For each clutching and declutching action, the sequential M-gearbox control unit requires the exact position of the clutch. The coupling is operated via the clutch operating cylinder. The displacement is detected without contact via a PLCD sensor (PLCD = Permanent Linear Contactless Displacement).
The PLCD sensor is integrated on the clutch operating cylinder and it passes on the clutch travel.
A round solenoid is attached to the moving piston. It is shifted with the cylinder piston parallel to a coil core seated, firmly cast, in a separate casing. The change in the induced stress is a measurement of the position of the clutch.