Method for the operation of a transmission device of a vehicle drive train

A method of operating a transmission device (1) of a vehicle drive train with at least one drive machine such that the transmission device (1) is formed with at least one interlocking shift element (A, F) and with a plurality of frictional shift elements (B, C, D, E) in order to obtain various gear ratios and during an engaging process of the at least one interlocking shift element (A, F), starting from a disengaged operating condition, in which shift element halves of the at least one interlocking shift element (A, F) are out of engagement, to the engaged operating condition in which the shift element halves of the at least one interlocking shift element (A, F) are engaged with one another in a rotationally fixed manner, and in an event of an intermediate operating condition of the at least one interlocking shift element (A, F) in which interlock between the shift element halves is prevented, a rotational speed difference is produced at least temporarily between the shift element halves, at which the interlock, in an area of the at least one interlocking shift element (A, F), is engagable, and to produce the rotational speed difference between the shift element halves of the at least one interlocking shift element (A, F), a transmission capacity of at least a first frictional shift element (E) is increased, the method comprising the steps of:

• reducing the transmission capacity of the first frictional shift element (E) to approximately zero after the at least one interlocking shift element (A, F) is engaged such that torque is no longer transmitted by the first frictional shift element (E);
• and
• engaging a further shift element (F) in a force flow of the transmission device (1) once the transmission capacity of the first frictional shift element has been reduced.