Progress in DOC, DPF and SCR Simulation

Roland  Wanker, AVL

Simulation of aftertreatment devices has become a key method to meet the increasingly stringent emissions standards. However, the limited accuracy of the pysical and chemical models and the need for the indentification of a large number of model parameters often limit the reliability of the calculated results.

This talk will describe improvements of the accuracy and of the predictive ability of the catalyst (DOC, SCR, NOx Trap) and DPF (bare trap, CSF, …) models in BOOST and FIRE that were achieved recently:
The DOC model was extended by the effect of HC storage what leads to significantly better results in the simulation of transient test cycles (EUDC, FTP,…).
The DPF model can now handle subtrate types with different inlet and outlet diamters (Octosquare,…). In addition to that the effects of the plugs and of the ash layer were included. Furthermore the filtration and regeneration models were extended.
For the SCR the focus for the development was on the effects of spray, evaporation, mixing and thermolysis/hydrolysis reactions. Results of a case study for different mixing devices are shown.

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