Method for the determination of the injection beginning time and the injection quantity of the fuel in normal operation of an internal combustion engine, - dynamic pressure oscillations which can be assigned to one cylinder of the internal combustion engine being measured in normal operation in the inlet section of the relevant internal combustion engine, at a defined operating point in the case of fuel injection in synchronism with induction, and a corresponding pressure oscillation signal being produced therefrom, and a crankshaft phase angle signal being determined at the same time, - a reference base pressure oscillation signal being provided, for the provision of which the dynamic pressure oscillations which can be assigned to one cylinder are measured in the inlet section without fuel injection or in the case of direct fuel injection into the closed combustion chamber in a manner which is dependent on the crankcase phase angle, and the reference base pressure oscillation signal being generated therefrom and being stored, and - the injection signal component which is caused by way of the fuel injection being calculated from the pressure oscillation signal by way of subtraction of a reference base pressure oscillation signal, and - the signal phase position and the signal amplitude of the injection signal component being determined in relation to the crankshaft phase angle signal, and - the injection beginning time being determined on the basis of the determined signal phase position of the injection signal proportion using reference phase positions, and - the injection quantity being determined on the basis of the determined signal amplitude of the injection signal component using reference amplitudes. - dynamic pressure oscillations which can be assigned to one cylinder of the internal combustion engine being measured in normal operation in the inlet section of the relevant internal combustion engine, at a defined operating point in the case of fuel injection in synchronism with induction, and a corresponding pressure oscillation signal being produced therefrom, and a crankshaft phase angle signal being determined at the same time, - a reference base pressure oscillation signal being provided, for the provision of which the dynamic pressure oscillations which can be assigned to one cylinder are measured in the inlet section without fuel injection or in the case of direct fuel injection into the closed combustion chamber in a manner which is dependent on the crankcase phase angle, and the reference base pressure oscillation signal being generated therefrom and being stored, and - the injection signal component which is caused by way of the fuel injection being calculated from the pressure oscillation signal by way of subtraction of a reference base pressure oscillation signal, and - the signal phase position and the signal amplitude of the injection signal component being determined in relation to the crankshaft phase angle signal, and - the injection beginning time being determined on the basis of the determined signal phase position of the injection signal proportion using reference phase positions, and - the injection quantity being determined on the basis of the determined signal amplitude of the injection signal component using reference amplitudes.