The seasonal impact of blending oxygenated organics with gasoline on motor vehicle tailpipe and evaporative emissions. Part 2
Evaporative and tailpipe emissions from a 1987 GM Corsica with adaptive learning closed loop control were measured with six fuels and four temperatures. Measured emissions were total (THC) and speciated hydrocarbons, aldehydes, ethanol, MTBE, benzene, 1,3,-butadiene, Co, and NO{sub x}. Tests were also performed to determine the effect of air conditioning (AC) and oxygen sensor failure. In general, AC reduced Highway Fuel Economy emissions, increased FTP emissions, and reduced fuel economy for both test cycles. Oxygen sensor malfunction increased tailpipe emissions and fuel economy. Higher levels of regulated tailpipe emissions were generally produced at the low test temperature. None of the fuels tested appeared to offer a consistent reduction in tailpipe THC and CO emissions under the conditions tested. This paper is the second in a series describing the effects of oxygenated fuels on the evaporative and tailpipe emissions from current technology light-duty gasoline powered motor vehicles. The study resulted from recent considerations by the United States Environmental Protection Agency (EPA) concerning the benefits of blending certain oxygenated compounds (alcohols and ethers) at specified levels with gasoline to be used as a vehicle fuel. This action was taken because these gasoline blends should provide the following benefits: Oxygenation can enhance fuel octane rating and thus compensate for the elimination of lead, and octane booster; the presence of oxygen in the field should reduce tailpipe emissions of total hydrocarbons and carbon monoxide; the addition of these oxygenated compounds will extend the present fuel supply and therefore could reduce oil imports; and surplus grain crops can be turned into ethanol, which can be used directly in fuel blends or reacted with isobutylene to form ethyl tertiary butyl ether.
- OSTI ID:
- 5935673
- Report Number(s):
- CONF-9010205-
- Resource Relation:
- Conference: 1990 Society of Automotive Engineers (SAE) international fuels and lubricants conference and exposition, Tulsa, OK (United States), 22-25 Oct 1990; Other Information: Technical Paper SAE 902129
- Country of Publication:
- United States
- Language:
- English
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