IGNITION DEVICE CONTROLLING STREAMER DISCHARGE AND ARC DISCHARGE
First Claim
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.
2 Assignments
0 Petitions
Accused Products
Abstract
An ignition device includes: an ignition plug producing plasma discharge between a pair of discharge electrodes of an ignition plug; an ignition coil provided with a primary coil and a secondary coil, the secondary coil applying voltage between the pair of discharge electrodes; a voltage applying unit applying alternating current voltage to the primary coil, a frequency of the alternating current voltage being set to produce voltage resonance in a circuit including the ignition plug and the secondary coil. The 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 at the pair of discharge electrodes, and shorter than a second period at which a total breakdown occurs at the pair of discharge electrodes, when an air/fuel ratio is lower than a predetermined threshold.
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Citations
11 Claims
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1. An ignition device comprising:
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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, wherein the 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification