Abstract: A method provides for operating a drive train having several drive assemblies, a transmission and an output A first drive assembly acts on a first transmission shaft of the transmission, and a second drive assembly acts on a second transmission shaft. The transmission includes several shift elements, whereas an output torque depending on a driver's requested torque is provided at the output. For the opening of a shift element the shift element is placed without load. The probability of a gearshift request is determined on the control side by a shifting strategy.

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: A method provides for operating a drive train having several drive assemblies, a transmission and an output A first drive assembly acts on a first transmission shaft of the transmission, and a second drive assembly acts on a second transmission shaft. The transmission includes several shift elements, whereas an output torque depending on a driver's requested torque is provided at the output. For the opening of a shift element the shift element is placed without load. The probability of a gearshift request is determined on the control side by a shifting strategy.

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.

Abstract: A method for operating a hydraulic system of an automatic transmission, in particular in a hybrid drivetrain, in which the hydraulic system comprises a main pump that is powered by an internal combustion engine and/or an electric drive motor, an electric auxiliary pump and a system pressure valve for setting a system pressure, to ensure various operating functions. In addition to the main pump, the electric auxiliary pump also supplies the hydraulic system with a volume flow of an operating medium. The loading of the electric auxiliary pump is determined in an electronic control unit with regard to the value of the system pressure and the loading of the electric auxiliary pump is limited, by the electronic control unit, with regard to the selected operating function.