Traction controller for a vehicle

Claim 1

A traction controller for a vehicle comprising; control means for controlling the driving of driving wheels such that the spin quantities of the driving wheels from a road surface become target ones when they exceed predetermined thresholds, vehicle speed detecting means for detecting a vehicle speed, driven wheel speed detecting means for detecting right and left driven wheel speeds, steering angle detecting means for detecting a steering angle, actual turning radius calculating means for calculating the actual turning radius Rr of the vehicle based on the difference between said right and left driven wheel speeds detected by said driven wheel speed detecting means, steering angle corresponding turning radius calculating means for calculating the turning radius Ri of the vehicle based on the steering angle detected by said steering angle detecting means. lateral acceleration calculating means for calculating the lateral acceleration of the vehicle based on the vehicle speed detected by said vehicle speed detecting means and one of the actual turning radius Rr calculated by said actual turning radius calculating means and the steering angle corresponding turning radius Ri calculated by said steering angle corresponding turning radius calculating means, correcting means for correcting the control condition of said control means based on the lateral acceleration calculated by said lateral acceleration calculating means, and turning radius selecting means for judging a tendency for the vehicle to deviate from a running line having the steering angle corresponding turning radius Ri at the time of turning based on at least one of the road surface condition and the driving conditions of the vehicle so as to select as a turning radius for lateral acceleration calculation by said lateral acceleration calculating means the steering angle corresponding turning radius Ri when said tendency is marked, and the actual turning radius Rr when said tendency is not marked.