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Method and apparatus for detecting fault conditions in a vehicle data recording device to detect tampering or unauthorized access

  • US 5,586,130 A
  • Filed: 10/03/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 10/03/1994
  • Status: Expired due to Term
First Claim
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1. In a vehicle including one or more vehicle sensors for monitoring one or more operational parameters of said vehicle, said vehicle including a recording device for collecting vehicle operation data produced by said one or more vehicle sensors, a method for detecting fault conditions within said recording device comprising the steps of:

  • providing a wake-up signal during each of a sequence of intervals of predefined duration;

    storing a current time value in response to each said wake-up signal when said recording device is provided with a source of main power;

    determining time differences between consecutive ones of said stored time values; and

    comparing said time differences to said predefined duration, and registering a power loss fault condition when at least one of said time differences exceeds said predefined duration.

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