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Application of Air Fuel Ratio Control to a Motorcycle with Dual Oxygen Sensor
Technical Paper
2011-32-0629
ISSN: 0148-7191, e-ISSN: 2688-3627
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Abstract
At the upstream part of the Three-Way Catalyst (TWC) an O₂ sensor (UpO₂S) is used for O₂ Feedback Control (O₂F/B) that controls the air-fuel ratio (A/F) close to the stoichiometric level. O₂ sensor has a bit of individual characteristic difference as for the switching the excess air ratios of output (λ shift). This phenomenon becomes remarkable according to the effects of unburnt elements in exhaust gas. Despite the O₂F/B implementation, A/F isn't controlled to the stoichiometric level and the conversion efficiency of the TWC could be lower. Maintaining a higher level of TWC conversion efficiency requires more accurate A/F control and corrections of the UpO₂S λ shift issue. Therefore, using an O₂ sensor at the downstream part of the TWC (DownO₂S)~where the effects of unburnt elements in exhaust gas are smaller~can be an effective way to restore these challenges. We measured the relation between DownO₂S behavior and the TWC conversion efficiency on motorcycles and found out a strong correlation between them. With this correlation in mind, we were able to improve the TWC conversion efficiency by employing an A/F control system with Dual Oxygen Sensor (UpO₂S and DownO₂S).
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Abe, T., Kuratani, S., Mori, Y., and Yanase, D., "Application of Air Fuel Ratio Control to a Motorcycle with Dual Oxygen Sensor," SAE Technical Paper 2011-32-0629, 2011.Data Sets - Support Documents
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References
- Muranaka, Shigeo Yasuo, Nakajima “Gasoline Engines for Vehicles” 85 105 Sankaido 2004
- Falk, CD. Moony, J.J. “Three-Way Conversion Catalysts Effect of Closed-Loop Feed-Back Control and Other Parameters on Catalyst Efficiency” SAE paper 800462 1980