Main Title |
Development of an Improved Computer Simulation Vehicle Emissions During Cold Start and Warm-Up Operation. |
CORP Author |
Sierra Research, Inc., Sacramento, CA.; Environmental Protection Agency, Ann Arbor, MI. Office of Mobile Sources. |
Year Published |
1991 |
Report Number |
SR91-09-02 |
Stock Number |
PB2014-107394 |
Additional Subjects |
Motor vehicle engines ;
Exhaust emissions ;
Cold starting ;
Algorithms ;
Catalysts ;
Combustion ;
Computerized simulation ;
Correction factors ;
Exhaust gases ;
Fuel consumption ;
Warm-up
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB2014-107394 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
24p |
Abstract |
Based on an analysis of model emissions data from vehicles tested by EPA, an algorithm has been developed to simulate cold start and warm-up operation using a vehicle emissions simulation model called VEHSIME. During the first 450 seconds of operation following a cold start, the algorithm applies correction factors to the emission rates in 'map' of emission rates over the full speed and load range of a warmed-up engines. The correction factor increases 'engine-out' HC and CO emissions in proportion to the number of seconds left in the warm-up period. The algorithm also applies a catalyst efficiency factor to the map of engine-out emissions as soon as the fuel consumption since start up reaches the cumulative fuel consumption associated with the catalyst reaching 'light-off' temperature on the LA4 cycle. |