Method for determining optimized fuel injection history

A closed-loop control feedback method for determining an optimized fuel injection profile of fuel in an internal combustion engine, comprising the steps of:

• determining a current injection profile;
• determining a setpoint combustion profile that extends over an entire combustion cycle,
• determining at least two influential parameters that influence the setpoint combustion profile from the group consisting of:
• a cylinder pressure gradient of a cylinder pressure increase at the start of combustion,
• a cylinder peak pressure,
• an indicated mean effective pressure, and
• a start of combustion,
• determining an actual value for each of the at least two determined influential parameters and at least two manipulated variables, one of the at least two manipulated variables corresponds to one of the at least two determined influential parameters and the other one of the at least two manipulated variables corresponds to the other one of the at least two determined influential parameters, each one of the at least two manipulated variables that correspond to the at least two determined influential parameters, respectively, is a scaling factor that is a continuously adjustable value and is used for minimizing a difference in a value between each of the at least two determined influential parameters and the actual value of the respective influential parameter;
• determining a corrected fuel injection profile in the closed-loop control based on the determined at least two influential parameters and the difference in value between each of the at least two determined influential parameters and the actual value of the respective influential parameter is a controlled variable,
• generating a corrected fuel injection profile using the determined at least two manipulated variables and the controlled variable for each one of the at least two influential parameters to reduce the value deviation in value between each of the at least two determined influential parameters and the actual value of the respective influential parameter,
• controlling the current injection profile using the generated corrected fuel injection profile to adjust the current injection profile, and
• repeating iteratively the preceding steps,
• wherein the scaling factor is determined by a closed-loop controller to reduce the value deviation between each of the at least two determined influential parameters and the actual value of the respective influential parameter for the current injection profile during the iterative repetition of generating the corrected fuel injection profile in the closed-loop control and adjusting the current injection profile.