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Ion sensor glow plug assembly

  • US 6,285,007 B1
  • Filed: 08/18/1999
  • Issued: 09/04/2001
  • Est. Priority Date: 08/18/1999
  • Status: Expired due to Fees
First Claim
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1. An ion sensor glow plug assembly comprising:

  • a shell for attachment to a cylinder head of a compression ignition engine and having a passageway extending axially therethrough;

    a center terminal disposed at least partially in said passageway of said shell and connected to a source of power to create a heating circuit;

    a glow sheath disposed at least partially in said passageway of said shell and about said center terminal to create an ion sensing circuit;

    an insulator disposed at least partially in said passageway of said shell and about a portion of said glow sheath and extending axially therefrom to clean off soot on said glow sheath; and

    a coating disposed about a portion of said glow sheath between said glow sheath and said shell to isolate said shell from said glow sheath.

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