SSANGYONG KYRON 2007.04 Manual page 720

12-38
4890-01
9. HYDRAULIC PRESSURE FOR EACH ESP OPERATING
RANGE
1) ESP Operating Explanation
When equipped with ABS, the braking force at each wheel will be controlled with 3-channel 4-
sensor method. And when equipped with ESP, 4 wheels will be controlled independently with 4-
channel method. (When controlling ABS system only, it will be operated with 3-channel method.)
When compared to the vehicle equipped with ABS/EBD only, the internal hydraulic circuit has a
normally-open separation valve and a shuttle valve in primary circuit and in secondary circuit.
When the vehicle brakes are not applied during engine running or when applying the non-ABS
operating brakes, the normally-open separation valve and the inlet valve are open, whereas the
normally-closed shuttle valve and the outlet valve are closed. When the ESP system is operating,
the normally-open separation valve will be closed by the solenoid valve operation and the hydraulic
circuit will be established by the shuttle valve. Then, the inlet and outlet valves will be closed or
open depending on the braking pressure increase, decrease or unchanged conditions.
For details, refer to "Hydraulic Pressure for each ESP Operating Range".
▶ ESP Hydraulic unit in idling and
normal braking position
In this position, the separation valve and the
inlet valve are open (normal open), the
electrically operated shuttle valve and the
outlet valve are closed.
When the brake is applied under these
conditions, the brake fluid will be sent to
each wheel via the separation valve and
inlet valve.
ESP
KYRON 2007.04
▶ ESP Hydraulic unit (decreased
pressure)
The pressure decreases just before the
wheel speed drops and the wheels. The inlet
valve closes and the outlet valve opens as in
the ABS HECU and the oil is gathered at the
low pressure chamber while no additional oil
is being supplied. Then the pump operates
to allow fast oil drainage.