Patent ID: 6845838

Claim:
A four-wheel drive vehicle having a torque distribution clutch mechanism which directly transmits the driving force generated from the engine to one of two front wheels or two rear wheels, and which transmits it to the other wheels therethrough, said torque distribution clutch mechanism being configured to control the engaging force in accordance with a traveling status of the four-wheel drive vehicle, the vehicle comprising: a tight corner judging means for judging whether the vehicle travels at a large turning angle or not; a normal mode setting means for setting a normal mode to control the engaging force of said torque distribution clutch mechanism when it is judged by said tight corner judging means that the vehicle does not travel at the large turning angle; a low friction road judging means for judging whether the vehicle travels on a low friction road or not; and a tight mode setting means for setting a tight mode to control the engaging force of said torque distribution clutch mechanism in a condition that it is judged by said tight corner judging means that the vehicle travels at the large turning angle when it is judged by said low friction road judging means that the vehicle does not travel on the low friction road.