A Turbocharged Spark Ignition Engine with Low Exhaust Emissions and Improved Fuel Economy 730633
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.
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. Download Citation
Author(s):
John F. Schweikert, John H. Johnson
Affiliated:
Michigan Technological University
Pages: 16
Event:
Fleet Week
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Exhaust gas recirculation (EGR)
Exhaust emissions
Spark ignition engines
Carbon monoxide
Fuel economy
Emissions
Hydrocarbons
SAE MOBILUS
Subscribers can view annotate, and download all of SAE's content.
Learn More »