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Pump-less hydraulic brake system for automobiles

  • US 4,418,966 A
  • Filed: 02/25/1982
  • Issued: 12/06/1983
  • Est. Priority Date: 03/12/1981
  • Status: Expired due to Fees
First Claim
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1. A pump-less hydraulic brake system for vehicles having a pair of front wheels and a pair of rear wheels, and a pair of front wheel brakes and a pair of rear wheel brakes associated therewith, comprising:

  • (a) master brake cylinder means for providing pressurized brake fluid;

    (b) a pair of independent brake lines, each connected to receive pressurized fluid from said master cylinder means, wherein each brake line is connected to deliver fluid to one front wheel brake and has a portion to deliver fluid to a diagonally opposed rear wheel brake;

    (c) a control valve means disposed in each of said brake lines, wherein each said control valve means has an electrically connectable inlet valve and an electrically connectable outlet valve, and said inlet and outlet valves in each said control valve means are actuatable to one of a first combination, in which the fluid pressure in the respective brake line follows the pressure predetermined by the master brake cylinder, a second combination, in which the fluid pressure in the respective brake line drops, and a third combination, in which the fluid pressure in the respective brake line remains at the pressure prevailing at the start of said third combination;

    (d) a pair of electrically connectable rear brake inlet valves, one disposed in the portion of each brake line leading to its respective rear wheel brake, which when actuated limits the fluid pressure in the associated rear wheel brake to the pressure prevailing when actuated;

    (e) means responsive to vehicle weight for controlling said rear brake inlet valves independent of other control commands to said rear brake inlet valves;

    (f) sensor means associated with each wheel for detecting the respective wheel'"'"'s rotational speed and angular deceleration; and

    (g) control circuit means for receiving signals from each said sensor means and for selectively actuating the inlet and outlet valves of said control valve means and said rear brake inlet valves as a function of one of the magnitude of said signals and the ratio of said signals, wherein at any single time only one of the two control valve means is actuatable to said second combination.

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