Direct Electro Hydraulic Actuator Coupling

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 to the rear wheels.

Four Wheel Drive (4WD) transfer mode selection
1. AUTO MODE:
A. 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 distributed to all four wheels automatically without driver intervention.
B. When driving on normal roads and pavement, the vehicle moves similar to conventional 2WD vehicles.
2. LOCK MODE:
A. This mode is used for climbing or descending sharp grades, off-road driving, driving on sandy and muddy roads, etc., to maximize traction.
B. This mode automatically begins to deactivate at speeds above 30 km/h (19 mph) and is shifted to 4WD AUTO mode at speed above 40 km/h (25 mph). If the vehicle speed decelerates to below 30 km/h (19 mph), however, the transfer mode is shifted into 4WD LOCK mode again.

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.




4. Lock Mode
- Maximizes rough terrain performance (active only at speeds below 40 km/h).






Operation

Electronic Coupling

[Inactive]





[Active]