A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine

2010-01-0618

04/12/2010

Event
SAE 2010 World Congress & Exhibition
Authors Abstract
Content
This work involved study of the effects of alcohol blends on combustion, fuel economy and emissions in a single cylinder research engine equipped with a mechanical fully variable valvetrain on the inlet and variable valve timing on the exhaust. A number of splash blends of gasoline, iso-octane, ethanol and butanol were examined during port fuel injected early inlet valve closing operation, both with and without variable valve timing. Under low valve overlap conditions, it was apparent that the inlet valve durations/lifts required for full unthrottled operation were remarkably similar for the wide range of blends studied. However, with high valve overlap differences in burning velocities and internal EGR tolerances warranted changes in these valve settings. In turn, it was concluded that high ethanol content blends facilitated minimum throttling at the inlet valve itself and the largest relative savings in terms of fuel consumption, engine-out emissions of NOx and (corrected) unburned hydrocarbons.
Meta TagsDetails
DOI
https://doi.org/10.4271/2010-01-0618
Pages
17
Citation
Cairns, A., Todd, A., Aleiferis, P., Fraser, N. et al., "A Study of Alcohol Blended Fuels in an Unthrottled Single Cylinder Spark Ignition Engine," SAE Technical Paper 2010-01-0618, 2010, https://doi.org/10.4271/2010-01-0618.
Additional Details
Publisher
Published
Apr 12, 2010
Product Code
2010-01-0618
Content Type
Technical Paper
Language
English