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Hydraulic dual-circuit brake system for automobiles

  • US 4,740,039 A
  • Filed: 10/07/1986
  • Issued: 04/26/1988
  • Est. Priority Date: 04/17/1984
  • Status: Expired due to Fees
First Claim
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1. A hydraulic dual circuit brake system for automobiles, in particular passenger cars having front and rear wheels, comprising:

  • wheel brake means positioned at the front and rear wheels for arresting wheel motion;

    a master brake cylinder;

    a plurality of brake lines for transmitting brake pressure from the master brake cylinder to the wheel brake means to actuate the latter;

    brake pressure regulator means incorporating hydraulically operated switching off means with a hydraulic control inlet for switching off a reducing or limiting function of the brake pressure regulator means, said brake pressure regulator means being interposed between the wheel brake means for the rear wheels and the brake lines for transmitting brake pressure from the master brake cylinder thereto;

    brake slip regulation means, including;

    hydraulic means interposed between the master brake cylinder and the front and rear wheel brake means;

    sensor means at each of said front and rear wheels responsive to wheel movement behavior for providing a sensor signal output representative of the wheel movement behavior; and

    electronic anti-skid control and regulating means responsive to the sensor signal output for controlling the hydraulic means to affect the brake pressure transmitted by the hydraulic means on a locking-danger condition of at least one wheel, characterized in thatthe hydraulic control inlet of the hydraulically operated switching off means of the brake pressure regulator means is connected to said hydraulic means between said master brake cylinder and the rear wheel brake means and responsive to the brake pressure transmitted by the hydraulic means to the right front wheel brake means when danger of locking is detected by the anti-skid control and regulating means so as to modify the operation of the brake pressure regulator means to affect the brake pressure delivered to the brake means for the rear wheel, the electronic anti-skid control and regulating means being provided so as to control the hydraulic means to lower or maintain constant the brake pressure transmitted to the locking-endangered wheel brake means when the sensor means provides a sensor output signal which indicates that a front wheel is locking-endangered, said hydraulically operated switching off means being responsive to the lower brake pressure by modifying operation of the brake pressure regulator means to increase the brake pressure delivered to the rear wheel brake means.

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