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Apparatus and method to detect cylinder faults of internal combustion engines via exhaust temperature monitoring

  • US 6,675,639 B1
  • Filed: 10/25/2000
  • Issued: 01/13/2004
  • Est. Priority Date: 10/25/2000
  • Status: Active Grant
First Claim
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1. A method for detecting a fault in a cylinder of an internal combustion engine, comprising the steps of:

  • (a) collecting temperature data representative of temperatures of exhaust from the cylinder;

    (b) estimating true temperatures of the exhaust as a function of the collected temperature data and at least one compensation factor;

    (c) determining deviations of the estimated true temperatures from at least one reference value; and

    (d) determining at least one severity symptom value for the cylinder as a function of the deviations determined, and comparing the at least one severity symptom value with at least one predetermined reference value for a known cylinder condition.

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