UPSTREAM NOX ESTIMATION

摘要

A method for controlling operation of an internal combustion engine determines an estimated NOx value as a function of at least one engine operating parameter. The method also determines an actual NOx value using a NOx sensor positioned in an exhaust gas stream of the internal combustion engine. The method detects at least one condition indicative of whether or not the actual NOx value is accurate. The actual NOx value is used for controlling engine operation when the at least one condition indicates that the actual NOx value is accurate, while the estimated NOx value is used for controlling engine operation when the at least one condition indicates that the actual NOx value is inaccurate.

主权项

1. A method for controlling operation of an internal combustion engine, comprising:
determining an estimated NOx value as a function of at least one engine operating parameter; determining an actual NOx value using a NOx sensor positioned in an exhaust gas stream of the internal combustion engine; detecting at least one condition indicative of whether or not the actual NOx value is accurate; controlling engine operation using the actual NOx value when the at least one condition indicates that the actual NOx value is accurate; and controlling engine operation using the estimated NOx value when the at least one condition indicates that the actual NOx value is inaccurate.