The power requirements for inner city transit buses are characterized by power peaks about an order of magnitude larger than the average power usage of the vehicle. For these vehicles, hybrid power trains can offer significantly improved fuel economy and exhaust emissions. A critical design challenge, however, has been developing the energy storage and power management system to respond to these rapid power variations. Most hybrid vehicles today use chemical energy storage batteries to supplement the power from the fuel burning generator unit. Chemical storage batteries however, present several difficulties in power management and control. These difficulties include (1) inadequate life, (2) limited current delivery as well as absorption during regenerative braking, (3) inaccurate measurement of state of charge, and (4) stored energy safety issues. Recent advances in ultra-capacitor technology create an opportunity to address these concerns. The NASA Lewis Research Center, in cooperation with industry and academia, has developed an advanced hybrid electric transit bus using ultra-capacitors as the primary energy storage system. At over 15,000-kg gross weight, this is the largest vehicle of its kind ever built using this advanced energy storage technology. Results of analyses show that the vehicle will match the performance of an equivalent conventionally powered vehicle over typical inner city drive cycles. This paper describes the overall power system architecture, the evolution of the control strategy, and analysis of power flow and vehicle performance.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Ultra-Capacitor Energy Storage in a Large Hybrid Electric Bus


    Beteiligte:
    L. A. Viterna (Autor:in)

    Erscheinungsdatum :

    1997


    Format / Umfang :

    12 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch





    Ultra-Capacitor based Hybrid Energy Storage and Energy Management for Mild Hybrid Vehicles

    Kulkarni, S.S. / Gandhi, N. / Chaithanya, N. et al. | British Library Conference Proceedings | 2014


    Ultra-Capacitor Based Hybrid Energy Module

    Daboussi, Zaher / Paryani, Anil | AIAA | 2006


    Ultra-Capacitor based Hybrid Energy Storage and Energy Management for Mild Hybrid Vehicles

    Chaithanya, Naga / Gandhi, Nikita / Govindarajan, Srinivasan et al. | SAE Technical Papers | 2014


    Effects of an Ultra-Capacitor and Battery Energy Storage System in a Hybrid Electric Vehicle

    Emadi, Ali / Raju, Besty / Park, Jesse | SAE Technical Papers | 2005