Browse Publications Technical Papers 2013-01-0356
2013-04-08

A Semi-Physical NOx Model for Diesel Engine Control 2013-01-0356

In this paper, a new physics-based model for the prediction of NOx emissions produced by diesel engines is presented. The aim of this work is to provide a reference model for the validation of control strategies and NOx estimators. The model describes the NOx production in the burned gas zone where the burned gas temperature sub-model is adapted to be generic and tunable. The model consists of three main sub-models for the estimation of the burned gas temperature, the concentration of the species in the burned gases and the NOx formation, respectively. A new model for estimating the burned gas temperature, known to have a strong impact on thermal NOx formation rate, is proposed. The model depends on the intake burned gas ratio and the combustion phasing computed from the cylinder pressure. This model has a limited number of calibration parameters identified so that NOx model output matches with experimental data measured in a four-cylinder, four-stroke, direct-injection diesel engine. The proposed model is compared with a standard physical zero-dimensional thermodynamic approach. The new burned gas temperature sub-model enables to highly improve NOx estimation accuracy both in steady-state and transient operations, compared to purely physical models.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Experimental and Numerical Studies of High Pressure Multiple Injection Sprays

960861

View Details

TECHNICAL PAPER

The Influence of Physical Input Parameter Uncertainties on Multidimensional Model Predictions of Diesel Engine Performance and Emissions

2000-01-1178

View Details

TECHNICAL PAPER

Numerical Investigation on the Spray Characteristics and Combustion Process in a DI Diesel Engine at Reduced Temperature Combustion Condition

2011-24-0009

View Details

X