The new “AT6” automatic gearbox has been developed by “Aisin AW” to specifications defined by the PSA Peugeot Citroën group. Close in engineering terms to the “AM6” (fitted to the group’s most powerful HDi diesel engines – V6 HDi, 2.2 litre and 2.0 litre HDi), this new gearbox is designed to withstand a maximum torque of 300 Nm (450 Nm for the AM6).
Lighter and even more compact than the AM6, the AT6 has been designed to reduce the vehicle’s fuel consumption and CO2 emissions, (around 7% less than the previous model). It also benefits from a more efficient torque converter and a significant reduction in internal friction losses.
Particular attention has also been paid to the quality and speed of the gear changes in terms of smoothness, synchronisation and responsiveness.
The chosen gearbox gear ratios ensure good responsiveness when pulling away, excellent continuity when accelerating thanks to the smoothness of the gear changes and an all-round ease of use linked to optimisation of the engine’s torque range, which is particularly generous in this respect. The gearbox control system management of all the six gears optimises fuel consumption as the user is able to drive more often at low engine speeds, while the high ratio sixth gear optimises fuel consumption and engine noise levels on motorways.
Two driving modes are possible: automatic, for quiet, stress-free driving which adapts to the user’s driving style, and a more active mode thanks to the sequential selection control.