In this study, real-world evaporative emissions testing was performed on 50 late-model vehicles (30 passenger cars and 20 light-duty trucks) ranging in age from 1992 to 1997 model year. Six of the 50 vehicles were equipped with enhanced evaporative emission control systems; 49 were procured from an Arizona State Inpsection and Maintenance (I/M) Program test lane located in Mesa, Arizona; one vehicle was procured from an employee of the test facility. Hot soak, running loss, and real-time diurnal testing was performed using tank fuel that averaged 6.5 RVP. Hot soak and running loss testing was performed at above 95 deg F and one- and three-day diurnal testing was done using heat builds of 72-96 deg F. The data collected indicate that the small percentage of the vehicle fleet with evaporative emission control system defects contributes disproportionately to the total evaporative emissions of the fleet.
Real World Evaporative Testing of Late-Model In-Use Vehicles. Evaporative Emissions from Late-Model In-Use Vehicles
1999
114 pages
Report
Keine Angabe
Englisch
Air Pollution & Control , Road Transportation , Evaporative emission measurement , Air pollution monitoring , Diurnal variations , Gasoline vapors , Fuel tank emissions , Fuel tank evaporation , Hydrocarbons , Vehicle inspection , Vehicle maintenance , Carburetors , Air pollution sampling , Vehicle air pollution , Temperature effects , Fleet management , Certification , Hot soak emissions , Running loss emissions
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