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Internal combustion engine electric discharge structure

a technology of electric discharge and internal combustion engine, which is applied in the direction of machines/engines, spark plugs, sparking plugs, etc., can solve the problems of achieve the effects of improving the autoignition properties of air-fuel mixture, low efficiency of radical generation and limited amount of radicals

Inactive Publication Date: 2009-05-21
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]As mentioned above, it has been discovered that, in order to improve the autoignition properties of the air-fuel mixture, a sparkplug can be used to generate radicals in the cylinder. However, since spark ignition is a thermal plasma discharge, the efficiency of radical generation is low even if spark ignition is induced by a sparkplug as in the conventional apparatus previously described. Moreover, in this conventional apparatus the amount of radicals generated is limited. It is therefore believed that the effects of improving the autoignition properties are small.
[0008]The present invention was designed in view of such conventional problems. One object of the present invention is to provide an electric discharge structure which is used in an internal combustion engine and which can improve the autoignition properties of an air-fuel mixture beyond that of conventional practice, and to provide a method for controlling the operation of the internal combustion engine.

Problems solved by technology

However, since spark ignition is a thermal plasma discharge, the efficiency of radical generation is low even if spark ignition is induced by a sparkplug as in the conventional apparatus previously described.
Moreover, in this conventional apparatus the amount of radicals generated is limited.

Method used

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second embodiment

[0139]Referring now to FIG. 18, an internal combustion engine electric discharge structure in accordance with a second embodiment will now be explained. Basically, in this second embodiment, the internal combustion engine electric discharge structure of the first embodiment is replaced in FIG. 1 with a modified structure as discussed below. In view of the similarity between the first and second embodiments, the parts of the second embodiment that are identical to the parts of the first embodiment will be given the same reference numerals as the parts of the first embodiment. Moreover, the descriptions of the parts of the second embodiment that are identical to the parts of the first embodiment can be omitted for the sake of brevity.

[0140]FIG. 18 is a simplified schematic cross-sectional view showing the operational configuration of the engine having an electric discharge structure in accordance with a second embodiment. The engine 1 having a barrier discharge function of the first e...

third embodiment

[0145]Referring now to FIG. 21, an internal combustion engine electric discharge structure in accordance with a third embodiment will now be explained. Basically, in this third embodiment, the internal combustion engine electric discharge structure of the first embodiment is replaced in FIG. 1 with a modified structure as discussed below. In view of the similarity between the first and second embodiments, the parts of the third embodiment that are identical to the parts of the first embodiment will be given the same reference numerals as the parts of the first embodiment. Moreover, the descriptions of the parts of the third embodiment that are identical to the parts of the first embodiment can be omitted for the sake of brevity.

[0146]FIG. 21 is a simplified schematic cross-sectional view showing the third embodiment of an engine having a barrier discharge function. In the barrier discharge device 70 of the present embodiment, a dielectric layer (insulating layer) 73 is formed on the...

fourth embodiment

[0147]Referring now to FIGS. 22A and 22B, an internal combustion engine electric discharge structure in accordance with a fourth embodiment will now be explained. Basically, in this fourth embodiment, the internal combustion engine electric discharge structure of the first embodiment is replaced in FIG. 1 with a modified structure as discussed below. In view of the similarity between the first and fourth embodiments, the parts of the fourth embodiment that are identical to the parts of the first embodiment will be given the same reference numerals as the parts of the first embodiment. Moreover, the descriptions of the parts of the fourth embodiment that are identical to the parts of the first embodiment can be omitted for the sake of brevity.

[0148]FIGS. 22A and 22B contain simplified schematic cross-sectional views showing the fourth embodiment of the engine having a barrier discharge function. In the barrier discharge device 70 of the present embodiment, in contrast to the first em...

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Abstract

An internal combustion engine electric discharge structure is provided which comprises a first electrode and a dielectric material. The first electrode includes a first voltage receiving end and a second engine attachment end with a long thin conductive material that discharges non-equilibrium plasma. The dielectric material covers the first electrode.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Japanese Patent Application No. 2007-298294, filed on Nov. 16, 2007. The entire disclosure of Japanese Patent Application No. 2007-298294 is hereby incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to an internal combustion engine electric discharge structure. More specifically, the present invention relates to an electric discharge structure which discharges non-equilibrium plasma in order to increase a number of radicals and thereby improve autoignition properties of the internal combustion engine.[0004]2. Background Information[0005]An electric discharge device has been proposed for an internal combustion engine in which the air-fuel mixture is ignited in an assisted manner by a sparkplug. In this electric discharge device radicals are generated in a cylinder and the autoignition properties of the air-fuel mixture ...

Claims

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Application Information

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IPC IPC(8): F23Q7/22
CPCF02P9/007H01T13/50F02P23/04F02P3/01
Inventor SHIRAISHI, TAISUKETAKAHASHI, EIJIURUSHIHARA, TOMONORI
Owner NISSAN MOTOR CO LTD
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