Modelling NOx emissions from spark-ignition engines

Jose Ricardo Sodre*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A rapid chemical equilibrium composition model was applied to calculate the main combustion products from spark-ignition engines. The kinetic concentrations of oxides of nitrogen were evaluated on the basis of their equilibrium concentrations. To validate the model, experiments were carried out in a single-cylinder research engine. Results for CO, CO2, O2 and NOx emissions show good agreement between model and experiments for varied air-fuel ratio, speed, ignition timing, compression ratio and cylinder wall temperature.

Original languageEnglish
Pages (from-to)929-934
Number of pages6
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Issue number8
Publication statusPublished - 1 Aug 2000

Bibliographical note

Publisher Copyright:
© 2000 Institution of Mechanical Engineers.


  • oxides of nitrogen
  • engine modelling
  • emissions


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