This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Challenges of Applying Catalytic Aftertreatment to Small Utility Engines
Annotation ability available
Sector:
Language:
English
Abstract
Regulations are being considered or have already been enacted to limit the exhaust emissions of hydrocarbons, CO and NOx from small engines, such as those used in the lawn and garden industry. One of the most promising ways for engine manufacturers to comply with current and future emission standards is through the use of catalysts. However, these small engines provide an environment with a number of challenges for emission catalyst activity and durability which are not found with automotive exhaust, which is traditionally where catalysts of this type have been used. Problems unique to the small engine can include extremely short catalyst residence times, high hydrocarbon and carbon monoxide to oxygen ratios, overall high levels of emissions leading to high reaction exotherms, and pertubated flow due to single cylinder operation. A number of catalyst variables were tested using 4-stroke engines. This paper will describe how some of these issues can affect catalyst performance and recommend directions to optimize emissions reductions.
Recommended Content
Technical Paper | Small Utility Engine Emissions Reduction Using Automotive Technology |
Technical Paper | Development of Future Low Emission Engine Oils |
Technical Paper | Assessing Reductant Chemistry During In-Cylinder Regeneration of Diesel Lean NOx Traps |
Topic
Citation
Silver, R. and Howitt, J., "The Challenges of Applying Catalytic Aftertreatment to Small Utility Engines," SAE Technical Paper 961735, 1996, https://doi.org/10.4271/961735.Also In
Design, Modeling, and Emission Control for Small Two- and Four-Stroke Engines
Number: SP-1195; Published: 1996-08-01
Number: SP-1195; Published: 1996-08-01
References
- Weaver, C Turner, S Chan, L “Feasibility of Utilizing Alternative Fuels and Battery Electric Technology in Commercial Lawn and Garden Utility Engines”
- Sun, X Brereton Morrison G Patterson K D Univ of Mich “Small Engine Emissions” Off High Way Engineering December 1995
- Mooney, J et al SAE 941807 “Exhaust Emission Control of Small 4-stroke Air Cooled Utility Engines An Initial R & D Report
- State of California Air Resources Board Report” Utility Engine Regulation Status Report” December 8 1995
- Hoehm, C “Putting The Brakes On Power Equipment” Lawn and Landscape Maintenance July 1995
- “Greener Pastures” Popular Science July 1992