Current storage estimation for selective catalytic reduction...

Details Current storage estimation for selective catalytic reduction... Current storage estimation for selective catalytic reduction...

2009-04-03

2010-12-28

Mayes, Melvin C (Department: 1793)

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

C422S111000

Reexamination Certificate

active

07858060

ABSTRACT:
A dosing control system comprises a selective catalytic reduction (SCR) analysis module and a dosing management module. The SCR analysis module estimates an ammonia (NH3) slip rate downstream of an SCR catalyst, an NH3 conversion rate, an NH3 supply rate, and an NH3 oxidation rate. The SCR analysis module estimates an NH3 rate of change based on the NH3 slip, conversion, supply, and oxidation rates and estimates an NH3 storage change based on the NH3 rate of change. The SCR analysis module estimates NH3 stored by the SCR catalyst based on the NH3 storage change. The dosing management module controls dosing agent injection into an exhaust system upstream of the SCR catalyst based on the NH3 stored by the SCR catalyst.

REFERENCES:
patent: 6981368 (2006-01-01), van Nieuwstadt et al.
patent: 7559194 (2009-07-01), Westerberg
patent: 7736595 (2010-06-01), Gady et al.
U.S. Appl. No. 12/417,962, filed Apr. 3, 2009, Gady et al.

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