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Method for diagnosing an engine using a computer based boost pressure model

  • US 5,526,266 A
  • Filed: 10/13/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 12/19/1991
  • Status: Expired due to Term
First Claim
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1. A method for diagnosing an engine having an exhaust manifold and a turbocharger by modeling boost pressure, including the steps of:

  • sensing a boost pressure of said turbocharger and responsively delivering an measured boost pressure signal;

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

    receiving said at least one parameter signal and responsively determining a modeled exhaust temperature value;

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

    receiving said at least one other parameter signal and said modeled exhaust temperature value and responsively determining a modeled boost pressure value;

    receiving said measured boost pressure signal and said modelled boost pressure signal, comparing said measured boost pressure signal and said modeled boost pressure value and responsively producing a difference signal; and

    receiving said difference signal and responsively diagnosing said engine.

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