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US 2019/0311849 A1Published application
Ignition apparatus
AssigneeMitsubishi Electric Corporation
InventorsTakashi IDOGAWA, Naoki KATAOKA, Yuichi MURAMOTO
Life of this patent
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Abstract
A current flowing in a sub-primary coil can be limited in an ignition apparatus in which a voltage, generated in a secondary coil at a timing when a current in a main primary coil is cut off, generates a secondary current, and then the sub-primary coil is energized so that a superimposition current is generated in the secondary coil and in which a sub-IC connected in series with the sub-primary coil is pulse-controlled so that a current flowing in the sub-primary coil is controlled and hence the superimposition current is controlled.
Claims9
An ignition apparatus comprising:
- a main primary coil that generates positive-direction energization magnetic flux when energized by a power source and generates opposite-direction de-energization magnetic flux when de-energized;
- a main switching device that is connected with the main primary coil and performs switching between energization and de-energization of the main primary coil;
- a sub-primary coil that generates magnetic flux having a direction the same as that of the de-energization magnetic flux when energized by the power source;
- a sub-switching device that is connected with the sub-primary coil and performs switching between energization and de-energization of the sub-primary coil;
- and
- a secondary coil whose one terminal is connected with an ignition plug and that is magnetically coupled with the main primary coil and the sub-primary coil so as to generate discharge energy,
- wherein a voltage generated in the secondary coil at a timing when the main switching device is de-energized generates a secondary current;
- then, the sub-switching device is energized and hence the sub-primary coil is energized so that a superimposition current is generated in the secondary coil and a current flowing in the sub-primary coil is limited.
5 more elements
Dependencies are inferred from the claim text.