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Hierarchical brake controller

  • US 4,850,650 A
  • Filed: 09/02/1988
  • Issued: 07/25/1989
  • Est. Priority Date: 09/02/1988
  • Status: Expired due to Fees
First Claim
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1. A system for controlling the brake pressure applied to the brakes of the front and rear wheels of a vehicle, the system comprising in combination:

  • means for generating a brake pressure command value Pc in accord with an operator commanded braking value;

    means for generating a front brake pressure command Pcf having a value Y*Pc where Y is a desired front-to-rear proportioning brake pressure ratio;

    means for generating a rear brake pressure command Pcr having a value (1-Y)Pc ;

    front brake pressure control means for controlling the brake pressure applied to each of the front wheel brakes to the value Pcf ;

    rear brake pressure control means, the rear brake pressure control means including means for controlling the brake pressure applied to each of the rear wheel brakes to the lesser of the value Pcr or a value Prm determined to prevent a rear wheel lock-up condition; and

    means for limiting the brake pressure command value Pc to a maximum value Pcm having a value (1/(1-Y))Prm, whereby the front brake pressure command Pcf is limited to a value preventing front wheel lock-up based on the rear brake pressure value Prm determined to prevent a rear wheel lock-up.

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