Urea deposit detection for use with SCR emissions control system
US10161283B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2017 |
| Grant date | Dec 25, 2018 |
| Priority date | — |
| Expiry date | May 16, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of detecting urea-derived deposits in the exhaust line of an internal combustion engine having an SCR (selective catalyst reduction) aftertreatment system. A radio frequency (RF) transmitter is placed upstream of the SCR system's urea injector, and an RF receiver is placed downstream of the mixer. The transmitter and receiver are used to acquire baseline RF data representing a clean condition exhaust line without deposits. During subsequent operation of the engine, the transmitter and receiver are used to acquire subsequent RF data, which is compared to the baseline data after being corrected for temperature differences. If the comparison indicates the presence of one or more deposits, an alert signal is generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.