Acceleration slip control device for a vehicle

An acceleration slip control device for controlling a slippage between driving wheels of the vehicle and a road surface during an acceleration of the vehicle, comprising:

• a target speed setting means for determining a target speed according to a running speed of the vehicle;
• a deviation detecting means for detecting a deviation which is defined as a difference between a rotating speed of the driving wheels and said target speed;
• a friction coefficient detecting means for detecting a friction coefficient between the driving wheels and the road surface;
• a control means for controlling a driven torque of the driving wheels on the basis of the magnitude of said deviation and said friction coefficient in such a manner that the rotating speed of the driving wheels coincides with said target speed;
• and
• a reliability determining means for determining the reliability of the value of a currently detected friction coefficient by comparing the value of said currently detected friction coefficient with the magnitude of said deviation detected by said deviation detecting means, wherein said reliability determining means determines that said currently detected friction coefficient is unreliable when the magnitude of said deviation is greater than a predetermined value and said currently detected friction coefficient is greater than a previously detected friction coefficient, said reliability determining means prohibiting said control means from using said currently detected friction coefficient for the control when said currently detected friction coefficient is determined to be unreliable.