Optimizing Engine Parameters with Exhaust Gas Recirculation 740104
In addition to designing and developing hardware to control the exhaust gas recirculation (EGR) rate, it is equally important to tailor the other engine variables. Optimization of air-fuel ratio (A/F) and spark timing is required to achieve the best combination of oxides of nitrogen (NOx), hydrocarbon (HC), and carbon monoxide (CO) control, while minimizing the losses in fuel economy and drivability.
This paper describes an engine dynamometer and vehicle study which defines the relationship between the above para meters. In general, increasing the spark advance with increasing EGR rates will minimize the losses in fuel economy and vehicle drivability while achieving significant reductions in NOx emissions. This approach is limited by a deterioration in HC emission control. The loss in HC control can be minimized by spark retard, but with a loss in fuel economy. The A/F must be tailored to maintain good combustion for HC emission control without excessive richness and loss of CO emission control.
Citation: Gumbleton, J., Bolton, R., and Lang, H., "Optimizing Engine Parameters with Exhaust Gas Recirculation," SAE Technical Paper 740104, 1974, https://doi.org/10.4271/740104. Download Citation
Author(s):
James J. Gumbleton, Robert A. Bolton, H. Walter Lang
Affiliated:
Engineering Staff, General Motors Corp.
Pages: 10
Event:
1974 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1974 Transactions-V83-A
Related Topics:
Exhaust gas recirculation (EGR)
Emissions control
Nitrogen oxides
Carbon monoxide
Fuel economy
Air / fuel ratio
Hydrocarbons
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