This paper presented a real-time capable engine-out soot model which uses the mathematical approach of Taylor series expansion for good calculation and reproduction of the engine-out soot emissions produced by a combustion engine, based on a current 2-liter diesel engine. The model works with an engine-out soot map ascertained by steady-state measurement on a dynamometer for various engine speeds and fuel injection masses. State-of-the-art, highly dynamic soot particle measuring equipment was used for this purpose. This Pegasor Particle Sensor was suitable for mobile use in the vehicle including all the supply media, so that this system was used not only to obtain the data calibration but also for alignment of the whole model, e.g. during on-road tests. Steady-state measurement of an engine-out soot map was joined by further trips/driving cycles with the vehicle, including various exhaust roller dynamometer tests, to generate the data calibration for the whole model. Various results of the engine-out soot model show very good correlation between the measured engine-out soot emissions and those calculated with the model. Very good results have been obtained for the new european driving cycle (NEDC) with a very small absolute error and low standard deviation for this test. The model presented in this paper has also generated very good results for the FTP75 cycle. As well as comparing the calculated and measured values for exhaust roller dynamometer tests, results have also been obtained for on-road measurements. Here too the model has produced very good results, illustrating the suitability of the engine-out soot model. This was followed by assessing the overall engine-out soot model in terms of robust response, e.g. to deviation (production tolerance) in the sensor used in the vehicle. In this context, it can be said that changing the signal of an influencing parameter used in the model (e.g. drift in the boost pressure sensor) has only a slightly negative impact on the results of the engine-out soot model. To summarize, it can be said that the engine-out soot model presented in this paper based on Taylor series expansion is well suited for calculation of the engine-out soot emissions for a current dieselengine vehicle. It is therefore possible to seriously derive fleet use of this engine-out soot model, in combination with the results of the sensitivity analysis.
Development and validation of an engine-out soot model for passenger car diesel engines based on Taylor series expansion
2012
8 Seiten, 14 Bilder, 3 Quellen
Conference paper
Storage medium
English
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