WO2014178449A1 - Ignition plug with oxygen sensor - Google Patents

Ignition plug with oxygen sensor Download PDF

Info

Publication number
WO2014178449A1
WO2014178449A1 PCT/KR2013/003720 KR2013003720W WO2014178449A1 WO 2014178449 A1 WO2014178449 A1 WO 2014178449A1 KR 2013003720 W KR2013003720 W KR 2013003720W WO 2014178449 A1 WO2014178449 A1 WO 2014178449A1
Authority
WO
WIPO (PCT)
Prior art keywords
oxygen sensor
spark plug
center electrode
insulator
oxygen
Prior art date
Application number
PCT/KR2013/003720
Other languages
French (fr)
Korean (ko)
Inventor
오진우
최규철
안용흠
Original Assignee
쌍용자동차 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 쌍용자동차 주식회사 filed Critical 쌍용자동차 주식회사
Priority to PCT/KR2013/003720 priority Critical patent/WO2014178449A1/en
Publication of WO2014178449A1 publication Critical patent/WO2014178449A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices

Definitions

  • the present invention relates to a spark plug, and more particularly to a spark plug having an oxygen sensor installed in the spark plug to measure the oxygen content in the mixer of the internal combustion engine to grasp the combustion state of the internal combustion engine. .
  • an internal combustion engine is provided with a spark plug for igniting a fuel-air mixture of fuel and air during an intake stroke.
  • the spark plug causes a spark discharge in the combustion chamber to ignite the mixer.
  • a spark plug with a pressure sensor is used.
  • the electrode part is used to further increase the ignition energy by using iridium (Ir) in the existing platinum (Pt).
  • an oxygen sensor is mounted on a rear end of a engine and a three way catalysist to determine an engine combustion state.
  • the combustion condition changes with the air-fuel ratio of the mixer around the spark plug.
  • the air-fuel ratio of the mixer around the spark plug in the combustion chamber cannot be grasped, and thus stable combustion cannot be realized in an ultra-lean state.
  • the present invention has been made in order to solve the above problems of the prior art, by installing an oxygen sensor inside the spark plug to measure the oxygen content in the mixer of the internal combustion engine to determine the combustion state of the internal combustion engine ignition
  • the purpose is to provide a plug.
  • a spark plug having an oxygen sensor includes a center electrode, an insulator in which the center electrode is disposed, a housing surrounding at least a portion of the insulator, the housing and the insulator And an oxygen sensor disposed therebetween to measure the oxygen content of the mixer in the combustion chamber, and a ground electrode disposed to face one end of the housing with a predetermined gap therebetween.
  • the spark plug according to the invention is characterized in that it further comprises a control device for controlling the air-fuel ratio by adjusting the amount of fuel in accordance with the oxygen content of the mixer measured by the oxygen sensor.
  • the housing is characterized in that it comprises an oxygen sensor protector is formed extending further than the lower end of the oxygen sensor.
  • the lower end of the oxygen sensor protector is characterized in that it is formed to be bent inward to prevent sparks from splashing into the inside of the oxygen sensor during the operation of the spark plug.
  • the oxygen sensor protection unit may include a plurality of oxygen sensing holes formed at predetermined intervals along an outer circumferential surface of the oxygen sensor protecting unit to expose the oxygen sensor to the mixer in the combustion chamber.
  • the lower end of the center electrode and the insulator is characterized in that it is formed to have a tapered shape in the direction of the ground electrode.
  • the thermal expansion absorbing portion is provided in a predetermined section of the lower end of the oxygen sensor and the center electrode.
  • the present invention can determine the combustion state of the internal combustion engine by installing an oxygen sensor inside the spark plug to measure the oxygen content in the mixer of the internal combustion engine.
  • the present invention measures the oxygen content of the mixer by using an oxygen sensor to determine the air-fuel ratio of the mixer, and can be used as feedback on the ignition timing and the ignition energy based on the determined air-fuel ratio. Therefore, the present invention can realize stable combustion even in an ultrathin state.
  • FIG. 1 is a perspective view showing a spark plug having an oxygen sensor according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of the spark plug shown in FIG. 1.
  • FIG. 2 is a cross-sectional view of the spark plug shown in FIG. 1.
  • FIG 3 is a perspective view and a cross-sectional view showing a spark plug according to another embodiment of the present invention.
  • the spark plug of the present invention is intended to be applied to an ultra-thin direct injection engine, which is located together with a fuel injection nozzle (Fuel-Injector) in the upper center of the cylinder head and the lower stroke of the piston during the intake stroke and the fuel injected through the fuel injection device.
  • a fuel injection nozzle Fluel-Injector
  • By measuring the air-fuel ratio of the mixer made by mixing the air sucked by the movement can be used as a feedback on the ignition timing and ignition energy. Therefore, by grasping the air-fuel ratio of the mixer around the spark plug, it is possible to implement stable combustion even in an ultra-lean state.
  • FIG. 1 is a perspective view illustrating a spark plug having an oxygen sensor according to the present invention
  • FIG. 2 is a cross-sectional view of the spark plug shown in FIG. 1
  • FIG. 3 is a spark plug according to another embodiment of the present invention. The perspective view and sectional drawing shown are shown.
  • the spark plug 100 having an oxygen sensor according to the present invention includes a center electrode 110, an insulator 120, a housing 130, an oxygen sensor 140, a ground electrode 150, And terminal 160.
  • the center electrode 110 is formed in a pillar shape and is installed perpendicular to the center of the spark plug 100 to serve as a central axis.
  • the center electrode 110 is made of a material having conductivity such as a nickel alloy.
  • a spark is generated between the ground electrode 150 and the point where the ignition is performed.
  • the insulator 120 is cylindrical and the center electrode 110 penetrates inside.
  • the insulator 120 is made of an insulator such as ceramic.
  • the insulator 120 serves to prevent the high voltage from leaking to the outside when a high voltage is supplied to the center electrode 110.
  • the lower ends of the center electrode 110 and the insulator 120 are formed to have a tapered shape in the direction of the ground electrode 150. This is to increase the spark discharge between the center electrode 100 and the ground electrode 150 to be described later under the high pressure generated in the ignition coil.
  • the housing 130 is formed in a cylindrical shape and is disposed to surround at least a portion of the insulator 120.
  • the insulator 120 is fixedly installed inside the housing 130.
  • One end of the housing 130 is mounted in a hole that opens the combustion chamber (cylinder) of the internal combustion engine.
  • the housing 130 is formed with a fixing part 131 inserted into a hole for opening the combustion chamber of the internal combustion engine to fix the spark plug 100 to the combustion chamber.
  • An upper step of the fixing part 131 is formed to stop the coupling of the fixing part 131 when the fixing part 131 is coupled to the hole of the combustion chamber.
  • the oxygen sensor protecting part 132 having a smaller diameter than the fixing part 131 is formed to extend below the fixing part 131.
  • the oxygen sensor protector 132 serves to protect the oxygen sensor 140 to be described later when the spark plug 100 is mounted to the engine.
  • the lower end of the oxygen sensor protection unit 132 is formed to be spaced apart from the lower end of the oxygen sensor 140 by a predetermined distance. In other words, the oxygen sensor protector 132 is formed to extend a predetermined length longer than the lower end of the oxygen sensor 140.
  • the lower end of the oxygen sensor protector 132 is formed to be bent inwardly to prevent sparks (flame) from splashing into the oxygen sensor 140 when the spark plug 100 operates.
  • a plurality of oxygen sensing holes 133 are formed at predetermined intervals along the outer circumferential surface.
  • the oxygen sensing hole 133 allows the oxygen sensor 140 to come into contact with the mixer to measure the accurate amount of oxygen.
  • the plurality of oxygen sensing holes 133 may be formed in an n ⁇ m array along the outer circumferential surface of the oxygen sensor protector 132 as shown in FIG. 3.
  • the oxygen sensor 140 is fixedly installed between the housing 130 and the insulator 120 to measure the oxygen content contained in the mixed gas (mixer) of air / fuel in the combustion chamber of the internal combustion engine. That is, the oxygen sensor 140 measures the air-fuel ratio (weight ratio of air and fuel) of the mixer.
  • the oxygen sensor 140 transmits the measured air-fuel ratio of the mixer to the controller (not shown) through the cable 141, and the controller (not shown) feeds the measured air-fuel ratio of the mixer to the ignition timing and the ignition energy. Use as. In other words, the controller (not shown) adjusts the fuel amount according to the amount of oxygen contained in the mixer measured through the oxygen sensor 140, thereby controlling the air-fuel ratio of the mixer.
  • the end of the cable 141 is provided with a connector for connecting with a control device (not shown).
  • the thermal expansion absorbing unit 170 is provided at a predetermined section of the lower end of the oxygen sensor 140 and the center electrode 110.
  • the thermal expansion absorbing unit 170 absorbs thermal expansion to prevent breakage of the oxygen sensor 140.
  • the ground electrode 150 has a predetermined gap with one end of the center electrode 110 at the lower end of the housing 130 and is installed to face the lower end of the housing 130.
  • the ground electrode 150 is generally formed in an L shape, but is not limited thereto and may be formed in various shapes.
  • the ground electrode 150 is made of a conductor such as a nickel alloy like the center electrode 110, and must withstand high temperature and have excellent durability.
  • the terminal 160 is installed at the other end of the center electrode 110 to supply electricity to the center electrode 110.
  • the present invention discloses determining the air-fuel ratio of the mixer around the spark plug by using an oxygen sensor, but is not limited thereto.
  • the pressure sensor may be further applied to realize the state of the internal combustion engine more accurately.

Abstract

The present invention relates to an ignition plug with an oxygen sensor. The ignition plug according to the present invention comprises: a center electrode (110); an insulator (120) having the center electrode located inside thereof; a housing (130) surrounding at least part of the insulator (120); an oxygen sensor (140), installed between the housing (130) and the insulator (120), for measuring oxygen content in a mixer within a combustion chamber; and a ground electrode (150) installed at one end of the housing (130) to face the center electrode with a predetermined gap therebetween.

Description

산소 센서를 구비한 점화 플러그Spark plug with oxygen sensor
본 발명은 점화 플러그에 관한 것으로, 더욱 상세하게는 점화 플러그 내측에 산소 센서를 설치하여 내연기관의 혼합기 내 산소 함유량을 측정하여 내연기관의 연소상태를 파악하는 산소 센서를 구비한 점화 플러그에 관한 것이다.The present invention relates to a spark plug, and more particularly to a spark plug having an oxygen sensor installed in the spark plug to measure the oxygen content in the mixer of the internal combustion engine to grasp the combustion state of the internal combustion engine. .
일반적으로, 내연기관에는 흡기 행정시 연료와 공기가 혼합된 혼합기(fuel-air mixture)를 점화시키기 위한 점화 플러그(spark plug)가 설치된다. 점화 플러그는 연소실 내에서 불꽃방전을 일으켜 혼합기를 발화시키는 역할을 한다.In general, an internal combustion engine is provided with a spark plug for igniting a fuel-air mixture of fuel and air during an intake stroke. The spark plug causes a spark discharge in the combustion chamber to ignite the mixer.
이러한 연소실 내 연소 상태를 파악하기 위하여 압력센서가 적용된 점화 플러그가 사용되고 있다. 또한, 점화 플러그의 연소 안정성을 높이기 위해 전극 부분을 기존 백금(Pt)에서 이리듐(Ir)을 사용하여 점화 에너지를 더욱 높이는데 활용하고 있다.In order to grasp the combustion state in the combustion chamber, a spark plug with a pressure sensor is used. In addition, in order to increase the combustion stability of the spark plug, the electrode part is used to further increase the ignition energy by using iridium (Ir) in the existing platinum (Pt).
더불어, 종래에는 엔진의 후단 및 삼원촉매장치(Three Way Catalysist)에 산소 센서를 장착하여 엔진 연소 상태를 파악하는데 사용되고 있다.In addition, in the related art, an oxygen sensor is mounted on a rear end of a engine and a three way catalysist to determine an engine combustion state.
초희박 직접분사식 엔진에서 점화 플러그 주변 혼합기의 공연비에 따라 연소 상태가 변하게 된다. 그러나, 종래에는 연소실 내 점화 플러그 주변 혼합기의 공연비를 파악할 수 없어 초희박 상태에서 안정된 연소를 구현할 수 없다.In ultra-lean direct injection engines, the combustion condition changes with the air-fuel ratio of the mixer around the spark plug. However, in the related art, the air-fuel ratio of the mixer around the spark plug in the combustion chamber cannot be grasped, and thus stable combustion cannot be realized in an ultra-lean state.
본 발명은 상기한 종래기술의 문제점을 해결하기 위하여 안출된 것으로, 점화 플러그 내측에 산소 센서를 설치하여 내연기관의 혼합기 내 산소 함유량을 측정하여 내연기관의 연소상태를 파악하는 산소 센서를 구비한 점화 플러그를 제공하는데 목적이 있다.The present invention has been made in order to solve the above problems of the prior art, by installing an oxygen sensor inside the spark plug to measure the oxygen content in the mixer of the internal combustion engine to determine the combustion state of the internal combustion engine ignition The purpose is to provide a plug.
상기한 과제를 달성하기 위하여, 본 발명에 따른 산소 센서를 구비한 점화 플러그는 중심전극과, 내부에 상기 중심전극이 배치되는 절연체와, 상기 절연체의 적어도 일부분을 둘러싸는 하우징과, 상기 하우징과 절연체 사이에 설치되어 연소실 내 혼합기의 산소 함유량을 측정하는 산소 센서와, 상기 하우징의 일단부에 상기 중심전극과 소정 간극을 갖으며 대향하게 설치되는 접지전극을 포함한다.In order to achieve the above object, a spark plug having an oxygen sensor according to the present invention includes a center electrode, an insulator in which the center electrode is disposed, a housing surrounding at least a portion of the insulator, the housing and the insulator And an oxygen sensor disposed therebetween to measure the oxygen content of the mixer in the combustion chamber, and a ground electrode disposed to face one end of the housing with a predetermined gap therebetween.
또한, 본 발명에 따른 점화 플러그는 상기 산소 센서에 의해 측정된 혼합기의 산소 함유량에 따라 연료량을 조절하여 공연비를 제어하는 제어장치를 더 포함하는 것을 특징으로 한다.In addition, the spark plug according to the invention is characterized in that it further comprises a control device for controlling the air-fuel ratio by adjusting the amount of fuel in accordance with the oxygen content of the mixer measured by the oxygen sensor.
또한, 상기 하우징은 산소 센서의 하단부 보다 더 연장되어 형성되는 산소 센서 보호부를 포함하는 것을 특징으로 한다.In addition, the housing is characterized in that it comprises an oxygen sensor protector is formed extending further than the lower end of the oxygen sensor.
또한, 상기 산소 센서 보호부의 하단부는 점화 플러그 동작 시 산소 센서의 내부로 스파크가 튀는 것을 방지하기 위해 내측방향으로 절곡되게 형성되는 것을 특징으로 한다.In addition, the lower end of the oxygen sensor protector is characterized in that it is formed to be bent inward to prevent sparks from splashing into the inside of the oxygen sensor during the operation of the spark plug.
또한, 상기 산소 센서 보호부는, 산소 센서가 연소실 내 혼합기에 노출되도록 외주면을 따라 소정 간격으로 형성되는 다수 개의 산소 센싱홀을 포함하는 것을 특징으로 하는 한다.The oxygen sensor protection unit may include a plurality of oxygen sensing holes formed at predetermined intervals along an outer circumferential surface of the oxygen sensor protecting unit to expose the oxygen sensor to the mixer in the combustion chamber.
또한, 상기 중심전극과 절연체의 하단부는 접지전극 방향으로 테이퍼 형상을 갖도록 형성되는 것을 특징으로 한다.In addition, the lower end of the center electrode and the insulator is characterized in that it is formed to have a tapered shape in the direction of the ground electrode.
또한, 상기 산소 센서과 중심전극의 하단부의 일정구간에 열팽창 흡수부가 마련되는 것을 특징으로 한다.In addition, the thermal expansion absorbing portion is provided in a predetermined section of the lower end of the oxygen sensor and the center electrode.
본 발명은 점화 플러그 내측에 산소 센서를 설치하여 내연기관의 혼합기 내 산소 함유량을 측정하여 내연기관의 연소상태를 확인할 수 있다.The present invention can determine the combustion state of the internal combustion engine by installing an oxygen sensor inside the spark plug to measure the oxygen content in the mixer of the internal combustion engine.
또한, 본 발명은 산소 센서를 이용하여 혼합기의 산소 함유량을 측정하므로 혼합기의 공연비를 파악할 수 있으며, 그 파악된 혼합기의 공연비에 근거하여 점화 시기 및 점화 에너지에 대한 피드백으로 사용할 수 있다. 따라서, 본 발명은 초희박 상태에서도 안정된 연소를 구현할 수 있다.In addition, the present invention measures the oxygen content of the mixer by using an oxygen sensor to determine the air-fuel ratio of the mixer, and can be used as feedback on the ignition timing and the ignition energy based on the determined air-fuel ratio. Therefore, the present invention can realize stable combustion even in an ultrathin state.
도 1은 본 발명의 일 실시 예에 따른 산소 센서를 구비한 점화 플러그를 도시한 사시도.1 is a perspective view showing a spark plug having an oxygen sensor according to an embodiment of the present invention.
도 2는 도 1에 도시된 점화 플러그의 단면도.FIG. 2 is a cross-sectional view of the spark plug shown in FIG. 1. FIG.
도 3은 본 발명의 다른 실시 예에 따른 점화 플러그를 도시한 사시도 및 단면도.3 is a perspective view and a cross-sectional view showing a spark plug according to another embodiment of the present invention.
이하, 첨부된 도면들을 참조하여 본 발명의 실시 예를 구체적으로 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
본 발명의 점화 플러그는 초희박 직접분사식 엔진에 적용하기 위한 것으로, 실린더 헤드 중앙 상부에 연료 분사 노즐(Fuel-Injector)와 함께 위치하며 연료분사장치를 통해 분사되는 연료와 흡입 행정 시 피스톤의 하행정운동으로 흡입되는 공기가 혼합되어 만들어진 혼합기의 공연비를 측정하여 점화시기 및 점화 에너지에 대한 피드백으로 사용할 수 있다. 따라서, 점화 플러그 주변 혼합기의 공연비를 파악함으로써 초희박 상태에서도 안정된 연소를 구현할 수 있다.The spark plug of the present invention is intended to be applied to an ultra-thin direct injection engine, which is located together with a fuel injection nozzle (Fuel-Injector) in the upper center of the cylinder head and the lower stroke of the piston during the intake stroke and the fuel injected through the fuel injection device. By measuring the air-fuel ratio of the mixer made by mixing the air sucked by the movement can be used as a feedback on the ignition timing and ignition energy. Therefore, by grasping the air-fuel ratio of the mixer around the spark plug, it is possible to implement stable combustion even in an ultra-lean state.
도 1은 본 발명에 따른 산소 센서를 구비한 점화 플러그를 도시한 사시도이고, 도 2는 도 1에 도시된 점화 플러그의 단면도를 도시하며, 도 3은 본 발명의 다른 실시 예에 따른 점화 플러그를 도시한 사시도 및 단면도를 도시한다.1 is a perspective view illustrating a spark plug having an oxygen sensor according to the present invention, FIG. 2 is a cross-sectional view of the spark plug shown in FIG. 1, and FIG. 3 is a spark plug according to another embodiment of the present invention. The perspective view and sectional drawing shown are shown.
도면에 도시된 바와 같이, 본 발명에 따른 산소 센서를 구비한 점화 플러그(100)는 중심전극(110), 절연체(120), 하우징(130), 산소 센서(140), 접지전극(150), 터미널(160)를 포함한다.As shown in the figure, the spark plug 100 having an oxygen sensor according to the present invention includes a center electrode 110, an insulator 120, a housing 130, an oxygen sensor 140, a ground electrode 150, And terminal 160.
중심전극(110)은 기둥 형상으로 형성되며 점화 플러그(100)의 중심에 수직하게 설치되어 중심축 역할을 한다. 중심 전극(110)은 니켈 합금과 같은 도전성을 갖는 재료로 제조된다. 또한, 중심 전극(110)은 고전압이 인가되면 접지전극(150)과의 사이에 스파크가 발생하며 점화가 이루어지는 지점으로 고온에 견뎌야 하며 내구성이 우수해야 한다.The center electrode 110 is formed in a pillar shape and is installed perpendicular to the center of the spark plug 100 to serve as a central axis. The center electrode 110 is made of a material having conductivity such as a nickel alloy. In addition, when the high voltage is applied to the center electrode 110, a spark is generated between the ground electrode 150 and the point where the ignition is performed.
절연체(insulator)(120)는 원통형이며 중심전극(110)이 내부를 관통한다. 상기 절연체(120)는 세라믹과 같은 부도체로 제조된다. 절연체(120)는 중심전극(110)으로 고전압이 공급될 때 그 고전압이 외부로 누출되는 것을 막아주는 역할을 한다.The insulator 120 is cylindrical and the center electrode 110 penetrates inside. The insulator 120 is made of an insulator such as ceramic. The insulator 120 serves to prevent the high voltage from leaking to the outside when a high voltage is supplied to the center electrode 110.
상기한 중심전극(110)과 절연체(120)의 하단부는 접지전극(150)의 방향으로 테이퍼 형상을 갖도록 형성된다. 이는 점화 코일에서 발생한 고압을 받아 중심전극(100)과 후술하는 접지전극(150) 사이에 불꽃 방전을 높이기 위한 것이다.The lower ends of the center electrode 110 and the insulator 120 are formed to have a tapered shape in the direction of the ground electrode 150. This is to increase the spark discharge between the center electrode 100 and the ground electrode 150 to be described later under the high pressure generated in the ignition coil.
하우징(130)은 원통형 형태로 형성되며 절연체(120)의 적어도 일부분을 둘러싸게 배치된다. 하우징(130)의 내측에 절연체(120)가 고정되게 설치된다. 하우징(130)의 일단부는 내연기관의 연소실(실린더)을 개방하는 홀에 장착된다.The housing 130 is formed in a cylindrical shape and is disposed to surround at least a portion of the insulator 120. The insulator 120 is fixedly installed inside the housing 130. One end of the housing 130 is mounted in a hole that opens the combustion chamber (cylinder) of the internal combustion engine.
하우징(130)에는 내연기관의 연소실을 개방하는 홀에 삽입되어 점화 플러그(100)를 연소실에 고정시키는 고정부(131)가 형성된다. 고정부(131)의 상부에는 고정부(131)가 연소실의 홀에 결합될 때 고정부(131)의 결합을 정지시키는 단턱이 형성되어 있다.The housing 130 is formed with a fixing part 131 inserted into a hole for opening the combustion chamber of the internal combustion engine to fix the spark plug 100 to the combustion chamber. An upper step of the fixing part 131 is formed to stop the coupling of the fixing part 131 when the fixing part 131 is coupled to the hole of the combustion chamber.
상기 고정부(131)의 하방으로 고정부(131)보다 작은 직경을 가지는 산소 센서 보호부(132)가 연장되게 형성된다. 산소 센서 보호부(132)는 점화 플러그(100)를 엔진에 장착할 때 후술하는 산소 센서(140)를 보호하는 역할을 한다. 또한, 산소 센서 보호부(132)의 하단부는 산소 센서(140)의 하단부로부터 소정 거리 이격되게 형성된다. 다시 말해서, 산소 센서 보호부(132)는 산소 센서(140)의 하단부 보다 소정 길이 더 연장되어 형성된다.The oxygen sensor protecting part 132 having a smaller diameter than the fixing part 131 is formed to extend below the fixing part 131. The oxygen sensor protector 132 serves to protect the oxygen sensor 140 to be described later when the spark plug 100 is mounted to the engine. In addition, the lower end of the oxygen sensor protection unit 132 is formed to be spaced apart from the lower end of the oxygen sensor 140 by a predetermined distance. In other words, the oxygen sensor protector 132 is formed to extend a predetermined length longer than the lower end of the oxygen sensor 140.
산소 센서 보호부(132)의 하단부는 점화 플러그(100)가 동작할 때 산소 센서(140)의 내부로 스파크(불꽃)가 튀는 것을 방지할 수 있게 내측 방향으로 절곡되게 형성된다.The lower end of the oxygen sensor protector 132 is formed to be bent inwardly to prevent sparks (flame) from splashing into the oxygen sensor 140 when the spark plug 100 operates.
산소 센서 보호부(132)의 하단에는 외주면을 따라 소정 간격으로 다수 개의 산소 센싱홀(133)이 형성된다. 산소 센싱홀(133)은 산소 센서(140)가 혼합기와 접촉하도록 하여 정확한 산소량을 측정할 수 있게 한다. 다수 개의 산소 센싱홀(133)은 도 3에 도시된 바와 같이 산소 센서 보호부(132)의 외주면을 따라 n×m 형태의 배열로 형성될 수도 있다.At the lower end of the oxygen sensor protection unit 132, a plurality of oxygen sensing holes 133 are formed at predetermined intervals along the outer circumferential surface. The oxygen sensing hole 133 allows the oxygen sensor 140 to come into contact with the mixer to measure the accurate amount of oxygen. The plurality of oxygen sensing holes 133 may be formed in an n × m array along the outer circumferential surface of the oxygen sensor protector 132 as shown in FIG. 3.
산소 센서(140)는 상기 하우징(130)과 절연체(120) 사이에 고정 설치되어 내연기관의 연소실 내 공기/연료의 혼합가스(혼합기)에 포함된 산소 함유량을 측정한다. 즉, 산소 센서(140)는 혼합기의 공연비(공기와 연료의 중량비)를 측정하는 것이다. 산소 센서(140)는 측정된 혼합기의 공연비를 케이블(141)을 통해 제어장치(미도시)로 전송하고, 제어장치(미도시)는 그 측정된 혼합기의 공연비를 점화 시기 및 점화 에너지에 대한 피드백으로 이용한다. 다시 말해서, 제어장치(미도시)는 산소 센서(140)를 통해 측정한 혼합기에 함유된 산소량에 따라 연료량을 조절하므로 혼합기의 공연비를 제어할 수 있다. 여기서, 도면에는 도시되지 않았지만 케이블(141)의 끝단에는 제어장치(미도시)와 연결하기 위한 커넥터이 구비된다.The oxygen sensor 140 is fixedly installed between the housing 130 and the insulator 120 to measure the oxygen content contained in the mixed gas (mixer) of air / fuel in the combustion chamber of the internal combustion engine. That is, the oxygen sensor 140 measures the air-fuel ratio (weight ratio of air and fuel) of the mixer. The oxygen sensor 140 transmits the measured air-fuel ratio of the mixer to the controller (not shown) through the cable 141, and the controller (not shown) feeds the measured air-fuel ratio of the mixer to the ignition timing and the ignition energy. Use as. In other words, the controller (not shown) adjusts the fuel amount according to the amount of oxygen contained in the mixer measured through the oxygen sensor 140, thereby controlling the air-fuel ratio of the mixer. Here, although not shown in the drawing, the end of the cable 141 is provided with a connector for connecting with a control device (not shown).
상기한 산소 센서(140)와 중심전극(110)의 하단부 일정 구간에 열팽창 흡수부(170)가 구비된다. 열팽창 흡수부(170)는 열팽창을 흡수하여 산소 센서(140)의 파손을 방지하는 역할을 한다.The thermal expansion absorbing unit 170 is provided at a predetermined section of the lower end of the oxygen sensor 140 and the center electrode 110. The thermal expansion absorbing unit 170 absorbs thermal expansion to prevent breakage of the oxygen sensor 140.
접지전극(150)은 하우징(130)의 하단부에 중심전극(110)의 일단부와 소정 간극을 갖으며 대향하게 설치된다. 접지전극(150)은 L자형으로 형성되는 것이 일반적이나, 이에 한정되지 않고 다양한 형상으로 형성될 수 있다. 이러한 접지전극(150)은 중심전극(110)과 같이 니켈 합금과 같은 도전체로 제조되며, 고온에 견뎌야하며 내구성이 우수해야 한다.The ground electrode 150 has a predetermined gap with one end of the center electrode 110 at the lower end of the housing 130 and is installed to face the lower end of the housing 130. The ground electrode 150 is generally formed in an L shape, but is not limited thereto and may be formed in various shapes. The ground electrode 150 is made of a conductor such as a nickel alloy like the center electrode 110, and must withstand high temperature and have excellent durability.
터미널(160)은 중심전극(110)의 타단부에 설치되어 중심전극(110)에 전기를 공급한다.The terminal 160 is installed at the other end of the center electrode 110 to supply electricity to the center electrode 110.
본 발명은 산소 센서를 이용하여 점화 플러그 주변 혼합기의 공연비를 파악하는 것을 개시하고 있으나, 이에 한정되지 않고 압력 센서를 추가로 적용하여 내연기관의 상태를 좀더 정확하게 파악할 수 있도록 구현할 수도 있다.The present invention discloses determining the air-fuel ratio of the mixer around the spark plug by using an oxygen sensor, but is not limited thereto. The pressure sensor may be further applied to realize the state of the internal combustion engine more accurately.

Claims (7)

  1. 중심전극(110)과,The center electrode 110,
    내부에 상기 중심전극(110)이 배치되는 절연체(120)와,An insulator 120 having the center electrode 110 disposed therein;
    상기 절연체(120)의 적어도 일부분을 둘러싸는 하우징(130)과,A housing 130 surrounding at least a portion of the insulator 120;
    상기 하우징(130)과 절연체(120) 사이에 설치되어 연소실 내 혼합기의 산소 함유량을 측정하는 산소 센서(140)와,An oxygen sensor 140 installed between the housing 130 and the insulator 120 to measure oxygen content of the mixer in the combustion chamber;
    상기 하우징(130)의 일단부에 상기 중심전극(110)과 소정 간극을 갖으며 대향하게 설치되는 접지전극(150)을 포함하는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark plug having an oxygen sensor, characterized in that it comprises a ground electrode 150 having a predetermined gap with the center electrode 110 at one end of the housing (130).
  2. 제1항에 있어서,The method of claim 1,
    상기 산소 센서(140)에 의해 측정된 혼합기의 산소 함유량에 따라 연료량을 조절하여 공연비를 제어하는 제어장치를 더 포함하는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark control device having an oxygen sensor further comprises a control device for controlling the air-fuel ratio by adjusting the amount of fuel in accordance with the oxygen content of the mixer measured by the oxygen sensor (140).
  3. 제1항에 있어서,The method of claim 1,
    상기 하우징(130)은,The housing 130,
    산소 센서(140)의 하단부 보다 더 연장되어 형성되는 산소 센서 보호부(132)를 포함하는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark plug having an oxygen sensor, characterized in that it comprises an oxygen sensor protection unit 132 is formed to extend further than the lower end of the oxygen sensor (140).
  4. 제3항에 있어서,The method of claim 3,
    상기 산소 센서 보호부(132)의 하단부는 점화 플러그 동작 시 산소 센서(140)의 내부로 스파크가 튀는 것을 방지하기 위해 내측방향으로 절곡되게 형성되는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.The lower end of the oxygen sensor protection unit 132 is a spark plug having an oxygen sensor, characterized in that it is formed to be bent inward to prevent sparks from splashing into the interior of the oxygen sensor 140 during the spark plug operation.
  5. 제3항에 있어서,The method of claim 3,
    상기 산소 센서 보호부(132)는,The oxygen sensor protector 132,
    산소 센서(140)가 연소실 내 혼합기에 노출되도록 외주면을 따라 소정 간격으로 형성되는 다수 개의 산소 센싱홀(133)을 포함하는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark plug having an oxygen sensor characterized in that it comprises a plurality of oxygen sensing holes 133 are formed at predetermined intervals along the outer peripheral surface so that the oxygen sensor 140 is exposed to the mixer in the combustion chamber.
  6. 제1항에 있어서,The method of claim 1,
    상기 중심전극(110)과 절연체(120)의 하단부는 접지전극(150) 방향으로 테이퍼 형상을 갖도록 형성되는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark plug having an oxygen sensor, characterized in that the lower end of the center electrode 110 and the insulator 120 is formed to have a tapered shape in the direction of the ground electrode (150).
  7. 제1항에 있어서,The method of claim 1,
    상기 산소 센서(140)과 중심전극(110)의 하단부의 일정구간에 열팽창 흡수부가 마련되는 것을 특징으로 하는 산소 센서를 구비한 점화 플러그.Spark plug having an oxygen sensor, characterized in that the thermal expansion absorbing portion is provided in a predetermined section of the lower end of the oxygen sensor 140 and the center electrode (110).
PCT/KR2013/003720 2013-04-30 2013-04-30 Ignition plug with oxygen sensor WO2014178449A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/003720 WO2014178449A1 (en) 2013-04-30 2013-04-30 Ignition plug with oxygen sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/003720 WO2014178449A1 (en) 2013-04-30 2013-04-30 Ignition plug with oxygen sensor

Publications (1)

Publication Number Publication Date
WO2014178449A1 true WO2014178449A1 (en) 2014-11-06

Family

ID=51843570

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/003720 WO2014178449A1 (en) 2013-04-30 2013-04-30 Ignition plug with oxygen sensor

Country Status (1)

Country Link
WO (1) WO2014178449A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0817551A (en) * 1994-07-01 1996-01-19 Nippon Soken Inc Ignition plug for internal combustion engine
JPH10289776A (en) * 1997-04-16 1998-10-27 Takashi Wakabayashi Ignition plug with sensor
KR20090034366A (en) * 2006-07-07 2009-04-07 콘티넨탈 오토모티브 프랑스 Spark plug incorporating a pressure sensor
JP4302224B2 (en) * 1999-02-22 2009-07-22 日本特殊陶業株式会社 Spark plug
KR20110119761A (en) * 2009-01-29 2011-11-02 페더럴-모굴 이그니션 컴퍼니 Spark plug with integral combustion sensor and engine component therewith

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0817551A (en) * 1994-07-01 1996-01-19 Nippon Soken Inc Ignition plug for internal combustion engine
JPH10289776A (en) * 1997-04-16 1998-10-27 Takashi Wakabayashi Ignition plug with sensor
JP4302224B2 (en) * 1999-02-22 2009-07-22 日本特殊陶業株式会社 Spark plug
KR20090034366A (en) * 2006-07-07 2009-04-07 콘티넨탈 오토모티브 프랑스 Spark plug incorporating a pressure sensor
KR20110119761A (en) * 2009-01-29 2011-11-02 페더럴-모굴 이그니션 컴퍼니 Spark plug with integral combustion sensor and engine component therewith

Similar Documents

Publication Publication Date Title
WO2011046364A2 (en) Spark plug of an internal combustion engine
US8890396B2 (en) Spark plug for a gas-operated internal combustion engine
US20190376441A1 (en) Pre-Chamber Spark Plug
US4715337A (en) Engine ignition system with an insulated and extendable extender
US20090140623A1 (en) Spark plug
EP3206269B1 (en) Multipoint spark plug and multipoint spark plug manufacturing method
US10833485B2 (en) Pre-chamber spark plug
US6094990A (en) Spark plug with concentric pressure sensor
US6054680A (en) Pencil type glow plug for diesel engines
EP3206270A1 (en) Multipoint spark plug and multipoint ignition engine
WO2014178449A1 (en) Ignition plug with oxygen sensor
US10777976B1 (en) Spark plug
GB2318831A (en) Spark plug, eg for a direct-injection i.c. engine with charge stratification
SE514740C2 (en) Arrangements and measuring devices for detecting ionization in the combustion chamber of a diesel engine, and calibration device for this
CN110691899A (en) Spark plug configuration for dedicated EGR engine
KR101428717B1 (en) Spark plug with oxygen sensor
KR20100072284A (en) Spark plug
JPH1068510A (en) Fuel injection gun
Daniels et al. The effects of electrode design on mixture ignitability
US11600970B1 (en) Spark-plug wire having heat shield with retention features
JP7183933B2 (en) Spark plug
CN211476003U (en) Fire tube ignition device
CN111200239B (en) High-temperature-resistant spark plug for rarefied gas
CN209386356U (en) A kind of ceramic protective sleeve
CN217720252U (en) Novel side needle iridium spark plug

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13883782

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13883782

Country of ref document: EP

Kind code of ref document: A1