Patent ID: 8788163
Filing Date: 2014-07-22
Classification: F16H

Abstract:
1. A method of operating a vehicle drive-train ( 5 ) which comprises a drive machine ( 2 ) and a transmission device ( 3 ), and during a gearshift in the transmission device ( 3 ) at least one interlocking shifting element (F) is disengaged and at least one frictional shifting element (B) is engaged, the method comprising the steps of: initiating monitoring, at a time (T recognizing that the interlocking shifting element (F) is in a disengaged operating condition, if the monitored transmission input speed or the rotational speed equivalent thereto deviates from a synchronous speed equivalent to a gear ratio (“ adjusting a current drive torque (m_mot) of the drive machine ( adjusting the transmission capacity of the frictional shifting element (B) to be engaged, if a load change takes place in the vehicle drive-train ( operating the frictional shifting element (B) with slip at least while the interlocking shifting element (F) is engaged.