Patent ID: 8285450
Filing Date: 2012-10-09
Classification: B60T

Abstract:
1. A differential limiting control device for a vehicle, comprising: a differential limiting unit that regulates a differential limiting force between right and left wheels to which a driving force from a driving source is transmitted; a target turning state index determination unit that determines target yaw rate as a target turning state index on the basis of a driving state of a vehicle; an actual turning state index detection unit that detects an actual yaw rate as actual turning state index of the vehicle; a control amount calculating unit that calculates a turning correspondence control amount as a compensation amount with respect to the differential limiting force to be applied to between the right and left wheels, based upon yaw rate deviation between the target yaw rate and the actual yaw rate; a steering characteristic judging unit that judges whether a vehicle's steering characteristic of the moment is understeer or oversteer based upon a comparison result between the target yaw rate and the actual yaw rate; a wheel speed detection unit that detects wheel speeds of the right and left wheels; a wheel speed judging unit that judges whether wheel speed of a turning inner wheel is higher than wheel speed of a turning outer wheel, or wheel speed of the turning inner wheel is lower than wheel speed of the turning outer wheel; and a differential limiting control unit that reflects the turning correspondence control amount in the differential limiting force for compensation toward an increase or decrease side according to a combination of the steering characteristic judged by the steering characteristic judging unit and a result of judgment by the wheel speed judging unit, and controlling the differential limiting unit according to a differential limiting force after the compensation, wherein if it is determined that wheel speed of a turning inner wheel is higher than wheel speed of a turning outer wheel, the differential limiting control unit applies an increase compensation to the differential limiting force between the right and left wheels according to the turning correspondence control amount when the steering characteristic judged by the steering characteristic judging unit is understeer, and applies a decrease compensation to the differential limiting force between the right and left wheels according to the turning correspondence control amount when the steering characteristic is oversteer, and wherein, if it is determined that the wheel speed of the turning inner wheel is lower than the wheel speed of the turning outer wheel, the differential limiting control unit applies a decrease compensation to the differential limiting force between the right and left wheels according to the turning correspondence control amount when the steering characteristic judged by the steering characteristic judging unit is understeer, and applies an increase compensation to the differential limiting force between the right and left wheels according to the turning correspondence control amount when the steering characteristic is oversteer.