Transmission device having a plurality of shift elements

A transmission device (1) having a plurality of shift elements (A to G) which, in an engaged or a disengaged operating condition, are operatable for achieving nine different gear ratios for the transmission device (1),

• a drive engine (3) being coupleable at least with an input shaft (4) and an electric machine (7) being selectively coupleable, via one of the plurality of shift elements (G), with either a first another shaft (5), a second another shaft (6) or with neither of the first and the second another shafts (5, 6) while an output (8) being operationally connectable with an additional shaft (9),
• the input shaft (4) and at least one of the first and the second another shafts (5, 6) and the additional shaft (9), during at least an approximate traction force uninterrupted gear ratio change starting from a currently engaged gear ratio (“1” to “R”), in a direction toward a target gear ratio (“1” to “R”), being operationally connected via the plurality of shift elements (A to G) which are involved in the gear ratio change such that a rotational speed (n5, n6) of at least one of the first and the second another shafts (5, 6), which are both selectively connectable with the electric machine (7), and when torque is present, an equivalent torque which is present at the additional shaft (9), corresponds to a product based on the gear ratio between the at least one of the first and the second another shafts (5, 6) and the additional shaft (9) and a rotational speed (n9) of the additional shaft (9), or
• when torque is present at the additional shaft (9), equivalent to the torque present at the drive engine (3) and present at the electric machine (7), is a product of the gear ratio between the one of the first and the second another shafts (5, 6) and the additional shaft (9) and the rotational speed (n9) of the additional shaft (9), or
• during the presence of the torque of the drive engine (3) and torque at the electric machine (7) which is equivalent to the torque of the additional shaft (9), is a sum of a product of a rotational speed (n4) of the input shaft (4) and a first variable (V1) which equals a negative quotient of an initiated torque through the electric machine (7) and a torque initiated through the drive engine (3) and corresponds with a product resulting from the rotational speed (n9) of the additional shaft (9) and a second variable (V2), which equals a product resulting from the gear ratio between the input shaft (4) and the additional shaft (9) and the first variable (V1).