A Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion
2006-01-0195
04/03/2006
- Event
- Content
- 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.
- Pages
- 13
- Citation
- 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.