Hyundai Palisade: Coupling Assembly / Direct Electro Hydraulic Actuator Coupling

Hyundai Palisade (LX2) 2020-2024 Service Manual / 4 Wheel Drive (AWD) System / Coupling Assembly / Direct Electro Hydraulic Actuator Coupling

Components and components location
Component Location

Hyundai Palisade. Components and components location

1. Trasaxle assembly
2. Transfer assembly
3. Propeller shaft assembly
4. Coupling assembly


Components

Hyundai Palisade. Components and components location

1. Relief valve
2. Pressure sensor
3. Oil hydraulic motor
4. Coupling asesmbly
5. Input shaft

Description and operation
Description
AWD ECU processes signals from various sensors and determines the current road and driving conditions. The ECU then utilizes this information to implement precision control over the AWD coupling's multi-plate clutch and variably adjust the amount of torque delivered tothe rear wheels.
AWD Driving mode
Under the conditions requiring high driving power such as start/hill climbing/low speed, the front and rear power distribution rate is 5:5. Under the driving conditions which do not require driving power such as constant speed/deceleration, the vehicle operates automatically in 2WD (excluding SAND/MUD/SPORT)
On the slippery road such as snowy/icy road, smooth escape performance is realized by automatically distributing the driving power.
Based on the selected Terrain Mode, control is focused on driving stability and escape performance for SNOW and rough road driving performance is secured in SAND/MUD through high driving power and driving power distribution rate.
Electronic Coupling - AWD Control (By Driving Condition)
1.
Driving conditions
1)
Cruising
- Power is delivered mostly to the front wheels.
Driving power distribution (front wheel 100%, rear wheel 0%)

Hyundai Palisade. Description and operation

2)
Cornering
- Adjusts the amount of power to the rear wheels based on the turning radius and cornering speed.
Driving power distribution (front wheel 80%, rear wheel 20% or front wheel\ 50%, rear wheel 50%)

Hyundai Palisade. Description and operation

3)
In case of start and rapid acceleration
- Steady driving power is delivered to the front and rear wheels in case of start and rapid acceleration
Driving power distribution (front wheel 50%, rear wheel 50% or front wheel 60%, rear wheel 40%)

Hyundai Palisade. Description and operation

2.
Terrain mode
1)
When driving on snowy road (slippery and even road surface)
- Safety-centered low power driving
Driving power distribution (front wheel 50%, rear wheel 50%)

Hyundai Palisade. Description and operation

2)
When driving on sandy road (road surface with high driving resistance)
- High power driving
Driving power distribution (front wheel 50%, rear wheel 50%)

Hyundai Palisade. Description and operation

3)
When driving on muddy road (slippery and uneven road surface)
- Escape performance and running stability
Driving power distribution (front wheel 50%, rear wheel 50%)

Hyundai Palisade. Description and operation

Operation
Electronic Coupling

Hyundai Palisade. Description and operation


1.
The power is delivered in the following order:
Transmission -> Transfer -> Propeller shaft
2.
AWD ECU calculates the necessary amount of rear-wheel torque and sends the corresponding driving current to the actuator (electronic motor and hydraulic pump).
3.
The piston operates by the oil pressure and the friction is generated. Then, the clutch is engaged.
4.
The power is delivered to the differential by the engaged clutch and the driving power is generated in to the rear wheel.

Repair procedures
Inspection
Hyundai Palisade. Repair procedures   
All units are filled up with coupling fluid (ultra-low viscosity ATF) prior to shipping. Inspection, fill-up, and replacement of coupling fluid is therefore not necessary (zero maintenance, lifetime fluid).
Removal
Hyundai Palisade. Repair procedures   
Coupling Maintenance Precautions
Maintain the coupling at a horizontal level.
Refer to the handling caution level (A) when servicing the coupling (removal, installation, replacement, etc.).

Hyundai Palisade. Repair procedures

Always maintain a horizontal posture.

Hyundai Palisade. Repair procedures

1.
Loosen the rear propeller shaft assembly mounting bolts and then removing the rear propeller shaft assembly (A).
Tightening torque :
49.0 - 68.6N.m (5.0 - 7.0kgf.m, 36.2 - 50.6lb-ft)

Hyundai Palisade. Repair procedures

2.
Using a flat tool, separate the propellar shaft from AWD coupling assembly.
3.
Disconnect the oil hydrulic motor connector (A).

Hyundai Palisade. Repair procedures

4.
Disconnect the pressure sensor connector (A).

Hyundai Palisade. Repair procedures

5.
Loosen the coupling assembly mounting bolts.
Tightening torque :
58.9 - 64.7 N.m (5.8 - 6.6kgf.m, 41.9 - 47.7 lb-ft)
6.
Using a flat tool, separate the AWD coupling assembly (A) from the rear differential carrier assembly.

Hyundai Palisade. Repair procedures

Installation
1.
To install, reverse the removal procedures.
Hyundai Palisade. Repair procedures   
Smear the splines (A) with molybdenum type high pressure grease.
When install the coupling, be careful not to damage the oil seal (B).

Hyundai Palisade. Repair procedures

2.
After replacing the coupling, reset the AWD ECU's clutch learing using the diagnotic tool.
(Refer to AWD Control System - "Repair procedures")

    Coupling Assembly

    ..

    Oil hydraulic Motor(Actuator)

    Description and operation Description The AWD ECM controls the Pump Motor Pump (Actuator) to generating an oil pressure. The pressure engages a multiple disk clutch to transfer torque to the rear wheels...

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