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Method for calibrating WIM-sensors

  • US 9,851,241 B2
  • Filed: 03/24/2011
  • Issued: 12/26/2017
  • Est. Priority Date: 04/01/2010
  • Status: Active Grant
First Claim
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1. A method for calibrating a WIM (Weigh in Motion) sensor built into a road, the sensor being suitable for determining the dynamic and/or static weight of a vehicle as it is passing over the WIM-sensor, the method comprising:

  • static wheel force data is obtained from a measuring wheel of a calibrating vehicle, which measuring wheel includes a hub and a rotating wheel force dynamometer, which rotates with the hub of the measuring wheel and includes rim-side and hub-side adaptions, while the calibrating vehicle is in a stationary position and the measuring wheel is not rotating;

    transmitting the measured static wheel force data to an evaluating unit;

    while passing the calibrating vehicle over the road and the WIM sensor, obtaining dynamic wheel force data from directly measuring at the measuring wheel the dynamic wheel force on the road;

    transmitting the dynamic wheel force data to the evaluating unit;

    using the evaluating unit to ascertain the differences between the dynamic wheel force data and the static wheel force data to generate corrected dynamic wheel force data;

    while passing the measuring wheel of the calibrating vehicle over the road and the WIM sensor, WIM signal data generated by the WIM sensor are transmitted to the evaluating unit;

    using the evaluating unit to synchronize the corrected dynamic wheel force data with the WIM signal data;

    using the evaluating unit to compare the corrected dynamic wheel force data that has been synchronized with the WIM signal data and generate from the comparison a calibration function that accounts for the differences between the dynamic wheel force data and the static wheel force data; and

    using the calibration function to calibrate the WIM sensor.

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