Patent ID: 8016717

Claim:
A method for controlling a drive train of a vehicle, comprising an internal combustion engine (VM), two electrical machines, wherein at least one of the two electrical machines (P 1 , P 2 ) can be operated at least as a generator, a stepped automated gear shift transmission (G) with a transmission input (E) and at least one control device (St) for controlling the internal combustion engine (VM), the two electrical machines (P 1 , P 2 ) and the stepped automated gear shift transmission (G), said method comprising the steps of: keeping a braking torque on at least one driven wheel (R) approximately constant by one of the two electrical machines before, during and after a gear-shifting operation to a gear with a higher transmission ratio i during an energy recuperation mode and reducing a recuperation torque by an amount of torque which is required for an acceleration of the internal combustion engine (VM) to a speed where an operative connection is established between the internal combustion engine (VM) and the transmission input (E) during the gear-shifting operation when the recuperation torque is greater than, or equal to, the torque which is required for the acceleration of the internal combustion engine (VM), and providing a drive torque, by the other of the two electrical machines (P 1 , P 2 ), whose magnitude corresponds to the difference between the recuperation torque and the torque required for the acceleration of the internal combustion engine (VM) when the recuperation torque is less than the torque required for the acceleration of the internal combustion engine (VM) so as to efficiently compensate for the torque which is required for the acceleration of the internal combustion engine (VM) to the speed where the operative connection is established between the internal combustion engine (VM) and the transmission input (E) during the gear-shifting operation.