2014 Volume 5 Issue 1 Pages 142-147
This study focuses on the characteristics of polycyclic aromatic hydrocarbons (PAHs) and fine particulate matter (PM) in six four-stroke motorcycle exhaust emissions. Blend gasoline contains 85% (vol) ethanol (Gasohol E85) and 10% (vol) ethanol (gasohol 91) was used as test fuels. The test motorcycle was driven on a Chassis dynamometer to evaluate the effect of ethanol-gasoline blend on gaseous pollutant emissions. The dynamometer system comprised a cooling fan, a dynamometer, a dilution tunnel, a constant-volume sampler (CVS) unit, a gas analyzer and a personal computer. The exhaust from the test motorcycle was passed to the dilution tunnel. The emissions of PAHs and criteria air pollutants (THC, CO, and NOx) were measured. Measurements were performed on a standard driving cycle. The results show that in comparison to gasohol 91 fuels, the use Gasohol E85 fuels achieved reduction of THC and CO emissions. The emission of THC from gasohol E85 reduced by 4-60% (average 43%) compared with those of gasohol 91 fuels. CO emissions also showed a reduction by 40-95% (average 75%). The concentrations of naphthalene, Benzo(a)anthracene, Chrysene, Benzo(b)fluoranthene, and Benzo(g, h, i)perylene were also determined.
