Accuracy of A/F calculation from Exhaust Gas Composition of SI Engines

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 im...

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Bibliographic Details
Published in:SAE transactions 1989-01, Vol.98 (4), p.656-666
Main Authors: Fukui, Toyoaki, Tamura, Yasuki, Omori, Shogo, Saltoh, Shinichiroh
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Engines and turbines
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Online Access:Get full text
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Summary: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.
ISSN:0096-736X
2577-1531