| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust aftertreatment system for an internal combustion engine, and in particular, a method for controlling reductant injection.SOLUTION: A system includes an exhaust aftertreatment system 10 configured to treat emissions from a combustion engine 12. The exhaust aftertreatment system includes a selective catalytic reduction catalyst assembly 34 and at least one radio frequency probe 36 disposed within the SCR catalyst assembly. A controller 28 is coupled to the exhaust aftertreatment system and utilizes an NHstorage estimate measured by the at least one RF probe and an NHstorage estimate determined by an NHstorage estimate model to output a control action for a reductant injection system. The NHstorage estimate model utilizes measured concentrations of nitrogen oxides (NO) in the fluid upstream 40 or downstream of the SCR catalyst and/or measured concentrations of NHin the fluid upstream or downstream of the SCR catalyst, and utilizes the NHstorage measurement from the at least one RF probe to determine the NHstorage estimate.SELECTED DRAWING: Figure 1 |
