Patent ID: 8287430

Claim:
A method for operating a drive train ( 1 ) in a motor vehicle with a dual mass flywheel ( 9 ) driven by an internal combustion engine ( 2 ) via a crankshaft ( 3 ) and at least a transmission input shaft ( 5 ) of a transmission ( 6 ) that can be coupled with an output part ( 7 ) of the dual mass flywheel ( 9 ), comprising: effecting a hysteresis-laden damping device ( 8 ) between an input part ( 4 ) and the output part ( 7 ); influencing, using the hysteresis-laden damping device, engine torque output from the internal combustion engine ( 2 ) and load torque transmitted to the at least a transmission input shaft ( 5 ) through a hysteresis characteristic; constantly determining rotation speeds of the input part and of the output part; and determining in real time depending on a differential angle determined from the rotation speeds between the input part ( 4 ) and the output part ( 7 ) and from characteristic numbers of the damping device ( 8 ), a characteristic disturbance torque for influencing at least the load torque, wherein the characteristic numbers at least partially result from stiffness and friction behavior of the damping device.