Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Emission modeling and sensitivity study /
Author Thacker, J. C. ; Smalley, W. M.
Other Authors
Author Title of a Work
Smalley, W. M.
CORP Author Aerospace Corp., El Segundo, CA.;Environmental Protection Agency, Ann Arbor, MI. Motor Vehicle Emission Lab.
Publisher Environmental Protection Agency, Office of Air and Waste Management, Office of Mobile Source Air Pollution Control, Emission Control Technology Division,
Year Published 1979
Report Number EPA 460/3-79-005; ATR-79(7623-04)-1; EPA-68-03-2482
Stock Number PB81-152001
OCLC Number 755011920
Subjects Automobiles--Motors--Exhaust gas--Mathematical models. ; Automobiles--Fuel consumption--Mathematical models. ; VEHSIM (Computer program)
Additional Subjects Automobiles ; Exhaust emissions ; Fuel economy ; Air pollution control equipment ; Catalytic converters ; Performance evaluation ; Computerized simulation ; Honda automobiles ; Buick automobiles ; Chevrolet automobiles ; VEHSIM computer program
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ELCD  EPA 460-3-79-005 NVFEL Library/Ann Arbor, MI 10/03/2011
NTIS  PB81-152001 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 1 v. (various pagings) : ill., charts ; 28 cm.
This report presents the results of a three part study involving (1) the enhancement of EPA's VEHSIM vehicle simulation computer program for studying vehicle emission effects, (2) the application of this program to the determination of vehicle fuel economy and emission responses to variation in driving cycles, vehicle weight, acceleration rates, and emission control constraints, and (3) the reduction of EPA-furnished raw data on transient and temperature effects on emissions. The VEHSIM vehicle simulation computer program was modified to perform simultaneous computations of fuel economy and emission factors for HC, CO and NOx. The weight sensitivity analysis showed that the effect of increasing weight in three different vehicles decreased fuel economy, produced mixed results for HC emissions, and generally increased CO and NOx emissions. Increasing driving cycle acceleration/deceleration rates was found generally to decrease fuel economy and to increase emission rates. Driving cycle simulation using two sets of emission control logic developed by DOT to optimize EPA 55/45 fuel economy were found to improve fuel economy, but to increase HC and NOx under higher speed driving conditions compared to the LA-4 which was the emissions basis for the control logic development.
"EPA 460/3-79-005." "Contract No. 68-03-2482"--T.p. "EPA Project Officer: J. Dillard Murrell"--T.p. "May 1979"--T.p. "April 1979"--Cover. Includes bibliographical references.