Torque determination in auxiliary consumers

A drive-train arrangement comprising:

• an engine for supplying branched first and second rotational outputs;
• the first rotational output and first torque forming a rotational input to a gearbox for driving wheels of a vehicle;
• the second rotational output and second torque forming a separate rotational input to an auxiliary consumer, and the rotational input to the auxiliary consumer comprising a belt;
• and
• a gearbox control unit coupled to the gearbox, and the gearbox control unit being configured so that respective rotational speeds of the engine are mapped to a respective second torque applied by the engine to the auxiliary consumer, and the gearbox control unit, during activation of the auxiliary consumer, determining the first torque being applied by the gearbox from the rotational speed of the engine and the mapped respective second torque applied by the engine to the auxiliary consumer and adapting clutch pressures of clutches of the gearbox.