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US 10,629,368 B2Granted
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.
Claims14
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,
- wherein a first terminal of the sub-primary coil is connected to the power source and a second terminal of the sub-primary coil is connected to the sub-switching device, and
- wherein a gate voltage of the sub-switching device is controlled based on detection of the current flowing in the sub-primary coil.
7 more elements
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;
- a current limiting resistor having a first terminal connected to a first terminal 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 by the current limiting resistor,
- wherein a second terminal of the sub-primary coil is connected to the power source and a second terminal of the current limiting resistor is connected to the sub-switching device.
7 more elements
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
- wherein a current flowing in the sub-primary coil is limited by increasing a voltage between a collector and an emitter of the sub-switching device.
6 more elements
Dependencies are inferred from the claim text.