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PTM applies all engine power to
the road
In the new Cayenne S Diesel, the combination of a
powerful eight-cylinder and eight-speed Tiptronic S
has an ideal partner in the form of PTM active allwheel
drive. This Porsche Traction Management system
was specially configured for the sporty, highly dynamic
Cayenne models, because its broad range of
torque distribution offers benefits in terms of vehicle
dynamics, agility and traction pre-control and complements
the performance-oriented character of the cars.
PTM also has the automatic brake differential (ABD)
for improved traction control, anti-slip control (ASR)
for improved vehicle stability and a switchable hill control
assistant (Porsche Hill Control, PHC) for controlled
descents on steep hills.
Porsche Traction Management with active all-wheel
drive directly applies power to the rear axle. The extremely
compact transfer case of the all-wheel drive is a
so-called hang-on solution in a separate housing that
follows the transmission. The multi-plate clutch that
features electronic control by an electric motor regulates
the distribution of drive power to the front axle
with full variability, and there is no fixed base distribution.
If slip increases at the rear wheels, e.g. during
acceleration, a stronger response by the multi-plate
clutch distributes more power to the front wheels. By
permanently monitoring the driving state, the system
is able to react to different driving situations as well as
to driver wishes. This is enabled by auxiliary control of
the active all-wheel drive system that is tuned to vehicle
dynamics; it can react based on the driving situation
and even preventively – before undesirable slip occurs
at one axle. An example: When the driver steers into a
bend, the lateral guiding forces of the steered wheels
are increased by reducing the drive torque at the front
axle, which enables high levels of agility and transverse
acceleration. As the driver then accelerates out of the
bend, the drive torque is optimally distributed for maximum
traction at both axles.
Three offroad modes: offroad rocker switch
The wide-ranging offroad capabilities of the Cayenne S
Diesel can be modified over various stages by a central
offroad rocker switch on the centre console. All systems
are then optimised for offroad use, with the goal
of improving traction on unpaved surfaces. In offroad
mode 1, all relevant systems in addition to the hill
descent assist, such as ABS, are also switched to a traction-oriented
offroad mode. If the Cayenne S Diesel is
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