METHOD FOR OPERATING A SPARK-IGNITED INTERNAL COMBUSTION ENGINE

Method for operating a spark-ignited internal combustion engine with at least one cylinder and a piston movable in the at least one cylinder and at least one prechamber connected to the at least one cylinder, wherein the method comprises the steps of: - forming a combustible mixture by mixing a first fuel and air to the greatest extent homogeneously and introducing this mixture into the at least one cylinder, - compressing the combustible mixture with the piston in a compression stroke, introducing a second fuel into the prechamber at an introduction time before the start of combustion, thereby creating a prechamber charge, wherein the second fuel has the same or a different chemical composition and/or concentration with respect to the first fuel, - spark igniting the prechamber charge, wherein the emission of the at least one cylinder and/or the stress caused by the combustion on the at least one cylinder are observed and if the emissions and/or the mechanical stress exceed respective predetermined threshold values, individually for the at least one cylinder the chemical composition and/or the quantity of second fuel supplied to the prechamber, and/or the temperature of the cylinder charge, and/or the ignition timing are changed in such a manner that the emissions and/or the mechanical stress fall below their respective predetermined threshold values.