DOSING AGENT INJECTION CONTROL FOR SELECTIVE CATALYTIC REDUCTION CATALYSTS
First Claim
1. A dosing control system comprising:
- a selective catalytic reduction (SCR) analysis module that estimates ammonia (NH3) stored by an SCR catalyst, maximum NH3 storage capacity of said SCR catalyst, NH3 slip downstream of said SCR catalyst, NH3 oxidation, and NH3 conversion through reaction with nitrogen oxides (NOx), wherein said NH3 stored is estimated based an amount of dosing agent injected, said NH3 slip, said NH3 oxidation, and said NH3 conversion; and
a dosing management module that controls dosing agent injection into an exhaust system upstream of said SCR catalyst based on said NH3 stored by said SCR catalyst and said maximum NH3 storage capacity.
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Abstract
A dosing control system comprises a selective catalytic reduction (SCR) analysis module and a dosing management module. The SCR analysis module estimates ammonia (NH3) stored by an SCR catalyst, maximum NH3 storage capacity of the SCR catalyst, NH3 slip downstream of the SCR catalyst, NH3 oxidation, and NH3 conversion through reaction with nitrogen oxides (NOx). The NH3 stored is estimated based an amount of dosing agent injected, the NH3 slip, the NH3 oxidation, and the NH3 conversion. 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 and the maximum NH3 storage capacity.
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Citations
18 Claims
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1. A dosing control system comprising:
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a selective catalytic reduction (SCR) analysis module that estimates ammonia (NH3) stored by an SCR catalyst, maximum NH3 storage capacity of said SCR catalyst, NH3 slip downstream of said SCR catalyst, NH3 oxidation, and NH3 conversion through reaction with nitrogen oxides (NOx), wherein said NH3 stored is estimated based an amount of dosing agent injected, said NH3 slip, said NH3 oxidation, and said NH3 conversion; and a dosing management module that controls dosing agent injection into an exhaust system upstream of said SCR catalyst based on said NH3 stored by said SCR catalyst and said maximum NH3 storage capacity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18)
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10. A dosing control method comprising:
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estimating a maximum ammonia (NH3) storage capacity of a selective catalytic reduction (SCR) catalyst; estimating NH3 slip downstream of said SCR catalyst; estimating NH3 oxidation; estimating NH3 conversion through reaction with nitrogen oxides (NOx); estimating NH3 stored by said SCR catalyst based an amount of dosing agent injected, said NH3 slip, said NH3 oxidation, and said NH3 conversion; and controlling dosing agent injection into an exhaust system upstream of said SCR catalyst based on said NH3 stored by said SCR catalyst and said maximum NH3 storage capacity. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification