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APPARATUS FOR CONTROLLING THE SPEED AND SPACING OF VEHICLES

  • US 3,835,950 A
  • Filed: 09/25/1972
  • Issued: 09/17/1974
  • Est. Priority Date: 09/23/1971
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling a vehicle comprising:

  • distance measuring means for measuring the distance between a lead vehicle and a following vehicle and for generating a signal proportional to said distance;

    speed measuring means for measuring the speed of said lead vehicle and for generating a signal proportional to said speed;

    circuit means for producing an output signal means for providing an output signal proportional to the square root of the sum of said signal proportional to said distance and the square of said signal proportional to said speed; and

    , control means for controlling said vehicle in response to said output signal from said circuit means wherein said speed measuring means comprises;

    a moving element coupled to said vehicle;

    a plurality of ground elements spaced a predetermined distance apart for generating vehicle passing signals as said moving element passes each of said ground elements;

    oscillator means for generating a periodic output signal having a period shorter than that of said vehicle passing signals;

    counting means for repeatedly counting said oscillator output during the presence of said vehicle passing signal; and

    memory means for storing the maximum counts accumulated in said counting means.

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