Zf Friedrichshafen Ag

Yvonne Wiegand

Markus Eisele

A method for operating a drive-train of a motor vehicle with a drive aggregate in the form of a hybrid drive system () which comprises at least one electric machine (), an internal combustion engine (), a transmission (), a drive output () and a brake system which comprises at least one wear-free permanent brake (). When a braking torque is required, the braking torque is distributed between the electric machine () and the wear-free permanent brake (). At the beginning of a braking torque demand, the required brake torque is provided exclusively by the electric machine (). Thereafter, as a function of characteristics of the wear-free permanent brake, the braking torque demand is transferred, in a controlled manner, from the electric machine to the wear-free permanent brake () so that the sum of the braking torques provided at the drive output () corresponds to the required braking torque.

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Nuremberg, Germany

Yvonne Wiegand