TRACTION CONTROL DEVICE, AND TRACTION CONTROL METHOD

A parameter calculation part (390) calculates an adaptive gain coefficient 'k' for the road surface conditions of the road being traveled upon, on the basis of a frictional coefficient µ and a slip ratio » sent from an acquisition part (310) and a coefficient 'b' in a storage part (380). Subsequently, the parameter calculation part (390) calculates an adaptive time constant Ä by which the stability of traction control can be ensured, on the basis of the gain coefficient 'k' and a coefficient 'a' within the storage part (380). Along with the calculated gain coefficient 'k' being set in a gain multiplication part (370), the calculated time constant Ä is set in a filter part (360). According to these settings, model following control is executed by taking, as a reference model, an adhesion model in which driving wheel does not slip. As a result, it is possible to enhance the slip prevention performance while ensuring control stability, and also possible to implement stable traveling while ensuring the required drive force in accordance with the road surface state.