Effects of Combustion-Chamber Surface Temperature on the Exhaust Emissions of a Single-Cylinder Spark-Ignition Engine 780642

The effect of combustion-chamber surface temperature on exhaust emissions was investigated for wide ranges of air-fuel ratio, speed and volumetric efficiency. Oxides of nitrogen (NOx) emissions significantly increase with increasing surface temperature. This effect is strongest at lean air-fuel ratios. In rich mixtures, the demonstrated weak influence of surface temperature on NOx emissions is attributed to NO decomposition reactions occurring during the expansion stroke. With the exception of the extremely lean condition (22.5 air-fuel ratio) the sensitivity of hydrocarbon (HC) emissions to surface temperature was found to be essentially independent of air-fuel ratio. No significant effect of surface temperature on carbon monoxide (CO) emissions was found.


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