Patent ID: 8924114
Filing Date: 2014-12-30
Classification: B60K,B60W,B60Y,B62D

Abstract:
1. A control device for a four-wheel drive vehicle comprising: a driving force distributor provided between a main drive shaft, which is either one of a front shaft and a rear shaft, and a sub-drive shaft, which is the other one of the front and rear shafts, the driving force distributor being configured to variably change driving force distribution between the main drive shaft and the sub-drive shaft; a clutch provided on the sub-drive shaft to engage and disengage transmission of driving force to each of a left wheel and a right wheel, instead of a differential mechanism between the right and left wheels, a forward driving state estimator to estimate a forward driving state of a vehicle by recognizing a forward driving path of the vehicle; a clutch controller to control the engagement and disengagement of the right and left clutches of the sub-drive shaft based on at least the forward driving state of the vehicle estimated by the forward driving state estimator; and a driving force distribution controller to calculate, as a target yaw moment, a yaw moment which is applied to the vehicle based on an operation state of the vehicle, and control the driving force distributor based on the target yaw moment, wherein, when an average speed of right and left wheels of the main drive shaft is not more than a speed of a turning outer wheel of the sub-drive shaft, the driving force distribution controller sets the driving force distribution for the sub-drive shaft to zero.