Real time self-adjusting calibration algorithm

  • US 6,895,263 B2
  • Filed: 05/08/2002
  • Issued: 05/17/2005
  • Est. Priority Date: 02/23/2000
  • Status: Expired due to Term
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1. A method of calibrating sensor data collected from a sensor, wherein a calibration formula based on past calibrations is used to interpret the sensor data, the method comprising the steps of:

  • obtaining a calibration reference value for the sensor;

    calculating a current calibration factor based on the calibration reference value and a current sensor data point;

    identifying either a possible error or change in sensitivity in the sensor from the current calibration factor; and

    confirming a sensor failure or recognizing a change in sensor sensitivity by comparing the current calibration factor with an estimated value for the current calibration factor to determine whether the current calibration factor was unexpected, wherein the estimated value for the current calibration factor is determined from the calibration formula and a past calibration factor; and

    confirming the sensor failure when at least two unexpected calibration factors are received in succession without supporting each other.

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