Method for minimizing ammonia slip from SCR catalysts
Patents
Language: |
Английский |
Type: |
Invention |
Number |
US 8820050 B2 |
Request number: |
13/523,054 |
Request date: |
Jun 14, 2012 |
patent.field.start_date: |
|
Registration date: |
Sep 2, 2014 |
patent.field.request_publication_date: |
|
Authors |
Dubkov A.A.
,
Balenovic M.
,
Harmsen J.
,
Ukropec R.
,
Carberry B.P.
|
Affiliations |
1 |
Ford Global Technologies, LLC, Dearbom, MI (US)
|
|
Embodiments for reducing ammonia slip are provided. In one example, a method for reduction of ammonia emissions from an engine exhaust gas aftertreatment device with an SCR catalyst comprises determining a concentration of NOx and/or ammonia in the exhaust gas aftertreatment device, comparing a determined value of NOx and/or ammonia concentration with a nominal value for NOx and ammonia, respectively, and if an actual or shortly forecasted ammonia concentration is above the respective nominal value, triggering engine conditions with higher exhaust NOx concentration. In this way, ammonia slip may be reduced without degrading fuel economy.