Patent ID: 7367924

Claim:
A method for controlling the switching processes of a powershift gearbox and at least one gear actuator, where said gearbox is coupled to an engine and comprises a new friction clutch and a plurality of gear steps displaying a plurality of gear step clutches and said at least one gear actuator is arranged to actuate the plurality of gear steps, the method comprising the following steps: taking over a moment of the engine by means of the new friction clutch, where the new friction clutch is associated with a new gear step from the plurality of gear steps; applying, by means of the gear actuator, a predetermined pre-stress force to a gear step clutch associated with an old gear step from the plurality of gear steps, where the old gear step is engaged and the predetermined pre-stress force is applied in a time interval up to and including the taking over of the moment of the engine by means of the new friction clutch; disengaging the old gear step when the moment of the engine and a moment of the new friction clutch are in balance; and, reducing slippage in the new friction clutch after disengaging the old gear step, wherein reducing slippage further comprises changing, at a start of the slippage reduction, a second required engine moment according to a stepped function and adapting the second required engine moment to a desired moment for a driver in an extensively linear fashion after the switching process.