SSANGYONG Korando 2012 Manual page 966

▶ KAMM circle
▶ Brake and cornering force
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.
- Brake force
When depressing the brake pedal the brake
force increases to the maximum, then the
brake force decreases until the wheel locks.
- Cornering force
The cornering force is a maximum when the
wheel is turning freely with zero slip. When
braking the cornering force falls to zero if the
wheel locks (slip 100 %).
- ABS operating range
The operating range starts just before the
maximum brake force and ends in maximum,
for the unstable range then begins, in which
no further modulation is possible. The ABS
controls the regulation of the brake pressure
so that the brake force only becomes great
enough for a sufficient proportion of cornering
force to remain. With ABS we remain in the
Kamm circle as long as the car is driving
sensibly. We will leave driving physics with
these statements and turn to the braking
systems with and without ABS.
10-15
4890-00