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Antiskid control apparatus

  • US 5,594,648 A
  • Filed: 12/23/1994
  • Issued: 01/14/1997
  • Est. Priority Date: 12/29/1993
  • Status: Expired due to Term
First Claim
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1. An antiskid control apparatus for a vehicle capable of switching a drive state thereof between a 2WD and a 4WD comprising:

  • means for calculating an average front wheel speed and outputting a signal indicating the calculated average front wheel speed;

    means for calculating an average rear wheel speed and outputting a signal indicating the calculated average rear wheel speed;

    speed difference calculation means for calculating a speed difference between the average front wheel speed and the average rear wheel speed and outputting a signal indicating the calculated speed difference;

    means for smoothing the speed difference and outputting a signal indicating the calculated smoothed speed difference; and

    drive state decision means for deciding the drive state of the vehicle as a 4WD state if the smoothed speed difference is in a range between a predetermined upper threshold and a predetermined lower threshold and as a 2WD state if the smoothed speed difference is in a range above the predetermined upper threshold or below the predetermined lower threshold,wherein according to the drive state determined by the drive state decision means, the antiskid control state of the vehicle is switched between an antiskid control for the 2WD and an antiskid control for the 4WD, wherein the antiskid control controls the hydraulic brake pressure at each wheel in accordance with the determined drive state.

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