Motor vehicle automated gearbox and method for the operation thereof

Abstract

The invention concerns an automated motor vehicle shift transmission () with an input shaft, an output shaft and several selectively engaged gears, the input shaft (W) being connected to a drive motor (M) via an engine clutch (K) that can be engaged and disengaged. To avoid an interruption of the traction force during a shift process, a controllable friction clutch is provided as a change-under-load clutch (K) to connect the input shaft (W) directly to the output shaft (W, W) when necessary. The invention also concerns a method for controlling the gearshifts of an automated motor vehicle shift transmission comprising an input shaft, an output shaft and several selectively engaged gears, and in which the input shaft is connected to a drive motor via an engine clutch that can be engaged or disengaged, such that in a shift process between a loaded gear that is engaged and a target gear to be engaged, the engine clutch remains closed during the gear change. To avoid a traction force interruption it is provided that during a shift process between two gears containing at most one direct step (i>=1), before the loaded gear is disengaged a change-under-load clutch, positioned between the input shaft (W) and the output shaft (W, W), is at least partially closed in order to take over the torque transfer, the loaded gear is then disengaged, the target gear is then synchronized and engaged, and finally the change-under-load clutch (K) is fully opened again.