Exhaust Aftertreatment Control System And Method For Maximizing Fuel Efficiency While Reducing Emissions

摘要

An engine exhaust treatment and fuel efficiency improvement system includes a NOx module that determines a quantity of NOx emitted from an engine. A selective catalytic reduction (SCR) efficiency module determines a SCR efficiency to reduce the determined NOx quantity below a predetermined threshold. A reagent dosing module determines a quantity of reagent required to reduce the NOx quantity below the predetermined threshold. An injection optimization module determines whether an increase in system operating efficiency may be obtained by changing an injected reagent quantity and an engine operating parameter in cooperation with each other while maintaining the NOx quantity below the threshold, the system being operable to change the reagent injection quantity and engine operating parameter to increase system efficiency.

主权项

1. An engine exhaust treatment and fuel efficiency improvement system, comprising:
a NOx module that determines a quantity of NOx emitted from an engine; a selective catalytic reduction (SCR) efficiency module that determines a SCR efficiency to reduce the determined NOx quantity below a predetermined threshold; a reagent dosing module that determines a quantity of reagent required to reduce the NOx quantity below the predetermined threshold; and an injection optimization module that determines whether an increase in system operating efficiency may be obtained by changing both an injected reagent quantity and an engine operating parameter in cooperation with each other while maintaining the NOx quantity below the threshold, wherein the system injection optimization module outputs a signal to change the reagent injection quantity and the engine operating parameter to increase system efficiency.