Patent ID: 7976431

Claim:
A method for shifting an automated group transmission situated in a drive train of a motor vehicle between a prime mover and an axle drive, the automated group transmission comprising at least one multi-speed main transmission (HG, HG′), a two-speed range change group (GP) rear-mounted on the at least one multi-speed main transmission (HG, HG′), and the main transmission (HG, HG′) being constructed of a countershaft design having at least one countershaft (W VG1 , W VG ) provided with an actuatable transmission brake (Br), an input shaft (W GE ) being connected via an actuatable separating clutch (K) with the prime mover, the main transmission (HG, HG′) and the range change group (GP) being shiftable via unsynchronized dog clutches combined in pairs in a common shift set (S 1 , S 2 , S 1 ′-S 3 ′, SP) having two shift positions and one neutral position (N), wherein during a range change gearshift both in the main transmission (HG, HG′) and in the range change group (GP), a change between two ratio stages occurs, and a range change up-shift comprises the steps of: reducing (SH 1 ) a load of the prime mover; de-activating (SH 2 a ) an actual ratio stage (L) of the range change group (GP=N), fully disengaging (SH 2 b ) the separating clutch (K=0), initiating (SH 3 ) actuation of the prime mover to the target rotational speed of the input shaft (W GE ); synchronizing (SH 4 ) the input shaft (W GE ) to the target rotational speed by actuation of the transmission brake (Br>0); de-activating (SH 5 ) the actual ratio stage of the main transmission (HG=N); activating (SH 6 a ) the target ratio stage of the main transmission (HG), activating (SH 6 b ) the target ratio stage ( 6 ) of the range change group (GP); fully engaging (SH 7 a ) the separating clutch (K=1); and increasing (SH 7 b ) the load of the prime mover.