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Circuit arrangement for a brake system with electronic brake force distribution control

  • US 5,887,957 A
  • Filed: 02/24/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 05/21/1994
  • Status: Expired due to Term
First Claim
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1. A circuit arrangement for a vehicle having front wheels, rear wheels, brakes associated with the front wheels and the rear wheels, and a brake system with adjustment of the brake force distribution to the brakes associated with the rear wheels, said circuit arrangement comprising:

  • electrically controllable hydraulic valves inserted in pressure fluid conduits leading to and from the front-wheel brakes and the rear-wheel brakes;

    means for developing indications of the speed of the front wheels and the rear wheels of the vehicle in the form of front-wheel and rear-wheel speed signals; and

    valve control means responsive to the front-wheel speed indications and the rear-wheel speed indications;

    (A) for;

    (a) determining deceleration values of the rear wheels in the form of rear-wheel deceleration signals,(b) determining at least one of;

    (1) a deceleration value of the vehicle in the form of a vehicle deceleration signal, and(2) a reference quantity representative of the approximate deceleration value of the vehicle in the form of an approximate deceleration signal,(c) comparing the deceleration values of the rear wheels with at least one of;

    (1) the deceleration value of the vehicle, and(2) the reference quantity representative of the approximate deceleration value of the vehicle, to develop comparison output signals,(d) evaluating a discrepancy of the rear-wheel deceleration values from at least one of;

    (1) the vehicle deceleration value, and(2) the reference quantity representative of the approximate deceleration value of the vehicle, in the form of discrepancy signals,(e) generating, in response to a discrepancy evaluation, controls to actuate said electrically controllable hydraulic valves for control of brake force distribution, and(B) including;

    (a) first and second differentiating circuits to which a first of the rear-wheel speed signals and a second of the rear wheel speed signals, respectively, are supplied,(b) first and second low-pass filters to which output signals of said first and second differentiating circuits, respectively, are supplied, and(c) differentiator and integrator means for;

    (1) comparing output signals of said first and second low-pass filters, respectively, with at least one of;

    (i) the vehicle deceleration signal, and (ii) the approximate deceleration signal, and(2) developing the comparison output signals from which the control signals are developed to reduce, keep constant or increase further control of the braking pressure in the rear-wheel brakes as a function of the comparison output signals.

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