Control device and method for operating a dual-clutch transmission of a motor vehicle

A method for operating a dual-clutch transmission of a motor vehicle, comprising:

• operating a first clutch that is closed or engaged by a filled first clutch hydraulic system and, in this way, a first transmission branch is driven, in which a current actual gear is engaged, so that a torque is transmitted from a crank shaft of an engine to a transmission output,
• operating a second clutch that is open or disengaged by a second clutch hydraulic system drained up to a stop setting, and
• in a pre-selection phase for a gear change to a desired gear in a second transmission branch, a rotational motion of the desired gear is synchronized with the transmission output, and the synchronized desired gear is unlocked and engaged, and
• in the second clutch, the second clutch hydraulic system is filled and, in this way, the second clutch is closed up to a touch point starting from which the second clutch transmits a torque from the crank shaft to the second transmission branch, and beyond,
• wherein the filling of the second clutch hydraulic system has begun already during the pre-selection phase and the second clutch hydraulic system is filled in the pre-selection phase at most until reaching a touch point of the second clutch.