The dual clutch transmission (DCT), also referred to as a double- or twin-clutch transmission, combines the best of both manual and automatic transmissions into a hybrid that requires no input from the driver to shift gears, provides smooth and fast shifting, and operates more efficiently than either a manual or an automatic transmission. Its unique configuration is known as a semi-automatic transmission. It uses two separate clutches, one which engages even numbered gears in the transmission while the other engages the odd numbered gears. While one gear, third gear for example, is engaged, the clutch has the next gear, possibly fourth gear if the driver is speeding up, ready to go so it can instantly switch from third to fourth without losing any of the engine's power and without requiring the driver to press down the clutch pedal as he would need to in a manual transmission car.

• To change gears with a manual transmission, drivers must depress a third pedal that controls the vehicle’s clutch, the mechanical device connecting the car’s engine to the gearbox.
• The dual-clutch automatic is a development of the sequential manual transmission (SMT), which is essentially a fully automated manual transmission with a computer-controlled clutch, intended to deliver stick-shift performance with automatic convenience.
• To be clear, an automated manual transmission (AMT) doesn't have a clutch pedal; there's only an accelerator and a brake pedal, just like a regular automatic. And if you leave an AMT in D mode, it basically performs like an automatic transmission -- all you have to do is worry about when to start and when to stop.

Since the car's driver isn't required to press a clutch pedal to shift gears, it would seem the dual clutch transmission is automatic. Yet it is actually semi-automatic. Electro-hydraulic fluid is used to engage and disengage the clutches. This fluid forces the clutch disk against the flywheel of the engine and the power spins the car's wheels. When the car slows, sensors send less fluid to the clutch and it disengages because the fluid's force is not strong enough to hold it against the flywheel.

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Manual Transmission Clutch Parts

Volkswagen “DSG” 6-speed dual-clutch automated-manual transmission It gets its name from the fact that there are two gear shafts – one for the odd-numbered gears (1, 3, 5, 7), another for the even-numbered gears (2, 4, 6) – each having its own clutch. Though manual transmissions will always offer the truest engagement between driver and vehicle, dual clutch setups provide lightning quick gear changes that lend greater speed to the driving equation. 10 Cars with Dual Clutch Transmissions.