The electrical principle of operation, the geometrical and electrical circuit constraints on the design of, and the electrical and in-engine performance of a multigap spark plug developed for automotive applications are described.The electrical principle of operation is based on successively breaking down an array of spark gaps through the use of a resistive ladder network.The measurements evaluating the electrical performance of various multigap designs indicate that these plugs can deliver up to twice the energy of a single gap plug to the arcs, using the same ignition system. The increased amount of energy is also delivered in a shorter time than for single gap plugs.The measurements evaluating the in-engine performance of these plugs further indicate that improvements of up to 6% in fuel economy for a simulated CVS test run, the extension of the lean misfire limit by several A/F ratio numbers under various engine operating conditions, and improvements in driveability can be achieved compared to the performance of standard plugs under the same operating conditions.


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    Title :

    The Performance of a Multigap Spark Plug Designed for Automotive Applications


    Additional title:

    Sae Technical Papers


    Contributors:
    Turner, A. H. (author) / Bates, B. (author) / Amey, J. E. (author) / Rado, W. G. (author)

    Conference:

    1976 Automotive Engineering Congress and Exposition ; 1976



    Publication date :

    1976-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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