ALLGRIP AUTO 4x4 gives the driver peace of mind in everyday driving, especially when driving on slippery roads or snowy surfaces. With the viscous coupling four-wheel drive system, torque is automatically distributed to the rear wheels, when it detects the front wheel losing grip of the road.
A viscous coupling (hydraulic clutch) positioned in front of the rear differential uses high-viscosity silicone oil to transfer drive power. When rotational variance occurs between the front and rear wheels, a shear effect caused by wheel spin heats the silicone oil and causes it to expand. The pressure resulting from the expanded silicone oil engages a multiple-disc clutch, which transfers torque to the rear wheels.
Grip Control (Only available in ignis)
This function ensures a smooth start on roads that are slippery with snow or mud. It quickly applies the brake to the slipping wheel while focusing drive power on the opposite wheel, and improves escape performance by using traction control to limit the loss of engine torque.
ALLGRIP SELECT 4x4 provides the inherent values "Fun to drive", "Peace of mind" and "High fuel-efficiency" by allowing the driver to choose from four driving modes (AUTO, SPORT, SNOW, and LOCK). The electronically controlled four-wheel-drive system with selectable driving mode uses a simple push-and-turn dial so the driver can experience different driving styles depending on the road surfaces or conditions.
To amplify driving pleasure, the power train too is controlled in SPORT mode. It modifies throttle-torque performance in the low and medium engine speed range to give a livelier drive experience. And in the case of Automatic vehicles it also helps maintain the engine speed at higher levels, improves acceleration, and offers sports driving performance.
The feedback control used on normal full-time 4WD vehicles allocates torque to the rear wheels after detecting front wheel slippage. As well as feedback control, it also offers feed-forward control that anticipates slippage based on road surface, throttle opening position, steering angle and other factors, and allocates the torque to the rear wheels before any slippage can occur.
Rather than reacting after grip is lost, controlling the vehicle to prevent grip being lost in the first place results in greater stability.
The three inherent values of the ALLGRIP SELECT, Fun to drive, Peace of mind, and High fuel-efficiency can be realised by selecting the mode. Mode selection lets you experience different styles of driving for different situations.
ALLGRIP PRO offers high off-road ability to meet the driver’s spirit of adventure, and gives the driver strength to face and explore the challenges. With the four-wheel drive system with reduction gear, ALLGRIP PRO can satisfy the driving performance required by professionals to instantly respond and manoeuvre through difficult terrain.