NOx-flowrate and temperature correction during soot mass estimation in a vehicle exhaust after-treatment device
US9140156B2 · kind B2 · utility
2Cited by
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10Claims
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Key dates
| Filing date | Aug 1, 2012 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | May 11, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of correcting a soot mass estimate in a vehicle exhaust after-treatment device includes monitoring an exhaust gas pressure drop across a particulate filter included with the vehicle exhaust after-treatment device; determining an initial soot mass estimate from a monitored exhaust gas pressure drop; revising the initial soot mass estimate in view of a monitored engine speed, engine load, exhaust gas temperature, and NOx gas flow rate; and generating a particulate filter regeneration request if the revised soot mass estimate exceeds a threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.