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US 2013/0199158 A1Published application
System, method, and apparatus for determining solid storage media quality for a nox reductant
AssigneeCummins Inc.
InventorsCary Henry, Neal W. Currier, Aleksey Yezerets, Michael J. Ruth
Life of this patent
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Abstract
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.
Claims15
A method, comprising:
- determining an operating temperature of a solid storage media in an exhaust aftertreatment system reductant source, 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.
2 more elements
A system, comprising:
- an internal combustion engine producing an exhaust stream, the exhaust stream including an amount of NOx emitted into an exhaust flow path;
- a NOx conversion catalyst in the exhaust flow path that reduces at least a portion of the amount of NOx;
- a reductant source that stores an amount of a NOx reductant in a solid storage media and a reductant supply line that receives gaseous NOx reductant from the reductant source when the solid storage media is heated, wherein the supply line includes a metering device to measure a consumption rate of the gaseous reductant and provides the NOx reductant to the exhaust flow path at a position upstream of the NOx conversion catalyst;
- at least one temperature sensor operably coupled to the solid storage media and at least one pressure sensor operably coupled to the supply line;
- and
- a controller, comprising:
- a reductant conversion module structured to provide expected pressures of the gaseous reductant in the supply line based on the type of solid storage media, the temperature of the solid storage media, and the consumption rate of the gaseous reductant;
- a solid storage media status module structured to an expected pressure of the gaseous reductant based on a current temperature of the solid storage media and a current consumption rate of the gaseous reductant;
- and
- a solid storage media quality module structured to compare an actual pressure in the supply line to the expected pressure and to determine a solid storage media quality indicator from the comparison.
7 more elements
Dependencies are inferred from the claim text.