Method and apparatus for estimating oxygen storage capacity and stored NOx in a lean NOx trap (LNT)
US6826902B2 · kind B2 · utility
11Cited by
11References
8Claims
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Key dates
| Filing date | Mar 18, 2003 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Mar 18, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for predicting oxygen capacity of an LNT during storage phase of such LNT and the amount of NOx stored in the LNT during purge phase thereof as a function of the time history of an output signal produced by an exhaust gas sensor disposed downstream of the LNT. Oxygen storage capacity of the (LNT) is estimated by integrating output signal over time to determine the amount of oxygen stored in the LNT as function of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.