Patent ID: 8374761
Filing Date: 2013-02-12
Classification: B60K,B60W

Abstract:
1. A driving force distribution control device for a four-wheel drive vehicle having a mechanism that distributes a torque of an engine, which is transmitted to a main drive wheel, to a secondary drive wheel, comprising: a first torque calculation unit configured to calculate a first torque to be distributed to the secondary drive wheel based on the torque of the engine; a yaw rate detection unit configured to detect a yaw rate of the vehicle; a target yaw rate calculation unit configured to calculate a target yaw rate of the vehicle; a yaw rate deviation calculation unit configured to calculate a yaw rate deviation between the calculated target yaw rate and the detected yaw rate; a torque correction unit configured to correct the first torque based on the yaw rate deviation; a rotation speed difference calculation unit configured to calculate a rotation speed difference between the main drive wheel and the secondary drive wheel; a second torque calculation unit configured to calculate a second torque to be distributed to the secondary drive wheel by the mechanism based on the rotation speed difference; and a control unit configured to control the mechanism so as to distribute a larger torque of the first torque and the second torque to the secondary drive wheel when an absolute value of the yaw rate deviation is smaller than a predetermined value, and to control the mechanism so as to distribute a corrected first torque corrected by the torque correction unit to the secondary drive wheel when the absolute value of the yaw rate deviation is equal to or larger than the predetermined value.