WO2014024576A1 - 圧力センサ一体型グロープラグ - Google Patents
圧力センサ一体型グロープラグ Download PDFInfo
- Publication number
- WO2014024576A1 WO2014024576A1 PCT/JP2013/066942 JP2013066942W WO2014024576A1 WO 2014024576 A1 WO2014024576 A1 WO 2014024576A1 JP 2013066942 W JP2013066942 W JP 2013066942W WO 2014024576 A1 WO2014024576 A1 WO 2014024576A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- heater element
- pressure sensor
- glow plug
- heat
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
- F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
- F02P19/028—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs the glow plug being combined with or used as a sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
- F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means
Definitions
- the present invention relates to a pressure sensor-integrated glow plug in which a pressure sensor for detecting in-cylinder pressure is integrated with a sheath-type glow plug used as a starting aid for a diesel engine.
- a glow plug is provided in a cylinder.
- a pressure sensor integrated glow plug in which a pressure sensor for detecting in-cylinder pressure is integrated with a glow plug has been put into practical use.
- a pressure sensor-integrated glow plug includes a housing for insertion into a cylinder, a heater element that protrudes from the housing and held by the housing, and a pressure disposed between the heater element and the housing. And a sensor.
- the heater element is held in the housing by a flexible member such as a bellows or a diaphragm, and the cylinder element is displaced in the axial direction by the cylinder internal pressure. Can be detected.
- the flexibility of the flexible member must be maintained. That is, the heater element must be prevented from being mechanically restrained at a portion other than the flexible member.
- the glow plug is used by being exposed in the cylinder. When unburned fuel components generated in the cylinder are accumulated between the heater element and the housing, the heater element is restrained by the housing, and the pressure is increased. There is a possibility that the in-cylinder pressure cannot be transmitted to the sensor.
- the filled fluid sealant is located in the vicinity of the combustion chamber for a long time, the fluidity may be lost. Further, when an oxidation catalyst is applied to the surface of the heater element, it is difficult to ensure a sufficient surface area, so that the catalytic activity becomes insufficient, and the deposited carbon or SOF (soluble organic component) catalyst. There was a possibility that combustion could not be performed efficiently.
- an object of the present invention is to provide a pressure sensor-integrated glow plug that suppresses the deposition of carbon and SOF in the gap between the housing and the heater element and prevents the heater element from being restrained for a long period of time. To do.
- a pressure sensor-integrated glow plug that is used by being inserted into a cylinder of an internal combustion engine, the housing, a rod-like heater element that is held with its tip projecting from the housing, and a pressure sensor
- the heater element is held by the housing by a flexible member so that the position of the heater element can be displaced with respect to the housing, and the pressure sensor receives the pressure in the cylinder by the displacement of the heater element.
- a heat-resistant fiber member carrying an oxidation catalyst component is provided in a gap between the housing and the heater element on the tip side of the flexible member.
- the pressure sensor integrated glow plug of the present invention carbon and SOF are prevented from entering between the housing and the heater element, and carbon and SOF attached to the fiber member are supported on the fiber surface. It can be oxidized and decomposed by the catalyst component. At this time, since the catalyst is supported on the fiber member, a large surface area for supporting the catalyst can be secured, the catalytic activity can be increased, and carbon and SOF can be efficiently decomposed. Therefore, it is possible to prevent the heater element from being restrained by the housing over a long period of time.
- the heat-resistant fiber member is preferably a ceramic fiber having an oxidation catalyst component supported thereon.
- the heat-resistant fiber member is provided so as to protrude beyond the housing beyond the gap between the housing and the heater element.
- FIG. 1 is a cross-sectional view of a pressure sensor integrated glow plug (hereinafter simply referred to as “glow plug”) 1 according to an embodiment of the present invention.
- a glow plug 1 shown in FIG. 1 is configured as a sheath type glow plug, and is configured as a glow plug 1 used in a self-ignition internal combustion engine such as a diesel engine, for example.
- This glow plug 1 has a rod-shaped heater element 2, which is inserted into a pre-combustion chamber in the case of a pre-combustion type internal combustion engine, and in the case of a direct-injection type internal combustion engine. It is inserted into the combustion chamber of the internal combustion engine and fixed.
- the heater element 2 can be configured as a heater element 2 made of metal or ceramic. However, the heater element 2 may have another configuration.
- the glow plug 1 has a housing 3.
- the housing 3 is preferably made of a metal material.
- the housing 3 has a concentric through-hole, and the rear end side of the heater element 2 is partially disposed inside the housing 3 and is located at the opening 4 provided on the front end side of the housing 3. It can project from the inside of the combustion chamber of the internal combustion engine.
- the housing 3 has a male screw thread 5, which allows the glow plug 1 to be screwed into an insertion hole provided in the housing of the internal combustion engine. At this time, the glow plug 1 is airtightly fitted into the insertion hole provided in the internal combustion engine by the conical seal 6.
- the rod-shaped heater element 2 used in this embodiment has a heating element 7 and a support tube 8.
- the support tube 8 is in contact with the outer peripheral surface 9 of the heating element 7 and is coupled to the heating element 7.
- the outer surface 10 of the support tube 8 also forms the outer surface 10 of the heater element 2 at the same time.
- the concentric through holes provided in the glow plug 1 are divided into an inner chamber 16 and a seal chamber 17 by a steel diaphragm 15 as a flexible member.
- the steel diaphragm 15 is connected on the one hand to the housing 3 and on the other hand to the support tube 8 of the heater element 2 at the cylindrical annular part 18.
- the steel diaphragm 15 has a base 19 which can be moved relative to the housing 3 in the direction of the axis 20 of the housing 3 of the glow plug 1. It is formed with flexibility.
- a pressure sensor 21 is disposed in the inner chamber 16.
- the pressure sensor 21 can be configured as a piezoelectric sensor element, for example.
- the piezoelectric sensor element generates a charge when subjected to a mechanical load, and the charge can be detected in the contact regions 22 and 23 of the pressure sensor 21.
- the detected electric charges are led out from the housing 3 of the glow plug 1 by the electric wires 24 and 25.
- the pressure sensor 21 is supported by a sleeve 27 coupled to the housing 3 on the end portion 26 side of the glow plug 1 on the side far from the combustion chamber or the like.
- the pressure sensor 21 is coupled to the heater element 2 via a force transmission sleeve 28. In this case, the heater element 2 is supported by the force transmission sleeve 28 mainly at the portion of the support tube 8.
- a force acting on the heater element 2 is generated based on the internal pressure of the combustion chamber of the internal combustion engine.
- This force acts on the heater element 2 in the axial direction 29, ie in the direction along the axis 20.
- This force is transmitted to the pressure sensor 21 along the force transmission path indicated by the arrows 30, 31 and 32.
- the pressure sensor 21 derives a detection signal via the electric wirings 24 and 25 according to the transmitted force, and the pressure formed in the combustion chamber or the like is measured from the detection signal.
- when measuring the pressure based on the detection signal of the pressure sensor 21 for example, if the influence is exerted on the force transmitted to the pressure sensor 21 caused by the elastic force of the steel diaphragm 15, it is considered in advance. it can.
- the heat-resistant fiber member 35 is disposed in the seal chamber 17.
- the configuration of the seal chamber 17 and the characteristics and operation of the heat-resistant fiber member 35 will be described in detail with reference to FIG.
- FIG. 2 shows in detail the region II indicated by the two-dot chain line in FIG.
- the base 19 of the steel diaphragm 15 has an annular surface 40, which is connected to the housing 3. Furthermore, the base 19 of the steel diaphragm 15 has another annular surface 41 which is oriented in the opposite direction to the annular surface 40 and is connected to the conical seal 6 of the housing 3. Has been. Furthermore, the inner surface 42 of the cylindrical annular portion 18 of the steel diaphragm 15 is joined to the outer surface 10 of the support tube 8. In this case, the steel diaphragm 15 and the support tube 8 are joined within the range of the inner surface 42 by, for example, laser welding. Has been. Thereby, a reliable sealing property between the seal chamber 17 and the inner chamber 16 is ensured.
- the thickness of the region 43 near the force transmission sleeve 28 in the support tube 8 is adapted to the thickness of the force transmission sleeve 28.
- the region 43 of the support tube 8 is formed to have a larger thickness than the other regions.
- annular gap 44 is provided between the housing 3 and the outer surface 10 of the heater element 2.
- the annular gap 44 forms an opening 4 on the end side.
- the annular gap 44 allows movement of the heater element 2 in the direction along the axis 20.
- the heater element 2 is subjected to the action of the elastic force of the steel diaphragm 15.
- the elastic force generated by the steel diaphragm 15 and acting on the heater element 2 via the support tube 8 is measured in advance, and this elastic force should be taken into account when measuring the pressure generated inside the combustion chamber or the like. Can do.
- the seal chamber 17 is provided with a heat-resistant fiber member 35.
- the heat-resistant fiber member 35 is also filled in the annular gap 44.
- the heat-resistant fiber member 35 is made of a member in which a known catalyst component having a high oxidizing ability is supported on a fiber having high heat resistance such as ceramic fiber or quartz fiber.
- the heat-resistant fiber member 35 can be a material in which a catalyst material is directly supported on a heat-resistant fiber, or a material in which ceramic particles having a large area on which a catalyst material is supported is held on a heat-resistant fiber. can do.
- the heat-resistant fiber member 35 may be filled with an unmolded material in the seal chamber 17 or the annular gap 44, or may be molded in advance according to the shape of the seal chamber 17 or the annular gap 44. You may come to wear it.
- the high heat-resistant fiber is selected from known high heat-resistant inorganic materials such as crystalline fiber, amorphous fiber, mineral wool, and glass fiber, and may be preformed.
- a catalyst component can be comprised including 1 type, or 2 or more types of noble metals.
- a catalyst material made of a metal oxide having a noble metal as a constituent element can be used.
- this heat-resistant fiber member 35 By providing this heat-resistant fiber member 35, it is possible to physically prevent carbon and SOF which are unburned substances from entering between the housing 3 and the heater element 2. Further, the carbon or the like attached to the heat resistant fiber member 35 is oxidized and decomposed by the supported catalyst component to become a gaseous state, thereby preventing the solid component from being deposited.
- the heat-resistant fiber member 35 carries the catalyst component on the fiber, the surface area on which the catalyst is carried is increased, and the catalytic activity can be further increased.
- the fiber for supporting the catalyst component is a ceramic fiber or quartz fiber
- the heat retention effect increases the catalytic activity by utilizing the heat generated by the heater element 2, effectively reducing carbon and SOF. It can be oxidized and decomposed.
- the heat-resistant fiber member 35 uses fiber, the filling density is kept low, there is no possibility of restraining the heater element 2, and the pressure received by the heater element 2 can be efficiently detected by the pressure sensor 21. Can be communicated to.
- the heat-resistant sealing material 35 has a function of protecting the steel diaphragm 15, particularly reducing corrosion of the steel diaphragm 15.
- the heat-resistant fiber member 35 may be provided in a state of protruding from the gap between the housing 3 and the heater element 2.
- carbon, SOF, and the like that have entered the gap between the insertion hole provided in the housing of the internal combustion engine and the heater element 2 are oxidized and decomposed and deposited. Can be prevented.
- FIG. 3 shows an enlarged view of an example of a glow plug using a bellows instead of a steel diaphragm as a flexible member.
- a bellows 68 is coupled to the heater element 52, and the bellows 68 is fixed to the housing 53 at one end side thereof.
- the heater element 52 can move smoothly in the axial direction within the housing 53.
- the bellows 68 is preferably made of a metal material, and the bellows 68 and the heater element 52 are joined by a method such as laser welding, crimping, swaging, soldering, or press fitting.
- the housing 53 includes a cylindrical seal 56 at the tip, and an annular gap 64 is provided between the housing 53 and the heater element 52 in the region of the tip of the cylindrical seal 56. Is provided.
- the annular gap 64 forms an opening on the end side.
- a heat resistant fiber member 65 is provided on the front end side inside the cylindrical seal 56 including the annular gap.
- the bellows 68 is used as the flexible member for holding the heater element 52, the heat-resistant fiber member 65 in which the oxidation catalyst component is supported in the gap between the housing 53 and the heater element 52 on the front end side.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
このようにセラミックファイバーを用いて耐熱性ファイバー部材を構成することにより、セラミック材料が有する保温性により、触媒活性を向上させて、カーボンやSOFの酸化、分解をより効果的に行わせることができる。
このように耐熱性ファイバー部材を配置することにより、内燃機関の挿入孔とヒータエレメントとの間に侵入したカーボンやSOFを酸化、分解して、それらが堆積することを防ぐことができる。
なお、それぞれの図中において同じ符号が付されているものは、特に説明がない限り同一の構成要素を示しており、適宜説明が省略されている。
図1は、本発明の実施の形態にかかる圧力センサ一体型グロープラグ(以下、単に「グロープラグ」と称する。)1の断面図である。
図1に示すグロープラグ1は、シース型グロープラグとして構成されたものであって、例えば、ディーゼルエンジン等の自己着火型の内燃機関に用いられるグロープラグ1として構成されている。
さらに、耐熱性ファイバー部材35はファイバーを利用したものであるために、充填密度が低く抑えられ、ヒータエレメント2を拘束するおそれがなく、ヒータエレメント2が受けた圧力を、効率的に圧力センサ21に伝達することができる。さらには、耐熱性シール材35は、鋼ダイヤフラム15の保護、特に鋼ダイヤフラム15の腐食を低減するという機能をも有している。
図3は、可撓部材として、鋼ダイヤフラムの代わりにベローズを用いたグロープラグの例の拡大図を示している。
このグロープラグの例において、ヒータエレメント52にはベローズ68が結合され、ベローズ68は、その一端側においてハウジング53に固定されている。ヒータエレメント52は、ハウジング53内で軸方向にスムーズに移動可能となっている。このベローズ68は、好ましくは金属材料によって形成され、ベローズ68とヒータエレメント52との結合は、例えば、レーザ溶接やクリンピング、スエージング、はんだ付け、圧入等の方法によって行われる。
Claims (3)
- 内燃機関の気筒内に挿入されて用いられる圧力センサ一体型グロープラグであって、ハウジングと、前記ハウジングから先端を突出させて保持されたロッド状のヒータエレメントと、圧力センサと、を備え、前記ヒータエレメントが、可撓部材によって前記ハウジングに保持されて前記ハウジングに対する位置を変位可能にされており、前記圧力センサが前記ヒータエレメントの変位によって前記気筒内の圧力を受けられるようにされた圧力センサ一体型グロープラグにおいて、
前記可撓部材よりも先端側の前記ハウジングと前記ヒータエレメントとの間隙に、酸化触媒成分を担持させた耐熱性ファイバー部材を備えることを特徴とする圧力センサ一体型グロープラグ。 - 前記耐熱性ファイバー部材が、セラミックファイバーに酸化触媒成分を担持させたものであることを特徴とする請求項1に記載の圧力センサ一体型グロープラグ。
- 前記耐熱性ファイバー部材が、前記ハウジングと前記ヒータエレメントとの間隙よりもさらに前記ハウジング外部にはみ出して設けられることを特徴とする請求項1又は2に記載の圧力センサ一体型グロープラグ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/418,309 US9683742B2 (en) | 2012-08-09 | 2013-06-20 | Pressure sensor integrated glow plug |
EP13827498.0A EP2884180B1 (en) | 2012-08-09 | 2013-06-20 | Pressure sensor type glow plug |
KR1020157003263A KR101634093B1 (ko) | 2012-08-09 | 2013-06-20 | 압력 센서 일체형 글로 플러그 |
CN201380041897.6A CN104508380B (zh) | 2012-08-09 | 2013-06-20 | 压力传感器一体式热线点火塞 |
JP2014529346A JP5872697B2 (ja) | 2012-08-09 | 2013-06-20 | 圧力センサ一体型グロープラグ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-176758 | 2012-08-09 | ||
JP2012176758 | 2012-08-09 |
Publications (1)
Publication Number | Publication Date |
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WO2014024576A1 true WO2014024576A1 (ja) | 2014-02-13 |
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ID=50067817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/066942 WO2014024576A1 (ja) | 2012-08-09 | 2013-06-20 | 圧力センサ一体型グロープラグ |
Country Status (6)
Country | Link |
---|---|
US (1) | US9683742B2 (ja) |
EP (1) | EP2884180B1 (ja) |
JP (1) | JP5872697B2 (ja) |
KR (1) | KR101634093B1 (ja) |
CN (1) | CN104508380B (ja) |
WO (1) | WO2014024576A1 (ja) |
Cited By (2)
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JP2015004462A (ja) * | 2013-06-19 | 2015-01-08 | 日本特殊陶業株式会社 | 燃焼圧センサ付きグロープラグ |
JPWO2016080105A1 (ja) * | 2014-11-21 | 2017-06-29 | ボッシュ株式会社 | セラミックスヒータ型グロープラグの製造方法及びセラミックスヒータ型グロープラグ |
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WO2014122957A1 (ja) * | 2013-02-08 | 2014-08-14 | ボッシュ株式会社 | 圧力センサ一体型グロープラグ及びその製造方法 |
US10253982B2 (en) * | 2014-12-22 | 2019-04-09 | Ngk Spark Plug Co., Ltd. | Glow plug with pressure sensor |
DE102016114929B4 (de) * | 2016-08-11 | 2018-05-09 | Borgwarner Ludwigsburg Gmbh | Druckmessglühkerze |
CN108869139B (zh) * | 2018-06-12 | 2020-08-18 | 中国煤炭科工集团太原研究院有限公司 | 一种矿用防爆柴油机低温辅助启动装置的制备方法 |
CN108798965B (zh) * | 2018-06-12 | 2021-02-02 | 中国煤炭科工集团太原研究院有限公司 | 一种矿用防爆柴油机低温辅助启动装置 |
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2013
- 2013-06-20 KR KR1020157003263A patent/KR101634093B1/ko active IP Right Grant
- 2013-06-20 EP EP13827498.0A patent/EP2884180B1/en not_active Not-in-force
- 2013-06-20 JP JP2014529346A patent/JP5872697B2/ja not_active Expired - Fee Related
- 2013-06-20 US US14/418,309 patent/US9683742B2/en not_active Expired - Fee Related
- 2013-06-20 WO PCT/JP2013/066942 patent/WO2014024576A1/ja active Application Filing
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JP2009520941A (ja) | 2005-12-23 | 2009-05-28 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | シース形グロープラグ |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015004462A (ja) * | 2013-06-19 | 2015-01-08 | 日本特殊陶業株式会社 | 燃焼圧センサ付きグロープラグ |
JPWO2016080105A1 (ja) * | 2014-11-21 | 2017-06-29 | ボッシュ株式会社 | セラミックスヒータ型グロープラグの製造方法及びセラミックスヒータ型グロープラグ |
Also Published As
Publication number | Publication date |
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EP2884180B1 (en) | 2016-12-21 |
KR20150042200A (ko) | 2015-04-20 |
JPWO2014024576A1 (ja) | 2016-07-25 |
US20150300643A1 (en) | 2015-10-22 |
US9683742B2 (en) | 2017-06-20 |
EP2884180A1 (en) | 2015-06-17 |
CN104508380B (zh) | 2016-04-27 |
CN104508380A (zh) | 2015-04-08 |
JP5872697B2 (ja) | 2016-03-01 |
EP2884180A4 (en) | 2015-08-26 |
KR101634093B1 (ko) | 2016-06-28 |
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