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Cayenne

2012-2016 911 – Manual

2012-2016 911 – Manual

Page: 160

Driver Responsibility

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.

  • 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).

Loss of control over the vehicle

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 in all driving situations – 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 helps to stabilize the vehicle if necessary during dynamic driving manoeuvres (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 corrects 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 or the gear-changing characteristic of Porsche Doppelkupplung (PDK) in order to stabilize the vehicle.

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