Patent ID: 8880311

Claim:
A method for controlling disengagement of an automated vehicle master clutch arranged in a vehicle drivetrain between a vehicle propulsion unit and a step geared transmission, the method comprising the steps of: determining a first output torque of the propulsion unit prior to initiation of a master clutch disengagement procedure, and where the first output torque is positive or negative; computing, via a control unit, a second output torque of the propulsion unit in dependence of at least the first output torque, and where the second output torque is closer to zero torque than the first output torque; initiating the master clutch disengagement procedure by initiating an oscillation in drive shafts of the drivetrain by abruptly altering output torque of the propulsion unit from the first output torque to the second output torque; and disengaging the master clutch when the oscillation has reached a first oscillation turning point.