Abstract: The invention relates to an arrangement at an internal combustion engine, comprising an auxiliary unit and a transmission, the auxiliary unit being adapted to be driven by a crankshaft of the engine via the transmission, characterized in that it comprises a first electrical machine, in that the transmission comprises a planetary gear set, comprising three gear parts in the form of a sun wheel, an annulus wheel, and a planet carrier, and in that the three gear parts are connected respectively to the auxiliary unit, the first electrical machine and the crankshaft.