Excess NH3 storage control for SCR catalysts
US7707824B2 · kind B2 · utility
19Cited by
1References
22Claims
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Key dates
| Filing date | Apr 10, 2007 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Nov 22, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of regulating an amount of NH3 stored in a catalyst of an exhaust after-treatment system includes determining a mass of NH3 into the catalyst based on a dosing rate of a dosing agent that is injected into an exhaust stream upstream of the catalyst and determining a mass of NH3 out of the catalyst. An accumulated mass of NH3 within the catalyst is calculated based on the mass of NH3 into the catalyst and the mass of NH3 out of the catalyst. The dosing rate is regulated based on the accumulated mass of NH3 within the catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.