Patent ID: 6397828
Filing Date: 2002-06-04
Classification: F02D

Abstract:
A method for controlling the titre of the air-fuel mixture in an internal combustion engine (2) provided with at least two cylinders (3), the method comprising the stages of analysing the exhaust gas present in a common exhaust manifold (6) in order to measure at least one value (AFRCOMP) of the overall air-fuel ratio of the cylinders (3), determining an estimated value (AFRCIL; &lgr;CIL; &Dgr;CIL) of the air-fuel ratio of a first cylinder (3) by processing the value (AFRCOMP) of the overall air-fuel ratio, and using this estimated value (AFRCIL; &lgr;CIL; &Dgr;CIL) of the air-fuel ratio of the first cylinder (3) to correct a titre of the air-fuel mixture introduced into the first cylinder (3), the method being characterised in that it comprises the measurement of at least two successive values (AFRCOMP) of the air-fuel ratio of the cylinders (3) and the determination of the estimated value (AFRCIL; &lgr;CIL; &Dgr;CIL) of the air-fuel ratio of the first cylinder (3) by carrying out a linear composition of the two successive values (AFRCOMP) of the overall air-fuel ratio of the cylinders (3).