In-house test program report No. 2: vehicle preconditioning LA-4 vs. HFET. Technical support report
The purpose of this study was to determine whether or not the two Highway fuel economy test (HFET) cycles used for measuring fuel economy would be suitable for a preconditioning driving cycle in place of one urban dynamometer driving schedule (LA-4). The main concern with using the HFET was the possibility that the purge characteristics of the evaporative emission control system would allow for purging during preconditioning and not during the exhaust emission cycle which is essentially the same as an LA-4. If this were to occur then sufficient canister capacity would enable a vehicle to pass the evaporative emissions test, and the exhaust test would be easier to pass due to the fact that hydrocarbons from the canister would not be purging into the engine.
- Research Organization:
- Environmental Protection Agency, Ann Arbor, MI (USA)
- OSTI ID:
- 5223861
- Report Number(s):
- PB-270365; EVAP-75-5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330100* -- Internal Combustion Engines
330700 -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
AUTOMOBILES
DYNAMOMETERS
EVAPORATION
EXHAUST GASES
FUEL ECONOMY
GASEOUS WASTES
HYDROCARBONS
MEASURING INSTRUMENTS
MEASURING METHODS
ORGANIC COMPOUNDS
PERFORMANCE
PHASE TRANSFORMATIONS
POLLUTION CONTROL
TEST FACILITIES
VEHICLES
WASTES