Toyota has developed two new 4WD systems with the aim of improving fuel efficiency and achieving high 4WD handling, stability, and off-road performance.
The new Dynamic Torque Vectoring AWD system is used in gasoline engine vehicles. By adopting a torque vectoring mechanism, which independently distributes torque to the left and right rear wheels according to driving conditions, the Dynamic Torque Vectoring AWD system enables the driver to steer the vehicle exactly as intended. It achieves high off-road performance even on the toughest roads. It also incorporates a disconnect mechanism, which features the world's first ratchet-type dog clutches* on both the front and rear wheel shafts. These clutches stop the drive system rotations, which transmit driving force to rear wheels when in 2WD mode, significantly reducing energy loss and improving fuel efficiency.
The new E-Four system will be used in hybrid vehicles. The system increases total torque to the rear wheels―which are electrically driven―by 30 percent compared to existing versions. By adopting a new control system that optimally distributes torque to the rear wheels based on the driving conditions, the E-Four system offers high off-road performance, handling, and stability.
Moreover, both the Dynamic Torque Vectoring AWD system and the new E-Four system feature AWD Integrated Management (AIM), which harmonizes engine, transmission, braking, and 4WD systems to offer superb handling and stability regardless of road surface conditions.
*As of February 2018 (Toyota Motor Corporation)
4WD Performance Sought by Toyota (4WD Passenger Vehicles)
Achieve both better driving performance and better environmental performance.
New 4WD System Lineup
We will deploy eight models of the new 4WD system for various applications including passenger vehicles, commercial vehicles, and HEVs.
Driving Performance of the New 4WD System
The new system achieves improved basic performance both in on- and off-road situations and exceptional driving performance.
New 4WD System (Conventional Engine Vehicle)
Toyota developed a new 4WD system that combines new automatic and independent control of left and right rear torque with an automatic 2WD switching function.
New 4WD System (HEV)
Toyota developed the new E-Four, which greatly increases rear output torque and automatically controls optimal power distribution to the front and rear wheels.