Abstract: Method for determining the progression of the load torque in an internal-combustion engine, comprising, for each combustion cycle of the engine, the steps of detecting the progression of the instantaneous angular velocity of the crankshaft in at least one given time interval of the combustion cycle; determining the progression of the pressure inside the cylinders of the engine for the combustion cycle on the basis of the progression of the instantaneous angular velocity; and determining the progression of the load torque for the combustion cycle on the basis of the progression of the instantaneous angular velocity and the pressure inside the cylinders.

Abstract: Method for determining the progress of internal pressure of a cylinder in an internal combustion engine, defining for each combustion cycle of the engine, the phases of defining the effective operating point of the engine according to the value assumed by a number of operational parameters of the engine; recording the progress of immediate angular speed of the engine shaft; calculating a transfer function involving the angular speed and the internal pressure of the cylinder at the effective defined operational point, on the basis of a plurality of reference transfer functions between internal pressure and angular speed relative to reference operating points of the engine; and deriving the progress of internal pressure at the cylinder of the transfer function at the actual operating point and of the progress of angular speed.