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Residual Gas Fraction Measurement inside Engine Cylinder Using Infrared Absorption Method with Spark-plug Sensor
Technical Paper
2007-01-1849
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this study, residual gas fraction measurements in a spark-ignition engine were carried out using an optical sensor installed in the spark plug with infrared absorption method. The residual gas fraction inside engine cylinder is proportional to the CO2 concentration. Infrared absorption method was applied and an infrared lamp and optical filter (center wavelength: around 4.3 μm) that coincides with the absorption lines of CO2 was used as a light source.The molar absorption coefficient of CO2 is discussed and compared to results in the HITRAN database. The effect of water vapor absorption doesn't affect the absorption of CO2. The absorption characteristics of CO2 were determined in advance using a constant volume vessel. Molar absorption coefficient depends on the CO2 concentration and ambient pressure and temperature, and wavelength of absorption line. Further experiments should be carried out for the quantitative measurements of CO2 concentration using infrared lamp and band-pass filter. The spark plug sensor for in-situ CO2 concentration measurement was applied to a compression-expansion machine and also to a port injected SI engine. It was possible to qualify the CO2 concentration inside residual gas during the compression stroke using the developed optical system with new spark plug sensor both in compression-expansion machine and commercial spark-ignition engine.
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Citation
Kawahara, N., Tomita, E., and Tanaka, Y., "Residual Gas Fraction Measurement inside Engine Cylinder Using Infrared Absorption Method with Spark-plug Sensor," SAE Technical Paper 2007-01-1849, 2007, https://doi.org/10.4271/2007-01-1849.Also In
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