SSANGYONG RODIUS 2005.07 Manual page 261

(3) Basic ABS Controls
▶ Reference speed
The reference speed is the mean, I.e. average speed of all wheel speeds determined by simple
approximation.
▶ Simplified ABS control
If, during braking, one wheel speed deviates from the reference speed, the ABS control unit
attempts to correct that wheel speed by modulating the brake pressure until it again matches
the reference speed. When all four wheels tend to lock, all four wheels speeds suddenly
deviate from the previously determined reference speed. In that case, the control cycle is
initiated again in order to again correct the wheel speed by modulating the brake pressure.
▶ Selector low control
This control is used for regulating the brake pressure for rear axle during ABS operation. This
control uses lower adhesion coefficient to prevent the rear wheels from locking.
Applications of the ABS control unit
The signals produced by the wheel sensors
are evaluated in the electronic control unit.
From the information received, the control
unit must first compute
variables:
- Wheel speed
- Reference speed
- Deceleration
- Slip
0-9
4892-01
the following
ABS SYSTEM
RODIUS 2005.07