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.


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    Titel :

    The Effects of Engine Variables and Exhaust Gas Recirculation on Emissions, and Fuel Economy - Part IV


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Kirklin, P. W. (Autor:in) / Wise, S. S. (Autor:in)

    Kongress:

    Passenger Car Meeting & Exposition ; 1978



    Erscheinungsdatum :

    1978-02-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The effects of engine variables and exhaust gas recirculation on emissions, and fuel economy - Part 4

    Kirklin,P.W. / Wise,S.S. / Mobil Research and Development,US | Kraftfahrwesen | 1978




    The Effects of Exhaust Gas Recirculation and Residual Gas on Engine Emissions and Fuel Economy

    Kobayashi, Hiroyuki / Komagome, Reijiro / Kaneko, Yasuo | SAE Technical Papers | 1975


    The Effects of Exhaust Gas Recirculation and Residual Gas on Engine Emissions and Fuel Economy

    Kaneko,Y. / Kobayashi,H. / Komagome,R. et al. | Kraftfahrwesen | 1975