Patent ID: 6907953

Claim:
A driving force distribution control apparatus of a four-wheel drive vehicle, the vehicle including a drive source, front and rear wheels driven by torque generated by the drive source, and a coupling in which torque distribution to the front and rear wheels is changeable, the driving force distribution control apparatus comprising: a controller for controlling the coupling, the controller including program logic that when executed causes the controller to: control the coupling in a torque distribution mode selected from first and second torque distribution modes in accordance with operating parameters indicating an operating state of the vehicle, and in the second torque distribution mode, the torque is distributed to the front and rear wheels more equally than in the first torque distribution mode, and set duration of the second torque distribution mode, when the second torque distribution mode is selected, and continues to control the coupling in the second torque distribution mode regardless of the operating parameters until the duration elapses.