Advanced technology for Your BMW Z3 SUV First Generation (1995-2002)

163n  
Adaptive Transmission Control  
(ATC) 164  
Airbags 164  
Overview  
Automatic Stability Control plus  
Traction (ASC+T)/Dynamic  
Stability Control (DSC) 165  
Car radio reception 166  
Safety belt tensioner 166  
Controls and features  
Operation, maintenance  
Owner service procedures  
Advanced technology  
Technical data  
Index  
Technology  
 
164nATC*  
Airbags  
In order to take driving conditions into  
account, ATC registers corners and  
both uphill and downhill gradients. For  
example, if you maintain speed through  
a curve, the transmission does not  
upshift.  
On uphill gradients, it shifts only when  
the engine speed increases in order to  
make more efficient use of power  
reserves. On downhill gradients ATC  
downshifts when the speed of the vehi-  
cles increases causing the driver to  
step on the brakes.  
For vehicles with automatic transmis-  
Deceleration sensors continuously  
monitor the physical forces acting upon  
the vehicle. In the event of a severe  
frontal impact, the gas generators of  
the driver and passenger-side front  
airbags are ignited simultaneously.  
However, the passenger-side airbag is  
only triggered if an additional sensor  
has recognized that the passenger seat  
is occupied.  
sion, Adaptive Transmission Control  
(ATC) performs the optimum gear selec-  
tion based on a number of factors. This  
system reacts to your individual driving  
style and the current driving conditions.  
The ATC recognizes your individual  
driving style from the positions and  
movements of the accelerator pedal,  
delays during braking, and the vehicle's  
lateral acceleration when cornering.  
ATC makes the appropriate selection  
from different shift characteristics  
which range from comfort-oriented to  
performance-oriented.  
If it is necessary during a side impact, a  
side airbag will be triggered on the side  
where the collision occurs.  
 
Airbags  
ASC+T/DSC*  
165n  
The airbags located under the marked  
covers inflate and unfold in a matter of  
a few milliseconds. In this process they equipped with DSC, they also monitor  
Precision sensors monitor the number of You may need some time to become  
revolutions of the wheels. When  
accustomed to this system's interven-  
tion. However, it provides optimum  
propulsive force and driving stability.  
tear through the designed breaking  
points of the upholstered covers or  
press them out.  
steering angle, lateral acceleration,  
brake pressure and the movement of the  
vehicle around its vertical axis.  
The braking intervention may be accom-  
panied by a certain degree of noise.  
Because the inflation process must be If differences in the wheel speeds occur,  
virtually instantaneous, it is necessarily ASC+T recognizes the danger of wheel-  
accompanied by a certain amount of  
ignition and inflation noise. The gas  
required to inflate the airbags is not  
dangerous, and it dissipates together  
with the associated smoke.  
spin and reduces the drive torque. If  
necessary, the system also responds  
with additional applications of the brakes  
at the rear wheels.  
In addition, DSC permanently monitors  
The entire process is completed within the vehicle's current operating condition  
fractions of a second.  
and compares it with an ideal condition  
that is calculated from the sensor's  
signals. If deviations from this occur  
(understeering or oversteering, for  
instance), DSC can stabilize the vehicle  
in fractions of a second by adjusting  
engine output and with the assistance of  
braking intervention at individual wheels.  
Within physically possible limits  
dangerous skids can be prevented even  
as they are just beginning.  
 
166nCar radio reception  
Safety belt tensioner  
The AM frequency bands (medium- The safety belt tensioner responds to  
wave, long-wave and short-wave) make severe collisions by tightening the belts  
it possible to receive stations from a to ensure that occupants remain firmly  
great distance, because the broadcast positioned in their seats. A gas-pres-  
signals travel not only along the ground sure system retracts the buckle  
as surface waves, but also as atmo-  
spheric waves that are reflected from  
the ionosphere.  
assembly to tension the shoulder and  
lap belts within fractions of a second.  
This tends to further reduce the  
tendency to slide under the lap belt.  
Frequency-modulation (FM) provides  
substantially better sound quality than  
AM. However, because FM transmis-  
sions rely on line-of-sight broadcast  
waves, their effective reception range  
is limited.  
The limitations which are inherent to  
radio reception in a moving vehicle  
have been minimized by the use of  
innovative systems.