2013 SSANGYONG NEW ACTYON SPORTS oil

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1. SYSTEM DESCRIPTION
The power steering has been designed to make the wheel move more easily than in a manual steering
system. The hydraulic power assists the process utilizing hydraulic fluid. The fluid increases pressure in
the power steering pump and aids the movement of the steering mechanism. The power steering
system consists of pump, oil reservoir, rack and gear box. The power steering pump is a vane type and
delivers hydraulic pressure to operate the power steering system. The pressure relief valve in the pump
controls the discharging pressure. The rotary valve in the rack and the pinion gear directs the oil from the
power steering pump to one side of the rack piston. The integrated rack piston converts the hydraulic
pressure to linear movement. The operating force of the rack moves the wheels through the tie rod, the
tie rod end and the steering knuckle. Even though the hydraulic pressure cannot be generated, a driver
can steer the vehicle without power assist but it needs very high steering force. In this case, the
operating force of the steering wheel is conveyed to the pinion, and the movement of the pinion moves
the rack through the pinion gear combined to the rack gear.

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2. SYSTEM LAYOUT
The steering pump is driven by the engine power through a belt. This pump circulates the power steering
oil from the reservoir -> steering pump -> oil supply pipe -> steering gear box -> oil return pipe ->
reservoir to perform steering operations
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
Return hose & tube
Steering pump &
reservoir
High pressure hose
Linkage gear box Steering wheel
Lower shaft Column & shaft
HPS model
SSPS model

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Oil Flows during Right Turn ▶
Steering pumpTo piston pipe
in
From piston pipePiston pipe
Piston
Oil reservoir

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1. SPECIFICATIONS
Item Item Specification
SSPS solenoid valveRated voltage DC 12 V
Rated voltage 1.0 A
Resistance6.7 ±1 Ω
Power steering oil pump
(with SSPS)Operating temperature-40℃~150℃
Release pressure 90 bar
Displacement 9.3 cc/rev
Flow velocity 9.75~6 l/mn
Pulley sizeØ115
Pulley type 6 groove
Housing material Aluminium
Power steering fluid reservoir
(with SSPS)Fracture pressuremin 8kgf/㎠
Air leakage2 kgf/㎠×min
Cap open torque 9.8 to 14.2 Nm
Oil capacity FULL 550cc
Power steering gear box
(with SSPS)Gear type Rack & pinion type
Gear ratio 40.245
Fixed rack 3.78
Gear weight 12.800 kg
Steering angleInner36.2°
Outer32.4°

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▶ In medium and high speed driving
The shaft operation force of solenoid rod is reduced due to the reduction of output current from SSPS
control unit.
The coil spring pulls the PCV spool toward solenoid valve to open it.
The hydraulic pressure from pump flows to pinion reaction area through orifice and applies reaction
force to reaction plunger.
At this time, the reaction plunger transmits the reaction force to V-groove in input shaft to provide heavy
steerability. 1.
2.
3.
4.

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4) System Control
ECPS system, according to the vehicle speed,
enables to achieve proper steering
characteristics by controlling hydraulic
pressure to reaction plunger located in input
shaft of power steering gear box. In other words,
ECPS control unit enhances the parking
conveniences by controlling duty type current
control. It provides heavy steerability with low
current as the vehicle speed increases. And, it
provides light steerability with high current as the
vehicle speed decreases.
▶During parking and low speed driving
During parking and driving in low speed, the control unit supplies approx. 1 A of electric current to
solenoid valve. Then, the spool located in PCV compresses the upper spring and elevates upward and,
the working pressure from oil pump (A port) is not able to flow to the reaction plunger (C port). As a
result, the pressing force from reaction plunger disappears and the steerability enhances.

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▶During high speed driving
During high speed driving, the control unit supplies weak electric current to solenoid valve. Then, the
spool located PCV moves from top to bottom, and the working pressure (A port) from oil pump is applied
to reaction plunger (C port ) through B port. As a result, the pressing force from reaction plunger against
input shaft is increased and the steerability becomes heavier.

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Contact coil
- Heated steering wheel connector adopted and its appearance changed
- Fixing keys (3 off) for engaging with multifunction switch
4. MAJOR CHANGES
Heated steering wheel connector
(to contact coil)
Pin No. Name
1 Ground
2 IGN
3 Heated steering
wheel switch
ON/OFF
4 Heated steering
wheel switch
signal
Fixing key