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