Patent ID: 6050093
Filing Date: 2000-04-18
Classification: F02B,F02D,Y02T

Abstract:
A method of controlling a supercharged internal combustion engine including an exhaust gas turbocharger having an exhaust gas turbine with variable turbine inlet vanes and a charge air compressor, said internal combustion engine having an engine performance graph including control parameters' for the operation of the engine corresponding to a multitude of engine operating points, and an engine control unit to which said control parameters are supplied as input values for generating engine control signals on the basis of a comparison of the input values with actual engine operating values, said method comprising the steps of:Providing, in said engine performance graph, an electronically recorded compressor performance graph area of the charge air compressor which represents a particular relationship between mass flow through the compressor and total pressure ratio for various exhaust gas turbocharger speeds, providing in said engine performance graph furthermore a multitude of engine operating curves for constant guide vane positions of the exhaust gas turbine and constant engine speed for various engine loads and various engine operating modes (engine power operation, engine braking operation, exhaust gas recirculation operation), retrieving from the performance graph a preferred guide vane position for the exhaust gas turbine inlet vanes for a particular engine operating mode depending on engine load and engine speed, and accordingly adjusting the position of the exhaust gas turbine inlet vanes.