Patent ID: 7076953

Claim:
A method for controlling an internal combustion engine, the engine including an engine block defining a plurality of cylinders, a controller, a variable geometry turbocharger (VGT) system and an exhaust gas recirculation (EGR) system, the VGT system providing pressurized intake air to the plurality of cylinders and the EGR system providing a metered portion of the exhaust gases to the plurality of cylinders, the controller communicating with the VGT system and the EGR system to control the engine, the method comprising: selecting an engine operating mode from a plurality of modes including a boost mode and an EGR mode; when the selected engine operating mode is the boost mode, controlling the VGT system with a closed loop based on a desired boost pressure and a measured boost pressure such that the measured boost pressure tracks the desired boost pressure; and when the selected engine operating mode is the EGR mode, controlling the VGT system with a closed loop based on a desired EGR rate and a measured EGR rate such that the measured EGR rate tracks the desired EGR rate, and controlling the EGR system with a closed loop based on a desired boost pressure and a measure boost pressure such that the measured boost pressure tracks the desired boost pressure.