METHOD FOR OPERATING A COMBUSTION ENGINE

Method for operating a compression ignition internal combustion engine, with at least one cylinder and a piston (3) movable in the at least one cylinder (2), the method comprising the steps of: - forming a combustible mixture by mixing a first fuel (F1) and air (A) as homogeneously as possible, - introducing this mixture into the at least one cylinder (2), - compressing the combustible mixture with the piston (3) in a compression stroke, - supplying a second fuel (F2) to the combustible mixture during the compression stroke but before the start of combustion, thereby creating a cylinder charge, wherein the second fuel (F2) has a higher propensity for self-ignition than the first fuel (F1), - continuing the compression stroke until combustion begins at those points in the cylinder (2) where the concentration of the second fuel (F2) and/or the temperature of the mixture is highest, wherein a temperature of the cylinder charge, or the quantity of the second fuel (F2) which is supplied to the combustible mixture, or a combination thereof, is selected such that a desired combustion duration can be achieved.