This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effects of Ambient Conditions on the Emissions of a Small Carbureted Four-Stroke Engine
Annotation ability available
Sector:
Language:
English
Abstract
The exhaust-gas emissions of a small four-stroke, carbureted, single-cylinder spark-ignition engine have been studied as functions of ambient conditions, using gasoline as the fuel. In steady-state dynamometer tests at fixed engine speeds/loads, carried out under different climatic conditions, the concentrations of exhaust-gas components have been measured. Their dependence on ambient conditions has been analyzed principally in terms of the influence of ambient temperature, pressure, and humidity on the air-fuel ratio metered by the carburetor. While the air-fuel ratio of carbureted utility engines at fixed loads varies by only a small percentage during modest changes in ambient air conditions, these changes can correspond to significant changes in the production of regulated pollutants. Using a correction for air mass flow and fuel density at wide open throttle, the scatter in observed air-fuel ratio and % CO data could be reduced by about one third.
Recommended Content
Authors
Citation
Brereton, G., DeAraujo, A., and Bertrand, E., "Effects of Ambient Conditions on the Emissions of a Small Carbureted Four-Stroke Engine," SAE Technical Paper 961739, 1996, https://doi.org/10.4271/961739.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
- Automotive Engine Test Code General Motors Corporation Seventh 1994
- Brown, W. J. et al “Effect of engine intake-air moisture on exhaust emissions,” SAE Paper No. 700107 1970
- “Test procedure for the measurement of gaseous exhaust emissions from small utility engines,” SAE J1088 Recommended Practice 1983
- Code of Federal Regulations 40 CFR Parts 86 to 099 Office of the Federal Register National Archives and Records Administration Washington, DC 1992
- Spindt R. S. “Air-fuel ratios from exhaust gas analysis,” SAE Paper No. 650507 1965
- Press W. H. Flannery B. P. Flannery S. A. Vetterling W. T. “The art of scientific computing,” Cambridge University Press 539 546 1986
- Hey-wood J. B. “Internal combustion engine fundamentals,” McGraw-Hill 284 290 1988
- Maxwell J. B. “Data book on hydrocarbons,” Van Nos-trand Inc. 143 1950