Siemens EA6**GE Series, Instructions For Installation And Use Manual

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All-wheel drive
Performance | Transmission
Fitted as standard in the new
Panamera 4, the Panamera 4S
and the Panamera Turbo, Porsche
Traction Management (PTM) com-
prises an active all-wheel drive
with electronic and mapcontrolled
multiplate clutch with automatic
brake differential (ABD) and anti-
slip regulation (ASR). The electronically controlled multi-
plate clutch regulates the distri-
bution of drive force between the
permanently driven rear axle and
the front axle.
Through continuous monitoring
of the driving conditions, the elec-
tronics are able to respond to a
variety of situations. Sensors
check, among other variables, the
rotation speeds of all four wheels,
the longitudinal and lateral accel-
eration of the vehicle, and the
steering angle.
If the rear wheels threaten to
spin under acceleration, a greater
proportion of drive force is distrib-
uted to the front by a more power-
ful engagement of the multiplate
clutch. In addition, ASR reduces
wheel slip. When cornering, the
front wheels only ever receive as
much drive force as is necessary
to maintain optimum lateral
stability. In this way, PTM, in conjunction
with Porsche Stability Management
(PSM, p. 72), ensures that the
perfect distribution of drive is
achieved every time: whether on
long straights, through tight cor-
ners, or on surfaces with different
friction coefficients. In this situa-
tion, traction is additionally enhanced by the automatic brake
differential (ABD).
Whenever the brake control
systems are required to intervene,
PTM decouples the front axle
completely so that PSM interven-
tions can take place at each
individual wheel.
You always like to have your feet firmly planted on the ground.
With all-wheel-drive, the principle is the same.
Porsche Traction Management (PTM).