Patent ID: 8165783

Claim:
A method of controlling the injection quantity of a chargeable and dischargeable injector of an internal combustion engine, in which an injector voltage and an injector charge are determined, by means of which an energy, which is stored in the injector and correlates with the injection quantity, as well as an injector capacity are calculated, the method comprising the steps of: determining a charge value and a voltage value after the end of a charging phase of the injector, and calculating a first energy value and a first capacity value from said charge value and said voltage value, if a time length of a retaining phase between the charging phase and the discharge phase is longer than a definable period of time: determining a new voltage value and a new charge value of the injector, calculating a second capacity value from said new charge value and said new voltage value, calculating a second energy value based on a square of the charge value and the second calculated capacity value, determining a correction value based on the first calculated energy value and the second calculated energy value, and storing the correction value in a first characteristics map, and controlling said injector based on the calculated second energy value.