Development of Spark-Plug Sensor System for Fuel/ Residual Gas Concentration

By: Nobuyuki Kawahara

28 February 2011


Cycle-resolved measurements of the fuel/ residual gas concentration near a spark plug in a practical sparkignition (SI) engine have been developed. An in situ laser infrared (IR) absorption method was applied using a spark plug sensor and a 3.392-μm He-Ne laser or an infrared lamp as the light source. The newly developed IR spark plug sensor had a higher signal-to-noise ratio than its previous version due to the optimization of its sapphire lens and two optical fibers. Mixture formation process near the spark-plug and relationship between fuel concentration and combustion characteristics could be investigated in Wankel rotary engine, and high boost diesel engine using developed IR sensor system.

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