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Wheel pressure-reduction determining system for vehicle

  • US 5,866,812 A
  • Filed: 10/09/1996
  • Issued: 02/02/1999
  • Est. Priority Date: 10/11/1995
  • Status: Expired due to Fees
First Claim
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1. A wheel pressure-reduction determining system for a vehicle, comprising:

  • a follower wheel speed difference calculating means (M1) for calculating a follower wheel speed difference (FID) as a difference between left and right follower wheel speeds (VWNL and VWNR);

    a driven wheel speed difference calculating means (M2) for calculating a driven wheel speed difference (RID) as a difference between left and right driven wheel speeds (VWDL and VWDR);

    a driven wheel slip amount calculating means (M4) for calculating a driven wheel slip amount (KIDD) of said follower and driven wheel speeds as a deviation between both said speed differences (FID and RID);

    a driven wheel torque calculating means (M5) for calculating a driven wheel torque (TQDW) based on an engine torque;

    a driven wheel slip amount estimating means (M6) for estimating a characteristic of variation in said driven wheel slip amount (KIDD) relative to the driven wheel torque (TQDW), based on said driven wheel slip amount (KIDD) and said driven wheel torque (TQDW);

    a deviation calculating means (M7) for calculating a deviation (CKID) between both said speed differences (FID and RID) of said follower and driven wheel speeds as said driven wheel slip amount (KIDD) at the time when the driven wheel torque (TQDW) is zero, from said variation characteristic estimated by said driven wheel slip amount estimating means (M6); and

    a wheel pressure-reduction determining means (M8) for determining a reduction in pressure of follower wheels (WFL and WFR) an driven wheels (WRL and WRR) by comparing said deviation (CKID) calculated by said deviation calculating means (M7) with a predetermined reference value.

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