Method for shift control of an automated group gear

A method of shift control of an automated group gearbox, the group gearbox having at least a multi-step main transmission (HG) and at least a two-step range group (GP) which is positioned, in a flow of drive, downstream from the multi-step main transmission, and the two-step range group (GP) is connected with the multi-step main transmission via a main shaft (5), an input shaft (4) of the main transmission (HG) is either drive connected of drivingly connectable with a drive device (1), the main transmission (HG) and the range group (GP) have synchronization devices (SP1, SP2, SP3, SP4) with shift clutches, the synchronization devices (SP1, SP2, SP3) of the main transmission (HG) each have two shift positions for respective gear ratio steps and a shift position for a neutral position, at least the one synchronization device (SP4) of the range group (GP) exclusively having two shift positions for respective gear ratios steps and in which during a range shifting, in each of the main transmission (HG) and in the range group (GP), a change takes place between two gear ratios steps, the method comprising the steps of:

• in a range shifting, during the synchronization of the range group (GP), synchronizing the input shaft (4) of the main transmission (HG), which was previously shifted into neutral, to a target rotational speed (n_Ziel) by controlling at least one external synchronization aid (1, 3) having an effect at the input shaft (4);
• and
• after reaching the target rotational speed, either after the synchronization and shifting of the gear ratio step of the range group (GP) or independently from the current synchronization condition of the range group (GP), shifting a new gear ratio step in the main transmission (HG).