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Spark plug cap with misfire detecting capacitor for internal combustion engine

  • US 5,363,046 A
  • Filed: 02/02/1993
  • Issued: 11/08/1994
  • Est. Priority Date: 02/06/1992
  • Status: Expired due to Term
First Claim
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1. A spark plug cap for engaging and covering a terminal of a spark plug for an internal combustion engine, said spark plug cap comprising:

  • a first conductor selectively electrically connected to an ignition coil and to the spark plug terminal for carrying ignition voltage current from the ignition coil to the spark plug terminal, to thereby generate an electric spark between spark plug electrodes; and

    an insulator surrounding the first conductor;

    a second conductor radially located around a portion of the first conductor, wherein a predetermined distance is maintained from the first conductor such that a capacitor, which constitutes a capacitive divider with a capacitor for ignition voltage detection, is formed with the first and the second conductors,wherein the first conductor, a portion of the insulator, and the second conductor are integrated in a cap portion of said spark plug cap, and wherein said cap portion is configured to engage and cover the terminal of the spark plug at a distal end of the first conductor to provide the electrical connection of the first conductor to the spark plug terminal.

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