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Cycle by Cycle Variability in Emissions of a Spark Ignition Engine

1974; Linguagem: Inglês

10.4271/741034

2688-3627

E E Milkins, H. C. Watson, Laurie Goldsworthy, R. J. Hallworth,

Advanced Combustion Engine Technologies

The exhaust emissions from a single-cylinder spark ignition engine were measured as a function of burning time. Tests were carried out at full throttle, for lean, optimum, and rich A/F. The exhaust components measured were CO, HC, 02, H2, 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. A reduction in CBCV would also reduce overall CO and HC emissions, particularly for very lean operation. /GMRL/