Recent chassis testing of hybrid buses demonstrated the potential of hybrid technology to reduce emissions and raise fuel economy relative to conventional buses. However, hybrid buses represent a certification quandary because the engines must be certified using the accepted Federal Test Procedure (FTP), without regard for benefits that may arise from less transient engine operation. Actual engine operating data from series configuration hybrid buses were analyzed to determine the envelopes of torque and speeds covered by the engine. Transient engine operation was also considered in terms of rates of change of torque, power and speed. These measures did not compare closely with similar measures computed from the FTP because the series hybrid engines explored a more structured zone of operation than the FTP implied and because the FTP represented more transient operation. A modal data analysis revealed that the Euro III 13 mode steady srate test was the most inclusive and representative cycle for the heavy-duty hybrid vehicle engines evaluated for this study.


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    Title :

    Operating envelopes of hybrid bus engines


    Contributors:
    Clark, N.N. (author) / Azu, A. (author) / Jarrett, R. (author) / Balon, T. (author) / Moynihan, P. (author) / Lynch, S. (author) / Webb, T. (author)


    Publication date :

    2001


    Size :

    12 Seiten, 19 Bilder, 1 Tabelle, 7 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Operating Envelopes of Hybrid Bus Engines

    Azu, Akunor / Clark, Nigel / Moynihan, Paul et al. | SAE Technical Papers | 2001


    Operating envelopes of hybrid bus engines

    Clark,N.N. / Azu,A. / Jarrett,R. et al. | Automotive engineering | 2001