Retrofit aftertreatment system for treating diesel exhaust

摘要

An exhaust aftertreatment system for diesel engines includes a filtration station, a NOx reduction station, a temperature sensor, a pressure data generator, a NOx sensor, a reductant dispenser, and a controller. The filtration station filters particulate material from the exhaust. The NOx reduction station reduces NOx concentration in the exhaust. The temperature sensor generates first data that is representative of a temperature of the exhaust. The pressure data generator generates second data that is indicative of a pressure differential across a control volume that is located at the NOx reduction station. The control volume includes at least one catalyzed substrate. The NOx sensor generates third data that is representative of the NOx concentration in the exhaust. The reductant dispenser dispenses reductant into the exhaust. The controller controls a dosing rate of the reductant dispenser. The controller uses the first, second, and third data to determine the dosing rate.

主权项

1. An exhaust aftertreatment system for treating exhaust generated by a diesel engine, the system comprising:
a filtration station for filtering particulate material from the exhaust; a substrate located downstream from the filtration station; a pressure data generator for generating data indicative of a pressure differential across a constant flow area control volume of the exhaust aftertreatment system, the constant flow area control volume including the substrate; a reactant dispenser for dispensing reactant into the exhaust; and a controller that controls a dosing rate at which the reactant dispenser dispenses the reactant into the exhaust, wherein the controller uses the data indicative of the pressure differential across the constant flow area control volume as a parameter for determining the dosing rate at which the reactant dispenser dispenses the reactant into the exhaust, and wherein the controller determines an exhaust flow rate based on a correlation of the data from the pressure data generator with the constant flow area control volume.