METHOD OF CONTROLLING THE COMBUSTION PHASE OF A FUEL MIXTURE OF A SPARK-INGNITION SUPERCHARGED INTERNAL-COMBUSTION ENGINE, NOTABLY OF GASOLINE TYPE

摘要

The present invention relates to a method of controlling the combustion phase of a fuel mixture of a spark-ignition supercharged internal-combustion engine comprising at least one cylinder (12) with a combustion chamber (14), at least one fuel supply means (48, 52) and spark ignition means (38).;According to the invention, the method consists, for high loads and low speeds of said engine, in determining, during the combustion of the fuel mixture, the value of crank angle (θ′) where the maximum cylinder pressure (P_max) occurs in the combustion chamber ; in comparing the value thus determined with a maximum angle threshold value (θ_max) representative of an abnormal combustion in said chamber ; in detecting the start of an abnormal combustion when the determined value reaches said threshold value and when the ignition means are not actuated ; and in feeding an amount of another fuel into the fuel mixture in order to modify the energy index of this mixture so as to reduce the crank angle where the maximum cylinder pressure occurs.