Method and system for controlling a lean NOx trap purge cycle

摘要

An adaptive control method for managing a LNT purge cycle includes a model for predicting the feedgas NOx and CO emissions for both stratified and homogeneous engine operating conditions where the parameters of the model are updated based on real-time HEGO sensor measurements in order to adjust the model to ensure robustness of performance in determining the entry and exit condition for purge operation to thereby reduces HC/CO breakthrough, and to improve purge efficiency and fuel economy.