Exhaust Recirculation and Spark Control - A Speed Governed and Vacuum Modulated System 720123
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.
Citation: Martin, 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. Download Citation
Author(s):
E. J. Martin, D. R. Vance
Affiliated:
Perfect Circle Div., Dana Corp.
Pages: 12
Event:
1972 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Nitrogen oxides
Fuel economy
Vacuum
Railway vehicles and equipment
Gases
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