steering SSANGYONG RODIUS 2012 User Guide

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2) Sensor Cluster
3) Steering Wheel Angle Sensor
Air gap between sensor and rotorFront 0.335 ~ 0.945mm
Rear 0.309 ~ 0.958mm
Current (at 2.75 km/h)IHIGH : 14mA
ILOW : 7mA
Voltage (when turning the steering wheel one turn per second) 7.5 ~ 20V
4) Active Wheel Speed Sensor
Operating voltage 9~16V
Maximum output current 10mA
Maximum detection angle speed 1500˚/s
Operating temperature -30~75℃
Supplying voltage 9 to 16 V (battery voltage)
Output voltage (HI) approx. 3.50V (3.0 to 4.1V)
Output voltage (LO) approx. 1.50V (1.3 to 2.0V)
Description Specification
Description Specification
Description Specification
Supplying voltage approx. 5V (4.75~5.25V)
Output voltage while in stationary approx. 2.5V (Ignition ON)
Output range 0.2~4.8V
Operating start speed4˚/s

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1. ESP (Electronic Stability Program)
ESP system contains the ABS (Anti-Lock Brake System), ABD (Automatic Braking Differential),
ASR (Acceleration Slip Regulation), Cornering Control and HBA (Hydraulic Brake Assist System)
functions.
▶Cornering Control (Understeer and Overersteer) Function
This function controls the vehicle stability by applying the braking pressure on each wheel
according to the yaw rate, lateral sensing value and driver’s steering wheel control.
▶HBA (Hydraulic Brake Assist System) Function
HBA (Hydraulic Brake Assist) system helps in an emergency braking situation when the driver
applies the brake fast, but not with sufficient pressure, which leads to dangerously long braking
distance. ECU recognizes the attempt at full braking and transmits the signal calling for full brake
pressure from the hydraulic booster.

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HECU(Hydraulic & Electronic Control Unit)
ESP ABS
2. LAYOUT
Name ESP ABS Location
1 HECU O O Under the battery
2 Pressure Sensor O X Under the master cylinder
3 Wheel Speed Sensor O O On wheels
4 Sensor Cluster O X Under the audio assembly
5 Steering Wheel Angle Sensor O X Under the steering wheel
Pressure Sensor
Installed Removed

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1. ESP Indicator2. Steering Wheel Angle
Sensor
3. ESP OFF Switch 4. Sensor Cluster
Front Wheel Speed Sensor
4WD 2WDRear Wheel Speed
Sensor

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2) Operation of ESP System
(1) Under steering
What is understeering? ▶
ESP controls during understeer ▶ Understeer is a term for a condition in which the steering wheel is steered to a certain angle
during driving and the front tires slip toward the reverse direction of the desired direction.
Generally, vehicles are designed to have understeer. It is because that the vehicle can return back
to inside of cornering line when the steering wheel is steered toward the inside even when the
front wheels are slipped outward.
As the centrifugal force increases, the tires can easily lose the traction and the vehicle tends to
slip outward when the curve angle gets bigger and the speed increases.
The ESP system recognizes the directional angle with the steering wheel angle sensor and senses
the slipping route that occurs reversely against the vehicle cornering direction during understeer
with the yaw rate sensor and lateral sensor. Then, the ESP system applies the braking force to the
rear inner wheel to compensate the yaw moment value. In this way, the vehicle does not lose its
driving direction and the driver can steer the vehicle as intended.

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(2) Over steering
What is oversteering? ▶
ESP controls during oversteer ▶ Oversteer is a term of a condition in which the steering wheel is steered to a certain angle during
driving and the rear tires slip outward losing traction.
Compared to understeering vehicles, it is hard to control the vehicle during cornering and the
vehicle can spin due to rear wheel moment when the rear tires lose traction and the vehicle speed
increases.
The ESP system recognizes the directional angle with the steering wheel angle sensor and senses
the slipping route that occurs towards the vehicle cornering direction during oversteer with the
yaw rate sensor and lateral sensor. Then the ESP system applies the braking force to the front
outer wheel to compensate the yaw moment value. In this way, the vehicle does not lose its
driving direction and the driver can steer the vehicle as intended.

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(3) ESP Control
The ESP (Electronic Stability Program) has been developed to help a driver avoid danger of losing
control of the vehicle stability due to understeer or oversteer during cornering. The yaw rate sensor,
lateral sensor and longitudinal sensor in the sensor cluster and the steering wheel angle sensor
under the steering column detect the vehicle conditions when the inner or outer wheels are
spinning during oversteer, understeer or cornering. The ESP ECU controls against oversteer or
understeer during cornering by controlling the vehicle stability using input values from these
sensors and applying the braking force to the corresponding wheels independently. The system
also controls the engine power right before the wheel spin synchronized to decelerate the vehicle
automatically in order to maintain the vehicle stable during cornering.

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1. SYSTEM OVERVIEW
When braking suddenly or braking on slippery roads, the vehicle keeps moving forward but the wheels
are locking and not rotating. If these happen, the vehicle may lose stability or rotate resulting in an
accident. ABS helps to maintain directional stability and control of the vehicle. ABS is designed to secure
more safety and increase the control of steering wheel during emergency braking situation. But, ABS
does not guarantee perfect safety beyond its physical limit. ABS in this vehicle contains EBD function. In
normal driving conditions, the brake system operates without ABS function.
1) Basic Theory of ABS Function
To give you a better understanding of the tasks and functions of ABS, we will first look at the physics
principles.
▶Stopping distance
The stopping distance depends on the vehicle weight and initial speed when braking starts. This also
applies for vehicle with ABS, where ABS always tries to set an optimum brake force on each wheel. As
great forces are exerted between the tires and the carriageway when braking, even with ABS the wheels
may scream and rubber is left on the road. With an ABS skid mark one may be able to clearly recognize
the tire profile. The skid mark of an ABS vehicle does not however leave any hint of the speed of the
vehicle in the case of an accident, as it can only be clearly drawn at the start of braking.
▶Brake force on a wheel
The maximum possible brake force on a wheel depends on the wheel load and the adhesion coefficient
between tire and carriageway. With a low adhesion coefficient the brake force, which can be obtained is
very low. You are bound to know the result already from driving on winter roads. With a high adhesion
coefficient on a dry road, the brake force, which can be obtained, is considerably higher. The brake
force, which can be obtained, can be calculated from below formula:

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1. SPECIFICATIONS
Description Specification
Steering wheelType 4-spoke type
Outer diameter (mm) 390
Steering gear boxType Rack and pinion type
Steering angleInner36.4°
Outer31.5°
Steering oil pumpType Vane type
Maximum pressure (kgf/cm2)90±3
Pulley size (mm)Ø115
Operating temperature-40℃ ~ 150℃
Steering oilType S-PSF3
Capacity (L) approx. 1.1
Minimum turning radius (m) 6.08
Tilting angle±3°

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2. TIGHTENING TORQUE
DescriptionKgf·m N·m
Steering column shaftSteering column mounting bolt 2.0 ~ 2.5 19.6 ~ 24.5
Steering wheel and steering column shaft
lock nut4.0 ~ 6.0 39.2 ~ 58.8
Steering wheel and air bag module
mounting bolt0.7 ~ 1.1 6.8 ~ 10.8
Steering column and lower shaft
connection bolt.1.8 ~ 2.5 17.6 ~ 24.5
Power steering gear
boxSteering gear box and gear box cross
member mounting bolt7.0 ~ 9.0 68.6 ~ 88.2
Steering gear box and lower shaft
connection bolt2.5 ~ 3.0 24.5 ~ 29.4
Tie rod end and knuckle connection nut 3.5 ~ 4.5 34.3 ~ 44.1
Tie rod end lock nut 6.5 ~ 8.0 63.7 ~ 78.4
Steering gear box and pressure hose
connection nut3.2 ~ 3.8 31.4 ~ 37.2
Steering gear box and return line
connection nut3.2 ~ 3.8 31.4 ~ 37.2
Power steering pumpEye bolt for oil supply pipe to power
steering pump5.5 ~ 6.5 53.9 ~ 63.7
Power steering pump mounting bolt 2.0 ~ 2.5 19.6 ~ 24.5
Power steering line Return line and clip connection bolt 1.2 ~ 1.8 11.7 ~ 17.6