System and method for controlling ammonia (NH3) storage at low nitrogen oxide (NOx) mass flow rates

摘要

A control system comprising an ammonia (NH) storage level determination module that determines an NH storage level in an exhaust system, a target NH storage level determination module that determines a target NH storage level based on an exhaust gas temperature, and a nitric oxide (NO) - A mass flow control module that regulates a NO mass flow rate based on a difference between the NH storage level and the target NH storage level. A method comprises determining an NH storage level in an exhaust system, determining a target NH storage level based on an exhaust gas temperature, and controlling an NO mass flow based on a difference between the NH storage level and the target NH storage level ,