US 11,393,622 B2Granted

Ignition apparatus

AssigneeMitsubishi Electric Corporation

InventorsYuichi Muramoto, Kimihiko Tanaya, Naoki Kataoka, Yusuke Naruse

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Abstract

There is provided an ignition apparatus that makes it possible that after a spark discharge starts, a secondary current is reduced so that a plug is suppressed from being consumed. The ignition apparatus is provided with an ignition coil including a primary coil, a secondary coil, and a tertiary coil, a first switching circuit for performing on/off-switching of energization of the primary coil from a power source, a second switching circuit for performing on/off-switching of energization of the tertiary coil, and a controller that performs on/off-control of the first switching circuit so as to generate a secondary current in the secondary coil, thereby causing a spark discharge in an ignition plug, and then turns on the second switching circuit so as to reduce the secondary current through a change in flux in the tertiary coil.

Claims20

Dependent claims

An ignition apparatus comprising:

an ignition coil including
a primary coil,
a secondary coil that is magnetically coupled with the primary coil and supplies a secondary current to an ignition plug, and
a tertiary coil that is magnetically coupled with the primary coil and the secondary coil and generates energization flux for reducing the secondary current;
a first switching circuit for performing on/off-switching of energization of the primary coil from a power source;
a second switching circuit for performing on/off-switching of energization of the tertiary coil;
and
a controller that performs on/off-control of the first switching circuit so as to generate the secondary current in the secondary coil through a change in flux generated in the primary coil, thereby causing a spark discharge in the ignition plug and that performs on/off-switching of the second switching circuit after the secondary current has been generated, thereby reducing the secondary current through a change in flux in the tertiary coil.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/914,606Filed 29 Jun 2020
Priority: JP JP2019-16584712 Sep 2019
Published: US 2021/0082618 A118 Mar 2021
Granted: 19 Jul 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H01F 38/12
Adaptations of transformers or inductances for specific applications or functions: ignition, e.g. for IC engines
F02P 3/01
Other installations: electric spark ignition installations without subsequent energy storage, i.e. energy supplied by an electrical oscillator
F02P 3/0414
Opening or closing the primary coil circuit with electronic switching means: using digital techniques
F02P 3/05
Layout of circuits: for control of the magnitude of the current in the ignition coil