System, method, and apparatus for determining solid storage media quality for a NO_xreductant

摘要

A system and method includes an exhaust aftertreatment system for an internal combustion engine having a reductant stored in a solid storage media. The reductant is released by heating the solid storage media to convert the reductant to gaseous form. The system and method determines the quality of the solid storage media by measuring operating parameters of the aftertreatment system and comparing the operating parameters to expected parameters stored in a memory of a controller of the system.

主权项

1. A method, comprising:
heating a solid storage media in an exhaust aftertreatment system reductant source; determining an operating temperature of the solid storage media, the solid storage media storing a reductant and when heated the solid storage media releases the reductant as a gas into a supply line connected to an exhaust flow path; determining a consumption rate of the gaseous reductant released from the solid storage media; determining an actual pressure of the gaseous reductant in the supply line; and comparing the actual pressure to an expected pressure of the gaseous reductant in the supply line and determining a solid storage media quality indicator from the comparison, wherein the expected pressure is determined from the operating temperature and the consumption rate.