Patent ID: 6155049
Filing Date: 2000-12-05
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of controlling the charge air mass flow of a supercharged internal combustion engine having an exhaust gas turbocharger with adjustable turbine geometry (inlet vanes) and a control unit for controlling the operation of said turbocharger, said method comprising the steps of: determining an intake air pressure in an air intake duct and also an exhaust gas pressure in an exhaust gas duct of said engine, determining a pressure difference between said intake air and exhaust gas pressures as an actual differential pressure value, comparing said actual differential pressure value with a desired differential pressure value, generating a control signal directly depending on the deviation of said actual differential pressure value from said desired differential pressure value, and controlling said adjustable turbine geometry during steady state engine operation so as to reduce said deviation, and, during transient engine operation with a load increase, adjusting the turbine geometry so as to reduce the inlet flow cross-section to said turbine for increasing the charge air pressure of the internal combustion engine.