Patent ID: 7867138

Claim:
A method of controlling a vehicle transmission, the vehicle transmission having: a power shift gearbox, the power shift gearbox having a power shift input shaft, a power shift output shaft, power shift input gearing and power shift output gearing, and a plurality of power shift clutches to drivingly connect the power shift input gearing and the power shift output gearing, and a master clutch operable to connect the power shift input shaft to a prime mover, the plurality of power shift clutches comprising a first plurality of power shift clutches operable to connect the power shift input gearing to an intermediate gearing and a second plurality of power shift clutches operable to connect the intermediate gearing to the power shift output gearing, wherein a torque path is selected by engaging one of the first plurality of power shift clutches and one of the second plurality of power shift clutches, the method comprising the steps of: disengaging the master clutch, and simultaneously engaging at least two clutches of one of the first plurality of power shift clutches and the second plurality of power shift clutches.