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Ignition plug and ignition system provided with same

A technology of spark plugs and ground electrodes, which is applied in the field of ignition systems, can solve the problems of low input energy, and achieve the effects of less flame retardant effect, suppression of flame retardant effect, and promotion of combustibility

Active Publication Date: 2018-08-03
MITSUBISHI ELECTRIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the delivery of energy generated by the plasma spreads over the entire discharge space, so the delivery energy per unit volume is low
That is, the barrier discharge can be said to be a technique that can efficiently generate radicals, but the distribution of radicals tends to become uniform and thin.

Method used

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  • Ignition plug and ignition system provided with same
  • Ignition plug and ignition system provided with same
  • Ignition plug and ignition system provided with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0057] Hereinafter, the spark plug according to Embodiment 1 of the present invention and an ignition system provided with the spark plug will be described based on the drawings. figure 1 It is a cross-sectional view and a bottom view showing the spark plug of the first embodiment. Such as figure 1 As shown, the spark plug 1 of the first embodiment includes a rod-shaped high-voltage electrode 11, a first dielectric 12a covering a peripheral surface 11a of the high-voltage electrode 11, a cylindrical main body metal member 13, and a rod-shaped ground electrode 14.

[0058] The main body metal fitting 13 as the frame body of the spark plug 1 has a threaded portion 13a on its peripheral surface and is fixed to the inside of the partition wall 21 facing the combustion chamber 22 of the engine. The rod-shaped ground electrode 14 is connected to one end surface 13 b of the main body metal fitting 13. The main metal fitting 13 and the ground electrode 14 have the same ground potential a...

Embodiment approach 2

[0070] In the second embodiment of the present invention, use Figure 5 ~ Figure 7 , The spark plug 1 ( figure 1 ) Basic modification. In addition, in each figure, the same code|symbol is attached|subjected to the same or equivalent part in the figure, and description is abbreviate|omitted.

[0071] In order to generate a barrier discharge, a second dielectric 12b needs to be interposed between the high-voltage electrode 11 and the ground electrode 14. The second dielectric 12b may be any electrode. In the first embodiment described above, the high-voltage electrode 11 is covered with the second dielectric 12b, but it may be as Figure 5 As shown, the ground electrode 14 is covered by the second dielectric 12b to form a dielectric electrode. In this case, the end 11c of the high-voltage electrode 11 is exposed from the dielectric 12.

[0072] In addition, in Embodiment 1 described above, an example in which one rod-shaped ground electrode 14 is arranged is shown, but there may be ...

Embodiment approach 3

[0083] In the third embodiment of the present invention, the spark plug 1 ( figure 1 ) A modification of using Figure 8 ~ Figure 18 A description will be given of an example in which a protrusion or a small metal piece having a tip is provided on the surface of the high-voltage electrode 11, the second dielectric 12b, or the ground electrode 14 facing the discharge region 15. In addition, in each figure, the same reference numerals are attached to the same and corresponding parts in the figures, and the description is omitted.

[0084] in Figure 8 In the example shown, the ground electrode 14 is a metal electrode, and a first protrusion 16 is provided at a portion of the bent portion 14a facing the discharge area 15 and the first protrusion 16 has a tip that protrudes toward the discharge area 15. unit. In addition, in Picture 9 In the illustrated example, the ground electrode 14 is four thin rod-shaped metal electrodes, and the first protrusion 16 is provided at the tip porti...

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PUM

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Abstract

According to the present invention, in an ignition plug (1), due to a ground electrode (14) being set to have a thin rod or net shape, a sufficiently strong radical is generated locally via a barrierdischarge and the quenching effect by the electrode is small and flame growth is not readily prevented. Further, by making a thickness dimension of a second dielectric body (12b) facing a discharge region (15) uniform, the barrier discharge expands on a surface of the second dielectric body (12b), radical generation is maintained and combustibility after ignition is promoted. Further, an end part(11c) of a high voltage electrode (11) and the ground electrode (14) are arranged facing one another in a combustion chamber (22), so a fuel gas introduced to the combustion chamber (22) readily flowsto the discharge region (15) and is readily ignited by the radical generated via discharge.

Description

Technical field [0001] The present invention relates to a spark plug using dielectric barrier discharge and an ignition system provided with the spark plug. Background technique [0002] Regarding gasoline engines, reducing CO 2 In the context of a sharp increase in gasoline prices or other backgrounds, there is a high demand for fuel consumption reduction. Although lean combustion or exhaust gas recirculation techniques have been used to improve fuel consumption, there are problems such as poor ignition. The spark plugs used in current gasoline engines apply high voltage pulses between electrodes, so that thermal plasma is generated by arc discharge, and the thermal plasma is used to ignite the fuel. [0003] On the contrary, as a technique for improving the stability of ignition, it has been proposed to practically use a low-temperature plasma with a certain volume and an efficient ignition method. Low-temperature plasma is a plasma in a non-equilibrium state in which the temper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/50F02B23/08F02P3/01F02P13/00H01T13/20
CPCF02P3/01H01T13/50H01T13/34H01T13/467H01T13/52H01T13/54H01T19/04H05H1/2406F02P15/10H05H1/2418F02P23/04F02B23/08F02P13/00F02P5/145H01T13/32
Inventor 民田太一郎井上贵裕桥本隆中川光坂下友一永井孝佳棚谷公彦龟田裕之山田裕一伴谦治
Owner MITSUBISHI ELECTRIC CORP
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