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System and method for processing test measurements collected from an internal combustion engine for diagnostic purposes

  • US 5,361,628 A
  • Filed: 08/02/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 08/02/1993
  • Status: Expired due to Fees
First Claim
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1. A method for cold testing an internal combustion engine comprising the steps of:

  • cranking the engine at a predetermined speed for a predetermined number of revolutions;

    monitoring an operational parameter of the engine during said predetermined number of revolutions;

    producing an electrical signal representing said operational parameter;

    preprocessing said electrical signal to produce a principle component value vector signal representing said operational parameter; and

    analyzing said principle component value vector signal to produce a classification signal indicating, based on the operational parameter, whether the engine is normal or faulty.

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