Patent ID: 6208929
Filing Date: 2001-03-27
Classification: B60K,B60T

Abstract:
A torque distribution control apparatus of a four wheel drive vehicle, the vehicle comprising an engine mounted on said vehicle for supplying a driving force to front wheels and rear wheels respectively of the vehicle, an automatic gear train (2) mounted on said vehicle and mechanically connected to said engine for changing a speed of the vehicle and for transmitting a driving force to each of said wheels, a center differential mechanically interposed between said automatic gear train and said front and said rear wheels for changing a torque distribution ratio between said front and said rear wheels, a brake actuator hydromechanically connected to all of said wheels for stopping a rotation of any of said wheels by wheel cylinders installed on the vehicle for respective ones of said wheels, wheel speed sensors provided near said wheels for detecting speeds of respective ones of said wheels, and for generating respective wheel speed signals, and vehicle driving control means responsive to said wheel speed signals for controlling said vehicle under driving conditions, said torque distribution control apparatus comprising:braking force control means connected to said brake actuator for controlling a braking force to each of said wheels, and for generating a braking force control signal; anda torque distribution controller responsive to said braking force control signal for establishing a smaller engaging force to said center differential than a usual value of engaging force upon application of said braking force to said front wheels or said rear wheels so as to stabilize controllability of said vehicle upon cornering by increasing a free rotation of said wheels, and to improve a response characteristic during a running of the vehicle on a road.