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Apparatus and method for diagnosing and controlling an ignition system of an internal combustion engine

  • US 6,408,242 B1
  • Filed: 06/22/2000
  • Issued: 06/18/2002
  • Est. Priority Date: 12/11/1997
  • Status: Expired due to Term
First Claim
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1. A system for detecting ignition system failures, comprising:

  • an ignition coil having a primary coil coupled to a secondary coil;

    means for energizing said primary coil to thereby induce a spark voltage in a high tension side and an ion voltage in a low tension side of said secondary coil;

    an ion sensor associated with said low tension side of said secondary coil, said ion sensor sensing said ion voltage and producing an ion voltage signal corresponding thereto; and

    a computer having an input receiving said ion voltage signal, said computer analyzing said ion voltage signal and determining therefrom a combustion quality value associated with said spark voltage.

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