Strategy management of a motor vehicle boot chain especially during repeated stops of the vehicle

A power train (1) for motor vehicles, comprising: - an internal combustion engine (2) comprising a flywheel (4), - an electric starter (13) configured for rotating the internal combustion engine (2), - an angular position sensor of the flywheel (6). The drivetrain (1) comprises an evaluation unit (7) configured to determine, during actuation of the starter (13) from at least one signal (φ) of the sensor (6) angular position, a angular velocity of the steering wheel angular velocity -or a reverse driving- calculated on a lower angular distance of up to one turn between a first angular position of the steering wheel, a second steering wheel position, preset as a reference position.