System Outline

The driving conditions are determined from indicators such as the wheel speed, yaw rate sensor and steering angle signals, which are sent by ECUs, sensors and switches. The current delivered to the solenoid is then controlled to provide the optimum torque to the rear wheels, in accordance with these driving conditions.

* Auto mode control

* The torque distribution to the rear wheels is increased when the vehicle takes off, to ensure a stable start.

* The torque distribution to the rear wheels is reduced driving slowly to stabilize the vehicle.

* When driving in a stable manner, the torque distribution to the rear wheels is stopped, making the vehicle front wheel drive and reducing fuel consumption.

* When decelerating using the brakes, the 4 wheel drive is released to enhance the effect of the ABS/VSC control.

* Lock mode control

* The torque distribution to the rear wheels is fixed at the maximum level.

* When the vehicle takes off the torque distribution to the rear wheels is set at the maximum level to enable the vehicle to escape if it is stuck.

* The mode automatically reverts to auto mode if the vehicle speed rises to 40 km/h or more.