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A Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion
Technical Paper
2006-01-0195
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this paper a fast NOx model is presented which can be used for engine optimization, aftertreatment control or virtual mapping. A cylinder pressure trace is required as input data. High calculation speed is obtained by using table interpolation to calculate equilibrium temperatures and species concentrations. Test data from a single-cylinder engine and from a complete six-cylinder engine have been used for calibration and validation of the model. The model produces results of good agreement with emission measurements using approximately 50 combustion product zones and a calculation time of one second per engine cycle. Different compression ratios, EGR rates, injection timing, inlet pressures etc. were used in the validation tests. The model calculates thermal (high-temperature) NOx formation by the two reactions of the original Zeldovich mechanism but by using a simple empirical compensation algorithm, the model can also be used for low-temperature NOx formation associated with high EGR rates and long ignition delay.
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Andersson, M., Johansson, B., Hultqvist, A., and Nöhre, C., "A Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion," SAE Technical Paper 2006-01-0195, 2006, https://doi.org/10.4271/2006-01-0195.Also In
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