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Brake control apparatus in diagonal braking pressure supply system for use in motor vehicles

  • US 5,021,957 A
  • Filed: 11/09/1989
  • Issued: 06/04/1991
  • Est. Priority Date: 11/10/1988
  • Status: Expired due to Fees
First Claim
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1. A brake apparatus for use in a motor vehicle having at least one font-side wheel and at least one rear-side wheel, comprising:

  • a braking pressure supply system including a master cylinder of said vehicle for generating a braking pressure in response to operation of a braking pedal of said vehicle, front-side and rear-side wheel braking cylinders for applying braking forces to said front -side wheel and rear-side wheel, and first and second supply passage for conducting braking pressure generated by said master cylinder to said front-side and rear-side wheel braking cylinders, respectively.braking pressure adjusting means, provided in said braking pressure supply system, for adjusting the braking pressure to be applied to said front-side and rear-side wheel braking cylinders in accordance with a drive signal;

    first sensor means for sensing a speed of said front-side wheel and generating a first detection signal indicative of the sensed speed of said front-side wheel;

    second sensor means for sensing a speed of said rear-side wheel and generating a second detection signal indicative of the sensed speed of said front-side wheel;

    proportioning valve means, provided in said second supply passage of said braking pressure supply system, for controlling the braking pressure to be applied to said rear-side wheel braking cylinder in accordance with a control signal so as to vary the ratio of the braking pressure to said rear-side wheel braking cylinder with respect to the braking pressure to be applied to said front-side wheel braking cylinder; and

    electronic control means, responsive to said first and second detection signals for producing said control signal and said drive signal, said electronic control means including;

    first lock-tendency calculation means for calculating a lock tendency of said front-side wheel on the basis of said first detection signal;

    second lock-tendency calculation means for calculating a lock tendency of said rear-side wheel on the basis of said second detection signal;

    parameter calculation means coupled to said first and second lock-tendency calculation means for determining a difference between said front-side wheel and rear-side wheel lock tendencies calculated in said first and second lock-tendency calculation means and generating a parameter indicative thereof;

    command-value calculation means for calculating a command value by integrating the parameter;

    first output means for outputting to said braking pressure adjusting means said drive signal determined in accordance with the lock tendencies calculated by said first and second lock-tendency calculation means; and

    second output means for outputting to said proportioning valve means said control signal determined in accordance with the command value.

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