EP2105670A2 - Glow plug - Google Patents
Glow plug Download PDFInfo
- 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- Withdrawn
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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)
Abstract
Description
Die Erfindung betrifft eine Glühstiftkerze nach dem Oberbegriff des Anspruchs 1.The invention relates to a glow plug according to the preamble of claim 1.
Eine derartige Glühstiftkerze ist beispielsweise aus
Weiterhin sind sogenannte Niederspannungs-Glühstiftkerzen bekannt, die beispielsweise in MTZ (Motortechnische Zeitschrift) 10/2000, "Das elektronisch gesteuerte Glühsystem GSS für Dieselmotoren" beschrieben sind. Derartige Niederspannungsglühstiftkerzen oder Schnellstart-Glühkerzen sind auf Schnelligkeit und Steuerbarkeit ausgelegt. Sie erreichen Ihre Nominaltemperatur mit einer Versorgungsspannung, die deutlich unterhalb der verfügbaren Bordspannung von beispielsweise 7 bis 12 V während des Vorglühens liegt. Die Nominalspannung liegt dabei zwischen 4 und 7 V. Die Vorteile dieser Glühstiftkerzen liegt in der kurzen Aufheizzeit und in der Möglichkeit, die Temperatur bei verschiedenen Motorzuständen einzustellen bzw. zu applizieren. Selbst während des Startens des Motors, wenn die Bordspannung auf 7 V sinkt, steht diesen Glühstiftkerzen noch mindestens die volle Nominalspannung zur Verfügung. Die Temperatur der Glühstiftkerze ergibt sich durch die angelegte Effektivspannung, die durch Pulsweitenmodulation erzeugt wird und die Kühlung durch den Motor. Diese Glühstiftkerzen werden außerdem mit speziellen Messglühkerzen, die beispielsweise ein eingebautes Thermoelement aufweisen, im Fahrzeug appliziert. Die Heizwendeln derartiger Niederspannungs-Glühstiftkerzen weisen einem Heizleitermaterial aus einer Fe-Cr-Al-Legierung mit einem entsprechend hohen spezifischen elektrischen Widerstand und einem sehr niedrigen elektrischen Temperaturkoeffizienten auf. Die Regelwendel dagegen hat einen sehr niedrigen spezifischen elektrischen Widerstand bei Raumtemperatur. Der Temperaturkoeffizient der Regelwendel ist dafür sehr groß. Ein typisches Material für die Regelwendel ist Nickel, das bei 1000 °C einen etwa 6-mal größeren spezifischen elektrischen Widerstand aufweist, als bei Raumtemperatur. Bei Raumtemperatur stellt die Heizwendel über 80% des elektrischen Widerstands.Furthermore, so-called 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.
Wird an die Glühstiftkerze eine Spannung angelegt, fließt zunächst ein hoher Strom, der aufgrund der Widerstandsverteilung vor allem den Bereich der Heizwendel aufheizt. Die Regelwendel steigt im Widerstand durch Eigenerwärmung und der Wärme, die von der Heizwendel Richtung Regelwendel fließt. Dadurch steigt der Widerstand der Regelwendel und damit der Gesamtwiderstand. Der Strom verringert sich und die Leistung wird verkleinert. Durch die Regelwendel kann daher der elektrische Widerstand der Glühstiftkerze bei Raumtemperatur und darunter niedrig gehalten werden. Im Betrieb ist der elektrische Widerstand dann wesentlich höher. Auf diese Weise werden Toleranzen ausgeglichen und die Nominalspannung angehoben. Zum schnellen Aufheizen werden die Niederspannungsglühstiftkerzen für kurze Zeit mit etwa bis zu 11 V betrieben. Durch diesen Vorgang, ist es möglich, dass die Niederspannungsglühstiftkerze in etwa 2 sec auf 1000 °C aufheizt. Anschließend muss die Spannung so appliziert werden, dass die gewünschte Temperatur gehalten wird und gleichzeitig die Glühstiftkerze nicht überhitzt. Nachteilig bei diesem schnellen Aufheizbetrieb ist, dass während dieses Vorgangs im Inneren der Glühstiftkerze sehr hohe Temperaturen auftreten. Die entstehende Wärme kann nicht schnell genug nach außen zur Glührohroberfläche geleitet werden.If a voltage is applied to the glow plug, initially a high current flows, which primarily heats up the area of the heating coil due to the distribution of 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. By the control coil, therefore, 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. For quick heating, 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. Then the voltage must be applied so that the desired temperature is maintained and at the same time the glow plug does not overheat. The disadvantage of this rapid heating operation is that very high temperatures occur during this process inside the glow plug. The resulting heat can not be conducted quickly enough to the outside of the glow tube surface.
Auf diese Weise kommt es während des Aufheizvorganges zu einer inneren Temperaturerhöhung, deren Spitzen nur noch 100 bis 200 °C unterhalb der Schmelztemperatur des Materials der Heizwendel liegen. Diese massive Temperaturerhöhung beim Aufheizvorgang kann aufgrund unsorgfältiger Applikation oder durch fehlerhafter Steuerungskomponenten dazu führen, dass der Schmelzpunkt des Glührohres, der unterhalb des Schmelzpunktes der Materialien der Heiz- oder Regelwendel der Heizeinrichtung liegt, erreicht bzw. überschritten wird. Dadurch schmilzt das Glührohr bevor die Glühstiftkerze an der Heizwendel und/oder Regelwendel durchbrennt. Infolge dessen können Materialteile des Glührohres der Glühstiftkerze in den Brennraum gelangen und die Brennkraftmaschine schädigen.In this way, it comes during the heating process to an internal temperature increase, 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.
Aufgabe der vorliegenden Erfindung ist es, ein Sicherungssystem in den Stromkreis der Glühstiftkerze einzubauen, das ein Schmelzen des Glührohr der Glühstiftkerze unterbindet, um so einen Motorschaden zu verhindern, so dass nur die preisgünstige Glühstiftkerze ausgetauscht werden muss.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.
Die Aufgabe der Erfindung wird mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Die Schmelzsicherung mit einer Schmelztemperatur unterhalb der Schmelztemperatur des Glührohres verhindert, dass das Glührohr schmilzt. Die Schmelzsicherung ist dabei an mindestens einer Stelle im Stromkreis an einem eine Heizeinrichtung bildenden elektrischen Widerstandselement ausgebildet.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.
Vorteilhafte Weiterbildungen der Erfindung sind durch die Maßnahmen der Unteransprüche möglich. Besonders vorteilhaft ist es, an mindestens einer Stelle der Heiz- und/oder Regelwendel eine Verbindungsstelle zu schaffen, die als Schmelzsicherung wirkt. Dabei ist es zweckmäßig, die Verbindungsstelle beispielsweise mittels eines Hartlot-Werkstoffs zu erzeugen und den Schmelzpunkt der Schmelzsicherung durch die Wahl des Hartlot-Werkstoffes einzustellen. Überschreitet die Temperatur im Innern des Glührohres den Schmelzpunkt des Hartlot-Werkstoffs, schmilzt die Lotverbindung und der Stromkreis wird unterbrochen. Dabei kriecht das Lot in die Restporösität des keramischen Isolierpulvers. Der Vorgang ist dann nicht reversibel. Die Lotverbindung kann zwischen Heiz- und Regelwendel liegen. Es ist aber ebenso möglich, die Heizwendel und/oder die Regelwendel an einer geeigneten Stelle zu trennen und mit der Lotverbindung zu versehen, die die Schmelzsicherung ausbildet. Da die Temperatur im Heizwendelbereich je nach Ort unterschiedlich ist, kann auch durch die Wahl des Ortes der Lotverbindung eine Temperatureinstellung erfolgen.Advantageous developments of the invention are possible by the measures of the subclaims. To provide at least one point of the heating and / or control coil a 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 Heizwendelbereich varies depending on the location, a temperature adjustment can also be made by the choice of the location of the solder joint.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert.An embodiment of the invention is illustrated in the drawing and explained in more detail in the following description.
Es zeigen:
- Figur 1
- einen brennraumseitigen Abschnitt einer Glühstiftkerze und
- Figur 2
- eine Verbindungsstelle zwischen einem ersten Wendelabschnitt und einem zweiten Wendelabschnitt eines elektrischen Widerstandselements.
- FIG. 1
- a combustion chamber side portion of a glow plug and
- FIG. 2
- a junction between a first coil portion and a second coil portion of an electrical resistance element.
Die in
Das dargestellte Widerstandselement 17 besteht aus zwei in Reihe geschalteten Widerstandswendeln, wobei die brennraumseitige Widerstandswendel eine Heizwendel 21 und die brennraumferne Widerstandswendel eine Regelwendel 22 bildet. Die Wirkung der Heizwendel 21 und der Regelwendel 22 wurde bereits eingangs im Zusammenhang mit der Würdigung des Standes der Technik erläutert.The illustrated
Das Glührohr 14 besteht beispielsweise aus einer Nickellegierung mit einer chemischen Zusammensetzung NiCr23Fe oder NiCr25FeAlY, die auch unter der Werkstoffnummer 2.4851 oder 2.4633 bekannt sind. Die Schmelztemperatur dieser Materialien liegt beispielsweise bei etwa 1400 °C.The
Wichtig für die Ausbildung der Verbindungsstelle 30 ist, dass ein Abstand zwischen den Widerstandswendelabschnitten 31 und 32 vorliegt, so dass eine Lotzone zwischen den beiden Drahtenden entsteht. Der Abstand zwischen den Widerstandswendelabschnitten 31 und 32 ist zweckmäßigerweise mit 0,1 bis 1mm gewählt. Wenn bei einer Überhitzung das Lot schmilzt, diffundiert der Lotwerkstoff in die Poren der Füllung mit dem keramischen Isolierpulver 18. Nach dem Schmelzen muss ein Abstand zwischen den Heizwendelabschnitten 31, 32 verbleiben, damit der Stromkreis unterbrochen bleibt. Der Abstand ist außerdem nicht zu groß zu wählen, damit der Lotwerkstoff vom umgebenden Isolierpulver 18 aufgenommen werden kann. Aus dem gleichen Grund sollte die Lotzone mit möglichst wenig Lotwerkstoff ausgeführt werden.Important for the formation of the
Ein zweckmäßiger Ort zur Ausbildung der Verbindungsstelle 30 ist die Verbindung zwischen Heizwendel 21 und Regelwendel 22 gemäß
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810015598 DE102008015598A1 (en) | 2008-03-26 | 2008-03-26 | glow plug |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2105670A2 true EP2105670A2 (en) | 2009-09-30 |
EP2105670A3 EP2105670A3 (en) | 2017-11-22 |
Family
ID=40823400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09100081.0A Withdrawn EP2105670A3 (en) | 2008-03-26 | 2009-01-28 | Glow plug |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2105670A3 (en) |
DE (1) | DE102008015598A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011118724A1 (en) | 2011-11-16 | 2013-05-16 | Volkswagen Aktiengesellschaft | Apparatus for supplying power to glow plug for vehicle, has fuses that are designed to interrupt power supply to glow plug, when temperature of fuse is above predetermined temperature threshold |
WO2014206671A1 (en) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Sheathed-element glow plug and method for the production thereof |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10157466A1 (en) | 2001-10-23 | 2003-04-30 | Bosch Gmbh Robert | Electrically heated glow plug and method for producing an electrically heated glow plug |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3915224A1 (en) * | 1989-05-10 | 1990-11-15 | Bosch Gmbh Robert | GLOW PLUG CANDLE |
JPH0814376B2 (en) * | 1989-09-11 | 1996-02-14 | 自動車機器株式会社 | Self temperature control glow plug |
JP2570481Y2 (en) * | 1991-05-30 | 1998-05-06 | 自動車機器株式会社 | Self-temperature control glow plug |
DE4301252A1 (en) * | 1993-01-19 | 1994-07-21 | Beru Werk Ruprecht Gmbh Co A | Pole flame glow plug |
-
2008
- 2008-03-26 DE DE200810015598 patent/DE102008015598A1/en not_active Withdrawn
-
2009
- 2009-01-28 EP EP09100081.0A patent/EP2105670A3/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10157466A1 (en) | 2001-10-23 | 2003-04-30 | Bosch Gmbh Robert | Electrically heated glow plug and method for producing an electrically heated glow plug |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011118724A1 (en) | 2011-11-16 | 2013-05-16 | Volkswagen Aktiengesellschaft | Apparatus for supplying power to glow plug for vehicle, has fuses that are designed to interrupt power supply to glow plug, when temperature of fuse is above predetermined temperature threshold |
DE102011118724B4 (en) * | 2011-11-16 | 2015-09-03 | Volkswagen Aktiengesellschaft | Device and system for supplying power to glow plugs for a vehicle |
WO2014206671A1 (en) * | 2013-06-26 | 2014-12-31 | Robert Bosch Gmbh | Sheathed-element glow plug and method for the production thereof |
Also Published As
Publication number | Publication date |
---|---|
EP2105670A3 (en) | 2017-11-22 |
DE102008015598A1 (en) | 2009-10-01 |
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