Method of Operating a Transmission

Method for operating a transmission (G, G2) with a transmission input shaft (GW1), a transmission output shaft (GW2), a gear set (RS, RS2) with at least two planetary gear sets (P1, P2; P21, P22, P23, P25), and an electric motor (EM) with a rotor (R) and a stator (S), whereas, by means of shift elements (A-F, A2-F2), a plural number of gears is shiftable between the transmission input shaft (GW1) and the transmission output shaft (GW2) under load, whereas, in one engaged gear, at least two of the shift elements (A-F, A2-F2) are locked, whereas, upon a shifting process of the transmission (G, G2) from one original gear to a target gear, in a first step (S1), one of the shift elements (A-F, A2-F2) located in the power flow of the transmission (G, G2) at this point in time is essentially set load-free by means of an electric motor (EM), in a second step (S2), the shift element essentially set load-free in the first step (S1) is opened, in a third step (S3), a rotational speed synchronization between two shafts of the transmission (G, G2) is undertaken by means of the electric motor (EM) and/or by means of a torque at the transmission input shaft (GW1), which are to be connected in the target gear through a shift element, which in the first step was not in the power flow of the transmission (G, G2), and in a fourth step (S4), the shift element between the shafts synchronized in the third step (S3) is locked.