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Design of an Electromechanical Ratio and Clamping

Pump efficiency. Superfluous oil flow. Leak -> larger pump. Overclamping -> high oil ... 10. Variator actuation alternatives. Two stage pump. Electro-hydraulics ...

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Design of an Electromechanical Ratio and Clamping

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    Slide 1:Design of an Electromechanical Ratio and Clamping Force Actuator for a Metal V-belt Type CVT

    Koen van de Meerakker, Nick Rosielle, Bram Bonsen, Tim Klaassen Technische Universiteit Eindhoven

    Slide 2:Related sessions

    Low level control of CVTs 1 (4) Bram Bonsen Low level control of CVTs 2 (13) Tim Klaassen (49) Bram Veenhuizen Theory in CVT applications (3) Bram Bonsen

    Slide 3:Belt CVT basics

    3

    Slide 4:Variator actuation tasks

    Sheave position -> Transmission ratio Belt clamping force 4

    Slide 5:Typical CVT layout

    Slide 6:CVT driveline efficiency

    With CVT, efficient IC engine use 6

    Slide 7:However: Car with MT often more fuel-efficient Power loss in CVT

    Slide 8:Power loss sources

    Bearings, gears, seals Torque converter Variator efficiency Hydraulic actuation 8

    Slide 9:Actuation power loss

    Pump efficiency Superfluous oil flow Leak -> larger pump Overclamping -> high oil pressure 9

    Slide 10:Variator actuation alternatives

    Two stage pump Electro-hydraulics Electromechanical actuation

    Slide 11:EM concept

    Spindle Pulley shaft

    Slide 13:EM concept

    Slide 14:Prototype approach

    Modification of existing transmission Actuators only in and on new outer cover Separate electric oil pump for accessories

    Slide 19:

    22

    Slide 23:Features

    Pri-sec mechanisms on same transmission side Energy exchange pri-sec Separate ratio and clamping force motors No adjustment = no thrust bearing or el. motor rotation Electric motors outside transmission housing Stiff in comparison to low pressure hydraulics 23

    Slide 24:Next

    - Prototype assembly - Assessment on test rig Assessment in Vehicle Redesign of research proto 24 Picture: Audi AG

    Slide 25:Conclusions

    Efficiency potential EM actuation proposed Prototype evaluation coming soon

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