This paper discusses an in-car warning system which indicates the occurrence of excessive engine misfires by analyzing the ionization signals obtained from each spark plug's center electrode. A prototype model of this design has been built and evaluated on a 2000 cc, 1973 production four-cylinder engine. Reliable operation was achieved from idle to 6000 rpm. The system consists of two basic elements, adapters for each cylinder that fit into the distributor cap for obtaining the combustion signals, and a simple electronic circuit for analyzing these signals and activating a warning light. Since the adaptors consist only of a 20 M OMEGA isolation resistor and a connector, they could easily be designed as an integral part of the distributor cap. Such an instrument should be useful as a warning indicator to inform the operator that the engine is in need of repair.

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  • Corporate Authors:

    Institute of Electrical and Electronics Engineers (IEEE)

    3 Park Avenue, 17th Floor
    New York, NY  United States  10016-5997
  • Authors:
    • Johnson, W J
    • Rado, W G
  • Publication Date: 1978-2

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Filing Info

  • Accession Number: 00180117
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Oct 12 1978 12:00AM