Control Module: Description and Operation

Description

Four Wheel Drive (4WD) transfer mode selection
1. AUTO MODE:

CAUTION:
- 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.

- When driving on normal roads and pavement, the vehicle moves similar to conventional 2WD vehicles.

2. LOCK MODE:

CAUTION:
- This mode is used for climbing or descending sharp grades, off-road driving, driving on sandy and muddy roads, etc., to maximize traction.
- 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.

Operation

- Normal driving situation: 2WD base driving
- 4WD driving in driving situations (rapid activation, cornering etc.)
1. Input the information from each sensor in vehicle
A. Input torque (Throttle position sensor)
B. Cornering situation (Steering angle sensor)
C. Vehicle speed and different wheel speed front &rear (Wheel speed sensor)
D. Braking situation (Brake signal and ABS signal)
2. Distributed the required driving force after 4WD ECU operates.
3. EMC (Electric Magnetic Clutch) operates the primary clutch.




4. Control the cam's opening gap by operation of primary clutch.




5. Control the slip of inner & outer plate.
Control variably the driving force distribution to optimize front & rear driving force.