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Double-clutching (also called double de-clutching outside of the United States) is a method of shifting gears used primarily for vehicles with an unsynchronized manual transmission, such as commercial trucks and specialty vehicles.
Double-clutching: releasing the clutch in neutral to synchronize the speeds of the shafts within the transmission [7] Float shifting: shifting without using the clutch; In big rigs and semi-trucks, the driver may have to complete 24 or more gear changes when accelerating from a standstill to 70 mph (110 km/h).
[3] [7] By timing the operation of one clutch to engage at the precise moment that the other is disengaging, a DCT can shift gears without interrupting the torque supply to the wheels. [6] [7] A DCT uses clutch packs (as per a manual transmission), rather than the torque converter used by traditional (hydraulic) automatic transmissions. [1]
The Ford unit is a six-speed with one clutch acting on reverse, first, third, and fifth gears, and the other used for second, fourth, sixth gears. As the first gear is engaged, the 2-4-6 clutch is disengaged and the second gear cogs are engaged. At the appropriate time, the R-1-3-5 clutch is disengaged and the 2-4-6 clutch is engaged.
Float shifting (also called "floating gears") is changing gears without disengaging the clutch, usually on a non-synchronized transmission used by large trucks. Since the clutch is not used, it is easy to mismatch speeds of gears, and the driver can quickly cause major (and expensive) damage to the gears and the transmission.
In June 2014, [4] Volvo Trucks presented a new dual-clutch version of the I-Shift, known as SPO2812, with overdrive and a maximum torque of 2800 N·m. [5] The dual-clutch version is only available for trucks up to 540 hp. The I-Shift Dual Clutch has two input shafts which are alternatively connected to the engine through two clutches.
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These are dual-clutch transmissions. 2008–present 6DCT 150 6-speed wet clutch. Ford Fiesta; 2008–present 6DCT 250 (DPS6) 6-speed dry clutch. Ford EcoSport, Ford Fiesta, Ford Focus. The 2012-2016 DPS6 Powershift transmission was used in the 2012–2016 Ford Focus and 2011–2016 Ford Fiesta sedans. This transmission is the subject of a ...