Browse Publications Technical Papers 2013-01-1311
2013-04-08

A Quasi-Dimensional NO x Emission Model for Spark Ignition Direct Injection (SIDI) Gasoline Engines 2013-01-1311

A fundamentally based quasi-dimensional NOx emission model for spark ignition direct injection (SIDI) gasoline engines was developed. The NOx model consists of a chemical mechanism and three sub-models. The classical extended Zeldovich mechanism and N₂O pathway for NOx formation mechanism were employed as the chemical mechanism in the model. A characteristic time model for the radical species H, O and OH was incorporated to account for non-equilibrium of radical species during combustion. A model of homogeneity which correlates fundamental dimensionless numbers and mixing time was developed to model the air-fuel mixing and inhomogeneity of the charge. Since temperature has a dominant effect on NOx emission, a flame temperature correlation was developed to model the flame temperature during the combustion for NOx calculation.
Measured NOx emission data from a single-cylinder SIDI research engine at different operating conditions was used to validate the NOx model. The effects of fuel injection timing, injection pressure, spark timing, overall engine AFR, and intake temperature on NOx emission were examined and well captured by the model. Comparison of all the NOx emission data with the model indicates that the NOx model is a good predictive tool for NOx emissions in SIDI engines.

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

A Semi-Physical NOx Model for Diesel Engine Control

2013-01-0356

View Details

TECHNICAL PAPER

An Experimental Study of Dieseline Combustion in a Direct Injection Engine

2009-01-1101

View Details

TECHNICAL PAPER

Parametric Studies of Performance and NOx Emissions of the Three-Valve Stratified Charge Engine Using a Cycle Simulation

780320

View Details

X