System and method for selective catalytic reduction control
US8596042B2 · kind B2 · utility
9Cited by
5References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2008 |
| Grant date | Dec 3, 2013 |
| Priority date | — |
| Expiry date | Sep 24, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A selective catalytic reduction (SCR) catalyst control system and method for an engine is disclosed. Urea injection to an SCR catalyst is determined based on an SCR catalyst model, which determines a value of stored NH3 in the SCR catalyst based on the NOx engine emission value, the SCR catalyst temperature, the quantity of urea supplied to the SCR catalyst and a pre-determined efficiency of conversion of NOx gases. A target value of stored NH3 and the value of stored NH3 in the SCR catalyst is then used to determine a stored NH3 differential, which is then used to calculate urea injection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.