SSANGYONG REXTON 2006.09 Manual page 406

(5) Typical slip curves
The reason for this is based in physics and not in the Anti-Lock System. However, as
mentioned before, ABS is not about the stopping distance, but maneuverability and driving
stability, for with ABS you can steer round an obstacle. A device with locking wheels without
ABS cannot be steered. So what use then is the shorter stopping distance if the vehicle has
already hit the car in front, because you did not have a chance to steer round the obstacle?
(6) Kamm circle
For the various carriageway conditions the adhesion
coefficients were plotted. The typical course of the
curves is always the same. The only special feature
is shown by the curve for freshly fallen snow, for this
curve increases at 100 % slip. In a vehicle without
ABS, the wheel locks on braking and therefore
pushes a wedge before it. This wedge of loose
surface or freshly fallen snow means and increased
resistance and as a result the stopping distance is
shorter. This reduction in stopping distance is not
possible with a vehicle with ABS, as the wheel does
not lock. On these surfaces the stopping distance
with ABS is longer than without ABS.
Before we go into the Kamm circle, you should
know that a tire offers a maximum of 100 %
transmissibility. It is all the same for the tire
whether we require 100 % in the direction of
braking or in the direction of the acting lateral
force, e.g. when driving round curves. If we
drive into a curve too fast and the tire requires
100 % transmissibility as cornering force, the
tire cannot transmit any additional brake force.
In spite of the ABS the car is carried out of the
curve. The relationship between brake force B
and cornering force S is shown very clearly in
the Kamm circle. If we put a vehicle wheel in
this circle, the relationship becomes even
clearer. In this relationship: as long as the
acting forces and the resulting force remain
within the circle, the vehicle is stable to drive. If
a force exceeds the circle, the vehicle leaves
the road.
17-7
4892-01
ANTI-BRAKE SYSTEM
REXTON 2006.09