Patent ID: 7099762

Claim:
A motor vehicle powertrain comprising a controlled power source, a clutch, an automatically shifted transmission and a data transfer system enabling data to be exchanged between the component parts of the powertrain, an additional power source, and a control system for controlling said controlled power source and said additional power source on the basis of a comparison of the real behavior of the powertrain with a modeled behavior of a powertrain provided with a hydrodynamic torque converter, wherein the vehicle speed is determined in accordance with the following equation V Fahrzeug = r reifen * ∫ [ ( tq eng + tq ISG ) * μ HTC * i AT * i Diff - tq Fahrwid ] theta kfz ⁢ ⅆ t where: μ HTC is the increased torque provided by the hydrodynamic tongue converter i AT is the ear ratio of the automatic transmission i Diff is the gear ratio of the differential r reifen is the tire radius theta kfz is the moment of inertia of the vehicle and is the theoretical driving torque.