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Spindt-Based AFR Sensitivities to Exhaust Emissions Measurement Accuracy for GDI Internal Combustion Engines HPE-COXA
- Format:
- Book
- Conference/Event
- Author/Creator:
- Benvenuti, Tommaso, author.
- Conference Name:
- SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- Air-fuel ratio (AFR) is one of the factors which most influences performance and emissionsin internal combustion engine. Since the chemical content of exhaust gasses are directlylinked to the composition of fuel and air introduced in the engine, engineers have alwayslooking for correlations that could evaluate the AFR for each engine operation conditionbased on exhaust gas emissions. These relations allow to determine the effective AFRat which the engine is running. So in the first part of this paper, the main correlationsavailable in literature are reviewed pointing out their hypothesis and assumptions. Thenthe base Spindt formula and two of its generalization are applied to the experimental dataobtained from a gasoline direct injection supercharged engine. Subsequently the contri-bution added on the AFR computation by each exhaust compound has been evaluatedin order to understand their weights on the AFR final value. Finally all the three AFRformulations have been differentiated with respect to the different compounds: this allowto evaluate the sensitivity that each correlation shows towards each compounds. So, bydoing this, it was possible to find out which are the species whose changes more influencesthe computed AFR value and so which are the ones that need to be measured with greateraccuracy by the gas analyzers in the whole engine operating range. All this analysis hasbeen carried out over the experimental data referred to a wide range of operating conditionfor the engine tested
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-0613
- Access Restriction:
- Restricted for use by site license
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