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Dual Clutch Transmission
Technological Advantages and
Implementation Strategies
June, 2010
Electro-Hydraulic Controls for
DCTs
Michael Ritschel 2
Terminology
Electro-hydraulic controls for wet and
dry DCTs
Electro-hydraulic controls Electro-hydraulic controls
w/ steady state pump w/ on demand pump
(„Low pressure“ systems) („High pressure“ systems)
Wet DCT Wet DCT
Dry DCT
LP System HP System
3
Electro-Hydraulic Principle
Input Signal Output Power
electric hydraulic
current solenoid flow/pressure
spool
F
hydraulic
F
magnetic
armature
Electric Hydraulic
4
Outline
Electro-Hydraulic Controls LP Systems
- Steady State Pump -
Power Supply
DCT Power Flow
Controls Modules
Controls Functions w/ Examples
Electro-Hydraulic Controls HP Systems
- On Demand Pump -
Power Supply
DCT Power Flow
Controls Modules
Controls Functions w/ Examples
5
LP System -
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