Method and apparatus for monitoring a urea injection system in an exhaust aftertreatment system
US7610750B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2006 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Jul 25, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A monitoring system for an exhaust aftertreatment system is provided, comprising an injecting device operable to inject reductant into an exhaust gas feedstream upstream of a selective catalyst reduction device. The monitoring system comprises a control module, adapted to selectively intrusively control a rate of dosing from the injecting device and, monitor inputs from a sensing device. The sensing device can comprise an ammonia sensor, and, alternatively, a NOx sensor. The control module is adapted to discontinue the rate of dosing, and substantially increase and decrease the rate of dosing for a predetermined amount of time, and to identify a fault in the sensing device and the selective catalyst reduction device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.