The EDC is a combination of two parallel half gearboxes, which work together and are both designed like a traditional manual gearbox. The engine torque is transmitted to each half gearbox via a specific clutch: One clutch looks after the odd-number gears (1st, 3rd and 5th) The second clutch covers the even-number gears (2nd, 4th and 6th), as well as reverse. At the perfect moment gears are changed by shifting from one clutch to the other, the first clutch opens whilst the second closes simultaneously which guarantees continuous and smooth traction during gear changes. The gears are carried by four shafts: two concentric primary shafts (each of which is connected to a clutch) and two secondary shafts. Gears are matched by means of synchronisers, as is the case with a manual gearbox. These synchronisers, like the clutches, are operated by electric actuators, which are in turn controlled by a control unit, which measures a number of parameters to select the ideal gear. The system instantaneously adapts to the drivers demands by selecting the gear, which delivers the right amount of power the instant it is required. The development of EDC as a dry dual–clutch, offers practical implications, by helping to limit friction and consequently deliver better performance. Additional features include: An optimised “creep” function which provides better fluidity especially whilst sitting in traffic jams and during manoeuvres e.g. parking. A reassuring assisted hill start support: prevents the vehicle from rolling backwards during a hill start Drivers have a choice of either Automatic mode or Flick-shift mode, which allows the driver more control over gear changes using the gear stick. Both modes allow an instant response to the drivers actions.
Posted on: Fri, 19 Dec 2014 15:30:16 +0000
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