Record Display for the EPA National Library Catalog


Main Title A track to twin roll dynamometer comparison of several different methods of vehicle velocity simulation /
Author Yurko, John.
CORP Author Environmental Protection Agency, Ann Arbor, MI. Standards Development and Support Branch.
Publisher U.S. Environmental Protection Agency, Office of Air, Noise and Radiation, Office of Mobile Source Air Pollution Control, Emission Control Technology Division, Standards Development and Support Branch,
Year Published 1979
Report Number EPA AA-SDSB-79-26
Stock Number PB80-129141
OCLC Number 724600156
Subjects Dynamometers ; Vehicle Test Driving Schedules ; Vehicle Performance ; Velocity/ Speed ; Vehicle Miles Traveled
Additional Subjects Motor vehicles ; Dynamometers ; Fuel consumption ; Exhaust emissions ; Road tests ; Couplings ; Velocity ;
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
ELBD ARCHIVE EPA AA-SDSB-79-26 AWBERC Library/Cincinnati,OH 03/20/2024
ELCD  EPA AA-SDSB-79-26 NVFEL Library/Ann Arbor, MI 05/23/2011 DISPERSAL
NTIS  PB80-129141 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 24 pages : charts ; 28 cm
The current EPA test procedure for fuel economy and emissions testing uses a twin roll dynamometer obtaining a speed signal from the rear roll and simulating the forces at the front roll. With the rolls coupled only by the drive wheels of the vehicle, the front roll travels approximately 2% slower than the rear roll at steady-state 50 mph, resulting in approximately a 4% overprediction of fuel economy. Coupling the rolls externally equalizes the roll speeds at a value which better simulates the road velocity and therefore better predicts the fuel economy. This report describes the test program and data analysis which led to these conclusions.
Includes bibliographical references (page 13). Technical report. Cover title. "EPA-AA-SDSB 79-26." "June 1979."