Traction control device

A traction control device of a construction machine comprising a braking mechanism provided to each of wheels, the traction control device controlling the braking mechanism, the traction control device comprising:

• a rotation speed detector that detects a rotation speed of each of the wheels;
• a vehicle speed estimator that estimates a vehicle speed of the construction machine;
• and
• a braking mechanism controller that controls the braking mechanism, wherein the braking mechanism controller comprises:
• a control deviation calculating section that calculates a control deviation based on the rotation speed and the vehicle speed;
• a target brake torque calculating section that calculates a target brake torque applied to each of the wheels by the braking mechanism based on the control deviation;
• a target brake torque determining section that determines whether or not the target brake torque reaches or exceeds a pre-stored threshold;
• a reference wheel determining section that selects a reference wheel used as a reference for controlling the braking mechanism based on the target brake torque to each of the wheels;
• and
• a target brake torque reducing section that reduces the target brake torque in accordance with a difference between the target brake torque to the reference wheel and the threshold when the target brake torque to one of the wheels reaches or exceeds the threshold.