Torque control method of a road vehicle

A control method of the torque of a road vehicle comprising a powertrain system provided with an engine presenting a drive shaft and a driveline which transmits the torque generated by the engine to the road surface through the drive wheels;

• the method comprises the steps of:
• determining a target torque (Te-targ);
• and
• controlling the generation of torque by the engine on the basis of the target torque (Te-targ);
• the method is characterized in that it comprises the further steps of:
• modeling the powertrain system as a single physical component which presents a characteristic mechanical inertia and a characteristic torsional elasticity and which must undergo a corresponding torsion to transmit a certain drive torque;
• determining a current load torque (Tr) of the vehicle;
• determining a target torsion (Δθtarg) of the powertrain system according to the target torque (Te-targ) and the current load torque (Tr);
• determining a current torsion (Δθ) of the powertrain system and a current torsion speed (Δθ′) of the powertrain system;
• determining a requested torque (Te-EC) on the basis of the energy balance according to the target torsion (Δθtarg), the current torsion (Δθ), the current torsion speed (Δθ′), and the current load torque (Tr);
• and
• using the requested torque (Te-EC) on the basis of the energy balance to control the torque generation of the engine.