2011 PORSCHE CAYENNE brake sensor

The sensors are used to measure
a range of values, including the
rotational speed of all four wheels,
the lateral and longitudinal
acceleration of the car, and
the current steering angle.
If, for example, the rear wheels
threaten to lose traction under
acceleration, a greater proportion
of drive torque is automatically
transmit ted to the front axle by a more positive engagement of
the multi-plate clutch. In addition,
ASR minimises wheel spin. During
cornering, the required level of
engine torque is distributed to the
front wheels to ensure excellent
lateral stabilit y.
In conjunction with advanced
Porsche Stabilit y Management
(PSM, p. 66), PTM ensures the
perfect distribution of drive
torque for optimum traction in all road scenarios, whether on
long straights, through tight cor-
ners or on surfaces with dif ferent
friction coef ficients. If one of the
wheels is about to lose traction,
PTM uses the ABD function to
apply the corresponding brake.
As a result, more drive is auto -
matically transferred to the op-
posite wheel. If both wheels on
one axle are in danger of slipping,
ASR immediately intervenes
and modifies engine output to maintain drive. As well as en-
hancing traction and active safety,
Porsche Traction Management
(PTM) of fers exceptional handling
and driving dynamics.
Standard on the Cayenne,
Cayenne S and Cayenne Turbo.
Torque is distributed bet ween the
front and rear axles by means of
the electronically variable multi-
plate clutch. For the toughest
off-road terrain, the differential
can be locked using the PTM
control on the centre console.
With the aid of on -board sensors,
the status of the car is continu-
ously monitored and the front /
rear split is adjusted to match
changing driving conditions.
Porsche Traction Management
(PTM) on the Cayenne,
Cayenne S and Cayenne Turbo.
Porsche Traction Management
(PTM) is an active all-wheel drive
system with an electronically
variable, map - controlled multi -
plate clutch, automatic brake
dif ferential (ABD) and anti-slip
regulation (ASR).
Intelligent, discreet, responsive.
The ideal travelling companion.
All -wheel drive on the Cayenne, Cayenne S and Cayenne Turbo
Drive systems and chassis | Transmission · 45

Making headway without getting in a spin.
An approach we thoroughly support.
Chassis.
outside rear wheel which supports
the steering motion of the car,
thereby improving its cornering
dynamics.
At slow and medium speeds, PT V
Plus considerably enhances agilit y
and steering precision. At high
speeds, during fast cornering and
under wheel spin, the electron-
ically controlled
rear differential
ensures additional stabilit y. Also
on variable-grip surfaces, in the
wet and on snow, PT V Plus –
combined with Porsche Traction
Management (PTM) and Porsche
Stabilit y Management (PSM) –
provides a major contribution to
active safety.In of f-road terrain, PT V Plus
reduces wheel spin on the rear
wheels – even when towing heav y
trailer loads. The electronically
controlled rear dif ferential can
be fully locked using the of f-road
control on the centre console.
Optional for the Cayenne,
Cayenne S and Cayenne Turbo.
Porsche Active Suspension
Management (PASM).
PASM is an electronic damping
control system. It of fers con-
tinuous adjustment of individual
damping forces based on current
road conditions and driving st yle.
During performance driving or
heav y of f-road use, there is an
increased tendency for the body
to sway. PASM prevents this from
happening, thereby improving
stabilit y and occupant comfort.
PASM has three setup modes:
‘Comfort ’, ‘Normal’ and ‘Sport ’. Whichever one you select, the
system uses a series of sensors
to monitor the movement of the
body. It also gathers data on
lateral acceleration, steering
angle, brake pressure and engine
torque and modifies the damping
force on each individual wheel
in accordance with the selected
mode.
PASM remains active at all times.
It automatically adapts to the
prevailing driving conditions,
enabling greater car control and
improving comfort and safet y.
Optional for the Cayenne,
Cayenne Diesel, Cayenne S
and Cayenne S Hybrid.
Standard on the Cayenne
Turbo: air suspension with
PASM.
yaw velocit y and vehicle speed,
PT V Plus optimises steering re-
sponse and precision by applying
brake pressure to the left or
right rear wheel, as required.
Specifically, this means that when
entering a corner at high speed,
moderate brake pressure is
applied to the inside rear wheel.
This transfers drive torque to the
Porsche Torque Vectoring Plus
(PTV Plus).
A system for enhancing driving
dynamics and stabilit y, PT V Plus
of fers variable distribution of
engine torque to the rear
wheels
and electronically con trolled
rear differential. Depending
on the steering angle, steering
speed, throt tle pedal position,
Porsche Active Suspension Management (PASM)
50 · Drive systems and chassis | ChassisDrive systems and chassis | Chassis · 51
Porsche Torque Vectoring Plus (PT V Plus)

All Cayenne models have internal-
ly vented discs all round, ensuring
consistent performance during
heav y use. The front disc dimen-
sions (diameter/thickness) are
350 mm/34 mm on the Cayenne
and Cayenne Diesel, 360 mm/
36 mm on the Cayenne S and
Cayenne S Hybrid, and 390 mm/
38 mm on the Cayenne Turbo.All models have six-piston
monobloc aluminium brake
calipers at the front and four-
piston equivalents at the rear.
The calipers are black on the
Cayenne and Cayenne Diesel
and silver on the Cayenne S
and Cayenne S Hybrid. On the
Cayenne Turbo, they feature a
striking red paint finish.
Braking is assisted by a tandem
booster and large brake master
cylinder. Further assistance is
provided by PSM (p. 66).
For greater safet y, the brake pads
are equipped with individual wear
sensors, alerting the driver when
new pads are required.
Electric parking brake.
Manually activated and deactivat-
ed, the electric parking brake
releases automatically as you drive
off.
Automatic hold function.
With the automatic hold function,
you can pull away on the flat or a
slope without ever rolling back.
The system automatically detects
when the vehicle has come to a
halt on an uphill gradient. PSM then
maintains the brake pressure at all
four wheels for a brief period to
prevent the vehicle from moving in
the opposite direction.
Braking systems.
Porsche brakes are renowned
worldwide as the benchmark
in performance and durabilit y.
Equipped with larger and more
powerful braking systems, the
Cayenne models continue this
tradition by offering excellent
deceleration – even when the
car is fully laden with five adult
occupants, a full complement
of luggage and a braked trailer
load of up to 3,500 kg (Cayenne
with manual gearbox: 2,700 kg).
Outstanding brake performance.
To the point.
Standard braking system
(Cayenne/Cayenne Diesel) Standard braking system
(Cayenne S/Cayenne S Hybrid) Standard braking system (Cayenne Turbo)
Safety and environment | Safet y · 63
62 · Safety and environment | Safet y

PSM has three additional func-
tions that help reduce braking
distances. If the throt tle pedal
is released suddenly, PSM
automatically readies the braking
system. The pressure in the
brake lines is marginally increased,
bringing each of the pads into
light contact with the correspond-
ing disc. If the driver goes on
to apply the brakes, the calipers
respond more quickly and the
braking distance is reduced. In an emergency stop – i.e. when
the pressure on the brake pedal
exceeds a certain threshold –
the brake assist function uses the
PSM hydraulics to apply maximum
braking force at all four wheels.
For added safet y, the system
also readies the brakes whenever
a decreasing distance to the
vehicle in front is detected. The
optional adaptive cruise control
and PSM interact to prefill the
brakes.
Even if adaptive cruise control is
inactive, the system registers the
speed of the vehicle in front and
automatically readies the braking
system. In addition, the system
alerts the driver to the decreasing distance by briefly tugging on
the brakes.
PSM also features a trailer
stabilisation function – for a
significant contribution to car
and trailer safet y.
Within the laws of physics, it
compensates for load transfer
caused by throt tle and brake
inputs up to the maximum degree
of lateral acceleration. It also en-
hances the car’s driving dynamics
and directional stabilit y when
accelerating on inconsistent road
surfaces.
Other features include a special
control strategy in the ABS
for braking on loose surfaces.
By briefly locking the wheels, a wedge is formed ahead of each
t yre which provides additional
purchase to help slow the car,
e.g. on gravel or snow.
For a more involving driving
experience, PSM can also be
disabled, but remains active in
the background.
Standard on all Cayenne
models.
accele ration of the car. Using
this information, it is possible to
calculate the actual direction of
travel at any given moment. If
the car begins to oversteer or
understeer, PSM applies selective
braking on individual wheels to
restore stabilit y. If necessar y,
PSM can also intervene in the
engine management system to
temporarily modif y the amount of
drive transmit ted to the wheels.
Porsche Stability Management
(PSM).
Porsche Stabilit y Management
(PSM) is an electronic control
system that uses a range of
functions – including anti-lock
braking (ABS) – to help stabilise
the vehicle (and trailer, if fit ted)
in hazardous road scenarios.
Throughout each journey, sensors
monitor the direction, speed,
yaw velocit y and lateral
Preparing for the road ahead.
With a little help from PSM.
Safety and environment | Safet y · 67

Adaptive cruise control.
Optional on all Cayenne models,
adaptive cruise control regulates
the speed of your vehicle in line
with that of the vehicle in front. To
do that, the system uses a radar
sensor in the central air intake
to monitor the road up to 200 m
ahead. If you approach another vehicle
that is travelling slower than
your selected cruising speed,

the system slows the engine or
gently applies the brakes. This
continues until the distance that
you have preset is maintained.
If heavier braking is required, the
driver has to actively intervene. Your vehicle will now follow the
one in front at a reduced speed.
If the other vehicle decelerates
further, adaptive cruise control
will continue to reduce your speed
– even down to a halt. When the
road ahead is free once more,
the car automatically returns
to your selected cruising speed bet ween 30 and 210 km/ h
(19 and 130 mph). To pull away
after an automatic stop, simply
use the control lever or depress
the accelerator pedal.
For added safet y, the system also
readies the brakes whenever a
decreasing distance to the vehicle
in front is detected. Adaptive
cruise control and PSM (p. 66)
interact to prefill the brakes.
The system visually and audibly
alerts the driver in the event
of a critical decrease in distance
and briefly tugs on the brakes.
Optional for all Cayenne
models.
Lane Change Assist (LCA).
Lane Change Assist (LCA )
monitors the area behind the
vehicle and the blind spot using
radar sensors. At speeds of 30 km/ h (19 mph) or
more, the system alerts the driver
of a vehicle in the blind spot or
approaching quickly from behind
via a visual signal from the
exter ior mirrors. This enhances
comfort and safet y, particularly
when driving on the motorway.
However, LCA does not actively
intervene in the
controlling of
the vehicle and can be deactivated
at any time.
Optional for all Cayenne
models.
Lane Change Assist (LCA)
Adaptive cruise control
Comfort and transport | Driver assistance systems · 105
104 · Comfort and transport | Driver assistance systems

Index
Index · 141
140 · Index
Drive systems 28
‘Coasting’ 23
Electric machine 28
Hybrid module 28
Parallel full hybrid 28
Performance 28

Engine technology 36
Air intake system 40
Auto start /stop function 36
Common-rail injection system 38
Cooling systems 38
Direct fuel injection (DFI) 38
Engine management
(electronic) 41
Exhaust system 41
Lubrication 39
Sports exhaust system 41
Supercharging system 40
Turbocharging systems 40
Variable Turbine Geometry
(V TG) 40
Variable valve timing 37
VarioCam Plus 37
Transmission 42
All-wheel drive 44
Anti-slip regulation (ASR) 44
Automatic brake dif ferential
(ABD) 44
Downhill assistance 47
Manual gearbox 42
Porsche Traction Management
(PTM) 44
Tiptronic S 42
Off-road capability 48
Chassis
50
Air suspension 52
Porsche Active Suspension
Management (PASM) 51
Porsche Dynamic Chassis
Control (PDCC) 53
Porsche Torque Vectoring Plus
(PT V Plus) 50
Self-levelling 52
Servotronic 55
Steering 55
Tyre Pressure Monitoring
( T PM) 57
Weight reduction 54
Wheels 56
Safety 58
Airbags 68
Automatic headlight
activation 60
Automatic hold function 63
Braking systems 62
Ceramic brakes 64
Cornering lights 61
Day time running lights 61
Headlights 60
Interior safet y features 68
Lighting 60
Parking brake (electric) 63
Porsche Ceramic Composite
Brake (PCCB) 64
Porsche Dynamic Light
System (PDLS) 61
Porsche Side Impact Protection
(POSIP) 68
Porsche Stabilit y Management
(PSM) 66
Recuperation 64
Seat belt system 69
Taillights 61
Environment 70
Exhaust emissions 72
Fuel economy 73
Fuel system 73
Ignition system 74Lightweight construction 70
Materials
75
Recycling 75
S e r v i c i n g 74

Comfor t 78
Anti-theft protection 99
Audio systems 88, 92, 94
Bluetooth
® 90
BOSE
® Surround Sound
System 92
Burmester
® High - End
Surround Sound System 94
CD/ DVD autochanger 88
Child seats 84
Climate control 96
Comfort memory package 82
Compass display 79
Driver memory package 82
Heat and noise-insulating
glass 97
Heated windscreen 97
Electronic logbook 90
Interior 79
Interior lighting 86
Mobile phone preparation 90
MP3 89, 91
Multifunction
steering wheel 79, 91
Navigation system 88
On-board computer 79 Panoramic roof system 100
Porsche Communication
Management (PCM) 88
Porsche Entry & Drive 98
Porsche Rear Seat
Entertainment
87
Porsche Vehicle Tracking
System (PV TS) 99
Privacy glass 97
Radio 88
Rain sensor 98
Seats 82
Storage compartments 86
S u n r o o f 10 0
Sunscreen 98
Telephone module 90
Touchscreen 88
T V tuner 91
Universal audio interface 91
USB port 91
Voice control 90
Water-repellent side windows 97

Driver assistance systems 102
Adaptive cruise control 104
Automatically dimming
mirrors 103
Comfort lighting package 102
Cruise control 103
Lane Change Assist (LCA) 105
P a r k A s s i s t 10 2
Reversing camera 102

Tr an s p o r t 10 6
Loading options 107
Loadspace management
s y s t e m 10 8
Luggage compartment 106
Ride-height control 106
Roof transport system 108
Tailgate (automatic) 106
Towbar systems 109
Personalisation 110
C o l o u r s 112
Exterior 112, 120
Interior 116, 124
Factory collection 129
Technical data 134