Traction control method for vehicle

A traction control method for a vehicle, comprising the steps of:

• comparing the amount of driven wheel speed (V.sub.W) changed per unit time with a reference deceleration (V.sub.R-) as well as a reference acceleration (.DELTA.V.sub.R+) whose absolute value is set larger than that of said reference deceleration (.DELTA.V.sub.R-);
• setting the vehicle speed (V.sub.R) equal to the driven wheel speed (V.sub.W), if the amount of said driven wheel speed (V.sub.W) changed per unit time indicates a deceleration less than the reference deceleration (.DELTA.V.sub.R-);
• setting the vehicle speed (V.sub.R) equal to the last determined vehicle speed (V.sub.R(n-1)) corrected by a value based on the reference deceleration (.DELTA.V.sub.R-), if the amount of said driven wheel speed (V.sub.W) changed per unit time indicates a deceleration greater than or equal to the reference deceleration (.DELTA.V.sub.R-);
• setting the vehicle speed (V.sub.R) equal to the driven wheel speed (V.sub.W), if the amount of said driven wheel speed (V.sub.W) changed per unit time indicates an acceleration less than the reference acceleration (.DELTA.V.sub.R+);
• setting the vehicle speed (V.sub.R) equal to the last determined vehicle speed (V.sub.R(n-1)) corrected by said reference acceleration (.DELTA.V.sub.R+), if the amount of said driven wheel speed (V.sub.W) changed per unit time indicates an acceleration greater than or equal to the reference acceleration (.DELTA.V.sub.R+);
• determining a slipping tendency of a driving wheel in a driving state by comparing a reference speed (V.sub.RH, V.sub.RL) obtained on the basis of said vehicle speed (V.sub.R) with a driving wheel speed;
• and
• suppressing the driving torque in accordance with said determined slipping tendency of said driving wheel in the driving state.