Impulse start in a hybrid drivetrain

A method for operating a hybrid-drive device of a motor vehicle, wherein the hybrid-drive device comprises:

• an internal-combustion engine, an electric machine, and an impulse-start module, wherein the impulse-start module comprises a first clutch, a second clutch, and a centrifugal mass coupled to the internal-combustion engine solely via the first clutch and to the electric machine solely via the second clutch, the method comprising:
• opening the first clutch;
• establishing a start-up requirement for the internal-combustion engine;
• closing the first clutch, so as to couple the centrifugal mass to the internal-combustion engine, while opening the second clutch to an open position and thereby decoupling the centrifugal mass from the electric machine, when the start-up requirement is a first start-up requirement, and while maintaining the second clutch in a closed position, coupling the centrifugal mass to the electric machine, when the start-up requirement is a second start-up requirement, so as to start the internal-combustion engine in accordance with the start-up requirement;
• selecting a speed of the centrifugal mass such that, during the start of the internal-combustion engine, the speed of the centrifugal mass lies above an idling speed of the internal-combustion engine prior to closing the first clutch;
• and
• shifting the electric machine at least one gear higher after opening the second clutch and prior to closing the first clutch.