Distronic Plus Including Bas Plus And Pre-Safe® Brake - Mercedes-Benz Series 218 Coupe Introduction Into Service Manual

DISTRONIC PLUS including BAS PLUS and PRE-SAFE® brake
The DISTRONIC PLUS driver assistance system
(code 233) automatically regulates the vehicle
speed and distance to the vehicle in front as speci-
fied by the driver in the speed range of v = 0 to
200 km/h and v = 200 to 0 km/h.
®
The PRE-SAFE brake continuously evaluates the
risk of a rear-end collision and, in critical situations,
initiates appropriate measures for collision warning
and, if necessary, to reduce the severity of the colli-
sion.
The BAS PLUS function (Brake Assist System
PLUS), assists the driver through situation-depen-
dent, targeted brake force calculation during emer-
gency braking.
DISTRONIC PLUS
DISTRONIC PLUS uses the short-range radar
sensor system integrated in the bumper and the
long-range radar installed in the radiator grille in
order to detect vehicles and obstacles ahead of the
vehicle.
The DISTRONIC PLUS functions are controlled by
the video and radar sensor system control unit,
which actively intervenes in the engine control
system and brake system for this purpose. In addi-
tion, it controls the instrument cluster to output
visual and acoustic warning messages.
Due to legal requirements related to the 24-GHz
radar system, the short-range radar sensor system
is shut off in certain protected zones around radio
astronomy stations. The protected zones are stored
in the video and radar sensor system control unit in
the form of Global Positioning System (GPS) coordi-
nates.
The current GPS coordinates received by the navi-
gation system are transmitted via the front SAM
control unit to the video and radar sensor system
control unit. This shuts off the short-range radar
sensor system when the vehicle is in a protected
zone.
If DISTRONIC PLUS is active, the message "Radar
sensor system autom. shut off see operating
instructions" is displayed on the multifunction
display.
– This printout will not be recorded by the update service. Status: 09 / 2010 –
When the vehicle leaves the protected zone, the
short-range radar sensor system is switched back
on. If DISTRONIC PLUS is active, the message
"DISTRONIC PLUS available again" is displayed.
In vehicles for Australia, the radar sensor system
must be manually switched off and back on via the
onboard computer.
The long-range radar operates in the 77 GHz
frequency range, and at a detection angle of 18°,
monitors the area in front of the vehicle up to a
distance of 60 to 200 m. The area from 0 to 60 m in
front of the vehicle is monitored at an angle of 60°.
The long-range radar operates using the Pulse-
Doppler principle. This allows distances and speeds
of individual objects to measured independently of
each other.
The maximum positive acceleration for automatic
distance control which can be requested by the
system is limited to approx. 2.5 m/s
comfort-related reasons, the negative acceleration
is limited to 40% of the maximum possible braking
power.
DISTRONIC PLUS display
1 Distance warning readiness indicator
2 Vehicle in front (target object)
3 Specified distance
4 Own vehicle
Introduction of the New CLS-Class, Model Series 218 Coupe
2
for safety and
P54.32-8996-00
107
b