Patent ID: 9133747
Filing Date: 2015-09-15
Classification: F01N,Y02T

Abstract:
1. An exhaust treatment system, comprising: a selective catalyst reduction filter (SCRF) device, the SCRF device including a filter portion having a washcoat disposed thereon defining a washcoat thickness (WCT); a reductant delivery system configured to inject a reductant that reacts with the washcoat; at least one pressure sensor that determines a pressure differential across the SCRF; a reductant storage module including an electronic processor that executes instructions stored in memory, the reductant storage module in electrical communication with the reductant delivery system and configured to determine a reductant setpoint that controls an amount of reductant injected from the reductant delivery system; and a WCT compensation module including an electronic processor that executes instructions stored in memory, the WCT compensation module in electrical communication with the reductant storage module, the WCT compensation module configured to determine a WCT compensation value based the WCT and to electrically communicate a WCT compensation value to the reductant storage module to control the amount of reductant injected from the reductant delivery system, wherein the WCT is based on a the pressure differential indicated by a pressure signal output by the at least one pressure sensor.