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Driving and Driving Safety 135
Despite the advantages of transmission and
chassis control systems, it is still the driver’s
responsibility to adapt his driving style and
maneuvers in line with road and weather
conditions, as well as the traffic situation.
The increased safety that is provided should not
induce you to take greater risks with your safety.
The limits set by the physics of driving cannot be
overcome.
These systems cannot reduce the risk of
accidents due to inappropriate speed.
f Adapt your driving style, maneuvers and speed
to the road and weather conditions, as well as
the traffic situation.
Porsche Stability Management
(PSM)
PSM is an active control system for stabilization of
the vehicle during extreme driving maneuvers.
PSM makes use of both the automatic brake
differential (ABD) and anti-slip regulation (ASR)
systems, as well as the functions of the anti-lock
brake system (ABS) and engine drag torque
control system (MSR).
In spite of the advantages of PSM, it is still the
driver’s responsibility to adapt his driving style and
maneuvers in line with road and weather
conditions, as well as the traffic situation.
The increased safety that is provided should not
induce you to take greater risks with your safety.
The limits set by the physics of driving cannot be
overcome, even with PSM.
Risk of accidents due to inappropriate speed
cannot be reduced by PSM.
Advantages of PSM
– Best possible traction and lane-holding ability –
even on road surfaces with varying friction.
– The system compensates for undesired
vehicle reactions (Ferraria effect) when the
driver releases the accelerator pedal or brakes
on bends. This compensation functions up to
the maximum lateral acceleration.
– PSM actively stabilizes the vehicle if necessary
during dynamic driving maneuvers (e.g. rapid
steering movements, during lane changes,
or on alternating bends).
– Improved braking stability on bends and on
different or varying road surfaces.
– Improved brake function and shorter stopping
distance in the event of emergency braking.
Readiness for operation
PSM is switched on automatically every time you
start the engine.
Function
Sensors at the wheels, brakes, steering system
and engine continuously measure:
– Speed
– Direction of travel (steering angle)
– Lateral acceleration
– Axial acceleration
– Rate of turn about the vertical axis
PSM uses these values to determine the direction
of travel desired by the driver.
PSM intervenes and helps to correct the course if
the actual direction of motion deviates from the
desired course (steering-wheel position):
It brakes individual wheels as required.
If necessary, PSM also influences the engine
power.
The events below inform the driver of PSM control
operations and warn him to adapt his driving style
to the road conditions:
– PSM warning light on the instrument panel
flashes.
– Hydraulic noises can be heard.
– The vehicle decelerates and steering-wheel
forces are altered as PSM controls the brakes.
– Reduced engine power.
– The brake pedal pulsates and its position is
changed during braking.
In order to achieve full vehicle deceleration,
foot pressure must be increased after the
brake pedal has begun vibrating.
Driver responsibility
WARNING
h
Loss of control over the
vehicle
WARNING
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