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A Turbocharged Spark Ignition Engine with Low Exhaust Emissions and Improved Fuel Economy
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Sector:
Event:
Fleet Week
Language:
English
Abstract
Turbocharging, in addition to increasing an engine's power output, can be effectively used to maintain exhaust emission levels while improving fuel economy. This paper presents the emission and performance results obtained from a turbocharged multicylinder spark ignition engine with thermal reactors and exhaust gas recirculation (EGR) operated at steady-state, part-load conditions for four engine speeds.
When comparing a turbocharged engine to a larger displacement naturally aspirated engine of equal power output, the emissions expressed in grams per mile were relatively unchanged both with and without EGR. However, turbocharging provided an average of 20% improvement in fuel economy both with and without EGR.
When comparing the turbocharged and nonturbocharged versions of the same engine without EGR at a given load and speed, turbocharging increased the hydrocarbon (HC) and carbon monoxide (CO) emissions and decreased oxides of nitrogen (NOx) emissions. With the addition of EGR, turbocharging increased all three emissions.
When comparing turbocharged and nonturbocharged engines of equal displacement on the heavy-duty 13-mode dynamometer cycle, turbocharging reduced CO emissions and increased the HC and NOx emissions both with and without ERG.
Authors
Topic
Citation
Schweikert, J. and Johnson, J., "A Turbocharged Spark Ignition Engine with Low Exhaust Emissions and Improved Fuel Economy," SAE Technical Paper 730633, 1973, https://doi.org/10.4271/730633.Also In
References
- “The Clean Air Act.” Environmental Protection Agency Washington, D. C. December 1970
- “Federal Register.” 36 128 July 2 1971
- Blackshear, P. L. Jr. Barnes M. H. Kittleson D. B. Murphy T. E. Snegoski J. P. Barnes K. D. “Pressure Dependence of CO Reduction in a Thermal Reactor for I.C. Engine Emission Control.” Combustion Institute Ann Arbor, Mich. 1971
- Thomson J. C. “A Report on the Exhaust Emissions from a Turbocharged Volkswagen.” Bureau of Mobile Source Pollution Control, Environmental Protection Agency Washington, D. C. May 1971
- Schweikert J. F. “A Turbocharged Spark-Ignition Engine for Low Exhaust Emissions.” Michigan Technological University 1972
- Buchi A. J. “Exhaust Turbocharging of Internal Combustion Engines.” Journal of the Franklin Institute Philadelphia July 1953
- “1972 SAE Handbook.” New York Society of Automotive Engineers, Inc. 1972
- Stivender D. L. “Development of a Fuel-Based Mass Emission Measurement Procedure.” Paper 710604 SAE Mid-Year Meeting Montreal June 1971
- Eltinge L. “Determining Fuel-Air Ratio and Distribution from Exhaust Gas Composition.” SAE Transactions 77 1968 paper 680114
- “Federal Register.” 37 175 September 8 1972