A study of the impact of extended purge on evaporative emissions
Six in-use vehicles designed to meet the federal two gram evaporative emission standard were tested to determine the effect of extended pruging on their evaporative emission control canisters. These six vehicles, previously tested in other programs, either failed to meet the two gram evaporative emission standard or had high evaporative emissions when tested using an 11.7 RVP (Reid vapor pressure) gasoline after each vehicle's evaporative emission control system was restored to manufacturer's specifications. Following an extended purge by driving each vehicle on public highways at average speeds of 50 mph, evaporative emissions were measured using the standard evaporative emission test fuel (9 psi RVP Indolene) and the 11.7 psi RVP fuel. Canister weights were recorded throughout the program. At the end of the program, the purge characteristics (purge start time and temperature, purge flow rate, and total purge) for each vehicle was determined. Compared to the emissions measured using normal evaporative emissions test procedures, the extended purge reduced canister weights (removed adsorbed fuel vapors) and reduced evaporative emissions from the 9 psi RVP fuel. However, on average, the extended purge did not reduce evaporative emissions from the 11.7 psi RVP fuel.
- OSTI ID:
- 7224274
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330700* -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
AUTOMOTIVE FUELS
CONTROL
EMISSION
EQUIPMENT
EVAPORATION
FLUIDS
FUELS
GASES
GASOLINE
LIQUID FUELS
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SAFETY STANDARDS
STANDARDS
VAPORS
VEHICLES