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Cycle by Cycle Variability in Emissions of a Spark Ignition Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1974 by SAE International in United States
Annotation ability available
The exhaust emissions from a single-cylinder spark ignition engine were measured as a function of burning time. Flame propagation time was measured with an ionization probe, and the exhaust gas was sampled with a gas sampling valve. Electronic control logic determined the cycles to be sampled, based on the flame propagation time. Tests were carried out at full throttle, for lean, optimum, and rich A/F. The exhaust components measured were CO, HC, O2, H2, and N2 using a gas chromatograph.
The emission most affected by CBCV is CO. Cycles that are either faster or slower than the mean cycle have increased CO, particularly at lean A/F where a five-fold difference in CO concentration was measured. HC emissions show a 150% change for the same conditions. For other than lean A/F operation, H2 was an exhaust product, up to 6% at rich A/F operation.
It is well established that reductions in CBCV would improve efficiency and power output. Here it is established that a reduction in CBCV would also reduce overall CO and HC emissions, particularly for very lean operation.
CitationMilkins, E., Watson, H., Goldsworthy, L., and Hallworth, R., "Cycle by Cycle Variability in Emissions of a Spark Ignition Engine," SAE Technical Paper 741034, 1974, https://doi.org/10.4271/741034.
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