Patent ID: 6575261
Filing Date: 2003-06-10
Classification: B60K

Abstract:
A drive-force distribution controller for a four-wheel-drive vehicle having a torque distribution unit configured to distribute an output torque transmitted from a prime motor to a first set of wheels to a second set of wheels, the drive-force distribution controller compnsing:first judging means for judging which of the first set of wheels is an inner wheel with respect to a turning of the four-wheel-drive vehicle; second judging means for judging whether the turning of the four-wheel-drive vehicle is a tight turn; third judging means for judging whether the inner wheel is slipping; fourth judging means for judging whether an outer wheel of the first set of wheels is slipping; and controlling means for controlling the torque distribution unit, wherein the second judging means judges that the four-wheel-drive vehicle is engaged in a tight turn if the turning has a turning radius smaller than a predetermined value, and the controlling means decreases the output torque to the second set of wheels if the second judging means judges that the four-wheel-drive vehicle is engaged in a tight turn and if the third and fourth judging means judge that the first set of wheels are not slipping.