METHOD OF CONTROLLING AN ENGINE WITH AN EGR SYSTEM.

摘要

A method of controlling an internal combustion engine (12) includes determining an exhaust gas recirculation (EGR) command signal based on at least one engine condition, and determining a variable geometry turbocharger (VGT) command signal based on at least one engine condition and at least partially based on the EGR command signal. Advantageously, the EGR system (66) and VGT system (52) may be continuously and simultaneously controlled (22), taking into account the effects of each system on the other, to provide improved and more precise control over engine air flow. In an alternative embodiment, an engine (12) may be controlled with a feedback control system where engine intake chemical composition is the feedback variable.