Systems And Methods For Monitoring The Health Of A Selective Catalytic Reduction Catalyst

Abstract: A system includes a controller programmed to monitor an NH3 storage state of a selective catalytic reduction (SCR) catalyst. The controller is programmed to receive signals representative of NH3 and/or NOx concentrations in a fluid both upstream of an inlet and downstream of an outlet of the SCR catalyst, to receive a signal representative of the measured NH3 storage of the SCR catalyst from at least one RF probe disposed within the SCR catalyst, to utilize a model to generate an estimated NH3 storage of the SCR catalyst based at least on the NH3 and/or NOx concentrations in the fluid both upstream and downstream of the SCR catalyst, to compare the estimated NH3 storage to the measured NH3 storage, and to output a control action for the SCR catalyst based at least on the comparison of the estimated NH3 storage to the measured NH3 storage.

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