Patent ID: 6279559
Filing Date: 2001-08-28
Classification: F02D,Y02T

Abstract:
A control method for controlling injection of an internal combustion engine (1) comprising a number of injectors (12) for injecting fuel for a respective operating injection time (TJO) in each operating state of the engine (1), and an oxygen concentration sensor (10) generating a composition signal (S) correlated to the oxygen difference in the exhaust gases with respect to a stoichiometric condition; each of said injectors (12) being assigned, in each operating state of the engine (1), a respective calibration injection time (TJC) determined at an initial engine calibration stage using a reference fuel; for a given operating state of the engine (1), said method being characterized by comprising the steps of:a) determining an intermediate injection time (TJM) as a function of a number (N) of operating injection times (TJO) of said injectors (12);b) calculating a current correction coefficient (KCN) as a function of said intermediate injection time (TJM) and of a reference injection time (TJR) determined at said initial engine calibration stage using said reference fuel; andc) for said operating state of the engine (1), determining a said operating injection time (TJO) as a function of a respective said calibration injection time (TJC); of a closed-loop injection time (TJS) depending on said composition signal (S); and of said current correction coefficient (KCN).