Investigation of Misfire in a Fast Burn Spark Ignition Engine

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Abstract
A methodology is presented for determining the minimum energy condition for a spark ignition engine for given inlet conditions and ignition system. This is accomplished with a new misfire detection technique which yields good repeatability. The effects of changes in the equivalence ratio, turbulence level, and residual gas fraction are investigated. A simplified thermal ignition model is evaluated at the experimentally determined ignition limits. The model is unable to satisfactorily predict the effect of engine speed changes. The results suggest that the use of a fully developed value for the eddy diffusivity during the ignition process is invalid in spark ignition engines.

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