Process for determining a fuel-injection-related parameter for an internal-combustion engine with a common-rail injection system

An apparatus for determining at least one fuel-injection-related parameter of an internal-combustion engine individually for each engine combustion chamber and each injection operation, comprising:

• a common-rail fuel injection system assigned jointly to each engine combustion chamber, said common-rail fuel injection system having a distributor pressure space;
• a pressure sensor coupled with the distributor pressure space for detecting a pressure course in the distributor pressure space in a highly resolved manner for a respective fuel injection operation for a respective combustion chamber;
• means for obtaining a pertaining pressure course pattern from the detected pressure course;
• and
• means for determining at least one fuel-injection-related parameter from the obtained pressure course pattern individually for each combustion chamber and each injection operation using pattern recognition.