A VARIABLE GEOMETRY TURBOCHARGER CONTROL METHOD AND SYSTEM FOR AN ENGINE AIR SYSTEM WITH A VARIABLE GEOMETRY TURBOCHARGER HAVING ADJUSTABLE VANES

摘要

A variable geometry turbocharger control method and system for an engine air system with a variable geometry turbocharger having adjustable vanes. The method includes monitoring engine parameters, generating engine state estimates using an engine observer model, generating measured engine states based on the monitored engine parameters, computing observer error based on the differences between the measured and modeled engine states, generating model correction factors, and generating commands for adjusting the vane position of the variable geometry turbocharger. An inverse engine observer model can generate the desired variable geometry turbocharger vane positions. The method can include generating feedback actuator commands in generating the desired variable geometry turbocharger vane positions. The correction factors can include fresh air, EGR and/or turbine mass flow correction factors.