Patent ID: 6067800
Filing Date: 2000-05-30
Classification: F02B,F02D,F02M,Y02T

Abstract:
A method of estimating the actuator position of a variable geometry turbocharger (VGT) in a compression ignition engine having an EGR system including a valve connecting an intake manifold and exhaust manifold of the engine, said VGT including a compressor connected to a turbine having an adjustable inlet guide vane responsive to a VGT actuator signal, the compressor in communication with the intake manifold and the turbine guide vane in communication with the exhaust manifold, the method comprising the steps of:determining a temperature value (T.sub.2) indicative of the exhaust manifold temperature;determining a turbine flow value (W.sub.2t) indicative of the mass flow rate through the turbocharger turbine;determining a pressure value (p.sub.2) indicative of the exhaust manifold pressure;determining a back-pressure value (p.sub.exs) indicative of the turbine back-pressure; andgenerating an VGT actuator position estimate (.alpha..sub.vgt) as a function of W.sub.2t, T.sub.2, p.sub.2, and p.sub.exs.