spark plug

A technology for spark plugs and main parts, applied in the field of spark plugs, can solve problems such as inability to detect with good accuracy, and achieve the effects of suppressing spark consumption, suppressing pre-ignition, and ensuring detection sensitivity

Active Publication Date: 2020-06-23
NGK SPARK PLUG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the above-mentioned conventional technology, there is a problem that the pre-ignition caused by the flame nucleus generated inside the spark plug cannot be accurately detected.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] (Example 1) The experimenter took the spark plug ( figure 2 Reference) and a pressure sensor are installed on an engine with a turbocharger (displacement 1.6L). The axial front end of the detection electrode of the spark plug is located at the axial center of the small-diameter portion of the insulator, and the width W of the detection electrode in the direction perpendicular to the axis direction is 1 mm. The detection electrode is disposed on a small-diameter portion of the insulator facing the first end portion of the ground electrode.

[0102] The experimenter ignited the air-fuel mixture supplied to the engine with a spark plug to burn it. The experimenter passed the ignition device described in the first embodiment (refer to Figure 4 ) provides a potential difference between the detection electrode of the spark plug and the metal body, thereby detecting the ion current, and the generation / growth of the flame nucleus generated in the space between the insulator...

Embodiment 2

[0105] (Embodiment 2) In addition to making the width W of the detection electrode of the spark plug (refer to figure 2 ) except for various differences, the testers tested the spark plug LSPI in the same manner as in Example 1. The applied voltage (potential difference between the detection electrode and the main body) was set to +50V. Figure 14 It is a graph showing the relationship between the width of the detection electrode and the false detection rate. Depend on Figure 14 Apparently, by setting the detection electrode width to 0.5 mm or more, the misdetection rate of the spark plug LSPI can be made 10% or less. It is presumed that this is because the influence of noise or the like can be suppressed.

Embodiment 3

[0106] (Example 3) Except that the distance D1 in the axial direction from the front end of the insulator of the spark plug to the front end of the detection electrode (refer to figure 2 ) except for various differences, the testers tested the spark plug LSPI in the same manner as in Example 1. The applied voltage (potential difference between the detection electrode and the main body) was set to +50V. Figure 15 It is a graph showing the relationship between the distance D1 in the axial direction from the tip of the insulator to the tip of the detection electrode and the occurrence rate of internal flashover (discharge between the center electrode and the detection electrode). Depend on Figure 15 Obviously, by setting the distance D1 to be 6 mm or more, it is possible to detect the spark plug LSPI while preventing the occurrence of internal flashover. This is due to the enhancement of the detection sensitivity of the spark plug LSPI by suppressing the discharge between th...

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PUM

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Abstract

The present invention provides a spark plug capable of improving the detection accuracy of pre-ignition caused by a flame nucleus generated inside the spark plug. The terminal is arranged on the rear side of the threaded portion of the metal shell. The detection electrode is disposed on the front end side of the contact portion between the reduced diameter portion and the bracket portion, or the reduced diameter portion and the seal in the space sandwiched between the outer periphery of the insulator and the inner periphery of the metallic shell. The detection electrode and the terminal are connected by a conductor. The detection electrode and conductor are insulated from the center electrode, body fittings and ground electrode. Since the detection electrode is disposed in the space sandwiched between the outer periphery of the insulator and the inner periphery of the metallic shell, it is possible to detect a flame nucleus generated in this space in advance.

Description

technical field [0001] The present invention relates to a spark plug, in particular to a spark plug capable of improving the detection accuracy of pre-ignition. Background technique [0002] There are known techniques for detecting the ion current generated when the flame reaches between the center electrode and the ground electrode of the spark plug to determine the combustion state of the internal combustion engine (Patent Documents 1 and 2). Electrodes other than the ground electrode are arranged near the center electrode and A spark plug that detects ion current (Patent Documents 3 and 4). There is also known a technique for adjusting the ignition timing of the spark plug based on the discriminated combustion state of the internal combustion engine (Patent Document 5). According to these technologies, premature ignition (preignition) caused by an overheated spark plug as a heat source and preignition caused by self-ignition of carbon can be accurately detected. The com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/40F02P13/00H01T13/20H01T15/00
CPCH01T13/20H01T13/40H01T15/00F02P13/00H01T13/32F02P17/12G01N27/626
Inventor 加纳大森清辉岩冢知宏井上芳树中川敬太
Owner NGK SPARK PLUG CO LTD
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