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Surge detection system using engine signature

  • US 5,726,891 A
  • Filed: 01/26/1994
  • Issued: 03/10/1998
  • Est. Priority Date: 01/26/1994
  • Status: Expired due to Term
First Claim
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1. A method of detecting an occurrence of a surge in a gas turbine engine, comprising the steps of:

  • during individual ones of a plurality of consecutively occurring time periods during an operation of a gas turbine engine,operating a first transducer to generate a first electrical signal for representing a first engine operating characteristic;

    processing the first electrical signal to obtain a derivative of the first engine operating characteristic;

    operating a second transducer to generate a second electrical signal for representing a second engine operating characteristic;

    processing the second electrical signal to obtain a derivative of the second engine operating characteristic;

    comparing the derivative of the first engine operating characteristic to a first threshold value;

    comparing the derivative of the second engine operating characteristic to a second threshold value;

    incrementing a counter by a predetermined value only if the derivative of the first engine operating characteristic exceeds the first threshold value and if the derivative of the second engine operating characteristic exceeds the second threshold value;

    else, if at least one of the first and second threshold values is not exceeded,decrementing the counter by the predetermined value; and

    generating an output electrical signal for indicating an occurrence of a surge condition only if a value of the counter is equal to a predetermined value.

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