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Bridge weigh-in-motion system

  • US 5,111,897 A
  • Filed: 09/27/1990
  • Issued: 05/12/1992
  • Est. Priority Date: 09/27/1990
  • Status: Expired due to Fees
First Claim
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1. A self-operating apparatus for weighing a moving vehicle, comprising:

  • a plurality of strain gauges adapted to be attached to existing bridge structures, each of said strain gauges adapted to sense strain sustained by said bridge structure when a vehicle passes thereover, and outputting an analog strain signal in response to said strain;

    at least one pair of axle sensors, each of said axle sensors adapted to automatically sense a vehicle axle passing thereover and output an axle sense signal in response thereto;

    means for converting said analog strain signal to a digital strain signal;

    central processing circuitry adapted to (i) perform first computations on said axle sense signal to determine vehicle speed and vehicle axle spacing, and (ii) perform second computations on said digital strain signal and said axle sense signal to determine vehicle weight, said central processing circuitry further adapted to output results of said first and second computations;

    random access memory circuitry directly accessible by a digital computer and adapted to receive and retain said results of said first and second computations;

    means to supply power to said strain gauges, said axle sensors, said signal converting means, said central processing circuitry, and said random access memory circuitry; and

    electrical interconnection means for electronically interconnecting said means to supply power, said strain gauges, said axle sensors, said signal converting means, said central processing circuitry and said random access memory circuitry.

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