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IGNITION DEVICE CONTROLLING STREAMER DISCHARGE AND ARC DISCHARGE

  • US 20170096979A1
  • Filed: 10/05/2016
  • Published: 04/06/2017
  • Est. Priority Date: 10/06/2015
  • Status: Active Grant
First Claim
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1. An ignition device comprising:

  • an ignition plug that produces plasma discharge between a pair of discharge electrodes so as to ignite a combustible mixture in a combustion chamber of an internal combustion engine;

    an ignition coil provided with a primary coil and a secondary coil, the secondary coil applying voltage between the pair of discharge electrodes of the ignition plug;

    a voltage applying unit that applies alternating current voltage to the primary coil, a frequency of the alternating current voltage being set so as to produce voltage resonance in a circuit including the ignition plug and the secondary coil, whereinthe voltage applying unit sets an output period of the alternating current voltage to be longer than a first period at which a partial breakdown start to occur due to a discharge at the pair of discharge electrodes, and shorter than a second period at which a total breakdown occurs due to a discharge at the pair of discharge electrodes, when an air/fuel ratio of the internal combustion engine is lower than a predetermined threshold.

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