BMW 640i Bedienungshandbuch PDF herunterladen (Seite 130)

▷ PreCrash

▷ PostCrash

Attentiveness assistant

The concept

The system can detect increasing lack of alert‐

ness or fatigue of the driver during long, mo‐

notonous journeys, e.g., on highways. In this

situation, it is recommended that the driver

takes a break.

Note

Personal responsibility

The system cannot act as a substitute for

the personal assessment of one's physical

state and may not detect an increasing lack of

alertness or fatigue or may not detect it cor‐

rectly. Therefore, make sure that the driver is

rested and alert; otherwise, risks may be de‐

tected too late and an accident be caused as a

result.◀

Function

The system is activated each time the engine

is started and cannot be switched off.

After travel has begun, the system is trained

about the driver, so that increasing lack of

alertness or fatigue can be detected.

This procedure takes the following criteria into

account:

▷ Personal driving style, e.g., steering behav‐

ior.

▷ Driving conditions, e.g., length of trip.

Starting at approximately 43 mph/70 km/h, the

system is active and can display a recommen‐

dation to take a break.

Break recommendation

If the driver becomes increasingly less alert or

fatigued, a message is displayed in the Control

Display with the recommendation to take a

break.

A recommendation to take a break is displayed

only once during an uninterrupted trip.

After a break, another recommendation to take

a break cannot be displayed until after approxi‐

mately 45 minutes.

System limits

The function may be limited in the following

situations, for instance, and will either output

an incorrect warning or no warning at all:

▷ When the clock is set incorrectly.

▷ When the vehicle speed is mainly below

about 43 mph/70 km/h.

▷ With a sporty driving style, such as during

rapid acceleration or when cornering fast.

▷ In active driving situations, such as when

changing lanes frequently.

▷ When the road surface is poor.

▷ In the event of strong side winds.

PreCrash

The concept

With this system critical driving situations that

might result in an accident can be detected

above a speed of approx. 20 mph/30 km/h. In

these situations, preventive measures are au‐

tomatically taken to minimize the risk of an ac‐

cident as much as possible.

Critical driving situations may include:

Emergency stop.

If the vehicle includes the front-end collision

warning or front-end collision warning with

braking feature, impending collisions with vehi‐

cles driving ahead or stopped in front of you

can also be detected within the system's

range.

Seite 126

Controls Safety

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