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原文传递 University of Idaho's Clean Snowmobile Design Using a Direct-Injection Two-Stroke Engine. 2007.

题名：	University of Idaho's Clean Snowmobile Design Using a Direct-Injection Two-Stroke Engine. 2007.
作者：	findlay, a. hanks, b. harker, n. johnson, j. tockey, c.
关键词：	exhaust emissions,snow mobiles,recreational vehicles,snowmobiles/air pollution control, design, catalysts, fuel injection systems, diesel engines, two-stroke engines, fuel consumption, chassis, environmental impact, modifications/university of idaho
摘要：	The University of Idaho's entry into the 2007 SAE Clean Snowmobile Challenge was a third-generation gasoline direct-injection (GDI) two-stroke powered snowmobile. The modulated and battery-less direct-injection system used to decrease exhaust emissions and improve fuel economy did not reduce the power output of the engine. The emissions output was reduced by using a reduction catalyst located in the exhaust silencer. Noise from the engine compartment was reduced by using sound absorbing materials and a sealed hood. During pre-competition testing, the snowmobile weighed 550 lbs (250 kg) wet, achieving 20 mpg (8.5 km/L) on lightly groomed trails with a pre-catalyst EPA five-mode emissions score of 158, and a J192 sound magnitude score of 80 dBA. The team achieved First Place in the 2007 competition as well as Best Fuel Economy, Best Handling, Best Design, Best Value, Best Ride, Best Design Paper and Best Oral Presentation. The 2007 UI snowmobile averaged 19.6 miles per gallon in fuel economy, maintained stock power, was the lightest snowmobile, exceeded 2012 snowmobile emissions standards with an EPA five-mode emissions score of 177 and achieved National Park Service sound reduction requirements for park admission with a J192 sound magnitude of 73 dBA. / NOTE: Final Rept. (Aug 2006-Sep 2007). / Supplementary Notes: See report for 2006, PB2006-104415. Sponsored by Department of Transportation, Washington, DC. Office of Research and Special Programs. / Availability Note: Product reproduced from digital image. Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5285 Port Royal Road, Springfield, VA, 22161, USA.
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