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Accuracy of A/F Calculation from Exhaust Gas Composition of SI Engines
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Abstract
The accuracy of real-time A/F measurement at engine test benches has been improved with a modified equation to calculate A/F from exhaust gas composition. In addition to CO, CO2, total hydrocarbon (THC) and O2, the proposed equation includes NO and NO2 concentration as variables. In an attempt to improve the accuracy of the assumed constants in the equation, experiments have been conducted using automotive exhaust H2O and H2 analyzers. The accuracy of the proposed equation was proven through experiments and it was also found useful for precise evaluation of three-way catalyst or oxygen sensor characteristics.
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Citation
Fukui, T., Tamura, Y., Omorl, S., and Saitoh, S., "Accuracy of A/F Calculation from Exhaust Gas Composition of SI Engines," SAE Technical Paper 891971, 1989, https://doi.org/10.4271/891971.Also In
References
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