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Exhaust Recirculation and Spark Control - A Speed Governed and Vacuum Modulated System
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1972 by SAE International in United States
Annotation ability available
Published test results have established that the recirculation of a portion of an engine's exhaust gas is an effective means of reducing oxides of nitrogen in the exhaust. Many methods of flow control have been tried; some require extensive revisions to the carburetion system. A retrofit system in which recirculation and spark advance are selectively controlled by vehicle speed and vacuum level has been tested on various cars to give 30-70% reductions in NOx as well as significant reductions in HC and CO. Revisions to the existing power train are minimal, while changes in driveability and fuel economy are hardly noticeable.
CitationMartin, E. and Vance, D., "Exhaust Recirculation and Spark Control - A Speed Governed and Vacuum Modulated System," SAE Technical Paper 720123, 1972, https://doi.org/10.4271/720123.
- Glass W. Russell F. R. Wade D. T. Hollabaugh D. M. “Evaluation of Exhaust Recirculation for Control of Nitrogen Oxides Emissions.” Paper 700146 presented at SAE Automotive Engineering Congress Detroit January 1970
- “Control Techniques for Carbon Monoxide, Nitrogen Oxide, and Hydrocarbon Emissions from Mobile Sources.” National Air Pollution Control Administration Publication No. AP-66 U.S. Department of Health, Education and Welfare
- Caplan John D. “Smog Chemistry Points the Way to Rational Vehicle Emission Control.” SAE Technical Progress Series 6 “Vehicle Emissions, Part 1.” New York Society of Automotive Engineers, Inc. 1964