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System for detecting occurrence of an event when the slope of change based upon difference of short and long term averages exceeds a predetermined limit

  • US 6,463,347 B1
  • Filed: 07/08/1999
  • Issued: 10/08/2002
  • Est. Priority Date: 09/15/1997
  • Status: Expired due to Term
First Claim
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1. A method for detecting an occurrence of an event in a target system based upon sequentially recorded values of at least one operational variable of said target system, said operation variable providing an indication of one or more conditions of the target system which change in response to the event, said method comprising the steps of:

  • (a) calculating a pair of a short term average and a long term average of said values wherein said long term average includes values in addition to those included in said short term average;

    (b) calculating the difference between said pair;

    (c) reiterating steps (a) and (b) at least once wherein each reiterated pair of short and long term averages includes at least one value that is more recent Oman any value included in a previously calculated pair of short and long term averages; and

    (d) calculating the change in the differences calculated in step (b) over the change in the number of sequentially recorded values to determine slope and indicating the occurrence of an event if said slope exceeds a predetermined limit.

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