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Brake control system

  • US 6,325,469 B1
  • Filed: 09/07/1999
  • Issued: 12/04/2001
  • Est. Priority Date: 09/06/1996
  • Status: Expired due to Fees
First Claim
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1. A brake system control method for use in a vehicle with four wheels comprising the steps of:

  • determining a desired yaw rate;

    determining a yaw torque command responsive to the desired yaw rate, wherein the yaw torque command is determined in understeer conditions and is determined in oversteer conditions;

    if the vehicle is in an anti-lock braking mode during driver commanded braking, applying the yaw torque command to only one of the four wheels to release brake pressure in said one of the four wheels;

    if the vehicle is in a positive acceleration traction control mode during driver commanded acceleration, applying the yaw torque command to only one of the four wheels to apply brake pressure in said one of the four wheels; and

    if the vehicle is not in the anti-lock braking mode or in the positive acceleration traction control mode, then;

    (i) determining whether a vehicle brake pedal is depressed;

    (ii) if the vehicle brake pedal is depressed, applying brake force to the vehicle wheels responsive to the depression of the brake pedal, wherein the applied brake force is modified to at least two of the vehicle wheels to create a left-right brake torque differential responsive to the yaw torque command.

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