DIAGNOSTIC METHODS FOR A HIGH EFFICIENCY EXHAUST AFTERTREATMENT SYSTEM

摘要

An apparatus includes a nitrogen oxide (NOx) module and a selective catalytic reduction (SCR) diagnostic module. The NOx module is in exhaust gas communication with an exhaust flow of an exhaust aftertreatment system from an engine. The NOx module is structured to interpret NOx data indicative of an amount of NOx exiting the engine and an amount of NOx exiting the exhaust aftertreatment system, and determine a NOx conversion efficiency fault is present based on the amount of NOx exiting the engine and the amount of NOx exiting the exhaust aftertreatment system. The SCR diagnostic module is structured to determine at least one of a SCR catalyst and a diesel particulate filter including a coating of a SCR reaction catalyst (DPF-SCR) are responsible for the NOx conversion efficiency fault based on at least one of a reductant slip amount and a NOx conversion value across at least one of the SCR catalyst and the DPF-SCR.

主权项

1. An apparatus, comprising:
a nitrogen oxide (NOx) module in exhaust gas communication with an exhaust flow of an exhaust aftertreatment system from an engine, the NOx module structured to:
interpret NOx data indicative of an amount of NOx exiting the engine and an amount of NOx exiting the exhaust aftertreatment system; anddetermine a NOx conversion efficiency fault is present based on the amount of NOx exiting the engine and the amount of NOx exiting the exhaust aftertreatment system; and a selective catalytic reduction (SCR) diagnostic module structured to determine at least one of a SCR catalyst of the exhaust aftertreatment system and a diesel particulate filter having a coating of a SCR reaction catalyst (DPF-SCR) of the exhaust aftertreatment system are responsible for the NOx conversion efficiency fault based on at least one of a reductant slip amount and a NOx conversion value across at least one of the SCR catalyst and the DPF-SCR.