2010 Geneva Auto Show: Renault EDC Automatic Dual Clutch Transmission

Renault is introducing its new six-speed automatic dual-clutch transmission at the Geneva Auto Show. Dubbed EDC (Efficient Dual Clutch), the transmissions offers a 17 percent reduction in fuel consumption and CO2 emissions, when compared to standard automatic transmissions.

The EDC uses a dual dry clutch system: the first clutch covers the odd-number gears (1st, 3rd and 5th), while the second one deals with the even number ones (2nd, 4th and 6th) and the reverse one. Four shafts are used to carry the gears: two concentric primary ones, each connected to one of the two clutches and two secondary shafts. The gearbox uses synchronisers similar to those featured in manual transmissions. Both the synchronisers and the clutches are operated via electric actuators.

The driver can choose to leave the box in automatic adaptive mode or become a part of the shifting process, by switching to the “sequential” mode. The new transmission features a hill-start assist function.

The EDC offers a sift time of 290 milliseconds, can handle a maximum torque of 240 Nm and tips the scale at 82 kg. It will be introduced to the market on the 1.5 dCi 110 DPF diesel models of the Megane range. Subsequently, it will be offered on a wider range of Renault vehicles.

The company claims that the new gearbox will save around 30 grams of CO2 per km. The EDC-equipped Renault Meganes will be the first Renault vehicles equipped with automatic transmissions that will be entered into the eco2 “green” line-up.
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About the author: Andrei Tutu
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