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Measurement of Local Air/Fuel Ratio and Evaluation of Accuracy of Engine Simulation Using Micro-Cassegrain Sensor

Article of Honda R&D Technical Review Vol.21 No.1


The fuel consumption rate of gasoline engines can be decreased by reducing cyclic variation and variations in the combustion state between cylinders, but this necessitates high-precision combustion control. Control of the air-fuel ratio (A/F) in the cylinders, in particular the local A/F near the spark plugs, is an important factor in combustion control. A three-dimensional engine simulation model enabling prediction of the local A/F near the spark plugs was therefore constructed. A micro-Cassegrain sensor able to measure the local A/F near the spark plugs in a real engine was used to evaluate the accuracy of the prediction. The results indicated that the local A/F can be predicted within the range of cyclic variation.


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Author (organization or company)

Shunichi KUBOTA(Automobile R&D Center)、Takafumi KOMORI(Automobile R&D Center)、Yuji YAMAMOTO(Automobile R&D Center)、Shusuke AKAZAKI(Automobile R&D Center)、Yuji IKEDA(Imagineering, Inc.)

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