Lin Li Institute of Automotive Engineering - SACHINsachin.lk/docs/Dual_Clutch_Transmission_gdoc.pdf · Dual-Clutch Transmission (DCT) • Why a new transmission? • Structure of

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