Abstract: A method is provided for operating a drive train having drive units, one transmission, and one output. A first drive unit acts on a first transmission shaft of the transmission, and a second drive unit acts on a second transmission shaft. The transmission comprises several shift elements, whereas, at the output, an output torque that depends on the torque required by the driver is provided. For the opening of a shift element, the shift element is positioned in a load-free manner. For the load-free positioning of the shift element, target torques are calculated for the first and the second drive unit, by means of which, while maintaining the torque required by the driver at the output, the shift element is positioned in a load-free manner. There is an examination of whether at least one of such target torques violates the torque limit of the respective drive unit.

Abstract: Method for operating a drive train, which features several drive units (1, 2), one transmission (3) and one output (4), whereas a first drive unit (1) acts on a first transmission shaft (6) of the transmission (3), whereas a second drive unit (2) acts on a second transmission shaft (7) of the transmission (3), whereas the transmission (3) comprises several shift elements (9), whereas, at the output (4), an output torque that depends on the torque required by the driver is provided, and whereas, for the opening of a shift element (9) of the transmission (3), the shift element (9) to be opened is positioned in a load-free manner.