EP1637806B1 - Bougie de préchauffage avec capteur de pression pour moteur diesel - Google Patents

Bougie de préchauffage avec capteur de pression pour moteur diesel Download PDF

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Publication number
EP1637806B1
EP1637806B1 EP05015804A EP05015804A EP1637806B1 EP 1637806 B1 EP1637806 B1 EP 1637806B1 EP 05015804 A EP05015804 A EP 05015804A EP 05015804 A EP05015804 A EP 05015804A EP 1637806 B1 EP1637806 B1 EP 1637806B1
Authority
EP
European Patent Office
Prior art keywords
pressure sensor
plug body
bellows
heating rod
pressure
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.)
Active
Application number
EP05015804A
Other languages
German (de)
English (en)
Other versions
EP1637806A3 (fr
EP1637806A2 (fr
Inventor
Michael Haussner
Frank Pechhold
Hans Houben
Friedrich Mayr
Ulf Wyrwich
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.)
BorgWarner Ludwigsburg GmbH
Sensata Technologies Holland BV
Original Assignee
Beru AG
Sensata Technologies Holland BV
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
Priority claimed from DE200410044727 external-priority patent/DE102004044727A1/de
Application filed by Beru AG, Sensata Technologies Holland BV filed Critical Beru AG
Publication of EP1637806A2 publication Critical patent/EP1637806A2/fr
Publication of EP1637806A3 publication Critical patent/EP1637806A3/fr
Application granted granted Critical
Publication of EP1637806B1 publication Critical patent/EP1637806B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F23Q7/22—Details
    • 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 invention relates to a Druckmessglühkerze for a diesel engine according to the preamble of claim 1.
  • a seal between the heating element and the plug body is provided in such a pressure measuring glow plug, which is formed of a metal membrane or of an elastomeric seal.
  • a metal diaphragm as a seal has the disadvantage of a stiff spring characteristic and a small spring travel, resulting in a component load.
  • An elastomeric seal on the other hand, is temperature sensitive.
  • a seal in the form of a bellows-type component is provided in the Druckmessglühkerze of the type mentioned between the heating element and the plug body.
  • a bellows-type seal has the advantage that an absolute tightness of the Druckmessglühkerze is guaranteed in the range of the heating element to the plug body relative to the applied combustion pressure.
  • the spring line can be influenced, that is to say selected in the desired manner.
  • Another advantage is that influences on the pressure sensor due to thermal stress during annealing and at different engine load conditions are minimal.
  • a Druckmessglühkerze for a diesel engine consists essentially of a plug body 3, 4, a heating element 1 with metallic or ceramic structure, which is arranged in the axial direction relative to the plug body 3, 4 slidably displaceable in the plug body, a pressure sensor 7, possibly is arranged under a bias voltage by means of a sensor unit 5 between the heating element 1 and the plug body 3, 4 and is acted upon by the pressure prevailing in the combustion chamber of the cylinder pressure, wherein the heating element 1 transmits the pressure in the combustion chamber of the cylinder to the pressure sensor 7.
  • the heating element 1 is slidably disposed in the axial direction relative to the plug body 3, 4, such that the pressure in the combustion chamber leads to an axial movement of the heating element 1 relative to the plug body 3, 4, through which the pressure sensor 7 is acted upon by a force.
  • the heating element 1 is mechanically fixedly connected via an extension pipe to the pressure sensor 7 and a bellows 2, which is arranged as a sealing element between the heating element 1 and the glow plug body 3, 4 and ensures that the heating element 1 without friction in the plug body 3, 4 can move in the axial direction.
  • the bellows 2 which preferably consists of a metal material, mechanically connected to the heating element 1, for example, characterized in that on the front side of the cylindrical part of the bellows 2 to the heating element 1 toward a radially encircling Fillet weld or in the cylindrical part of the bellows 2 a radially encircling through-welding is provided.
  • the connection can be achieved in this area to the heating element by laser welding, crimping, swaging, soldering, pressing on, etc.
  • the plug body 3, 4 consists of two parts, namely a body upper part 3 and a body lower part 4, which are mechanically connected to one another.
  • the body lower part 4 is provided on the combustion chamber side with a sealing cone, via which the glow plug to the cylinder head seals the combustion pressure.
  • the bellows 2 is mechanically connected on the connection side to the body upper part 3. Also at this point, the bellows 2 may be formed with a cylindrical part which is pushed onto the outside of the shaft of the body shell 3 and is mechanically connected thereto. Other connection options are the same as in the connection of the bellows 2 to the heating element. 1
  • the front seal thus consists of a bellows-like component, which may be formed as a metal bellows.
  • the axial displaceability of the heating element 1 is ensured with extensive linearity of the force path characteristic.
  • the heating element 1 is thermally decoupled from the plug body 3, 4 and the heating element 1 is elastically supported in the plug body 3, 4 via the bellows 2.
  • About the bellows 2 can continue to be exercised a bias.
  • the heating element 1 is displaced in the axial direction to the sensor element 7, which sits at the connection end of the heating element 1 and in the form of a piezoelectric sensor, a strain gauge or a is formed similar measuring element.
  • the heating element 1 presses with a certain force on the sensor element 7, whereby a change in the sensor element lying force or voltage is effected, which is further processed via a suitable evaluation electronics to a measurement signal.
  • the advantage of the bellows 2 is that by a small spring characteristic, that is, a small spring force in a long way, the influence due to thermal stresses on the sensor element can be kept very small.
  • a small spring characteristic that is, a small spring force in a long way
  • the influence due to thermal stresses on the sensor element can be kept very small.
  • the glow operation of the Druckmessglühkerze or at different load and speed ranges continues to warm the heating element 1 between the two contact points on the sensor element and the combustion chamber, which would mean that too high a voltage is transmitted to the sensor element in a too rigid combustion chamber seal and thus a faulty measurement is the result.
  • the combustion chamber seal is designed to be too stiff, that is to say if the spring force is too high for a small distance, no measurable change would occur at the sensor element and thus no measurement signal would result.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Measuring Fluid Pressure (AREA)
  • Testing Of Engines (AREA)

Claims (3)

  1. Bougie de préchauffage avec capteur de pression pour un moteur diesel, avec :
    - un corps de bougie (3, 4) à introduire dans un cylindre du moteur diesel ;
    - une tige de chauffage (1), qui est disposée dans le corps de bougie ; et
    - un capteur de pression (7), qui est disposé sous une précontrainte entre la tige de chauffage et le corps de bougie, de telle manière que le capteur de pression soit exposé à la pression régnant dans la chambre de combustion du cylindre ; dans laquelle
    - la tige de chauffage (1) transmet la pression régnant dans la chambre de combustion du cylindre au capteur de pression (7) ; et
    - la tige de chauffage (1) est disposée dans le corps de bougie de façon déplaçable en glissement en direction axiale par rapport au corps de bougie (3, 4), de telle manière que la pression dans la chambre de combustion conduise à un déplacement axial de la tige de chauffage par rapport au corps de bougie, soumettant ainsi le capteur de pression (7) à une force,
    caractérisée en ce qu'il est prévu entre la tige de chauffage (1) et le corps de bougie (3, 4) un joint d'étanchéité (2) sous la forme d'un composant de type soufflet.
  2. Bougie de préchauffage avec capteur de pression selon la revendication 1, caractérisée en ce que le composant de type soufflet est un soufflet métallique à plusieurs couches.
  3. Bougie de préchauffage avec capteur de pression selon la revendication 1 ou 2, caractérisée en ce que le corps de soupape (3, 4) se compose de deux parties, à savoir une partie supérieure de corps (3) et une partie inférieure de corps (4), qui sont assemblées mécaniquement l'une à l'autre, dans laquelle le composant de type soufflet est disposé dans la région de la partie inférieure de corps et est attaché à son extrémité côté raccord à la partie supérieure de corps.
EP05015804A 2004-09-15 2005-07-20 Bougie de préchauffage avec capteur de pression pour moteur diesel Active EP1637806B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410044727 DE102004044727A1 (de) 2003-09-19 2004-09-15 Druckmessglühkerze für einen Dieselmotor

Publications (3)

Publication Number Publication Date
EP1637806A2 EP1637806A2 (fr) 2006-03-22
EP1637806A3 EP1637806A3 (fr) 2006-04-12
EP1637806B1 true EP1637806B1 (fr) 2012-02-01

Family

ID=35431259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05015804A Active EP1637806B1 (fr) 2004-09-15 2005-07-20 Bougie de préchauffage avec capteur de pression pour moteur diesel

Country Status (5)

Country Link
US (1) US7228730B2 (fr)
EP (1) EP1637806B1 (fr)
JP (1) JP5132046B2 (fr)
KR (1) KR101229962B1 (fr)
AT (1) ATE544034T1 (fr)

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Also Published As

Publication number Publication date
JP2006084468A (ja) 2006-03-30
ATE544034T1 (de) 2012-02-15
JP5132046B2 (ja) 2013-01-30
EP1637806A3 (fr) 2006-04-12
KR101229962B1 (ko) 2013-02-06
EP1637806A2 (fr) 2006-03-22
US20060053875A1 (en) 2006-03-16
US7228730B2 (en) 2007-06-12
KR20060051268A (ko) 2006-05-19

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