METHOD, SYSTEM, AND APPARATUS FOR DIAGNOSING AN EXHAUST AFTERTREATMENT COMPONENT

摘要

An apparatus includes an engine output module that determines an engine output power parameter for an engine. The apparatus includes an output power threshold module that determines if the engine output power parameter is below an output power threshold. The apparatus includes a NOx module that determines a nitrogen oxide (“NOx”) efficiency of a selective catalytic reduction (“SCR”) system in response to the output power threshold module determining that the determined engine output power parameter is below the output power threshold. The SCR system is in exhaust receiving communication with the engine. The apparatus includes a NOx threshold module that determines if the NOx efficiency is below a NOx efficiency threshold, and a NOx warning module that sends a NOx alarm signal in response to the NOx threshold module determining that the NOx efficiency is below the NOx efficiency threshold.

主权项

1. An apparatus comprising:
a NOx change module structured to determine an amount of change in a nitrogen oxide (“NOx”) efficiency of a selective catalytic reduction (“SCR”) system within a sampling window; a NOx change threshold module structured to determine the amount of change in the NOx efficiency exceeds a NOx efficiency change threshold; and a NOx warning module structured to provide a NOx alarm in response to a NOx efficiency below a NOx efficiency threshold and the amount of change in the NOx efficiency exceeding the NOx efficiency change threshold.