Selective catalytic reduction system

专利名称：Selective catalytic reduction system发明人：Leo Shead,Alexis Eden,Ronald Silver申请号：US16463612申请日：20171211公开号：US11105236B2公开日：20210831

专利附图：

摘要：A method of treating exhaust gas in an exhaust passage using a selectivecatalytic reduction system is provided. The system comprises a hydrolysis catalyst in thepassage upstream of a SCR catalyst, and a diesel exhaust fluid (DEF) dosing unit forinjecting DEF onto the hydrolysis catalyst at a variable DEF dosing rate. The method

comprises the steps of predicting an initial DEF dosing rate for converting all nitrogenoxide (NOx) contained in the exhaust gas, and estimating an amount of ammonia storedon the SCR catalyst. The method further comprises the steps of measuring a NOxconversion rate for the system, and adjusting the initial DEF dosing rate based upon theammonia storage estimate and the measured NOx conversion rate to produce a firstadjusted DEF dosing rate. An amount of ammonia-equivalent stored on the hydrolysiscatalyst is then estimated, and the first adjusted DEF dosing rate is adjusted based uponthe ammonia-equivalent storage estimate to produce a second adjusted DEF dosing rate.DEF is then injected at the second adjusted DEF dosing rate.

申请人：Perkins Engines Company Limited

地址：Peterborough GB

国籍：GB

更多信息请下载全文后查看