Patent ID: 7632211

Claim:
A shift control method of an automatic transmission, the automatic transmission ( 1 ) including at least a two stage range group (BNG) and a multistage main transmission (HG), the automatic transmission ( 1 ) having an input shaft (W 1 ) connectable, via a controllable start up and shifting clutch (K), with a drive motor (M) and being braked by a transmission brake (B), the at least two stage range group (BNG) being located downstream of the main transmission (HG) such that a range change shift is rapidly accomplished by a gear change in the main transmission (HG) and a gear change in the at least two stage range group (BNG) by synchronization of a subsequent gear in each of the main transmission and the at least two stage range group by an outside force-controlled action on the input shaft (W 1 ) of the main transmission (HG), the method comprising the steps of: reducing a motor torque and disengaging the start up and shifting clutch (K); disengaging an engaged gear of the at least two stage range group (BNG); synchronizing the subsequent gear of the at least two stage range group (BNG); disengaging an engaged gear of the main transmission (HG); engaging the subsequent gear of the at least two stage range group (BNG); synchronizing the subsequent gear of the main transmission (HG); engaging the subsequent gear of the main transmission (HG); and engaging the start up and shifting clutch (K) and increasing the motor torque.