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Antiskid brake control system having malfunction protection

  • US 3,920,280 A
  • Filed: 05/23/1974
  • Issued: 11/18/1975
  • Est. Priority Date: 08/10/1973
  • Status: Expired due to Term
First Claim
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1. A vehicle antiskid brake control system comprising:

  • a. first means for providing wheel velocity signals according to the speeds of rotation of the individual wheels of the vehicle;

    b. means for forming a reference velocity signal from a wheel velocity signal of at least one wheel of the vehicle as an approximation of the vehicle speed;

    c. means for comparing said wheel velocity signals of the individual wheels with said reference velocity signal to obtain a wheel Skid control signal when differences therebetween occur so as to effect modulation of brake pressure at whichever wheel is providing said wheel velocity signal different than said reference velocity signal;

    wherein the improvement comprises;

    d. second means in parallel with said first means for providing additional wheel velocity signals according to the speeds of rotation of the individual wheels of the vehicle in addition to said first mentioned wheel velocity signals thereof and e. said means for forming a reference velocity signal including third means for selecting the lower one of said additional and said first mentioned velocity signals of said at least two wheels for use in forming said reference velocity signal.

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