A method 1, wherein {HEAD ~ additionally electronically recorded engine operating lines} for constant turbine inlet pressures are provided in the engine performance graph and retrieving from {TAIL ~ the engine performance graph} for various exhaust gas turbocharger speeds compressor mass flow values and compressor pressure ratios, a respective turbine inlet pressure 
retrieving from
A method 1 , wherein { HEAD ~ additionally electronically recorded engine operating lines } for constant turbine inlet pressures are provided in the engine performance graph and retrieving from { TAIL ~ the engine performance graph } for various exhaust gas turbocharger speeds compressor mass flow values and compressor pressure ratios , a respective turbine inlet pressure
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH