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Developing Best Available Technology in a Flex-Fuel Snowmobile by Using a Lean-Burn Miller Cycle
Published October 15, 2013 by Society of Automotive Engineers of Japan in Japan
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Clean snowmobile technology has been developed and applied to a commercially available two cylinder, four-stroke snowmobile. The goals of this effort included reducing exhaust and noise emissions to levels below the U.S National Parks Service (NPS) Best Available Technology (BAT) standard while increasing vehicle dynamic performance with a 50 percent peak power increase over the original equipment version.
Engine thermal efficiency has been increased through Late Intake Valve Closure (LIVC) valve timing modification for Miller cycle operation, while high load power was increased through the implementation of a turbocharger and variable electronic boost control. An electronic throttle was also implemented in combination with a “performance/economy” mode switch to limit speed and increase fuel efficiency per the rider's demands. Additionally, a new exhaust system featuring a three-way catalytic converter and a simple, lightweight muffler utilizing a passive acoustic valve has been developed to reduce chemical and noise emissions. This snowmobile was modified to run the full range of ethanol-blended fuels using an affordable flex-fuel sensor and custom controls, including closed-loop wideband exhaust oxygen feedback. Excellent fuel efficiency was achieved with the lean-burn Miller cycle powertrain in addition to an exhaust emissions improvement of 13 percent from the original equipment version.
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CitationBirt, M. and Davis, G., "Developing Best Available Technology in a Flex-Fuel Snowmobile by Using a Lean-Burn Miller Cycle," SAE Technical Paper 2013-32-9176, 2013, https://doi.org/10.4271/2013-32-9176.
- SAE International http://www.sae.org/domains/students/competitions/snowmobile/rules/2013rules-ze.pdf
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- Davis , G. W. “Using E85 in Vehicles,” Chapter 8 Alcoholic Fuels CRC Press Minteer , S. Final Submission 2005
- Heywood , J. , Kasseris , E. Charge Cooling Effects on Knock Limits in SI DI Engines Using Gasoline/Ethanol Blends: Part 1-Quantifying Charge Cooling SAE paper 2012-01-1275 2012
- Miklanek , L. , Vitek , O. , Gotfryd , O. , and Klir , V. Study of Unconventional Cycles (Atkinson and Miller) with Mixture Heating as a Means for the Fuel Economy Improvement of a Throttled SI Engine at Part Load SAE Int. J. Engines 5 4 1624 1636 2012 10.4271/2012-01-1678
- Attard , W. , Watson H.C. Development of a 430cc Constant Power Engine for FSAE Competition SAE paper 2006-01-0745 2006