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Limits on Charge Dilution, Fuel and Air Proportions for Stable Combustion in Spark Ignition Engines
Technical Paper
2004-01-1533
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Experimental studies have been carried out on homogeneous charge, spark ignition engines running on European pump-grade, 95 RON gasoline. The aim was to determine the limits on dilution and mixture proportions imposed by a deterioration in engine cycle-by-cycle combustion stability. The stable limit was taken as corresponding to a COVimep of 10%. Residual gas fraction was raised through engine load and valve timing changes, and determined by cylinder gas sampling. The results define a bounded region of stable operation on two diagrams, with axes of air/burned gas and fuel/burned gas for the first and burned gas fraction and air/fuel ratio for the second. For stable operation, gas/fuel ratio is limited to around 25:1 and is the constraint on upper limits of dilution and air/fuel ratio. For fuel-rich mixture operation, the limiting value of air/fuel ratio rises from around 9:1 to stoichiometric as burned gas fraction increases. The limiting value of burned gas fraction was less than or around 0.3.
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Shayler, P., Lai, W., Brown, N., and Harbor, N., "Limits on Charge Dilution, Fuel and Air Proportions for Stable Combustion in Spark Ignition Engines," SAE Technical Paper 2004-01-1533, 2004, https://doi.org/10.4271/2004-01-1533.Also In
New Spark Ignition Engine and Component Design, and Spark Ignition Combustion
Number: SP-1828; Published: 2004-03-08
Number: SP-1828; Published: 2004-03-08
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