This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Spark Ignition Engine Control Variables Study
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1973 by SAE International in United States
Annotation ability available
Systematic testing of a fuel injected 429 in3 (7.03 dm3) V-8 engine at steady states produced data from which the effects on emissions of three control variables in combination could be determined. Plotted data of brake specific nitric oxide, hydrocarbons, and carbon monoxide, as well as brake specific fuel consumption, are presented as a function of air-fuel ratio, ignition timing, and percent of exhaust gas recirculation (EGR). Analysis of trends shows that EGR permits nitric oxides control with less fuel consumption penalty than extreme rich operation alone. Nitric oxide control is shown to be important at low power levels as well as high, while hydrocarbons are much more of a problem at the lowest power levels than at high engine outputs. An optimum engine size for the weight of a vehicle is indicated. Simulation of warm engine emission tests permits comparisons between several control approaches, suggesting entirely different calibrations are indicated for different emission performance goals.
CitationKeranen, T. and Wertheimer, H., "Spark Ignition Engine Control Variables Study," SAE Technical Paper 730004, 1973, https://doi.org/10.4271/730004.
- Federal Register, Vol. 35, No. 219, Part II, Nov. 10, 1970, as amended by Federal Register, Vol. 36, No. 128, Part II, July 2, 1971.
- Schweitzer Paul H., “Correct Mixtures for Otto Engines” and “Fishhooks and Carburetor Calibration.” SAE Transactions, Vol. 79 (1970), papers 700884 and 700885, respectively.
- Myers P. S., Uyehara O. A., and Newhall H. K., “The ABCs of Engine Exhaust Emissions.” SAE Transactions, Vol. 80 (1971), paper 710481.
- Lee R. C., “Effect of Compression Ratio, Mixture Strength, Spark Timing, and Coolant Temperature Upon Exhaust Emissions and Power.” Paper presented at SAE National Combined Truck, Powerplant, Fuels & Lubricants Meetings, St. Louis, Mo., October 1971.
- Quader Ather A., “Why Intake Charge Dilution Decreases Nitric Oxide Emission from Spark Ignition Engines.” SAE Transactions, Vol. 80 (1971), paper 710009.
- Huls T. A., Myers P. S., and Uyehara O. A., “Spark Ignition Engine Operation and Design for Minimum Exhaust Emission.” Published in SAE Progress in Technology, Vol. 12, “Vehicle Emissions-Part II.” New York: Society of Automotive Engineers, Inc., 1967.
- Meguerian G. H. and Lang C. R., “NOx Reduction Catalysts for Vehicle Emission Control.” SAE Transactions, Vol. 80 (1971), paper 710291.
- Liimatta D. R., Hurt R. F., Deller R. W., and Hull W. L., “Effects of Mixture Distribution on Exhaust Emissions as Indicated by Engine Data and the Hydraulic Analogy.” SAE Transactions, Vol. 80 (1971), paper 710618.
- Felt A. E. and Krause S. R., “Effects of Compression Ratio Changes on Exhaust Emissions.” SAE Transactions, Vol. 80 (1971), paper 710831.
- Meacham G. B. Kirby, “Variable Cam Timing as an Emission Control Tool.” SAE Transactions, Vol. 79 (1970), paper 700673.