BMW x5 2001 ユーザーズマニュアル

200

Rain sensor

Front axle

The rain sensor controls windshield
wiper operation, depending on how wet
the windshield is.

Infrared light is carried along the
surface of the windshield in an optical
conductor in such a manner that it is
reflected completely when the wind-
shield is dry. The quantity of reflected
light is measured.

If the window is covered with beads of
water, the amount of light that is
reflected is decreased since the
infrared light at the surface of the wind-
shield can then escape. The quantity of
reflected light is thus a means of
gauging the degree of wetness on the
windshield.

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When the system is set to the "Intermit-
tent" wiper speed, the wipers react
immediately — if water is splashed onto
the windshield by vehicles traveling
ahead of you, for example. As a result,
the rain sensor provides a contribution
to driving safety and comfort.

The double-jointed suspension strut
axle is based on the same concept as
the one in the 7 Series, but was totally
re-developed because of the require-
ments for all-wheel drive. Parts
subjected to particularly high stress
levels for guiding the wheels are
designed as steel-forged parts to meet
the demands made by rougher roads.
The load-bearing front axle has large-
volume, hydraulically cushioned rubber
bearings that allow the axle to absorb
the reactive forces from the engine and
the braking forces from the front
wheels. An integrated rigid plate over
the load-bearing front axle provides
superb support against the lateral
forces introduced by the control arm
(wishbone), and also serves as an
effective protective barrier for the oil
pan and steering.

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