Patent ID: 7073645

Claim:
A method of controlling a power train for a wheel loader having one pressure-medium actuated brake and one variable ratio transmission connected to an engine via a torque converter, the method of controlling the power train comprising the steps of: actuating at least one of a forward gear and a reverse gear of the transmission by a power shift clutch, and actuating a power-take-off from the transmission; determining a value of total transmission power supplied to the power-take-off; comparing the value of the transmission power supplied to the power-take-off with a predetermined value of power delivered by the transmission to the power-take-off; reducing a pressure of the power shift clutch for one of the forward and reverse gears to a residual level when the value of the transmission power supplied to the power-take-off exceeds the predetermined value of power delivered by the transmission to the power-take-off, and changing the ratio of the transmission when the predetermined value of the power delivered by the transmission to the power take off is exceeded, so that the ratio of the transmission changes in a manner such that an input force to the torque converter of the wheel loaded is maintained.