The market for 4 wheel drive derivatives of passenger vehicles is evolving and expanding. The new customer base for these vehicles has increasingly demanding expectations for dynamics and stability, and there will be legislative pressures to improve roll over resistance of SUVs. Future 4 wheel drive systems must contribute to delivering these requirements in order to be competitive, so active driveline systems will become increasingly important. However, the pressure of CO2 emissions and fuel consumption requirements mean that power requirements for torque modulation must be minimised. The principles and benefits of active torque vectoring drivelines in controlling or enhancing vehicle dynamic responses are discussed. They can deliver: 1. Enhanced driving dynamics - reduced compromise between stability and responsiveness. 2. Optimised traction regardless of vehicle/road conditions. 3. Raised threshold for ESP Intervention, reduced intrusion of torque interruption delivering a more satisfying driving characteristic. 4. Different driving characteristics from the same hardware/platform by calibration adjustment. New hardware concepts that overcome the power consumption and heat generation issues with existing designs are described. An overview is given of an 'in house' project to build a prototype torque vectoring system in an SUV for research and demonstration purposes. Further development possibilities for active torque vectoring are discussed, in particular a scheme to combine active torque vectoring and a mild hybrid driveline based on a single DC Motor/Generator.


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    Title :

    Torque vectoring driveline: Design, simulations, capabilities and control


    Additional title:

    Antriebsmomentverteilung: Konstruktion, Simulation, Möglichkeiten und Regelung


    Contributors:
    Reynolds, B. (author) / Wheals, J. (author)


    Publication date :

    2003


    Size :

    27 Seiten, 23 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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