FRESH AIR FLOW AND EXHAUST GAS RECIRCULATION CONTROL SYSTEM AND METHOD

摘要

A fresh air and exhaust gas control method and system for an engine air system with an air throttle and exhaust gas recirculation (EGR) valve. 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 air throttle and EGR valve. An inverse engine observer model can generate the desired air throttle and EGR valve positions. The method can include generating feedback actuator commands in generating the desired air throttle and EGR valve positions. The correction factors can include fresh air, EGR and/or turbine mass flow correction factors.

主权项

1. A fresh air and exhaust gas control method for an engine having an air system with an air throttle and an exhaust gas recirculation (EGR) valve; the control method comprising:
monitoring parameters of the engine using a plurality of sensors; modeling the air system and generating engine state estimates using an engine observer model; generating measured engine states based on the monitored engine parameters from the plurality of sensors; computing an observer error based on the differences between the measured engine states and the engine state estimates; generating model corrections based on the observer error, the model corrections being input to the engine observer model; generating a desired air throttle position and a desired EGR valve position based on setpoint commands, the monitored engine parameters, the model corrections and the engine state estimates; adjusting the air throttle based on the desired air throttle position; and adjusting the EGR valve based on the desired EGR valve position.