METHOD TO CONTROL A SUPERCHARGED INTERNAL COMBUSTION ENGINE PROVIDED WITH A TURBOCHARGER BY MEANS OF AN ESTIMATION OF THE AVERAGE POWER DELIVERED BY THE TURBINE OF THE TURBOCHARGER

A method to control a supercharged internal combustion engine (1) by means of a turbocharger (12) provided with a turbine (13) and a compressor (14) which compresses the air taken in; the control method includes the steps of determining the instantaneous rotation speed (w TC ) of the turbocharger (12); and calculating the average power ( P T ) delivered by the turbine (13) as a function of the absolute value | w TCj | of the j-th harmonic component of the instantaneous rotation speed (w TC ) of the turbocharger (12) and of the instantaneous rotation speed (w TC ) of the turbocharger (12); and controlling the supercharged internal combustion engine (1) as a function of the average power ( P T ) delivered by the turbine (13).