Method for controlling a motor vehicle operated in all-wheel drive at times

A motor vehicle with a control unit, the motor vehicle comprising:

• a drive unit, a primary drive axle permanently driven by the drive unit, a secondary drive axle, a torque transmission train for transmitting torque from the drive unit to the secondary drive axle, and a disconnect clutch for coupling the second drive axle to the drive unit and for decoupling the second drive axle from the drive unit, wherein the control unit can actuate the disconnect clutch via a first actuating unit, wherein the control unit is configured to determine an all-wheel requirement for the motor vehicle from input signals;
• and if there is a predetermined all-wheel requirement, prepare an all-wheel operation, wherein the disconnect clutch is not closed, wherein determining the all-wheel requirement includes determining a probability of an all-wheel requirement in at least three categories, namely “low,” “medium” and “high”, and the predetermined all-wheel requirement corresponds to the “middle” category, and wherein, in the “low” category, the disconnect clutch is open or remains open.

A method for controlling a motor vehicle operated in all-wheel drive at times, with a control unit, wherein the motor vehicle comprises a drive unit, a primary drive axle permanently driven by the drive unit, a secondary drive axle, a torque transmission train for transmitting torque from the primary drive axle to the secondary drive axle, and a disconnect clutch moveable between a closed position coupling the primary drive axle and the torque transmission train and an open position uncoupling the primary drive axle and the torque transmission train, wherein the control unit is configured to move the disconnect clutch between the closed and open positions via a first actuating unit, the method comprising:

• determining an all-wheel requirement for the motor vehicle from input signals, wherein determining the all-wheel requirement includes determining one of a plurality of probability categories of the all-wheel requirement;
• and
• maintaining the disconnect clutch in the open position with the first actuating unit or moving the disconnect clutch to the open position with the first actuating unit and preparing an all-wheel operation in response to a determination that the probability category is a predetermined one of the plurality of probability categories.