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Pre-evaporated Stratified Injection
Technical Paper
2004-32-0099
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Pre-evaporated Stratified Injection (PSI) is a low-cost mechanical fuel injection system which dramatically reduces exhaust gas emissions in small IC engines. In two-stroke engines, this is achieved by incorporating a mechanically driven coaxial air-fuel injector within the upper half of an engine's main piston. In four stroke engines the injector cylinder is located in the cylinder head with the injector piston driven by the valve cam. In both configurations, the relative motion of the injector piston draws a rich air-fuel mixture from the carburetor, captures and compresses for sufficient time under most operating conditions to substantially evaporate fuel before direct injection into the cylinder.
This technology allows for stratified charge combustion without wall wetting (spray impingement), leading to lower hydrocarbon (HC) and carbon monoxide (CO) emissions in four-stroke engines, and for the first time allowing low cost, small two-stroke engines to meet non-handheld emission standards.
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Citation
Tyree, C., Holger, R., and Dartnall, J., "Pre-evaporated Stratified Injection," SAE Technical Paper 2004-32-0099, 2004, https://doi.org/10.4271/2004-32-0099.Also In
References
- California Environmental Protection Agency Air Resources Board Initial Statement of Reasons for Proposed Rulemaking Public Hearing to Consider the Adoption of Exhaust and Evaporative Emission Control Requirements for Small Off-Road Equipment and Engines Less than or Equal to 19 Kilowatts California 2003
- Heywood, J. B. Sher, E. “The Two-Stroke Cycle Engine: Its Development, Operation, and Design” Taylor & Francis Warrendale, PA 1999
- Nuti M. et al “FAST Injection System: A Very Simple Way to Lean Combustion in SI Engines” SETC Paper, Small Engine Technology Conference 1997
- Stan C “Particulars of Combustion in Direct Injection Spark Ignition Engines” SAE paper 2001-01-0249 3 4