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Method for diagnosing an engine using computer based models

  • US 5,377,112 A
  • Filed: 12/19/1991
  • Issued: 12/27/1994
  • Est. Priority Date: 12/19/1991
  • Status: Expired due to Fees
First Claim
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1. A method for diagnosing an engine, including the steps of:

  • sensing a first operating characteristic of said engine and responsively delivering a first operating characteristic signal;

    sensing at least one parameter of said engine and responsively producing at least one parameter signal;

    receiving said at least one parameter signal and responsively determining a modeled value of said first operating characteristic;

    receiving said first operating characteristic signal, comparing said first operating characteristic signal and said first operating characteristic modeled value and responsively producing a first difference signal;

    sensing a second operating characteristic of said engine and responsively delivering a second operating characteristic signal;

    sensing at least one other parameter of said engine and responsively producing at least one other parameter signal;

    receiving said at least one other parameter signal and responsively determining a modeled value of said second operating characteristic;

    receiving said second operating characteristic signal, comparing said second operating characteristic signal and said second operating characteristic modeled value and responsively producing a second difference signal; and

    receiving said first and second difference signals, comparing said first and second difference signals, and responsively diagnosing said engine.

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