| 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. |
| Supplementary Notes |
Sponsored by Environmental Protection Agency, Ann Arbor, MI. Office of Mobile Sources. |
| Availability Notes |
Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA. |
| PUB Date Free Form |
30 Sep 1991 |
| Category Codes |
85H; 81A; 81J; 97K; 97R |
| NTIS Prices |
PC A03 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
129400120 |
| Origin |
NTIS |
| Type |
CAT |
