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Electronic brake proportioning for a rear wheel anti-lock brake system

  • US 6,241,326 B1
  • Filed: 10/25/1999
  • Issued: 06/05/2001
  • Est. Priority Date: 10/28/1998
  • Status: Expired due to Term
First Claim
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1. A system for controlling a rear wheel brake of a vehicle, the system comprising:

  • a master cylinder operable by a vehicle operator to supply pressurized brake fluid;

    at least one front wheel brake connected to said master cylinder;

    a normally open isolation valve having an inlet port and an outlet port, said inlet port connected to said master cylinder;

    at least one rear wheel brake connected to said isolation valve outlet port;

    a speed sensor which generates a signal proportional to the speed of the rear wheel associated with said rear wheel brake; and

    a controller connected to said speed sensor and said isolation valve, said controller being responsive to said wheel speed sensor signals to calculate an estimated vehicle deceleration and, upon said estimated vehicle deceleration exceeding a predetermined first deceleration threshold during a braking cycle, being operable to close said isolation valve to block further increases of the pressure applied to said rear wheel brake, said controller being further operable, subsequent to said closure of said isolation valve, to continue to calculate said estimated vehicle deceleration and, upon said estimated vehicle deceleration exceeding a second vehicle deceleration threshold which is greater than said first vehicle deceleration threshold, said controller is operable to selectively open said isolation valve to allow an increase of the pressure applied to said rear wheel brake, whereby the braking force is proportioned between said front and rear wheel brakes.

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