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Anti-locking control system for simultaneous regulation of steered wheels or wheels on a diagonal of vehicle

  • US 3,980,346 A
  • Filed: 07/10/1975
  • Issued: 09/14/1976
  • Est. Priority Date: 07/10/1974
  • Status: Expired due to Term
First Claim
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1. In an anti-locking control system for the brakes of a four wheel vehicle having dual brake circuits controlled by a single master cylinder and with each brake circuit connected to the brakes associated with two of said wheels, said control system including, a brake pressure regulating unit connected in one of said brake circuits for jointly regulating the brake pressure at the brakes of the two of said wheels associated with said one brake circuit, means for sensing the rotational behavior of two diagonally opposite ones of said wheels, and circuit means, connected to said sensing means, for evaluating the output signals from said sensing means and for generating brake pressure control signals for controlling said pressure regulating unit, the improvement wherein said two wheel brakes connected to said one brake circuit are the brakes associated with said diagonally opposite wheels whose rotational behavior is being sensed or the brakes associated with the steered wheels of the vehicle;

  • and wherein said anti-locking control system further includes;

    switching means connected to said control circuit means for alternatingly producing a first operating state of said control circuit in which the pressure is regulated when there is a tendency to lock at one wheel whose rotational behavior is sensed and a second operating state in which the pressure is regulated when there is a tendency to lock at both wheels whose rotational behavior is sensed;

    a normally open brake pressure control valve connected in the other of said dual brake circuits; and

    means responsive to the pressure (PST) at the two brakes connected to the output of said brake pressure control valve and to the pressure (PR) at the output of said brake pressure regulating unit, for closing said brake pressure control valve when the pressure PST has a given relationship to the pressure PR.

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