Method for controlling a fuel metering system of an internal combustion engine

A method for controlling a fuel metering system of an internal combustion engine, wherein an activation duration of at least one electrically operated injector to determines a fuel quantity to be injected, the method comprising:

• performing a null quantity correction, wherein the null quantity correction includes determining a minimum activation duration during which a minimum quantity of fuel is injected, wherein the determination of the minimum activation duration includes adjusting an activation duration from an initial value, and wherein an activation duration in which a change in a characteristic signal appears is selected as the minimum activation duration;
• and
• determining activation durations at a plurality of test points of a quantity characteristics map of the injector, based on the null quantity correction and at least one of:
• a) at least one transfer function that characterizes a relationship between the minimum activation durations and activation durations at the plurality of test points;
• and b) at least one transfer function that characterizes a relationship between the activation durations at the plurality of test points.