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Method for demonstrating reliability of occupant classification systems

  • US 6,771,175 B1
  • Filed: 12/06/2002
  • Issued: 08/03/2004
  • Est. Priority Date: 12/06/2002
  • Status: Expired due to Term
First Claim
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1. A method for estimating reliability of a system which classifies an occupant of a vehicle seat as an adult or a child based on output signals of at least one sensor that measures a parameter that characterizes said occupant, by comparing measured parameter values to a selected threshold value, said method comprising:

  • providing a first test object having a measurable parameter value that represents a lower boundary limit for an adult;

    providing a second test object having a measurable parameter value that represents an upper boundary limit for a child, said upper boundary limit being smaller than said lower boundary limit for an adult;

    testing each of a plurality of n said systems comprising a sample, using said first and second test objects to generate n first measured values and n second measured values, respectively;

    calculating average and standard deviation of said first measured values;

    calculating average and standard deviation of said second measured values;

    determining for the first test object a first margin which is calculated as the surplus of average of said first values minus a constant times the standard deviation of the first values beyond said threshold value;

    determining for the second test object a second margin which is calculated as the surplus of said threshold value beyond the average of the second values plus the constant times the standard deviation of the second values; and

    concluding that said system has a desired minimum reliability at a desired level of confidence if both of said first and second margins are positive.

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