Exhaust gas control apparatus for internal combustion engine
US9593611B2 · kind B2 · utility
5Cited by
0References
7Claims
0Family size
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Key dates
| Filing date | Oct 28, 2013 |
| Grant date | Mar 14, 2017 |
| Priority date | — |
| Expiry date | Feb 24, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
It is possible to decrease the amount of NOx emitted into the air. The amount of ammonia adsorbed on an SCR catalyst is calculated by subtracting the amount of ammonium nitrate produced on the SCR catalyst from the amount of ammonia adsorbed on the SCR catalyst at the time of starting of an internal combustion engine, and the amount of NO2 flowing into the SCR catalyst is decreased when an NOx purification rate estimated from the amount of ammonia adsorbed on the SCR catalyst is less than a threshold value compared to when the NOx purification rate is equal to or greater than the threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.