SsangYong Korando III (2010 year). Manual — part 247

13-3

4610-00

1. SPECIFICATION

Unit

Description

Specification

System operation

Operating type

Motor driven power steering system

Operating temperature

- 40°C to 80°C

Rated voltage

12 V

Rated current

85 A

Operating voltage

Network

8 to 16 V

C-EPS ECU

8 to 16 V

Full Performance

10 to 16 V

Motor

Type

3-Phase BLAC (Brushless AC)

Rated current/voltage

85 A / 12 V (at idle 0.5 A)

Position sensor type

Hall sensor type

Torque & angle sensor

Type

Non-contact type

Steering column

Operating type

Manual tilting & telescoping

Lower shaft

Type

Sliding (Ball slip) type

Steering gear

Gear ratio

46.94 mm/rev

Rack stroke

146 mm

Maximum steering angle

Inner wheel

39°

Outer wheel

31.24°

13-4

2. TIGHTENING TORQUE

13-5

4610-00

3. DIFFERENCES BETWEEN HPS AND EPS

HPS

EPS

1

Crankshaft pulley (DDU)

2 Auto

tensioner

3 Tensioner

pulley

4 Vacuum

pump

5

A/C compressor pulley

6 Alternator

pulley

7

Water pump pulley

8

No.1 idle pulley

9

No.2 idle pulley

10

Power steering pump

-

HPS (Hydraulic Power Steering)

EPS (Electric Power Steering)

13-6

Hydraulic power steering

Electric power steering

1. OVERVIEW

The electric power steering, EPS, does not have any belt-driven steering pump constantly running, so it
is lightweight and the motor consumes energy only when the steering wheel is turned by the driver, and
this leads to improvement in fuel efficiency. Also, the elimination of a belt-driven pump and its
accessories greatly simplifies manufacturing and maintenance. While offering these benefits, as it does
not contain any steering oil, the environment is not polluted both when the steering system is produced
and discarded.
In other words, the electric power steering (EPS) system uses the electric motor to assist the steering
force. It functions independently regardless of whether the engine is running or not, unlike the existing
hydraulic power steering.
The EPS system generates an assist steering force variably depending on the driving conditions by
controlling the motor's operation, based on the input signals from the sensors such as torque sensor and
angle sensor. In turn, the EPS receives the torque signal by the driver's movements of the steering
wheel, as well as the vehicle speed, and uses the motor to determine the assist torque. The EPS
controls the motor for this. Another features of EPS are fail-safe function, diagnosis function,
communication function between units and interface function for external diagnostic device.
The EPS system components such as the torque sensor, steering angle sensor, fail-safe relay, etc. are
located in the steering column and EPS unit assembly.

Advantages:

▶

Assurance of improved steering
Provides optimal steering force according to the
vehicle speed
Enhanced steering stability while driving at high
speed

(1)

-

-

Reduced fuel consumption
Consumes energy only when steering wheel
is turned (improved by 3 to 5%)
Energy saving (reduced by 85% compared
with hydraulic power steering)
Reduced number of parts: Elimination of
steering pump, hydraulic hose, pump pulley,
oil reservoir, belt, bracket, etc.

(2)

-

-

-

Comparison between hydraulic power steering and electric power steering (EPS)

▶