Spark Spectroscopy for Spark Ignition Engine Diagnostics
Copyright policy )Spark Spectroscopy for Spark Ignition Engine Diagnostics
<div class="htmlview paragraph">The light emissions from a spark discharge were observed by inserting a fibre optic cable through the centre electrode of a spark plug, to investigate the possibility of determining the fuel-air ratio in the spark gap at ignition with spectroscopy.</div> <div class="htmlview paragraph">The total broadband light emission from the spark and the light emission centred at 385 nm from the cyanogen radical (chemical formula CN), were observed for varied ϕ and residual gas concentrations. Additionally, the spark breakdown voltage, V<sub>s</sub>, was monitored for the experiments. All light emissions were observed to be dependent on V<sub>s</sub>, which is influenced by mixture composition, temperature and pressure. With a spark gap size of 0.7 mm, the CN emission shows promise for evaluation of the cyclical variation of ϕ for 0.9 < ϕ <1.1.</div>
- University of Toronto Canada
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