CALCULATED NITRIC OXIDE EMISSIONS OF AN UNTHROTTLED SPARK IGNITED, STRATIFIED CHARGE INTERNAL COMBUSTION ENGINE

This paper presents a theoretical study of nitric oxide emissions from an unthrottled stratified charge, spark ignition engine. A three-region (generally rich, stoichiometric, and lean) combustion model was used, and the effects of the following variables were studied: 1. Excess air number of the rich mixture. 2. Percentage of the total fuel in the rich-mixture region. 3. Percentage of fuel burned stoichometrically. 4. Exhaust gas recirculation, percentage and distribution. Comparisons are made to both experimental results from a throttled engine and calculated results for an unthrottled engine with a homogeneous mixture. For illustrative purposes, an application of the model to a particular geometrical form of charge distribution is analyzed.

• Corporate Authors:

  Society of Automotive Engineers

  485 Lexington Avenue
  New York, NY  United States  10017
• Authors:
  • TABACZYNSKI, R J
  • Klomp, E D
• Publication Date: 1974-10

Media Info

• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Exhaust gases; Internal combustion engines; Nitric oxide; Pollutants; Stratified charge engines
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00084060
• Record Type: Publication
• Report/Paper Numbers: SAE Paper No. 741171
• Files: TRIS
• Created Date: Apr 22 1975 12:00AM