Method of regulating and controlling an internal combustion engine

A method of regulating and controlling an internal combustion engine forming part of a hybrid power unit of a self-propelled vehicle, the method employing: a first graph showing the power transmitted by the engine as a function of the rotational speed of a drive shaft, and for different injector openings of a power-regulating injection device; and a second graph showing the torque transmitted by the drive shaft as a function of the rotational speed of the drive shaft, and for different injector openings of the power-regulating injection device; the second graph also showing the injector opening of the power-regulating injection device.