Two significantly differing levels of actuation hardware for electro-mechanical DCT (Dual Clutch Transmission) have been tested: Generation 1: MMLA (Moving Magnet Linear Actuator) devices for both gear and clutch actuation. A magnet assist device was applied to clutch actuation to reduce current. The standard clutch module was used. Generation 2: exploiting integration synergies between a lower cost clutch actuator and the dry clutch module. Gear actuation used a MMLA actuator. Clutch actuation used a revised actuator with dramatically less magnet material and simplified construction. The characteristics of this actuator were designed in concert with new clutch springs and the magnet assist device. Modular control software has been applied to control the gearbox both on rig and in the demo vehicle. Although the new actuation system provided new challenges for the control software, using a core-function based approach together with new, application specific actuation driver modules allowed a fast development of a control system for the new actuators. The software algorithms implemented are capable of controlling the actuators and will deliver good vehicle performance. Validated simulation and measurement indicates that power consumption is nominally 49 - 69 W, at 25 - 100 deg C respectively, averaged over the NEDC cycle. This is to be validated, and compared to a measurement of 120 W for current product. By powering the standard actuation unit from a source independent of the vehicle, it was found that this power related to a 3.3 % improvement in CO2. The actuation system developed then provides a 1.4 % CO2 saving. A costing exercise indicated potential for cost saving for actuation module relative to Getrag 6DCT and cost parity, after normal productionisation, with VW DQ200. If system benefits are fully exploited to provide driveline damping and the deletion of the DMF for certain vehicles, then a 90 USD/per vehicle advantage over DQ200 appears possible. Related technologies also progressed: Anti-rollback device was manufactured and demonstrated; cooled dry clutch subject to further analysis and installation study.


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    Title :

    Electro-mechanical dual clutch transmission. Implementation of moving magnet linear actuation concept in a DCT demonstration vehicle


    Contributors:


    Publication date :

    2011


    Size :

    22 Seiten, 33 Bilder, 5 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Electro-Mechanical Dual Clutch Transmission - Implementation of Moving Magnet Linear Actuation concept in a DCT demonstration vehicle

    Wheals, J. / Behrenroth, J. / Hose, M. et al. | British Library Conference Proceedings | 2011



    Dual clutch transmission with dry clutch and electro-mechanical actuation

    Faust,H. / Buender,C. / Devincent,E. et al. | Automotive engineering | 2010