A Predictive Real Time NOx Model for Conventional and Partially Premixed Diesel Combustion

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


A previously presented robust and fast diagnostic NOx model was modified into a predictive model. This was done by using simple yet physically based models for fuel injection, ignition delay, premixed heat release rate and diffusion combustion heat release rate.

The model can be used both for traditional high-temperature combustion and for high-EGR, low-temperature combustion.

It was possible to maintain a high accuracy and calculation speed of the NOx model itself. The root mean square of the relative model error is 16% and the calculation speed is around one second on a PC. Combustion characteristics such as ignition delay, CA50 and the general shape of the heat release rate are well predicted by the combustion model.

The model is aimed at real-time NOx calculation and optimization in a vehicle on the road.


  • Magnus Andersson
  • Bengt Johansson
  • Anders Hultqvist
  • Christof Nöhre
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Annan maskinteknik


TidskriftSAE technical paper series
StatusPublished - 2006
Peer review utfördJa


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