Method and device for controlling the fuel quantity injected into an internal combustion engine, in particular a diesel engine equipped with a common rail injection system

A method of controlling the fuel quantity injected into an internal combustion engine (1) having a number of injectors (4); for each injection, the method including the steps of determining (14) a nominal energization time (EN); determining (15) a correction energization time ( ET); determining (16), in the event the required nominal fuel quantity (Qi) is below a predetermined threshold (SQ), a corrected energization time (EC) by correcting the nominal energization time (EN) as a function of the correction energization time ( ET); and exciting an injector for the corrected energization time (EC); the correction energization time ( ET) being determined by: performing, in the presence of a predetermined series of operating conditions of the engine (1), a succession of energizations of the injector (4) of gradually increasing energization times (ET); determining a quantity (Acc) related to the output torque of the engine (1); and calculating the correction energization time ( ET) as a function of the quantity (Acc) related to the output torque.