METHOD TO MONITOR HC-SCR CATALYST NOX REDUCTION PERFORMANCE FOR LEAN EXHAUST APPLICATIONS
First Claim
1. Method for initiating a regeneration mode in a selective catalytic reduction device of an aftertreatment system utilizing hydrocarbons as a reductant, comprising:
- monitoring a temperature within said aftertreatment system;
monitoring a fuel dosing rate to said selective catalytic reduction device;
monitoring an initial conversion efficiency;
selecting an equation to estimate changes in a conversion efficiency of said selective catalytic reduction device based upon said monitored temperature and said monitored fuel dosing rate;
estimating changes in said conversion efficiency based upon said equation and said initial conversion efficiency; and
initiating a regeneration mode for said selective catalytic reduction device based upon said estimated changes in conversion efficiency.
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Abstract
A method for initiating a regeneration mode in selective catalytic reduction device utilizing hydrocarbons as a reductant includes monitoring a temperature within the aftertreatment system, monitoring a fuel dosing rate to the selective catalytic reduction device, monitoring an initial conversion efficiency, selecting a determined equation to estimate changes in a conversion efficiency of the selective catalytic reduction device based upon the monitored temperature and the monitored fuel dosing rate, estimating changes in the conversion efficiency based upon the determined equation and the initial conversion efficiency, and initiating a regeneration mode for the selective catalytic reduction device based upon the estimated changes in conversion efficiency.
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Citations
16 Claims
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1. Method for initiating a regeneration mode in a selective catalytic reduction device of an aftertreatment system utilizing hydrocarbons as a reductant, comprising:
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monitoring a temperature within said aftertreatment system; monitoring a fuel dosing rate to said selective catalytic reduction device; monitoring an initial conversion efficiency; selecting an equation to estimate changes in a conversion efficiency of said selective catalytic reduction device based upon said monitored temperature and said monitored fuel dosing rate; estimating changes in said conversion efficiency based upon said equation and said initial conversion efficiency; and initiating a regeneration mode for said selective catalytic reduction device based upon said estimated changes in conversion efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Method for estimating conversion efficiency for use in controlling a selective catalytic reduction device of an aftertreatment system utilizing hydrocarbons as a reductant, comprising:
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monitoring a temperature within said aftertreatment system; monitoring a fuel dosing rate to said selective catalytic reduction device; monitoring an initial conversion efficiency; selecting equations for different monitored temperature ranges to estimate changes in said conversion efficiency based upon said monitored temperature and said monitored fuel dosing rate; accumulatively estimating changes in said conversion efficiency based upon said equations and said initial conversion efficiency; and initiating a regeneration mode for said selective catalytic reduction device based upon said estimated changes in conversion efficiency. - View Dependent Claims (13, 14, 15)
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16. Method for estimating conversion efficiency for use in controlling an operative selective catalytic reduction device of an aftertreatment system utilizing hydrocarbons as a reductant, comprising:
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testing an exemplary selective catalytic reduction device operatively similar to said operative selective catalytic reduction device, said testing comprising; iteratively operating said exemplary selective catalytic reduction device through periods of operation with various temperatures and fuel dosing rates; and monitoring conversion efficiency of said exemplary selective catalytic reduction device through each of said periods; determining an equation representative of changes to said conversion efficiency for each of said periods; utilizing said determined equations to track changes in conversion efficiency in said operative selective catalytic reduction device; and controlling initiation of a regeneration mode in said operative selective catalytic reduction device based upon said tracked conversion efficiency.
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Specification