Patent ID: 7288040

Claim:
A method for the control of a drive train ( 1 ) of a vehicle equipped with a motor ( 2 ), a multi-group transmission ( 4 ), an output means, and a control apparatus, the multi-group transmission ( 4 ) comprising at least one automatic transmission ( 8 ) and a subsequently connected range group ( 9 ), and whereby, upon a change of ratio in the range group ( 9 ) the drive train ( 1 ) is relieved of load by means of a change of a torque (m mot ) of the motor 2 ; closing a closable shifting element ( 24 , 25 ) of the range group; synchronizing and opening an openable shifting element ( 24 , 25 ) of the range group ( 9 ); changing a ratio of the automatic transmission ( 8 ) in such a manner, that a change in ratio of the multi-group transmission ( 4 ) is less than that of an unassisted change of ratio of the range group ( 9 );and adjusting a speed of rotation (n mot ) of the motor ( 2 ) by changing a power transfer capability of at least one shifting element of the automatic transmission ( 8 ) to a connective speed of rotation (n mot-a ) equivalent to a synchronized speed at the ratio of the multi-group transmission ( 4 ) at which the closable shifting element ( 24 , 25 ) of the range group ( 9 ) is synchronized.