Patent ID: 8489304

Claim:
A torque distribution control apparatus for a four-wheel drive vehicle, comprising: a torque distribution controller configured to control a sub-driving-wheel distribution torque to be transmitted to right and left sub-driving wheels via right and left torque distribution clutches in accordance with a target distribution torque, the vehicle including right and left main driving wheels to which a driving torque output from a driving source is directly transmitted and the right and left sub-driving wheels to which the driving torque is transmitted via right and left torque distribution clutches; a driving-torque calculator configured to calculate the driving torque output from the driving source; a target-distribution-torque calculator configured to calculate the target distribution torque to be distributed to the sub-driving wheels in accordance with the driving torque; a rate determiner configured to determine that a rate of increase of the target distribution torque per unit time is higher than or equal to a second threshold value; and a target-distribution-torque corrector configured to correct the target distribution torque to increase when the target distribution torque is lower than or equal to a first threshold value and when the rate determiner determines that the rate increase of the target distribution torque is higher than or equal to the second threshold value.