Patent ID: 9091189
Filing Date: 2015-07-28
Classification: B01D,F01N,G01N,Y02A,Y02T,Y10T

Abstract:
1. A system for mitigating a urea deposit within a selective catalytic reduction (SCR) catalyst and SCR piping in exhaust receiving communication with an exhaust gas stream produced by an engine system, the exhaust gas stream flowing from an engine of the engine system to a tailpipe of the engine system, the system comprising: a reductant delivery system configured to inject reductant into the exhaust gas stream upstream of the SCR catalyst; an SCR NH a controller having an SCR catalyst regeneration module in electrical communication with the reductant delivery system and the SCR NH wherein the SCR catalyst regeneration module is operable to initiate an SCR regeneration event when the determined mass of the accumulated urea deposit is greater than a deposit upper threshold limit, and wherein the SCR catalyst regeneration module is structured to terminate the SCR regeneration event when the level of NH