Patent ID: 7316457
Filing Date: 2008-01-08
Classification: B60T,B60W

Abstract:
1. A motion control apparatus for a four-wheel drive vehicle in which drive force of a drive source is transmitted to front wheels and rear wheels, the motion control apparatus comprising: stabilization control execution means for obtaining a value representing the degree of over-steer in a turning state of the vehicle and, when the obtained value representing the degree of over-steer exceeds a threshold value, performing vehicle stabilization control which imparts to a front wheel located on the outer side of a turning locus a braking force for generating in the vehicle a yawing moment of a direction opposite the direction of yawing of the vehicle; front-wheel-side idle rotation suppression control means for obtaining a difference between wheel speeds of the left and right front wheels, and, when the obtained difference between wheel speeds of the left and right front wheels exceeds a front-wheel-side allowable limit, imparting a braking force for suppressing front-wheel idle rotation to the one of the left and right front wheels that is of higher wheel speed; and rear-wheel-side idle rotation suppression control means for obtaining a difference between wheel speeds of the left and right rear wheels, and, when the obtained difference between wheel speeds of the left and right rear wheels exceeds a rear-wheel-side allowable limit, imparting a braking force for suppressing rear-wheel idle rotation to the one of the left and right rear wheels that is of higher wheel speed, wherein the front-wheel-side idle rotation suppression control means is configured such that when the vehicle stabilization control is being performed, the front-wheel-side idle rotation suppression control means lowers the braking force for suppressing front-wheel idle rotation to be imparted to the one of the left and right front wheels that is of higher wheel speed.