Vehicle occupant characterization method based on sensed occupant weight

  • US 6,246,936 B1
  • Filed: 10/05/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 10/05/1999
  • Status: Expired due to Term
First Claim
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1. A method of distinguishing between a vehicle occupant and a cinched child seat in an occupant weight detection system that provides an output signal responsive to weight applied to a vehicle seat, the method comprising the steps of:

  • computing a variance of the output signal and a running average of said variance;

    detecting vehicle movement;

    comparing the average variance to a predefined threshold when vehicle movement is detected and the output signal is within a range that could be produced by either a vehicle occupant or a cinched child seat;

    determining that a cinched child seat is present if the average variance is below the predefined threshold; and

    determining that a vehicle occupant is present if the average variance is above the predefined threshold.

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