Dual-Clutch Transmission Lin Li Institute of Automotive Engineering
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Dual-Clutch Transmission
Lin Li
Institute of Automotive Engineering
Dual-Clutch Transmission (DCT)
• Why a new transmission?
• Structure of Dual-Clutch Transmission
• Advantages of DCT
• Who are using DCT?
• Summary
Reason for a new transmission
• The current ones:
– Manual Transmission (MT)
– Automatic Transmission (AT)
– Other transmissions (CVT, etc.)
CVT: Continuous Variable Transmission
Reason for a new transmission
• When a gear shifting happens…
Reason for a new transmission
• First, the clutch is opened.
Reason for a new transmission
• Second, driver shifts the gear with the lever.
Reason for a new transmission
• Finally, the clutch is closed.
Reason for a new transmission
• Waste of fuel
• Power-lost during the shifting
• Discomfort
Reason for a new transmission
• Conflict:
OPENED
• Safety
• Structure reason
CLOSED
• Comfort
• Dynamic
• Fuel cost
• Air pollution
Clutch
?
Clutch
?
Reason for a new transmission
• Could we add an other clutch into our
transmission?
!!
A New Transmission
• DCT from
Volkswagen:
[ DQ250 ]
Structure of DCT
A simple view of the structure
Structure of DCT
Structure of DCT
Advantages of DCT
• Power is always transferred to the wheels
Advantages of DCT
• No power interruption at gear shifting
• Less fuel consumption
• Better drive dynamic
• Better comfort
• Drive faster and faster
Advantages of DCT
• And…maintains high efficiency
Who are using DCT?
• Manufacturer: ZF (7 DT 45)
• 7 Gears
• Wet Dual-Clutch
• Max. torque: 500 Nm
• Max. input speed: 8000 1/min
Porsche 911 Targa 4S
Who are using DCT?
• Manufacturer: Getrag (7DCI600)
• 7 Gears
• Wet Dual-Clutch
• Max. torque: 600 Nm
• Max. input speed: 9000 1/min
BMW M3 Limousine
Who are using DCT?
66% (-16)
15%(+14)
13%(-1)
Prognosis 2015 in Europe
Thank You!
Lin Li
Institute of Automotive Engineering
www.iff.tu-bs.de
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