1) With mechanical locking center differential (C. DIF. AUTO). When you press a button on the instrument panel, the hydraulic drive located on the transfer case blocks the center differential at the command of the electronic control unit. This leads to the necessary distribution of torque to the front and rear axles, which significantly improves cross-country ability.
2) With automatic locking center differential (viscous coupling). This system does not require driver intervention, but cars equipped with this system have worse off-road performance compared to cars with the system "C. DIF. AUTO". This is due to the fact that the viscous clutch does not provide 100% blocking and the clutch is actuated with a small time delay.
Scheme of all-wheel drive with a viscous coupling
1 - center differential,
2 - center differential,
3 - viscous coupling.