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Traction control apparatus

  • US 8,504,254 B2
  • Filed: 12/25/2009
  • Issued: 08/06/2013
  • Est. Priority Date: 01/08/2009
  • Status: Active Grant
First Claim
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1. A traction control apparatus for an all-wheel-drive construction vehicle, comprising:

  • a vehicle speed estimator that estimates a vehicle speed, the vehicle speed estimator comprising a rotation speed detector that detects a rotation speed of each of wheels and a reference wheel-speed calculator that calculates a reference wheel-speed based on the rotation speed detected by the rotation speed detector;

    a driving-force controller that performs a driving-force control of the construction vehicle based on the vehicle speed estimated by the vehicle speed estimator;

    a vehicle state determiner that determines whether or not the vehicle speed of the construction vehicle estimated by the vehicle speed estimator and the driving-force control by the driving-force controller are balanced; and

    a driving-force control changer that changes a driving-force control by the driving-force controller when the vehicle state determiner determines that the vehicle speed and the driving-force control are unbalanced;

    wherein the driving-force controller comprises a braking mechanism controller that controls a braking mechanism of the construction vehicle, whereinthe braking mechanism controller calculates a slip ratio of each of the wheels based on the rotation speed detected by the rotation speed detector and controls the braking mechanism so that the calculated slip ratio converges to a predetermined target value, andthe vehicle state determiner determines the vehicle speed and the driving-force control to be unbalanced when the slip ratio calculated by the braking mechanism controller exceeds the target value and is kept at a predetermined threshold or more for a predetermined time or more.

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