||In-house test program report No. 1 : vehicle preconditioning: AMA+LA-4 vs LA-4.
Rarick, Thomas ;
Wilson., Gary M. ;
||Environmental Protection Agency, Ann Arbor, Mich. Standards Development and Support Branch.
|| U.S. Environmental Protection Agency, Office of Air and Waste Management, Office of Mobile Source Air Pollution Control, Emission Control Technology Division, Standards Development and Support Branch,
Automobile industry and trade--Environmental aspects ;
Automobile industry and trade--United States ;
Automobiles--Motors--Exhaust gas--Analysis ;
Air--Pollution--United States ;
Exhaust emissions ;
Motor vehicles ;
Dynamic tests ;
Exhaust gases ;
Air pollution ;
Road tests ;
Automobile engines ;
Fuel tanks ;
Test vehicles ;
||EPA Evap. 75-1
||NVFEL Library/Ann Arbor, MI
||Some EPA libraries have a fiche copy filed under the call number shown.
||[i], 17,  p. : ill., charts ; 28 cm.
The purpose of vehicle preconditioning is to provide a relatively consistent starting base for all vehicles involved in emission testing. This starting base is intended to prepare the vehicle so that it tends to simulate a real-life condition that an average vehicle would normally experience in its day-to-day operation. Five vehicles, representing different engine-fuel tank configurations, were used in evaluating the effect of two vehicle preconditioning driving sequences on diurnal losses (as measured by the SHED technique) and exhaust emissions. One prep cycle was that required by the 1975 FTP, consisting of driving the vehicle over a pre-established road route followed by a dynamometer drive. The other prep cycle consisted of a dynamometer cycle only. Three tests per sequence per vehicle were conducted. The results of this testing support an earlier EPA study with regard to exhaust emissions.
Cover title. "June 1975." At head of title: Technical Support Report for Regulatory Action. Includes bibliographical references (p. 15).