Robust design of diagnostic enabling conditions for SCR NOx conversion efficiency monitor
US8091416B2 · kind B2 · utility
45Cited by
1References
37Claims
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Key dates
| Filing date | Jan 16, 2009 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Aug 2, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method for controlling a malfunction catalyst diagnostic test that determines a malfunction status of a catalyst within a selective catalytic reduction device includes monitoring an exhaust gas flow within an aftertreatment system, estimating an effect of the exhaust gas flow on an estimated reductant storage on a catalyst within the selective catalytic reduction device, and selectively disabling the malfunction catalyst diagnostic test based upon the estimating the effect of the exhaust gas flow on the estimated reductant storage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.