Due to environmental and legislative concerns, less polluting and more efficient vehicle powertrain systems must be developed. A first step is a simple, low cost system such as the presented Engine Stop-Start (ESS) system. A 1.9 liter four-cylinder spark-ignition engine with a four-speed automatic transmission was modified to enable fuel off-on transitions during decelerations and stops. Additional hardware includes a 7 kW electric motor-generator, a power electronics module with an inverter and a DCDC converter, a 36 Volt nominal battery system, and minor modifications to the transmission. A control scheme was developed which takes advantage of the system's fuel saving potential while minimally affecting driveability. Tests have shown EPA City fuel economy gains of approximately 12-14 percent while maintaining the same emissions classification. The EPA Highway fuel economy was increased by approximately 1 percent.


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    Title :

    Saturn Engine Stop-Start System with an Automatic Transmission


    Additional title:

    Sae Technical Papers


    Contributors:
    Downs, Bob (author) / Skaggs, Christopher (author) / Tamai, Goro (author) / Taylor, Joel (author) / Hoang, Tony (author)

    Conference:

    SAE 2001 World Congress ; 2001



    Publication date :

    2001-03-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Saturn engine stop-start system with an automatic transmission

    Tamai,G. / Hoang,T. / Taylor,J. et al. | Automotive engineering | 2001


    2001-01-0326 Saturn Engine Stop-Start System with an Automatic Transmission

    Tamai, G. / Hoang, T. / Taylor, J. et al. | British Library Conference Proceedings | 2001



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