SsangYong Stavic / SsangYong Rodius (2005 year). Manual - part 413

ABS/ESP SYSTEM

STAVIC - 2004.09

35

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

(2) When applied ABS (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.

Outlet valve

Separation valve

Inlet valve

Shuttle valve

Pump

Low pressure

chamber

ABS/ESP SYSTEM

STAVIC - 2004.09

36

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

(3) When applied ABS (maintained pressure)

The Inlet valve and outlet valve will be closed to maintain the pressure in the hydraulic circuit applied at the wheels. By
closing the valves, the hydraulic pressure at the wheels will not be lost or supplied any more. During ESP operation, the
separation valve closes and only the shuttle valve at the pump opens.

Outlet valve

Separation valve

Inlet valve

Shuttle valve

Pump

Low pressure

chamber

ABS/ESP SYSTEM

STAVIC - 2004.09

37

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

(4) When applied ABS (increased pressure)

The shuttle valve and inlet valve will be open and the separation valve and outlet valve will be closed. Then, the pump is
operated.

When ESP operates while the ABS is operating, the pressure will be increased continuously until just before the
corresponding wheel gets locked.

Outlet valve

Separation valve

Inlet valve

Shuttle valve

Pump

Low pressure

chamber

ABS/ESP SYSTEM

STAVIC - 2004.09

38

4K

CHANGED BY

EFFECTIVE DATE

AFFECTED VIN

(5) Hydraulic Diagram of HBA

The above figure shows one front and one rear wheel and the same hydraulic circuit forms as in the ESP operation.

When HECU recognizes that it is an emergency and it is required for hard braking, depending on the pressure value of
the brake pressure sensor and pressure changes caused by the pressure sensor timing, it operates the pump immedi-
ately to apply the brake pressure at the wheels.

Then, the pressure in the pump increases until just before the corresponding wheel gets locked. The motor still keeps
rotating and the outlet valve and the separation valve are will stay closed. When the wheel starts to lock, the HBA
function cancels and switches to ABS operation.

Outlet valve

Separation valve

Inlet valve

Shuttle valve

Pump

Low pressure

chamber

Outlet valve

Inlet valve

Front wheel

Rear wheel