Dual leg aftertreatment system

Abstract

A method of controlling an exhaust gas aftertreatment system 100 to control flow imbalance includes receiving emissions values from a plurality of sensors 118, determining a real-time conversion efficiency for each of a first bank 102 and a second bank 104 of the aftertreatment system based on the emissions values, determining a real-time conversion metric for the aftertreatment system based on the real-time conversion efficiency for the banks, and initiating a cleaning operation to clean at least one of the first bank or the second bank based on a determination that the real-time conversion metric satisfies an upper threshold value. An engine system includes a control system with an engine outlet NOx sensor 120, a first system outlet NOx sensor 122 in the first bank, a second system outlet NOx sensor 124 in the second bank, and a cleaning system.