A phenomenological model is presented that predicts NO emissions from a conventional heavy-duty diesel combustion process. As the model is intented for application in the field of engine control, modeling activities have aimed at limiting the computational effort while maintaining a sound physical/chemical basis. The main inputs to the model are in-cylinder pressure data and trapped in-cylinder conditions together with basic fuel spray information. For its validation measured concentrations of respectively in-cylinder and exhaust gas NO from two different engines have been used. Relative changes in NO for a variation in fuel injection timing and for a variation in exhaust gas recirculation rate are well captured by the model. However, absolute emission levels are significantly overpredicted. Observed deviations are evaluated and possible explanations are suggested.
Phenomenological NO model for conventional heavy-duty diesel engine combustion
2008
12 Seiten, 5 Bilder, 3 Tabellen, 27 Quellen
Conference paper
English
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