Abstract: A method for controlling operation of a parallel transmission comprising two partial transmissions that act upon a common drive shaft and can be coupled to a drive shaft via one respective clutch. The gear ratio of the parallel transmission can be changed from the gear that is engaged in one partial transmission to the gear that is engaged in the other partial transmission without interrupting traction when the parallel transmission functions correctly by opening the clutch of one partial transmission and simultaneously closing the clutch of the other partial transmission. When a malfunction is detected in the actuator of at least one of the clutches, the open clutch can be closed only if at least one of the following conditions is met: the previously closed clutch is open; or, no gear is engaged in the partial transmission allocated to the previously closed clutch.

Abstract: The hybrid drive train has an internal combustion engine connected to a first input shaft via a first clutch and connected to a second input shaft via a second clutch. An electric machine is connected to the second input shaft. The first input shaft is coupled to an output shaft via a first gear, and the second input shaft is coupled to the output shaft via two second gears. In the method for operating the hybrid, the first gear is engaged and torque is applied by the engine. To change, one of the second gears is engaged, engine torque is reduced by slipping the clutch while electric machine torque is increased. To change again, electric machine torque is reduced to zero, the other second gear is engaged while engine torque transmitted via the first clutch is increased by reducing slipping of the first clutch.

Abstract: A hydrodynamic torque converter includes a housing-mounted impeller, a turbine that is torsionally fixed with respect to a transmission input shaft, and a stator braced by an axial bearing and supported on a freewheeling device between the impeller and the turbine. When attaching the torque converter to a transmission, the freewheel inner ring of the freewheel being slid in a torsionally fixed manner onto a non-rotating hollow stator shaft that is attached to the transmission housing, on the end face facing away from the hollow stator shaft, the freewheel inner ring has an internal shoulder which forms an assembly limit stop for the unattached end of the hollow stator shaft.

Abstract: In a method of operating a motor vehicle with an electronically controlled automatic clutch device, a control device and one or more data-storing devices for values of operating quantities and parameters, the values are stored in at least duplicate form in the data-storing device. The data are stored in prescribed formats and the integrity of the data is checked according to prescribed criteria, to ensure that incorrect data are not used in the operation of the vehicle.