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EnglishAdvanced technology -> Adaptive Transmission Control (ATC) for your BMW 7 Series 2001-2007
188nAirbags
ATC
The airbags located under the marked
covers inflate and unfold in a matter of
a few milliseconds. In this process, they
tear through the designed separation
points of the upholstered covers or
press them out.
ATC
Because the inflation process must be
virtually instantaneous, it is necessarily
accompanied by a certain amount of ig-
nition and inflation noise. The gas re-
quired to inflate the airbags is not dan-
gerous, and the smoke caused by it
rapidly dissipates.
Deceleration sensors continuously
On vehicles with automatic transmis-
sion Adaptive Transmission Control
(ATC) uses a number of factors to cal-
culate the maximally efficient gear. In
this process it monitors your personal
driving style, the situation in which you
are driving, the condition of the road
and the traffic conditions.
monitor the physical forces acting upon
the vehicle. In a severe frontal collision,
the gas generators of the driver's airbag
and the front passenger airbag are ig-
nited. However, the passenger-side air-
bag is only triggered if an additional
sensor has recognized that the passen-
ger seat is occupied.
The entire process is completed within
fractions of a second.
ATC recognizes your personal driving
style from the positions and movements
of the gas pedal, declaration when
braking and lateral acceleration through
curves. Four shift characteristics – from
comfort-oriented to performance-ori-
ented – are available for selection by
ATC.
In the event of a severe side impact, the
head protection and side airbags in the
front and/or rear* are triggered.
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
ATC
ASC+T/DSC
189n
In order to take driving conditions into
account, ATC registers corners and
both uphill and downhill gradients. For
By recognizing traffic conditions, ATC
can retain maximum driving comfort.
For instance, the system recognizes
Precision sensors monitor the wheel
speeds. The DSC also monitors steer-
ing angle, lateral acceleration, brake
pressure and the movement of the vehi-
cle around its vertical axis.
example, if you maintain speed through stop-and-go traffic and then proceeds
a curve, the transmission does not up-
shift.
only in second gear until it encounters
higher starting loads.
If differences in wheel speeds occur,
On uphill gradients, it shifts only when
the engine speed increases in order to
make more efficient use of power re-
serves. On downhill gradients, ATC
shifts down when the speed of the vehi-
cles increases, causing the driver to
step on the brakes.
Of course, the selector lever can still be the system recognizes the danger of
used to select specific gear ratios. Per- wheelspin and reduces the engine's
formance-oriented driving is enabled by drive torque. If necessary, the system
shifting from drive position "D" to "S,"
"3" or "2." Positions "3" and "2" each
limit upshifts to the next gear. Posi-
tion "2" is best for driving on steep
mountain slopes with a heavy load.
also responds with additional braking
intervention at all four wheels.
In addition, DSC permanently monitors
the vehicle's current operating condi-
tion and compares it with an ideal con-
dition that is calculated from the sensor
signals. If discrepancies from this ideal
condition (understeering or oversteer-
ing, for example) occur, DSC stabilizes
the vehicle in fractions of a second by
reducing engine power output and with
the assistance of braking intervention at
individual wheels. Dangerous skids are
thus prevented from the very beginning.
With respect to road conditions, ATC
monitors the friction between the tires
and the road. The system responds to
slippery road surfaces (snow and ice)
by activating the winter program.
Second gear is used when moving
away from a standstill, upshifts occur
sooner. On descents, downshifting
does not occur in spite of the applica-
tion of brakes. This enables you to
"feel" the road as you drive and pro-
duces greater dynamic stability. If the
friction between the tires and the road
is adequate, the normal system is again
activated. The system also leaves the
winter program when you shift from
drive position "D" to "S," "3" or "2," or if
the ASC+T/DSC* is deactivated.
You may need some time to become
accustomed to this system intervention.
However, it helps provide optimum pro-
pulsive force and driving stability.
The braking intervention may be ac-
companied by a certain degree of
noise.
Online Edition for Part No. 01 41 0 004 597 - © 08/99 BMW Group
