Patent ID: 8224556

Claim:
A method for operating an internal combustion engine, comprising: at a first operating point of the internal combustion engine without exhaust gas recirculation: measuring a first measured value of a load variable of the internal combustion engine, determining a first model value of the load variable as a function of the first measured value of a further operating variable by means of a suction pipe model, adapting at least one parameter of the suction pipe model by means of parameter trimming such that the first model value approaches the first measured value of the load variable or corresponds to the first measured value of the load variable, storing a first value of the parameter trimming, by means of which the parameter of the suction pipe model at the first operating point of the internal combustion engine without exhaust gas recirculation is adapted, and at a second operating point of the internal combustion engine with exhaust gas recirculation: measuring a second measured value of the load variable, determining a second model value of the load variable as a function of a second measured value of the further operating variable by means of the suction pipe model, adapting the parameter of the suction pipe model by means of parameter trimming such that the second model value approaches the second measured value of the load variable or corresponds to the second measured value of the load variable, storing a second value of the parameter trimming, by means of which the parameter of the suction pipe model at the second operating point of the internal combustion engine with exhaust gas recirculation is adapted, comparing the first and second stored values of the parameter trimming with one another, as a function of the comparison, adapting a parameter value of an exhaust gas recirculation model such that the first and the second values of the parameter trimming approach one another or correspond to one another.