AMG RIDE CONTROL sports suspension including air
suspension
ACTIVE CURVE SYSTEM for active roll stabilisation
Permanent all-wheel drive with 40 : 60 power distribution
AMG speed-sensitive sports steering and AMG
high-performance braking system
The driving feel in the ML 63 AMG is characterised by
effortless superiority, thrilling driving dynamics and
hallmark Mercedes comfort - thanks largely to the powertrain
as well as the chassis, steering and braking system. Only the
range-topping AMG model features the exclusive combination of
AMG RIDE CONTROL sports suspension with AIRMATIC package,
Adaptive Damping System (ADS) and ACTIVE CURVE SYSTEM as
standard.
The double-link front suspension and multi-link rear
suspension are equipped with AMG-specific air spring struts,
while the fully load-bearing air suspension system is
speed-sensitive. At speeds above 70 km/h, the body is lowered
by ten millimetres to reduce drag and increase driving
stability. When the suspension is in "Sport plus"
mode, the body is 10 millimetres lower than in
"Comfort" or "Sport" mode. What's
more, the AIRMATIC package compensates for variations in the
vehicle load and driving conditions and also functions as a
level control system. Away from the road, the air suspension
allows additional ride heights to enhance off-road capability
- the ground clearance can be increased by up to 60
millimetres. The driver can raise or lower the body at any
time whilst the engine is running using the rotary control in
the centre console.
Adaptive Damping System (ADS) with "skyhook"
algorithm
The Adaptive Damping System (ADS) adapts the damping forces
at each wheel based on the current requirements. Depending on
the driving situation, it reduces the body movement caused by
the wheels using a "skyhook" algorithm so as to
ensure optimum ride comfort and outstanding handling safety.
This adaptation takes place extremely quickly and fully
automatically, although there is a switch which allows the
driver to set the damper characteristics manually.
On the ML 63 AMG, the air suspension and the Adaptive Damping
System work closely together with the ACTIVE CURVE SYSTEM.
Active anti-roll bars on the front and rear axles control the
body roll automatically depending on the lateral
acceleration, road speed and the position of the switch
("Comfort", "Sport" or "Sport
plus"). The ACTIVE CURVE SYSTEM compensates for the roll
angle of the body through bends, so delivering significant
improvement in both agility and driving pleasure. At the same
time the system increases driving stability and thus safety,
especially and importantly at high speeds. Improved ride
comfort both on winding stretches of road and on the straight
is a further benefit of the ACTIVE CURVE SYSTEM. The control
strategies in detail:
Comfort is improved when driving straight ahead as the
rotary actuators decouple the two halves of the front and
rear anti-roll bars in this situation, meaning that the
anti-roll bars are "open" and do not react to a
stimulus
on just one side, such as bumps or potholes.
Increased ride comfort and more dynamic handling when
cornering, because the system actively influences the
anti-roll bars' torsional moments and twisting
angles. The anti-roll bars' torsional moment
furthermore remains constant in response to a stimulus on
one side, such as is the case when driving over a pothole
on the outside of the bend. Thanks to the individual
control at the front and rear axles, distribution of the
roll momentum can be varied, allowing the self-steering
properties to be actively adapted to the prevailing
driving situation. The handling characteristics are
adjusted for extra agility when driving along country
roads and for even greater stability on the motorway. To
enhance driving dynamics, the ML 63 AMG has a larger
anti-roll bar on the rear axle.
The key componentry of the ACTIVE CURVE SYSTEM comprises a
belt-driven hydraulic pump and an oil reservoir in the engine
compartment, as well as a valve block and active anti-roll
bars at both the front and rear axles. In contrast to a
passive anti-roll bar, the active variant is split into two
in the middle, and the two halves are connected with one
another by means of hydraulic rotary actuators. Using the CAN
signals relayed to it by pressure sensors and a lateral
acceleration sensor, the electronic control unit regulates
the hydraulic pressure.
The complex workings of the ACTIVE CURVE SYSTEM
The hydraulic pump feeds oil to the system from the oil
reservoir. The pressure control valves and directional
control valves integrated into the valve blocks at the front
and rear axles set the desired pressure and twist the active
anti-roll bars in the appropriate direction for the driving
situation. Inside the hydraulic rotary actuators that are
built into the active anti-roll bars there are six oil-filled
chambers, three of which are pressurised for each direction
of travel, i.e. a left or right-hand bend. The front valve
block additionally assumes the task of distributing the oil
flow between the two axles, irrespective of load.
40 : 60 power distribution
As on the previous model, a specially designed transfer case
distributes the engine power to the front and rear axle at a
ratio of 40 : 60. This rear-heavy power distribution enhances
agility when cornering at speed. The transfer case in the
4MATIC permanent all-wheel-drive system is directly
flange-mounted on the 7G-TRONIC.
Variable: AMG speed-sensitive sports steering
The high level of agility is also down to the new
electromechanical AMG speed-sensitive sports steering. With
its variable servo assistance which adapts to the current
suspension mode, it makes for extremely dynamic handling on
bends. In suspension mode "C" or "S", the
AMG speed-sensitive sports steering has a comfortable feel,
providing a higher level of steering assistance. In
"S+" mode, on the other hand, the driver will
discern stiffer, more sporty steering assistance with higher
steering torque - for enhanced response and steering
precision.
In addition to more precise steering and a more comfortable
feel at the wheel, the new electromechanical power steering
offers a range of additional advantages. Power assistance
remains available when the engine is stationary, for example
- whereby an algorithm ensures that the engine is not
prompted to start up in ECO start/stop mode when the driver
is merely moving the steering wheel while the vehicle is at a
standstill. The new steering system has also enabled
implementation of the "Active Parking Assist"
automatic parking function. In addition, the
electromechanical AMG speed-sensitive sports steering also
makes an important contribution to efficiency, since the
steering assist function only requires power when the driver
actually steers. This enables further potential fuel savings
to be achieved.
In the new steering system the steering gear and the
supporting servo-motor form a single compact unit and are
mounted as previously on an extremely rigid and lightweight
integral support frame, made of high-strength steel, which is
positioned in front of the wheel's centre line. The
high-performance control unit processes a variety of
parameters captured by the sensors - including vehicle speed,
steering angle, steering angle speed, lateral acceleration
and also understeer/oversteer characteristics - and in a
split second calculates the forces which the driver needs to
input into the steering in different driving situations -
from parking to high-speed motorway driving. Active damping
enhances the feeling of safety when driving straight ahead at
high speed. What's more, the AMG-specific
elastokinematics at the front axle make for improved steering
precision.
AMG high-performance braking system, 265/45 R 20 tyres
The new AMG high-performance braking system minimises
stopping distances, optimises sensitivity and offers high
resistance to fading. Ventilated and perforated brake discs
all round - 390 x 36 mm (front) and 345 x 26 mm (rear) -
ensure optimum thermal capability and outstanding
deceleration. Six-piston fixed callipers are fitted at the
front axle, while the rear axle has single-piston combined
floating callipers. If the AMG Performance package is
ordered, all the callipers are painted red. Start-off assist
and the HOLD function make hill-starts easier for the driver.
Standard equipment for the ML 63 AMG includes 5-spoke AMG
light-alloy wheels in 9 x 20 format. The wheels, painted
titanium grey with a high-sheen finish, are shod with 265/45
R 20 tyres. Exclusive optional extras from the AMG
Performance Studio include 295/35 R 21 tyres on 5-twin-spoke
AMG light-alloy wheels in 10 x 21 format.
4ETS, DSR und ESP® trailer stabilisation
Unlike the other M-Class versions, the ML 63 AMG is not
available with the ON&OFFROAD package. Nevertheless, the
range-topping model is well equipped for light off-road use.
The electronic traction system 4ETS in combination with ASR
(acceleration skid control) provides good grip, even
on slippery surfaces, while the standard-fit DSR (Downhill
Speed Regulation) automatically keeps the vehicle at the
speed programmed using the cruise control stalk.
ESP® trailer stabilisation offers customers who order the
optional trailer coupling increased safety when towing a
trailer: this additional ESP® function detects the trailer
when the electrical connector plug is connected to the towing
vehicle. ESP® trailer stabilisation uses the ESP® sensors and
counteracts possible "fishtailing" of the trailer
at speeds above 65 km/h by applying the brakes alternately on
the individual front wheels. In most cases, this braking is
sufficient to completely eradicate the fishtailing and so
prevent further danger. In the event of excessive
fishtailing, however, the engine torque is also reduced, and
the vehicle is braked at all four wheels so as to reduce the
speed from the critical level as quickly as possible.
The towing capacity of the ML 63 AMG is 3050 kg (braked) or
750 kg (unbraked).
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