EXHAUST AFTERTREATMENT SYSTEM WITH AGING MONITORING OF AN AMMONIA SLIP CATALYST

摘要

A system (10) includes a controller (44). The controller is configured to monitor a catalytic activity within an ASC assembly (24) that converts ammonia (NH 3 ) within a fluid received from a three-way catalyst (TWC) assembly (22) into nitrogen (N 2 ) to determine whether the catalytic activity in the ASC assembly has aged. The controller (44) is configured to adjust a temperature of the fluid flowing into an inlet (32) of the ASC assembly by controlling an amount of oxidant injected via an oxidant injection system (40) into the fluid upstream of the inlet (32) of the ASC assembly based on a determination that the catalytic activity in the ASC assembly has aged.