Patent ID: 7247115
Filing Date: 2007-07-24
Classification: F16H,Y10T

Abstract:
1. A method for controlling a drivetrain ( 1 ) in a vehicle, with a drive engine ( 2 ), a multi-range transmission ( 4 ) and a drive output, the multi-range transmission ( 4 ) consisting at least of an automatic transmission ( 8 ) and a downstream range transfer box ( 9 ) that can be shifted by means of shift elements ( 24 , 25 ), when a transmission range of the range transfer box ( 9 ) is changed, a first shift element ( 24 or 25 ) of the range transfer box ( 9 ) that is to be engaged is synchronized by controlling shift elements (A to E) of the automatic transmission ( 8 ), such that the range change in the range transfer box can be, one of, carried out automatically or by generation of a voluntary drivers command at any vehicle speed; wherein a rotation speed (n_mot) of the drive engine is changed toward a connection speed (n_mot_a) of a ratio to be produced in the multi-range transmission, at which the shift element of the range transfer box to be engaged is synchronized; and reducing a transmitting capability of shift elements of the automatic transmission (