DIAGNOSTIC SYSTEMS AND METHODS FOR SELECTIVE CATALYTIC REDUCTION (SCR) SYSTEMS BASED ON NOx SENSOR FEEDBACK

摘要

A selective catalytic reduction (SCR) system includes a first sensor that determines a first concentration of NOx, a second sensor that determines a second concentration of NOx and NH3, and a fault determination module. The fault determination module diagnoses a fault in at least one of a dosing agent and a catalyst in an SCR device based on the first and second concentrations.