1 Design of an Electromechanical Ratio and Clamping Force Actuator for a Metal V-belt Type CVT Koen...
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Transcript of 1 Design of an Electromechanical Ratio and Clamping Force Actuator for a Metal V-belt Type CVT Koen...
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
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Related sessions
Low level control of CVT’s 1 (4) Bram Bonsen
Low level control of CVT’s 2 (13) Tim Klaassen
(49) Bram
Veenhuizen
Theory in CVT applications (3) Bram Bonsen
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Belt CVT basics
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Variator actuation tasks
Sheave position -> Transmission ratio
Belt clamping force
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Typical CVT layout
Picture: Nissan Europe
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CVT driveline efficiency
With CVT, efficient IC engine use
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However:
Car with MT often more fuel-efficient
Power loss in CVT
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Power loss sources
Bearings, gears, seals
Torque converter
Variator efficiency
Hydraulic actuation
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Actuation power loss
Pump efficiency
Superfluous oil flow
Leak -> larger pump
Overclamping -> high oil pressure
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Variator actuation alternatives
Two stage pump
Electro-hydraulics
Electromechanical actuation
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EMconcept
M ratio
M clamp
Pri
Sec
Engine, TC
Wheels
Spindle
Spindle
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SpindlePulley shaft
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EMconcept
M ratio
M clamp
Pri
Sec
Engine, TC
Wheels
Spindle
Spindle
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Prototype approach
Modification of existing transmission
Actuators only in and on new outer
cover
Separate electric oil pump for
accessories
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Picture: Nissan Europe
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2222
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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
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Next
- Prototype assembly
- Assessment on test rig
- Assessment in Vehicle
-Redesign of research proto
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Picture: Audi AG
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Conclusions
Efficiency potential
EM actuation proposed
Prototype evaluation coming soon