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US 2011/0209461 A1Published application
System, method, and apparatus for determining aftertreatment fluid quality
AssigneeCummins Inc.
InventorsMark Bays, Thomas A. Grana, Daniel D. Wilheim, Stephen J. Charlton, John Carson Wall
Life of this patent
Estimating the term…
Abstract
A method includes determining a first NOx conversion efficiency (η) value and determining that a diesel exhaust fluid (DEF) level has increased a threshold amount. Further, the method includes determining a second NOx conversion η value and comparing the first NOx conversion η value and the second NOx conversion η value, determining a NOx conversion η change in response to comparing, and determining a DEF quality indicator in response to the NOx conversion η change.
Claims34
A method, comprising:
- determining a first NOx conversion efficiency (η) value;
- determining that a diesel exhaust fluid (DEF) level has increased a threshold amount;
- determining a second NOx conversion η value;
- and
- comparing the first NOx conversion η value and the second NOx conversion η value, determining a NOx conversion η change in response to comparing, and determining a DEF quality indicator in response to the NOx conversion η change.
2 more elements
A system, comprising:
- an internal combustion engine producing an exhaust stream, the exhaust stream including an amount of NOx;
- a NOx conversion catalyst that reduces at least a portion of the amount of NOx;
- a reagent source that stores an amount of a NOx reductant reagent and a reagent injector that receives the NOx reductant reagent from the reagent source and provides the NOx reductant reagent to the exhaust stream at a position upstream of the NOx conversion catalyst;
- at least one NOx sensor operably coupled to the exhaust stream at a position downstream of the NOx conversion catalyst;
- and
- a controller, comprising:
- a NOx conversion efficiency (η) module structured to determine a NOx conversion η value for the NOx conversion catalyst;
- a NOx reductant reagent status module structured to determine one of a NOx reductant reagent level and a NOx reductant reagent fill indicator, and to provide a NOx reductant reagent level increase event indication;
- and
- a NOx reductant reagent quality module structured to compare a first NOx conversion η value stored before the NOx reductant reagent level increase event to a second NOx conversion η value determined after the NOx reductant reagent level increase event, to determine a NOx conversion η change in response to the first NOx conversion η value and the second NOx conversion η value, and to determine a NOx reductant reagent quality indicator in response to the NOx conversion η change.
7 more elements
A method, comprising:
- determining a first parameter value corresponding to a first NOx conversion efficiency (η) value;
- determining that an exhaust treatment fluid level has increased a threshold amount;
- determining a second parameter value corresponding to a second NOx conversion η value;
- and
- comparing the first parameter value and the second parameter value, determining a NOx conversion η change in response to comparing, and determining an exhaust treatment fluid quality indicator in response to the NOx conversion η change.
2 more elements
An apparatus, comprising:
- a NOx conversion efficiency (η) module structured to determine a NOx conversion η value for a NOx conversion catalyst;
- a NOx reductant reagent status module structured to determine one of a NOx reductant reagent level and a NOx reductant reagent fill indicator, and to provide a NOx reductant reagent level increase event indication;
- and
- a NOx reductant reagent quality module structured to compare a first NOx conversion η value stored before the NOx reductant reagent level increase event to a second NOx conversion η value determined after the NOx reductant reagent level increase event, to determine a NOx conversion η change in response to the first NOx conversion η value and the second NOx conversion η value, and to determine a NOx reductant reagent quality indicator in response to the NOx conversion η change.
1 more element
Dependencies are inferred from the claim text.