EP1305587A1 - Bougie d'allumage destinee a recevoir un capteur de pression et prise de bougie d'allumage associee - Google Patents

Bougie d'allumage destinee a recevoir un capteur de pression et prise de bougie d'allumage associee

Info

Publication number
EP1305587A1
EP1305587A1 EP01943009A EP01943009A EP1305587A1 EP 1305587 A1 EP1305587 A1 EP 1305587A1 EP 01943009 A EP01943009 A EP 01943009A EP 01943009 A EP01943009 A EP 01943009A EP 1305587 A1 EP1305587 A1 EP 1305587A1
Authority
EP
European Patent Office
Prior art keywords
spark plug
housing
connection
central section
connection channel
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01943009A
Other languages
German (de)
English (en)
Inventor
Wolfgang Herbert
Bernd Mueller
Arnold Krieger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1305587A1 publication Critical patent/EP1305587A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines

Definitions

  • the invention relates to a spark plug with an insulator core extending along the longitudinal axis of the spark plug.
  • the insulator core tapers on one side from a central section to an insulator foot.
  • the central section and the insulator foot are surrounded by a spark plug housing, which is designed in the area of the insulator foot as an axially extending threaded sleeve with an external thread.
  • a sensor receiving space for receiving a sensor element is recessed in the threaded sleeve.
  • a trained in the threaded sleeve Conn-üsskanal • extends from the 'sensor location approximately parallel to L Lucassachsein of the threaded sleeve and on to a -Außenseite of the housing.
  • a spark plug with a pressure sensor built into the sensor receiving space is known from Japanese patent application JP 092 600 24 A.
  • the other end of the connection channel lies in the edge region of a middle housing part.
  • a connection electrode is on the side a nut formed on the housing for screwing in the spark plug.
  • the connection channel is guided obliquely outwards from the transition between the housing sleeve and the housing middle part.
  • spark plugs with 'pressure sensors in the housing sleeve are from the U.S. -Patent 4,969,353 and from the PCT-. Application WO 9731251 known. In the spark plugs explained there, the connection channel in the middle part of the housing is also guided obliquely outwards.
  • the invention is based on the problem of improving the spark plugs with a sensor installed in the housing sleeve.
  • a spark plug is to be indicated, which is particularly suitable for connecting an ignition cable and a feed line for the sensor to the spark plug improved '.
  • the invention solved a spark plug with the features specified in claim 1. Further training is in the
  • the invention is based on the following considerations.
  • connection cable that connects the sensor element to a sensor circuit. If the connection cable, which is relatively thin compared to the ignition cable, is led laterally outwards in a section of the connection channel, there is a large distance between the ignition cable and the connection cable. This distance has to be led to the consequence that the connection cable in a longer section separately from the "ignition cable ⁇ iuss. This results in that the connection cable during installation of the spark plug in the engine block can easily wexden clamped between the wrench and DER formed on the spark plug screw.
  • connection electrode Even if the ignition cable is only connected to a connection electrode after the spark plug has been screwed into the engine block, the connection electrode may be damaged during installation.
  • the section in which the connection cable of the sensor is routed separately from the ignition cable is also after installation of the Spark plug and connecting the connection cable unprotected in the engine block.
  • the spark plug according to the invention is designed such that a section of the connection channel runs in the central section of the insulator core.
  • the connection channel emerges on the side of the housing closest to the connection for the ignition cable and / or out of the isolator core.
  • the connection channel and thus also the connection cable received in the connection channel as a whole can be '' Guide the area of the housing close to the ignition cable or the longitudinal axis of the spark plug.
  • the outlet of the connection channel is very close to the longitudinal axis of the spark plug, for example , at a distance of less than 10 mm, preferably less than 5 mm.
  • the spark plug according to the invention therefore enables the connection cable to be guided in a protected manner along its entire length or at least in areas which are exposed to mechanical effects when the spark plug is installed.
  • connection channel in the central section of the insulator core runs approximately parallel to the longitudinal axis of the spark plug. If the connection duct is also routed in the central section of the isolator core parallel to the ⁇ longitudinal axis or at an insignificant inclination of, for example, 1 or 2 °, kinks in the course of the connection duct can be avoided.
  • the connection channel runs straight so that a connection cable is not kinked in the connection channel and can be easily installed.
  • the connection channel in the central section of the insulator core runs obliquely to the longitudinal axis of the spark plug, preferably at an angle between 10 ° and 5 °.
  • the angle makes it possible to insert the 5 connection channel in the area of the insulator core without expensive special tools, e.g. with the help of a reamer.
  • the angle should not exceed 10 °, otherwise a connection channel that runs diagonally outwards ends too far from the ignition cable.
  • a connection duct routed obliquely to • 1.0 is no longer completely isolated by the isolator core.
  • connection channel in the longitudinal direction at the transitions
  • the curvature is preferably less than 10 or less than 5 °. With such a slightly curved course, a protective cover and / or the connecting cable can still be easily inserted into the connecting channel.
  • connection channel lies between the insulator core and the housing. This measure in particular for spark plugs, which also taper towards the connection for the ignition cable.
  • connection channel 25 is sufficient that the connection channel must be routed only in a comparatively short section of the isolator core.
  • the connection duct can be made through the same opening in the housing. through which the isolator core is also guided. If necessary, a small recess is formed at the opening of the housing surrounding the insulator core.
  • connection channel If the other end of the connection channel is close to the insulator core, preferably at a distance of less than 5 mm, a connection cable can be led directly from the end of the connection channel into a spark plug connector and its entire course is protected.
  • the sensor element is pressure-sensitive, so that the sensor signal depends on the pressure acting on the sensor element.
  • a piezoelectric, a piezoresistive or an electrodynamically working sensor element is preferably used.
  • optical sensors available.
  • sensor elements are available in the market that ze into the threaded sleeve of the Spark Plug 'can also be installed when the threaded sleeve. the usual dimensions for spark plugs without sensor element.
  • the arrangement of the center and the ' ground electrode as well as the heat value correspond with the arrangements or with the heat value of the original candle.
  • the combustion properties and the pressure curve in the combustion chamber are the same between previously used series candles and the spark plug with pressure sensor. In particular, the "breathing" properties of the spark plug remain unchanged.
  • the insulator core tapers from the central section to a connection for an ignition cable. The central section has the largest diameter and is used to attach the housing.
  • the invention also relates to a spark plug connector which is particularly suitable for the spark plug according to the invention or its developments.
  • the spark plug connector has a housing which is usually made in one piece and in which a bushing for an ignition cable is arranged.
  • a further bushing for receiving a connection line for a sensor element arranged in the spark plug is included. If the outlet of the connection channel is at a distance from the longitudinal axis of the spark plug that is smaller than the radius of the spark plug connector, the entire connection line can be opened. Guide the course to the sensor element protected.
  • the connecting cable is routed in the housing and in the isolator core within the spark plug.
  • the connecting cable is run between the insulator core and the spark plug connector.
  • the relatively thin connection cable can 'z. B. can be connected via a plug-in connection with a thicker cable, which contains, for example, a solid protective sheath and a shield.
  • the bushings are arranged eccentrically with respect to the longitudinal axis of the spark plug connector. This measure makes it possible to manufacture the spark plug connector with a small diameter, nevertheless ensuring a sufficient distance between the ignition cable and the connecting line of the sensor element.
  • FIG. 1 shows a spark plug in a side view and a partial sectional view
  • FIG. 2 shows an enlarged representation of a connection channel in the area of a threaded sleeve of the spark plug
  • Figure 3 is an enlarged view of the connection channel. in the area of the insulator core of the spark plug.
  • FIG. 1 ' shows a spark plug 10, which has the usual dimensions.
  • a spark plug connector 12 is plugged onto the spark plug 10 and is used to connect an ignition cable 14 and a connecting line 16.
  • the ignition cable 14 carries an ignition voltage of up to 40 kV and is screwed onto a connecting bolt 18.
  • the connecting line 16 serves to carry the signal coming from a pressure sensor 20.
  • the signal values of this signal are, for example, at most 12 V.
  • a connecting element 24 is arranged in the area of the plug connector 12, for example a plug-in connecting element, with the aid of which a connecting wire 26 and the connecting line 16 are electrically connected to one another.
  • a metallic spark plug housing 28 encloses the lower part of an insulator core 30, which consists of a ceramic material.
  • the insulator core 30 tapers from a central section 32 to its ends.
  • the connecting bolt 18 is arranged at the upper end of the insulator core 30.
  • Leakage current barriers 34 are expediently formed on the surface of the insulator core 30 between the connecting bolts 18 and the central section 22.
  • the insulator core 30 tapers downward to an insulator foot 36 which insulates a central electrode 38.
  • the center electrode 38 is electrically conductively connected to the connecting bolt 18.
  • a screw nut 40, a central housing part 42 and a housing sleeve 44 are formed on the housing 28, each of which encompasses the insulator core 30.
  • an inwardly curved edge -46 encompasses the central section 32 of the
  • the screw nut 40 is e.g. hexagonal and can be screwed using a standard candle wrench.
  • the housing sleeve 44 carries an external thread 52, which is not. corresponds to the internal thread shown in the engine block.
  • the connection thread 52 is, for. B. an M18 external thread.
  • the housing sleeve 44 carries at its end a roof electrode 54 which is curved inwards and thus forms an ignition gap of a predetermined width between the center electrode 38 and the roof electrode 54.
  • the receiving space 56 is cylindrical.
  • the longitudinal axis 58 of this cylinder is parallel to the longitudinal axis 60 of the spark plug. In principle, the longitudinal axis 58 of this cylinder could also lie obliquely to the longitudinal axis 60 of the spark plug.
  • a connecting channel 62 leads from the receiving space 56 parallel to the longitudinal axis 60 in the direction of the connecting bolt 18.
  • the connection channel is also guided approximately parallel to the longitudinal axis 60 ' .
  • the connection channel 62 is lined with an inserted protective cover 64.
  • the protective sheath 64 encases the connecting wire 26 in the area of the spark plug housing 28.
  • connection channel 62 in the area of the spark plug housing and in the central section 32 of the insulator core 30 is explained in more detail below with reference to FIGS. 2 and 3.
  • the bushing for the connecting channel 62 in the central section 32 is first introduced into the insulator core 30, for example by grinding with a grinding awl. Only then is the insulator core 30 connected to the housing 28. The bushing for the connection channel 68 in the housing 28 is introduced before or after the housing 28 and the insulator core 30 are connected, for example by drilling. 'Prior to joining housing 28 and insulator core 30, the protective sheath 64 is inserted. Then the sensor element 20 and the connecting wire 26 are introduced and bonded gas-tight.
  • FIG. 2 shows an enlarged illustration of the connection channel 58 in the. Area of the threaded sleeve 44.
  • the reference symbols shown in FIG. 2 correspond to the reference symbols already explained with reference to FIG. 1.
  • Receiving space -56, connection channel 62 and protective sleeve 64 are aligned in the area shown with respect to the longitudinal axis 58 of the connection channel 62.
  • the diameter of the port channel 62 in this example is smaller than the diameter of the receiving chamber '56.
  • the protective sleeve 64' is the diameter of the connection channel 62 somewhat as is larger in a region 80, the space directly on the recording 56 and not from the Protective sleeve 64 is surrounded.
  • a shoulder 82 serves as a stop when the protective sleeve 64 is inserted into the connection channel 62.
  • FIG. 2 also shows a sealing element 86 which runs around the longitudinal axis 60 and which lies between the insulator foot 36 and the housing sleeve 44.
  • the center electrode 38 ends in an area filled with a glass melt 88.
  • the glass melt 88 forms an electrical resistance in the milliohm range (kilo-ohm range also possible) between the center electrode 38 and an electrode 90 leading to the connecting pin 18.
  • FIG. 3 shows an enlarged illustration of the connection channel 62 in the region of the central section 32 of the insulator core 30.
  • the reference symbols shown in FIG. 3 correspond to the reference symbols explained with reference to FIG. 1.
  • the connection channel 62 initially enters from the middle housing part 42 into an interior space 90 surrounded by the spark plug housing 28. At the entry or exit point from the - central portion 42 • the course of the plenum is bent to egg NEN angle Wl 62, which is about 5 °.
  • the connection channel 62 is formed by the protective sleeve 64 between the middle housing part 42 and the insulator core 30.
  • an area 92 of the insulator core 30 is created which lies between the connection channel 62 and the housing 28.
  • the connection channel 62 is bent in the area of the edge 46 by an angle W2, for example by approximately 9 °.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spark Plugs (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne une bougie d'allumage (10) destinée à recevoir un capteur de pression (20). Un canal de raccordement (62) destiné à guider un câble d'alimentation du capteur (20) passe dans un boîtier (28) et dans une section centrale (32) du noyau isolateur (30) de la bougie d'allumage (10). Cette configuration permet de guider, de façon protégée, le câble de raccordement (26) dans la zone de la bougie d'allumage (10).
EP01943009A 2000-07-21 2001-05-03 Bougie d'allumage destinee a recevoir un capteur de pression et prise de bougie d'allumage associee Withdrawn EP1305587A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10035536A DE10035536C2 (de) 2000-07-21 2000-07-21 Zündkerze zur Aufnahme eines Drucksensors und zugehöriger Zündkerzenstecker
DE10035536 2000-07-21
PCT/DE2001/001679 WO2002008714A1 (fr) 2000-07-21 2001-05-03 Bougie d'allumage destinee a recevoir un capteur de pression et prise de bougie d'allumage associee

Publications (1)

Publication Number Publication Date
EP1305587A1 true EP1305587A1 (fr) 2003-05-02

Family

ID=7649732

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01943009A Withdrawn EP1305587A1 (fr) 2000-07-21 2001-05-03 Bougie d'allumage destinee a recevoir un capteur de pression et prise de bougie d'allumage associee

Country Status (5)

Country Link
US (1) US6952948B2 (fr)
EP (1) EP1305587A1 (fr)
JP (1) JP2004505406A (fr)
DE (1) DE10035536C2 (fr)
WO (1) WO2002008714A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004002905B4 (de) * 2004-01-20 2006-05-18 Beru Ag Glühkerzenstecker
US20060027013A1 (en) * 2004-08-05 2006-02-09 Honda Motor Co., Ltd. Combustion pressure detecting apparatus
JP2006324120A (ja) * 2005-05-19 2006-11-30 Nissan Motor Co Ltd 内燃機関の点火プラグ
US7840102B2 (en) * 2007-01-16 2010-11-23 Baker Hughes Incorporated Distributed optical pressure and temperature sensors
US8417084B2 (en) * 2007-01-16 2013-04-09 Baker Hughes Incorporated Distributed optical pressure and temperature sensors
JP4483955B2 (ja) * 2008-02-28 2010-06-16 株式会社デンソー エンジンヘッドモジュール
CH699078A1 (de) * 2008-07-02 2010-01-15 Kistler Holding Ag Zündkerze im Grundaufbau mit Drucksensor.
AT510718B1 (de) * 2011-03-18 2012-06-15 Piezocryst Advanced Sensorics Isolator für eine zündkerze mit sensorfunktion, sowie zündkerze mit sensorfunktion
DE102013022497B3 (de) 2013-08-27 2018-06-14 Federal-Mogul Ignition Gmbh Vorkammerzündkerze mit Drucksensor für eine mit Gas betriebene Brennkraftmaschine
DE102013109278B4 (de) 2013-08-27 2017-12-07 Federal-Mogul Ignition Gmbh Zündkerze für eine mit Gas betriebene Brennkraftmaschine
US10177539B2 (en) 2015-01-28 2019-01-08 Federal-Mogul Ignition Company Method and tooling for making an insulator for a condition sensing spark plug

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DE3514597A1 (de) * 1985-04-23 1986-10-30 Robert Bosch Gmbh, 7000 Stuttgart Zuendkerze mit einer druckmessvorrichtung
JPS6454686A (en) * 1987-08-24 1989-03-02 Ngk Spark Plug Co Spark plug with built-in pressure sensor and plug cap thereof
JPH01272073A (ja) * 1988-04-22 1989-10-31 Ngk Spark Plug Co Ltd 圧力センサー内蔵スパークプラグ
JPH01283786A (ja) * 1988-05-11 1989-11-15 Ngk Spark Plug Co Ltd 圧力センサー内蔵スパークプラグ
JPH03110780A (ja) 1989-09-26 1991-05-10 Ngk Spark Plug Co Ltd 光センサ内蔵型スパークプラグ
US5180983A (en) 1990-09-27 1993-01-19 Mitsubishi Denki K.K. Ignition plug for an internal combustion engine provided with an ionization current detector electrode
US6131465A (en) * 1993-07-01 2000-10-17 Wlodarczyk; Marek T. Fiber optic combustion pressure sensors for engine knock and misfire detection
WO1997031251A1 (fr) * 1995-02-21 1997-08-28 Optrand, Inc. Capteurs a fibre optique sensibles a la pression de combustion, permettant de detecter les cognements et les rates d'allumage d'un moteur
JPH09260024A (ja) * 1996-03-26 1997-10-03 Ngk Spark Plug Co Ltd 圧力センサ内蔵スパークプラグ
US6122971A (en) * 1996-10-23 2000-09-26 Wlodarczyk; Marek T. Integrated fiber optic combustion pressure sensor
AU7519296A (en) 1996-10-23 1998-05-15 Optrand, Inc. Integrated fiber optic combustion pressure sensor
US6204594B1 (en) * 1998-06-12 2001-03-20 Cooper Automotive Products, Inc. Spark plug with pressure sensor
US6094990A (en) 1998-06-30 2000-08-01 Cooper Automotive Products, Inc. Spark plug with concentric pressure sensor
AT407577B (de) * 1999-08-05 2001-04-25 Avl List Gmbh Zündkerze mit einer druckmesseinrichtung

Non-Patent Citations (2)

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Title
None *
See also references of WO0208714A1 *

Also Published As

Publication number Publication date
US6952948B2 (en) 2005-10-11
DE10035536A1 (de) 2002-02-07
US20040045345A1 (en) 2004-03-11
DE10035536C2 (de) 2003-06-05
JP2004505406A (ja) 2004-02-19
WO2002008714A1 (fr) 2002-01-31

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