Hyundai Santa Fe (TM): Coupling Assembly / Direct Electro Hydraulic Actuator Coupling. Description and operation

Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual / 4 Wheel Drive (4WD) System / Coupling Assembly / Direct Electro Hydraulic Actuator Coupling. Description and operation

Description
4WD 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 4WD coupling's multi-plate clutch and variably adjust the amount of torque delivered tothe rear wheels.
Four Wheel Drive (4WD) transfer mode selection
1.
AUTO MODE:
–
When driving in 4WD AUTO mode, the vehicle operates similar to conventional 2WD vehicles under normal operating conditions. However, if the system determines that there is a need for the 4WD mode, the engine’s driving power is distributedto all four wheels automatically without driver intervention.
–
When driving on normal roads and pavement, the vehicle moves similar to conventional 2WD vehicles.
2.
LOCK MODE:
–
This mode is used for climbing or descending sharp grades, off-road driving, driving on sandy and muddy roads, etc., to maximize traction.
–
However, binding may occur in LOCK MODE when circling and it does not operate when the vehicle speed is over 60 km/h.
Electronic Coupling - 4WD Control (By Driving Condition)
1.
Cruising (Auto Mode)
–
Power is delivered mostly to the front wheels.
2.
Cornering (Auto Mode)
–
Adjusts the amount of power to the rear wheels based on the turning radius and cornering speed.
3.
Wheel Slip (Auto Mode)
–
If one or both of the front wheels lose traction, the system transfers an appropriate amount of power to the rear wheels based on the slip amount at the front wheels.
Operation
Electronic Coupling

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.

    Component Location 1. Relif valve 2. Pressure sensor 3. Oil hydraulic motor 4. Coupling assembly

    Inspection    • All units are filled up with coupling fluid (ultra-low viscosity ATF) prior to shipping.

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