Method to diagnose SCR catalyst
US9638122B2 · kind B2 · utility
16Cited by
1References
20Claims
0Family size
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Inventors
Key dates
| Filing date | Dec 20, 2013 |
| Grant date | May 2, 2017 |
| Priority date | — |
| Expiry date | Apr 6, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Methods and systems are described for an engine with a SCR system including NOx sensors upstream and downstream of catalyst. One method includes monitoring SCR performance via calculating SCR conversion efficiency at different catalyst temperatures. Further, feedgas NOx levels are artificially increased when SCR device temperature is above a threshold to obtain more reliable readings from NOx sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.