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Corona igniter with specially shaped insulator

A technology of insulators and igniters, applied in corona discharge devices, circuits, spark plugs, etc., can solve problems such as exhausting corona discharge and reducing ignition quality

Inactive Publication Date: 2016-03-23
FEDERAL MOGUL IGNITION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive path between the center electrode and the case creates unwanted power-arcing and drains the remaining corona discharge which will degrade the ignition quality

Method used

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  • Corona igniter with specially shaped insulator
  • Corona igniter with specially shaped insulator
  • Corona igniter with specially shaped insulator

Examples

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Embodiment Construction

[0022] One aspect of the present invention provides a corona igniter 20 for use in a corona discharge ignition system. The igniter 20 includes a center electrode 22 for receiving a high radio frequency voltage and emitting a radio frequency electric field to ionize a portion of the fuel-air mixture in the combustion chamber 26 of the internal combustion engine and provide corona in the combustion chamber 26 of the internal combustion engine. Discharge 24. The corona igniter 20 includes an insulator 28 that houses the center electrode 22 and is surrounded by a metal casing 30 . The insulator 28 includes an outer insulator surface 32 having a partition 34 extending radially outward relative to the center electrode 22 . The partition 34 increases the local thickness of the insulator 28 in a direction moving from the housing 30 toward the insulator nozzle end 54 and is typically formed by a notch or a protrusion. The partition 34 repels positive and negative ions away from the i...

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Abstract

The invention relates to a corona igniter (20) for emitting a radio frequency electric field and providing a corona discharge (24), the corona igniter (20) comprising a central electrode (22) at a positive voltage, A grounded metal casing (30) and an insulator (28) with a partition (34) extending radially outward relative to the center electrode (22). The partition (34) generally increases the local thickness (t) of the insulator (28) by at least 15% in the range of less than 25% of the nozzle length (l) of the nozzle region (74) of the insulator. The partition (34) is generally a side edge (82) of the protrusion or recess, and the side edge (82) faces the housing (30). The partition (34) reverses the electric field and potential gradient along the outer surface of the insulator (32) to repel charged ions away from the insulator (28), thereby preventing the formation of Conductive pathway.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 422,833, filed December 14, 2010. technical field [0003] The present invention generally relates to a corona igniter for emitting a radio frequency electric field to ionize a fuel-air mixture and provide a corona discharge, and a method of making the igniter. Background technique [0004] A corona discharge ignition system consists of a corona igniter with a center electrode charged to a high radio frequency potential to generate a strong radio frequency electric field in the combustion chamber. This electric field ionizes a portion of the fuel and air mixture in the combustion chamber and initiates dielectric breakdown, thereby promoting combustion of the fuel-air mixture. The electric field is preferably controllable to maintain the dielectric properties of the fuel-air mixture and to generate a corona discharge (also known as a low temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/50
CPCH01T13/50H01T19/00H01T21/00
Inventor 约翰·A·鲍里斯詹姆斯·D·吕科瓦基
Owner FEDERAL MOGUL IGNITION
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