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Evaluation of Durable Emission Controls for Large Nonroad SI Engines
Technical Paper
2002-01-1752
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The Environmental Protection Agency (EPA) is developing emission standards for nonroad spark-ignition engines rated over 19 kW. Existing emission standards adopted by the California Air Resources Board for these engines were derived from emission testing with new engines, with an approximate adjustment applied to take deterioration into account. This paper describes subsequent testing with two LPG-fueled engines that had accumulated several thousand hours of operation with closed-loop control and three-way catalysts. These engines were removed from forklift trucks for characterization and optimization of emission levels. Emissions were measured over a wide range of steady-state points and several transient duty cycles. Optimized emission levels from the aged systems were generally below 1.5 g/hp-hr THC+NOx and 10 g/hp-hr CO.
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Ulmet, V., White, J., Stout, A., and Salardino, D., "Evaluation of Durable Emission Controls for Large Nonroad SI Engines," SAE Technical Paper 2002-01-1752, 2002, https://doi.org/10.4271/2002-01-1752.Also In
References
- White, J.J. et al “Three-Way Catalyst Technology for Off-road Equipment Powered by Gasoline and LPG Engines,” SwRI Final Report April 1999
- Ulmet, Vlad “Evaluation of Emissions Durability of Off-Road LPG Engines Equipped with Three-Way Catalyst,” SwRI Final Report (SwRI 08.3661 & 08.03377) September 2001
- Ulmet, V. White, J.J. Stout, A. Salardino, D. “Development of a Transient Duty Cycle for Large Nonroad SI Engines,” SAE Paper 2002-01-1716 April 2002
- October 5 2001