Variable-speed transmission with electric motor-driven shift drum, and method for controlling such a variable-speed transmission

A torque-converting or speed-converting variable-speed transmission, comprising:

• an input shaft and an output shaft and at least two gear ratios, each of which is assigned at least one changeable gear pair, and
• shifting elements connected to the gear pairs, including cogwheels, and the shifting elements can change these connections with changing processes of changing from one gear ration to another gear ratio,
• wherein the shifting elements are in engagement with a shift drum, which is bringable into defined angular positions and rotatable between these angular positions,
• wherein the shift drum is coupled with an electric-motor direct drive, which is arranged to rotate the shift drum and bring it into the particular defined angular positions in order to change gear ratios,
• wherein the electric-motor direct drive of the shift drum is assigned at least one sensor for the detection of the electric supply currents upon actuations of the shift drum in connection with change operations of gear ratios, and
• wherein the control of the change operations of gear ratios is carried out at least based on a) the detected supply currents of the electric-motor direct drive of the shift drum and b) the rotational energies of the rotating parts in engagement with the particular cogwheels involved in a change of a particular gear ratio, and
• wherein rotational energies for different gear ratios are each weighted differently or are taken from tables or characteristic maps and each is taken into consideration differently during changing gear ratios.