High frequency discharge ignition device

Patent metadata

Field	Value
Publication number	US-10320159-B2
Application number	US-201715710899-A
Country	US
Kind code	B2
Filing date	Sep 21, 2017
Priority date	Mar 23, 2017
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

By grounding a metal first housing, radiation noise generated from the coupling circuit is shielded. Further, by enclosing the first housing in a metal second housing in a manner such that the first housing and the second housing do not come into contact with each other, and grounding the second housing by connecting the second housing to an engine block, radiation noise generated by the capacitive component between the coupling circuit and the first housing is shielded by the second housing. As a result, the influence of this noise on peripheral devices of the high frequency discharge ignition device can be suppressed.

First claim

What is claimed is:

1. A high frequency discharge ignition device in which high frequency energy supplied from a high frequency energy supply circuit is coupled to a high voltage pulse supplied from an ignition coil and supplied to a spark plug connected to an engine block,
the high frequency discharge ignition device comprising:
an output device that includes a coupling circuit supplying the coupled energy to the spark plug;
a first housing in which the output device is housed; and
a second housing that is connected to the engine block, the second housing and the engine block being formed separately from each other, wherein
the output device is directly attached to the spark plug,
the first housing and the second housing are respectively formed from metal,
the first housing is grounded,
the first housing is enclosed in the second housing, and
the first housing is separated from the second housing by a gap such that the first housing is not in electrical contact with the second housing in a portion other than through the engine block.

2. The high frequency discharge ignition device according to claim 1 , wherein
the first housing is grounded by being electrically connected to the spark plug or the engine block.

3. The high frequency discharge ignition device according to claim 1 , wherein
the coupling circuit is resin-molded inside a resin inner housing, and
the inner housing is housed in the first housing.

4. The high frequency discharge ignition device according to claim 2 , wherein
the coupling circuit is resin-molded inside a resin inner housing, and
the inner housing is housed in the first housing.

5. The high frequency discharge ignition device according to claim 1 , wherein
the second housing includes a main body portion and a cover portion, and
the high frequency energy supply circuit is built into the cover portion.

6. The high frequency discharge ignition device according to claim 2 , wherein
the second housing includes a main body portion and a cover portion, and
the high frequency energy supply circuit is built into the cover portion.

7. The high frequency discharge ignition device according to claim 3 , wherein
the second housing includes a main body portion and a cover portion, and
the high frequency energy supply circuit is built into the cover portion.

8. The high frequency discharge ignition device according to claim 4 , wherein
the second housing includes a main body portion and a cover portion, and
the high frequency energy supply circuit is built into the cover portion.

9. The high frequency discharge ignition device according to claim 5 , wherein
the cover portion is fixed to the main body portion.

10. The high frequency discharge ignition device according to claim 6 , wherein
the cover portion is fixed to the main body portion.

11. The high frequency discharge ignition device according to claim 7 , wherein
the cover portion is fixed to the main body portion.

12. The high frequency discharge ignition device according to claim 8 , wherein
the cover portion is fixed to the main body portion.

13. The high frequency discharge ignition device according to claim 1 , wherein
a ventilation hole is provided in the second housing.

14. The high frequency discharge ignition device according to claim 2 , wherein
a ventilation hole is provided in the second housing.

15. The high frequency discharge ignition device according to claim 3 , wherein
a ventilation hole is provided in the second housing.

16. The high frequency discharge ignition device according to claim 4 , wherein
a ventilation hole is provided in the second housing.

17. The high frequency discharge ignition device according to claim 5 , wherein
a ventilation hole is provided in the second housing.

18. The high frequency discharge ignition device according to claim 6 , wherein
a ventilation hole is provided in the second housing.

19. The high frequency discharge ignition device according to claim 7 , wherein
a ventilation hole is provided in the second housing.

20. The high frequency discharge ignition device according to claim 12 , wherein
a ventilation hole is provided in the second housing.

Assignees

• Mitsubishi Electric Corp

Inventors

• Shimizu Yasuyuki
• Tanaka Takaaki
• Nakagawa Akira

Classifications

• H01T13/41 Primary

  with interference suppressing or shielding means · CPC title

• F02P9/007

  by supplementary electrical discharge in the pre-ionised electrode interspace of the sparking plug, e.g. plasma jet ignition · CPC title

• H01T13/44

  with transformers, e.g. for high-frequency ignition · CPC title

• F02P15/001

  Ignition installations adapted to specific engine types (ignition of jet propulsion plants F02K9/95; for rotary piston engines F02B53/12) · CPC title

• H01T13/06

  Covers forming a part of the plug and protecting it against adverse environment · CPC title