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Optimizing Engine Parameters with Exhaust Gas Recirculation
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English
Abstract
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.
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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.Also In
References
- Thompson A. L. “Buick's 1972 Exhaust Gas Recirculation System.” Paper 720519 SAE National Automobile Engineering Meeting Detroit May 1972
- Freeman M. A. Nicholson R. C. “Valve Timing for Control of Oxides of Nitrogen (NO x ).” Paper 720121 SAE Automotive Engineering Congress Detroit January 1972
- Meacham G. B. Kirby “Variable Cam Timing as an Emission Control Tool.” SAE Transactions 79 1970 paper 700673
- Stivender D. L. “Development of a Fuel-Based Mass Emission Measurement Procedure.” Paper 710604 SAE International Mid-Year Meeting, Montreal Quebec June 1971
- Quader A. A. “Why Intake Charge Dilution Decreases Nitric Oxide Emission from Spark Ignition Engines.” SAE Transactions 80 1971 paper 710009
- Wartinbee W. J., Jr. “Emissions Study of Oxygen Enriched Air.” Paper 710606 SAE International Mid-Year Meeting Montreal, Quebec June 1971
- “Control of Air Pollution from New Motor Vehicles and New Motor Vehicle Engines,” Federal Register 38 124 June 28 1973