The Effects of Engine Variables and Exhaust Gas Recirculation on Emissions, and Fuel Economy - Part IV 780591
Steady state engine mapping data were obtained from a 400 CID, V-8 spark ignition engine at compression ratios (CR) of 9.3 and 8.0. Data were obtained for seven steady-state speed-load conditions and also for one transient condition to determine the effect of compression ratio on fuel consumption at various exhaust emission levels. These speed-load points were selected to represent engine operating points during the CVS-H cycle. Earlier results at high speed-load conditions indicated that lower fuel consumption could be achieved with the 9.3 CR configuration, even when emission constraints for HC and NOx were imposed. Also at the low speed-load conditions, at high or unconstrained HC levels, fuel consumption was found to be lower at 9.3 CR; but HC emissions could not be reduced as far at 9.3 CR as at 8.0. Finally, all of the speed-load points were combined in time-weighted cycle simulations to compare the two compression ratios by several emissions and fuel consumption criteria.
Citation: Kirklin, P. and Wise, S., "The Effects of Engine Variables and Exhaust Gas Recirculation on Emissions, and Fuel Economy - Part IV," SAE Technical Paper 780591, 1978, https://doi.org/10.4271/780591. Download Citation
Author(s):
P. W. Kirklin, S. S. Wise
Affiliated:
Mobil Research and Development Corporation
Pages: 11
Event:
Passenger Car Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Spark ignition engines
Exhaust gas recirculation (EGR)
Fuel consumption
Exhaust emissions
Fuel economy
Emissions
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