unit implements an integration of the control deviation between the predetermined and a current position or of expansion effecting control functionality and the control unit are associated with reset means which are adapted to that a reset of the integration is effected on the Expansionsschwellwert in response to the reaching of the gage and / or associated after the end of an expansion predetermined Zeitinvervalls.