Motor vehicle propulsion system with coasting mode

The system has a system control unit (SCU) to determine an immediate value of a traction force and a speed of a motor vehicle. The unit has a memory to store data to define a map that compares the values of an accelerator position and speed with the force. The unit disengages a clutch when the accelerator is released and the speed is less than a preset value, and reengages the clutch when a brake control pedal is actuated.