Patent ID: 7878943

Claim:
A drive train of a motor vehicle, comprising: a drive machine; a transmission; and a control device for actuating the drive machine, the control device adapted for limiting an output torque (M Ami ) of the drive machine to a first maximum value (M Max1 ) or a second, higher maximum value (M Max2 ) in order to protect the transmission, wherein the control device has a signal transmitting connection to a roadway information device which supplies information relating to a profile of the roadway in the direction of travel of the motor vehicle, and the control device is adapted for carrying out a changeover from the first maximum value (M Max1 ) to the second maximum value (M Max2 ) as a function of said information relating to the profile of the roadway, and wherein the transmission is embodied as an automatic transmission and is actuated by the control device, such that when a request for an increased torque (M GAus ) at the output of the transmission is made, the control device performs: the requested increased torque test, which tests whether the requested torque (M GAus ) can be set in a current gear speed of the transmission with the output torque (M Ami ) of the drive machine which is higher than the first maximum value (M Max1 ) and lower than the second maximum value (M Max2 ), and a roadway profile test, which tests whether owing to the information relating to the profile of the roadway it is to be expected that a necessary torque of the drive machine will remain lower than the second maximum value (M Max2 ) within a section of the roadway ahead of the motor vehicle, and in the case of the result of both tests being positive: the output torque (M Ami ) of the drive machine is limited to the second maximum value (M Max2 ), the output torque (M Ami ) of the drive machine is set so that the torque (M GAus ) at the output of the transmission is increased to the requested increased torque, and the current gear speed of the transmission is maintained.