Loading ...
Loading ...
Loading ...
Porsche Stability Management
(PSM)
Gener al information regarding PSM
PSM is an ac tive control system for stabilizati on of
the vehicle during extreme driving maneuvers.
Warning!
Risk of an accident, resulting in serious
person al inju ry or death. The increased
control that is provide d should not induce
you to take greater risks with y our safety. The
limits dictated by the laws of p hysics c annot
be ov ercome, even with PSM. The risk of
accidents due to inappropriate speed cann ot
be reduced, even by PSM. The driver bear s
the responsibility for all driving maneuvers.
Adapt your driving st yle to the prevaili ng road
and weather conditions.
Obey all traffic laws.
Advantages of PSM
– Superio r tractio n and lane- holding ability in all
driving situat ions - even on road surfaces with
varying friction.
– The sy stem compensates for undesired vehi-
cle reaction s (Ferra ria effect) when the driver
releases the accelerator pedal or brakes on
bends. This compensation functions up to the
maximum later al acceleration.
– PSM actively stabiliz es the vehicle during
dynamic driving maneuvers ( e.g. rapid
steerin g movements, during lane c hanges
or on alternati n g curves).
– Improved braking stability in curves and on
different or varying road surfaces.
Readiness for operation
PSM is switched on automatically every time you
start the engine.
Function
Sensors at t he wheels, brak es, steering syst em
and engine continuously mea sure:
– Speed
– Direction of t ravel (steering angle)
– Lateral acceleration
– Rate of turn abo u t the vertical a xis
PSM uses these values to determine the direction
of travel desired by the driver. PSM inter venes and
corrects the course if the actual direction of motion
deviates from the desired course (steering-wheel
position): It brakes individual wheels as needed. In
addition, the engine power may be manipulated in
order to stabilize the vehicle.
The events below inform the drive r of PSM control
operations and warn him to adapt her/h is driving
style to the road conditions:
– The multi-functional information light on the
instrument panel flashes.
– Hydraulic noises can be heard.
– The vehicle decelerates and steering-wheel
forces are altered as the PSM c ontrols the
brakes .
– Reduce d engine power.
– The brake ped al pulsates and its position is
changed duri n g braking. In order to achiev e
full ve hicle deceleration, foot pressure must be
increased after beginning of the brake peda l
pulsing.
Examples of PSM control operations
– If the front wheels of the vehicle drift on a bend,
the rear wheel on the inside of the bend i s
braked and the engine power is reduced if
necessary.
– If the rear of the vehicle swings out on a bend,
the front wheel on the outside of th e bend is
braked.
Controls, In s truments
71
Downloaded from www.ManualsFile.com manuals search engine
Loading ...
Loading ...
Loading ...