EP2105670A2 - Bougie de préchauffage - Google Patents

Bougie de préchauffage Download PDF

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Publication number
EP2105670A2
EP2105670A2 EP09100081A EP09100081A EP2105670A2 EP 2105670 A2 EP2105670 A2 EP 2105670A2 EP 09100081 A EP09100081 A EP 09100081A EP 09100081 A EP09100081 A EP 09100081A EP 2105670 A2 EP2105670 A2 EP 2105670A2
Authority
EP
European Patent Office
Prior art keywords
glow plug
glow
coil
resistance
connection point
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Withdrawn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
EP09100081A
Other languages
German (de)
English (en)
Other versions
EP2105670A3 (fr
Inventor
Andreas Reissner
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 EP2105670A2 publication Critical patent/EP2105670A2/fr
Publication of EP2105670A3 publication Critical patent/EP2105670A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a glow plug according to the preamble of claim 1.
  • Such a glow plug is for example off DE 10 157 466 A1 known.
  • an electric heater is embedded with a heating coil and a control coil connected in series in a glow tube filled with an insulating powder, wherein the heating coil consists of an Fe-Cr-Al alloy.
  • the control coil can consist of a nickel or a cobalt-iron alloy.
  • the heating coil is welded to the top of the glow tube with this.
  • the connection between heating coil and control coil is also welded.
  • the remaining volume within the glow tube is filled with the ceramic insulating powder, for example magnesium oxide.
  • low-voltage glow plugs are known, for example, in MTZ (Motortechnische Zeitschrift) 10/2000, "The electronically controlled glow system GSS for diesel engines" are described.
  • Such low voltage glow plugs or quick start glow plugs are designed for speed and controllability. You reach your nominal temperature with a supply voltage that is well below the available on-board voltage of, for example, 7 to 12 V during preheating. The nominal voltage is between 4 and 7 V.
  • the advantages of this glow plugs is the short heating time and the ability to set or apply the temperature at different engine conditions. Even when starting the engine when the on-board voltage drops to 7 V, at least the full nominal voltage is still available to these glow plugs.
  • the temperature of the glow plug results from the applied effective voltage, which is generated by pulse width modulation and the cooling by the motor.
  • These glow plugs are also applied in the vehicle with special measuring glow plugs, which have, for example, a built-in thermocouple.
  • the heating coils of such low-voltage glow plugs have a heating conductor material made of an Fe-Cr-Al alloy with a correspondingly high specific electrical resistance and a very low electrical temperature coefficient.
  • the control coil on the other hand, has a very low specific electrical resistance at room temperature.
  • the temperature coefficient of the control coil is very large.
  • a typical material for the control coil is nickel, which at 1000 ° C has about 6 times greater electrical resistivity than at room temperature. At room temperature, the heating coil provides over 80% of the electrical resistance.
  • the control coil increases in resistance due to self-heating and the heat flowing from the heating coil towards the control coil. This increases the resistance of the control coil and thus the total resistance. The power decreases and the power is reduced.
  • the electrical resistance of the glow plug at room temperature and below can be kept low. In operation, the electrical resistance is then much higher. In this way tolerances are compensated and raised the nominal voltage.
  • the low-voltage glow plugs are operated for a short time at about 11 V. Through this process, it is possible that the low-voltage glow plug will heat up to 1000 ° C in about 2 seconds.
  • the peaks are only 100 to 200 ° C below the melting temperature of the material of the heating coil. Due to careless application or faulty control components, this massive increase in temperature during the heating process can lead to the melting point of the glow tube, which lies below the melting point of the materials of the heating coil or control coil of the heating device, being reached or exceeded. As a result, the glow tube melts before the glow plug on the heating coil and / or control coil burns. As a result, material parts of the glow tube of the glow plug can get into the combustion chamber and damage the engine.
  • Object of the present invention is to install a fuse system in the circuit of the glow plug, which prevents melting of the glow plug of the glow plug, so as to prevent engine damage, so that only the cheapest glow plug must be replaced.
  • the object of the invention is achieved with the characterizing features of claim 1.
  • the fuse with a melting temperature below the melting temperature of the glow tube prevents the glow tube melts.
  • the fuse is formed at least one point in the circuit on a heater forming an electrical resistance element.
  • connection point which acts as a fuse is particularly advantageous. It is expedient to produce the joint, for example by means of a brazing material and adjust the melting point of the fuse by the choice of brazing material. If the temperature in the interior of the glow tube exceeds the melting point of the brazing material, the solder joint melts and the circuit is interrupted. The solder creeps into the residual porosity of the ceramic insulating powder. The process is then not reversible.
  • the solder connection can be between heating coil and control coil. But it is also possible to separate the heating coil and / or the control coil at a suitable location and to provide the solder joint, which forms the fuse. Since the temperature in the Schuetzl Symposium varies depending on the location, a temperature adjustment can also be made by the choice of the location of the solder joint.
  • the glow plug is provided for arrangement in a combustion chamber, not shown, of an internal combustion engine.
  • the glow plug has a tubular housing 10 with a longitudinal bore 12 into which a glow plug 13 is sealingly fixed with its length.
  • the glow plug 13 has an glow tube 14, which is closed at its combustion chamber end 15.
  • an electrical resistance element 17 as a heater.
  • the back-up member 17 is embedded in a ceramic insulating powder 18, which is, for example, magnesium oxide powder.
  • the resistance element 17 is remote from the combustion chamber provided with a connection part 19 for contacting with an electrical circuit. At the combustion chamber end, the resistance element 17 is contacted with the glow tube 14, z. B. welded.
  • the illustrated resistance element 17 consists of two series-connected resistance coils, wherein the combustion chamber-side resistance coil, a heating coil 21 and the combustion chamber remote resistance coil a control coil 22 forms.
  • the effect of the heating coil 21 and the control coil 22 has already been explained in the introduction in connection with the assessment of the prior art.
  • the glow tube 14 consists for example of a nickel alloy with a chemical composition NiCr23Fe or NiCr25FeAlY, which are also known under the material number 2.4851 or 2.4633.
  • the melting temperature of these materials is, for example, about 1400 ° C.
  • FIG. 2 shows a junction 30 with a first resistance coil section 31 and a second resistance coil section 32.
  • the resistance coil sections 31 and 22 are electrically conductively connected by means of a fusible material 33.
  • the meltable material forms a fuse for the circuit of the resistive element 17.
  • the fusible, electrically conductive material 33 is, for example, a brazing alloy having a melting point which is below the melting temperature of the material of the glow tube 14. The melting temperature can be adjusted by selecting the material of the brazing alloy.
  • Silver-containing brazing alloys cover a temperature range of 620 to 1200 ° C
  • copper-based solders cover a temperature range of 650 to 1100 ° C
  • nickel-based solders cover a temperature range of 880 ° C to 1150 ° C.
  • connection point 30 a distance between the resistance coil sections 31 and 32 is present, so that a Lotzone between the two wire ends is formed.
  • the distance between the resistance coil sections 31 and 32 is suitably chosen to be 0.1 to 1 mm. If the solder melts in an overheating, the solder material diffuses into the pores of the filling with the ceramic insulating powder 18. After melting, a distance between the Schuwarelabismeen 31, 32 must remain so that the circuit is interrupted. The distance is also not too large to choose so that the solder material can be absorbed by the surrounding insulating 18. For the same reason, the soldering zone should be carried out with as little solder material as possible.
  • a convenient place for forming the joint 30 is the connection between the heating coil 21 and control coil 22 according to FIG. 1 in which the first resistance coil section 31 forms the heating coil 21 and the second resistance coil section 32 forms the control coil 22.
  • a fast-acting fuse is present when the connection point 30 is in the region of the heating coil 21, since the heating coil 21 reaches high temperatures faster. If, however, a delay should be desired, the connection point 30 can also be formed in the region of the control coil 22.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
EP09100081.0A 2008-03-26 2009-01-28 Bougie de préchauffage Withdrawn EP2105670A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810015598 DE102008015598A1 (de) 2008-03-26 2008-03-26 Glühstiftkerze

Publications (2)

Publication Number Publication Date
EP2105670A2 true EP2105670A2 (fr) 2009-09-30
EP2105670A3 EP2105670A3 (fr) 2017-11-22

Family

ID=40823400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09100081.0A Withdrawn EP2105670A3 (fr) 2008-03-26 2009-01-28 Bougie de préchauffage

Country Status (2)

Country Link
EP (1) EP2105670A3 (fr)
DE (1) DE102008015598A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118724A1 (de) 2011-11-16 2013-05-16 Volkswagen Aktiengesellschaft Vorrichtung und System zur Stromversorgung von Glühstiften für ein Fahrzeug
WO2014206671A1 (fr) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Bougie de préchauffage et procédé pour la fabriquer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157466A1 (de) 2001-10-23 2003-04-30 Bosch Gmbh Robert Elektrisch beheizbare Glühkerze und Verfahren zur Herstellung einer elektrisch beheizbaren Glühkerze

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3915224A1 (de) * 1989-05-10 1990-11-15 Bosch Gmbh Robert Gluehstiftkerze
JPH0814376B2 (ja) * 1989-09-11 1996-02-14 自動車機器株式会社 自己温度制御型グロープラグ
JP2570481Y2 (ja) * 1991-05-30 1998-05-06 自動車機器株式会社 自己温度制御型グロープラグ
DE4301252A1 (de) * 1993-01-19 1994-07-21 Beru Werk Ruprecht Gmbh Co A Stabflammglühkerze

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157466A1 (de) 2001-10-23 2003-04-30 Bosch Gmbh Robert Elektrisch beheizbare Glühkerze und Verfahren zur Herstellung einer elektrisch beheizbaren Glühkerze

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011118724A1 (de) 2011-11-16 2013-05-16 Volkswagen Aktiengesellschaft Vorrichtung und System zur Stromversorgung von Glühstiften für ein Fahrzeug
DE102011118724B4 (de) * 2011-11-16 2015-09-03 Volkswagen Aktiengesellschaft Vorrichtung und System zur Stromversorgung von Glühstiften für ein Fahrzeug
WO2014206671A1 (fr) * 2013-06-26 2014-12-31 Robert Bosch Gmbh Bougie de préchauffage et procédé pour la fabriquer

Also Published As

Publication number Publication date
DE102008015598A1 (de) 2009-10-01
EP2105670A3 (fr) 2017-11-22

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