System for controlling clutch

A system for controlling a clutch, comprising:

• a thrust member drivingly coupled with the clutch and movable axially between a first position for disconnecting the clutch and a second position for connecting the clutch;
• a solenoid generating a magnetic flux in response to input of electric power;
• a movable element arranged to receive the magnetic flux and drivingly coupled with the thrust member, the movable element being set into motion by the magnetic flux to drive the thrust member between the first position and the second position;
• an electric circuit configured to add alternating-current power to the electric power and apply the electric power with the alternating-current power to the solenoid;
• and
• a controller electrically connected to the electric circuit and configured to detect a phase difference of an electric current relative to an electric voltage in the alternating-current power added to the electric power and compare the detected phase difference with a reference value to determine whether the thrust member is at the first position or at the second position.