43
Glossary
O
Fatigue Detection
The driver Fatigue Detection system automatically analyses the driving characteristics and
if they indicate possible fatigue, recommends that the driver takes a break. The system
continually evaluates steering wheel movements along with other signals in the vehicle on
motorways and others roads at speeds in excess of 65 km/h, and calculates a fatigue
estimate. If fatigue is detected, the driver is warned by information in the Multi-function
Display and an acoustic signal. The warning is repeated after 15 minutes if the driver has
not taken a break.
Fatigue Detection cannot replace the driver’s assertiveness. The driver is still legally responsible for the vehicle
and therefore determining whether or not they are fit to drive. A driving time of 15 minutes is required in order to
assess the driver correctly. The functionality of the system is restricted given a sporty driving style, winding roads
and poor road surfaces.
Electronic Brake-pressure Distribution (EBD)
Electronic, more sophisticated means of regulating the ratio of front/rear brake pressure.
Settings are varied according to driving and load conditions to ensure each wheel is
braked to the optimum extent.
Electronic Differential Lock (EDL)
EDL improves driving and steering characteristics when accelerating on road surfaces
where each wheel has a different degree of traction. The system operates automatically
and is combined with the ABS system. Using the ABS wheel sensors, EDL monitors the
speed of the individual driving wheels. When a difference in driving wheel speed is
detected (i.e. when one wheel starts to spin due to differences in road surfaces, e.g. due
to water or dirt) the system brakes the spinning wheel, transferring engine power to the
wheel with the best traction.
Electronic Stabilisation Program (ESP)
ABS and ASR traction control systems are integrated into the Electronic Stabilisation
Program (ESP). In short, ESP helps ensure that the vehicle goes where you steer it even in
extreme driving conditions. The ESP system constantly compares the actual movement of
the vehicle with pre-determined values and should a situation arise where the vehicle
starts to skid, ESP will apply the brakes to individual wheels and automatically adjust the
engine’s power output to correct the problem. ESP prevents the vehicle from losing
control when trying to avoid an accident, for example. It also reduces the effects of
understeer or oversteer.
Extended Electronic Differential Lock (XDL)
XDL is an extension of the Electronic Differential Lock (EDL) function. When cornering,
XDL responds to the load relief at the front wheel on the inside of a corner. The ESP
hydraulics are used for the XDL to apply pressure to the wheel on the inside of the corner
in order to prevent wheel spin. This improves traction and reduces the tendency to
understeer. As a direct result of the one-sided and precise braking pressure, cornering
is sportier and more accurate.
Front Assist with City Emergency Brake (City EB) function
O
The Front Assist ambient traffic monitoring system uses a radar sensor to detect critical
distance situations and thus help to shorten the braking distance, reducing the risk of a
rear-end collision.
The traffic ahead is monitored constantly by the radar at the front. If a vehicle is detected
ahead of you in the lane, the distance and the speed relative to it are calculated. If the gap is
closing too fast, Front Assist initially warns the driver by means of an audible as well as a
visual signal. At the same time, the brake pads are brought into contact with the brake discs
and the sensitivity of the Brake Assist is increased. This primes the braking system for a
possible emergency stop. Furthermore, an automatic jolt of the brakes warns the driver
of the danger. If the driver also fails to react to the warning jolt, Front Assist brakes
automatically, helping to avoid a collision or reduce the severity of the accident.
The City Emergency Brake (City EB) function is a radar based emergency braking system
designed to help a driver avoid a low-speed crash or to reduce its severity. At vehicle speeds
below 30km/h, City EB monitors the area ahead of the car for vehicles which might present a
threat of collision. If a collision is likely, City Emergency Braking first pre-charges the brakes
and makes the emergency Brake Assist system more sensitive: if the driver should notice the
risk, the car is ready to respond more quickly to their braking action. However, if the driver
still takes no action and a collision becomes imminent, City Emergency Braking
independently applies the brakes very hard. If the driver intervenes to try to avoid the
accident, either by accelerating hard or by steering, City EB will deactivate and allow the
driver to complete the avoidance manoeuvre.
Front Assist with City Emergency Brake (City EB) cannot replace the driver’s assertiveness. The driver is still
legally responsible for the vehicle and must monitor the speed and distance in relation to other vehicles.
Glossary
