Patent · US Active

LNT regeneration strategy to reduce NOx spike

US7810315B2 · kind B2 · utility

5Cited by
20References
15Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 20, 2007
Grant dateOct 12, 2010
Priority date—
Expiry dateFeb 8, 2029

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY02T10/12
  • WIPO fieldEnvironmental technology
  • WIPO sectorChemistry

Abstract

Systems and methods are disclosed for ameliorating NOx slip from a lean NOx trap by reducing the amount of hydrocarbons reaching the lean NOx trap during the early stages of, or in a period immediately preceding, a rich regeneration. In one embodiment, a hydrocarbon absorber is configured downstream from a fuel reformer, but upstream from the lean NOx trap, in order to reduce the quantity of hydrocarbons that reach the lean NOx trap during lean reformer warm-up and rich regeneration phases. In another embodiment, the fueling rate to a fuel reformer configured in an exhaust line upstream from the lean NOx trap is limited to reduce NOx slip.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.