Patent ID: 8394000

Claim:
A method of operating a vehicle drivetrain ( 1 ) having a drive motor ( 9 ), a transmission ( 10 ) and a drive output ( 2 ), and when shifting a gear in the transmission ( 10 ) from an actually engaged gear to a target gear, the gear shift being carried out with assistance of both a frictional shift element and an interlock-type shift element in a flow of force in the vehicle drivetrain ( 1 ), the method of completing the gear shift from the actually engaged gear to the target gear comprising the steps of: engaging only one of the interlock-type shift element and the frictional shift element in the flow of force in the vehicle drivetrain while disengaging only the other of the frictional shift element and the interlock-type shift element from the flow of force in the vehicle drivetrain; monitoring an actual speed during the gear shift, the actual speed being at least approximately equivalent to a transmission input speed (n_t); adjusting the actual speed (n_t_ist 1 , n_t_ist 2 ), during the gear shift, to a nominal speed (n_t_soll) by at least one of: manipulating an actuation pressure (p_RS) of the frictional shift element associated with the gear shift, and manipulating a torque (m_mot) of the drive motor ( 9 ); and adjusting the actual speed (n_t_ist, n_t_ist 2 ) to the nominal speed (n_t_soll) from a point in time (T 2 ) at which the actual speed (n_t_ist 1 , n_t_ist 2 ) is different from a synchronous speed (n_t_sync(i_ziel)) of the target gear such that the gear shift, from the actually engaged gear to the target gear, is completed as soon as both the interlocking shift element is one of completely engaged and disengaged substantially without any load and the frictional shift element is one of completely disengaged and engaged.