ACTIVE TORQUE CONTROL 4WD SYSTEM GENERAL


  1. OUTLINE


    1. A compact, lightweight, and high performance active torque control 4WD system is used, which appropriately controls torque distribution to the front and rear wheels using an electromagnetic control coupling in the rear differential.

  2. MAIN FEATURES


    1. Active Torque Control 4WD


      1. Based on information provided by various sensors, the 4WD ECU assembly controls the amperage applied to the electromagnetic control coupling in order to transmit an appropriate amount of drive torque to the rear wheels when needed. The following describes the features and benefits of the active torque control 4WD:

        Traction performance Realizes stable start-off and acceleration performance.
        Driving stability performance Realizes stable cornering performance.
        Fuel economy Realizes better fuel economy by transmitting an appropriate amount of drive torque to the rear wheels when needed.

        • Appropriately distributes drive torque to the front and rear wheels.

        • Ensures start-off performance based on information provided by various sensors.

        • Suppresses the tight corner braking phenomenon* during low-speed cornering.

        • Reduces the amount of torque distribution to the rear wheels and improves fuel economy when the system judges that the vehicle is traveling steadily.

        • Disengages the AWD during braking deceleration.

        *: Tight corner braking phenomenon: a phenomenon in which an AWD vehicle may lurch and decelerate due to a rotational speed difference between the front and rear wheels, such as during low-speed cornering in AWD mode.

      2. Starting Off


        • The system ensures start-off performance by appropriately distributing engine drive torque to the front and rear wheels.

        • To prevent the tight corner braking phenomenon from occurring during low-speed cornering, the system reduces the amount of torque distributed to the rear wheels.

        A01F0RTE03

      3. Normal Driving


        • During normal driving, when the system judges that the vehicle is traveling steadily, it reduces the amount of torque distribution to the rear wheels. This allows the vehicle to operate in conditions similar to front-wheel-drive, improving fuel economy.

        • The system optimizes torque distribution to the rear wheels to ensure both excellent straight-line acceleration performance and excellent driving stability while cornering.

        A01F0MXE03