EP1034400B1 - Sheathed-element glow plug for internal combustion engines - Google Patents

Sheathed-element glow plug for internal combustion engines Download PDF

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Publication number
EP1034400B1
EP1034400B1 EP98966162A EP98966162A EP1034400B1 EP 1034400 B1 EP1034400 B1 EP 1034400B1 EP 98966162 A EP98966162 A EP 98966162A EP 98966162 A EP98966162 A EP 98966162A EP 1034400 B1 EP1034400 B1 EP 1034400B1
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EP
European Patent Office
Prior art keywords
glow plug
glow
sheathed
combustion
coil
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.)
Revoked
Application number
EP98966162A
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German (de)
French (fr)
Other versions
EP1034400A1 (en
Inventor
Ulrich Kawa
Werner Teschner
Jochen Neumeister
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
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1034400A1 publication Critical patent/EP1034400A1/en
Application granted granted Critical
Publication of EP1034400B1 publication Critical patent/EP1034400B1/en
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • F02P19/021—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 characterised by power delivery controls
    • 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
    • F02P19/021—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 characterised by power delivery controls
    • F02P19/022—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 characterised by power delivery controls using intermittent current supply

Definitions

  • the invention relates to a glow plug for arrangement in Combustion chamber of air compressing internal combustion engines after the Genus of the main claim, as already from DE-C 28 02 625 or EP-A-0 785 396 is known.
  • This known glow plug has one Glow plug on, in which an in an insulating material embedded electrical resistance element that is made up of puts together two resistance coils connected in series, is arranged.
  • the resistance coil on the combustion chamber side Resistance element has an essentially temperature-independent Resistance and serves as a heating element, while the resistance coil remote from the combustion chamber has a high positive Has temperature resistance coefficient and as Control element works.
  • the functioning of such a self-regulating Glow plug is already detailed in the beginning cited prior art explained, so that here should be dispensed with.
  • the resistance of the control coil at the beginning of the heating process is low and so a high current through the heating coil flows.
  • the glow plug heats up, it increases Resistance of the control coil and the heating power of the heating coil decreases. This prevents the glow plug from overheating protected.
  • the glow plug according to the invention with the characteristic Features of the main claim has the advantage that by shortening of the control coil portion the resistance of the control coil is reduced and thus the heating-up time until it is reached the start temperature is reduced. At long last the glow plug according to the invention also has the known one Self-protection function with the control effect at the same time significantly reduced heating-up time.
  • the clocking the current through the resistance element after reaching the Start temperature has the advantage that the permissible maximum temperature is not exceeded, increasing the lifespan the glow plug is significantly increased.
  • the entire Resistance coil in the glass pen be arranged so that they is not in the housing of the glow plug. It is targeted just heating up the glow plug and direct Heat dissipation to the combustion chamber ensures what the losses, when there is unnecessary heating of the metal housing would arise, makes it negligible.
  • FIG. 1 shows a longitudinal section through the region of a glow plug on the combustion chamber side
  • FIG. 3 shows a time-temperature diagram for illustration the temperature profiles of the glow plugs.
  • the glow plug shown in Figure 1 has a tubular Metal housing 11, in its longitudinal bore 12 Glow plug 13 sealed with part of its length is.
  • This glow plug 13 has a corrosion-resistant, thin-walled glow tube 14, which on its combustion chamber side End is closed.
  • a resistance element 15 Extends inside the glow tube 14 a resistance element 15 in the axial direction.
  • the resistance element 15 is embedded in insulating material 16 and distant from the combustion chamber with a connecting part 17 for the provided electrical current.
  • the resistance element 15 is on the combustion chamber side, electrically conductive with the bottom of the Glow tube 14 connected.
  • the resistance element shown 15 consists of a heating coil 20, which is arranged on the combustion chamber side is.
  • a control coil 21 is provided far from the combustion chamber, which have a high positive temperature resistance coefficient having.
  • FIG 2 shows again in longitudinal section the glow plug 13, wherein It can be clearly seen here that the control coil 21 in the Relationship to the execution in Figure 1 is shortened. There are fewer helical gears are provided here, so that the entire control helix in the glow plug part that is not from the housing 11 is enclosed.
  • FIG 3 shows the temperature behavior of the individual glow plugs over time.
  • curve 30 is the temperature curve a conventional glow plug, as in Figure 1 is shown.
  • This glow plug reached after about four seconds the temperature of 850 ° C and has a maximum temperature of 1100 ° C, which it after about Has reached 10 sec.
  • About the control behavior of the glow plug the temperature is then reduced to approx. 1000 ° C.
  • curve 31 shows the glow plug with a shortened control coil, as shown in Figure 2 is. Because of the much lower resistance the control coil achieves a significantly shorter heating-up time.
  • the 850 ° C in this new invention Arrangement already reached after about 21 ⁇ 2 seconds.
  • This Glow plug as shown in Figure 2, reached a maximum temperature of about 1200 ° C before the control behavior the glow plug responds.
  • Around the glow plug with the shortened control coil in front of one is the flow of electricity through the glow plug after reaching the necessary start temperature in the exemplary embodiment this is not 1050 ° C. due to this shown control unit clocked.
  • the clocking of the current a glow plug is already known from US-C-4,391,237 and should not be explained again.
  • the temperature curve a clocked glow plug according to the invention according to Figure 2 is shown with the curve 32.
  • connection of a glow plug with a shortened control coil and the clocking of the control device has the advantage that on the one hand the heating up time and thus the preheating time for the Engine is significantly shortened while protecting the Glow plug is guaranteed before overheating.

Description

Stand der TechnikState of the art

Die Erfindung betrifft eine Glühstiftkerze zur Anordnung im Brennraum luftverdichtender Brennkraftmaschinen nach der Gattung des Hauptanspruchs, wie sie bereits aus der DE-C 28 02 625 oder EP-A-0 785 396 bekannt ist. Diese bekannte Glühstiftkerze weist einen Glühstift auf, in welchem ein in ein Isoliermaterial eingebettetes elektrisches Widerstandselement, das sich aus zwei in Reihe verbundenen Widerstandswendeln zusammensetzt, angeordnet ist. Die brennraumseitige Widerstandswendel dieses Widerstandselementes besitzt einen im wesentlichen temperaturunabhängigen Widerstand und dient als Heizelement, während die brennraumferne Widerstandswendel einen hohen positiven Temperatur-Widerstandskoeffizienten aufweist und als Regelelement wirkt. Die Funktionsweise einer solchen selbstregelnden Glühstiftkerze ist bereits ausführlich im eingangs zitierten Stand der Technik erläutert, so daß hier darauf verzichtet werden soll. Zusammenfassend läßt sich jedoch sagen, der Widerstand der Regelwendel bei Beginn des Heizvorganges niedrig ist und so ein hoher Strom durch die Heizwendel fließt. Mit dem Erwärmen der Glühstiftkerze steigt der Widerstand der Regelwendel und die Heizleistung der Heizwendel nimmt ab. Damit ist die Glühstiftkerze vor Überhitzung geschützt. The invention relates to a glow plug for arrangement in Combustion chamber of air compressing internal combustion engines after the Genus of the main claim, as already from DE-C 28 02 625 or EP-A-0 785 396 is known. This known glow plug has one Glow plug on, in which an in an insulating material embedded electrical resistance element that is made up of puts together two resistance coils connected in series, is arranged. The resistance coil on the combustion chamber side Resistance element has an essentially temperature-independent Resistance and serves as a heating element, while the resistance coil remote from the combustion chamber has a high positive Has temperature resistance coefficient and as Control element works. The functioning of such a self-regulating Glow plug is already detailed in the beginning cited prior art explained, so that here should be dispensed with. In summary, however, it can be said the resistance of the control coil at the beginning of the heating process is low and so a high current through the heating coil flows. As the glow plug heats up, it increases Resistance of the control coil and the heating power of the heating coil decreases. This prevents the glow plug from overheating protected.

Vorteile der ErfindungAdvantages of the invention

Die erfindungsgemäße Glühstiftkerze mit den kennzeichnenden Merkmalen des Hauptanspruchs hat den Vorteil, daß durch Verkürzung des Regelwendelanteils der Widerstand der Regelwendel verkleinert wird und somit die Aufheizzeit bis zum Erreichen der Starttemperatur verringert wird. Letztendlich hat die erfindungsgemäße Glühstiftkerze weiterhin die bekannte Selbstschutzfunktion durch die Regelwirkung mit gleichzeitig deutlich verringerter Aufheizzeit. Das Takten des Stromes durch das Widerstandselement nach Erreichen der Starttemperatur hat den Vorteil, daß die zulässige Maximaltemperatur nicht überschritten wird, wodurch die Lebensdauer der Glühstiftkerze deutlich erhöht wird.The glow plug according to the invention with the characteristic Features of the main claim has the advantage that by shortening of the control coil portion the resistance of the control coil is reduced and thus the heating-up time until it is reached the start temperature is reduced. At long last the glow plug according to the invention also has the known one Self-protection function with the control effect at the same time significantly reduced heating-up time. The clocking the current through the resistance element after reaching the Start temperature has the advantage that the permissible maximum temperature is not exceeded, increasing the lifespan the glow plug is significantly increased.

Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen der im Hauptanspruch angegebenen Glühstiftkerze möglich. Vorteilhafterweise kann bei einer verkürzten Regelwendel die gesamte Widerstandswendel im Glüstift so angeordnet sein, daß sie nicht im Gehäuse der Glühstiftkerze liegt. Damit wird gezielt nur eine Aufheizung des Glühstiftes und eine direkte Wärmeabgabe an den Brennraum sichergestellt, was die Verluste, die bei einem unnötigen Aufheizen des Metallgehäuses entstehen würden, vernachlässigbar macht.By the measures listed in the subclaims advantageous developments and improvements in Main claim specified glow plug possible. Advantageously the entire Resistance coil in the glass pen be arranged so that they is not in the housing of the glow plug. It is targeted just heating up the glow plug and direct Heat dissipation to the combustion chamber ensures what the losses, when there is unnecessary heating of the metal housing would arise, makes it negligible.

Zeichnungdrawing

Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 einen Längsschnitt durch den brennraumseitigen Bereich einer Glühstiftkerze, Figur 2 einen weiteren Längsschnitt durch den brennraumseitigen Glühstift und Figur 3 ein Zeit-Temperatur-Diagramm zum Darstellen der Temperaturverläufe der Glühstiftkerzen.Embodiments of the invention are in the drawing shown and explained in more detail in the following description. 1 shows a longitudinal section through the region of a glow plug on the combustion chamber side, FIG another longitudinal section through the glow plug on the combustion chamber side and FIG. 3 shows a time-temperature diagram for illustration the temperature profiles of the glow plugs.

Beschreibung der AusführungsbeispieleDescription of the embodiments

Die in Figur 1 dargestellte Glühstiftkerze besitzt ein rohrförmiges Metallgehäuse 11, in dessen Längsbohrung 12 ein Glühstift 13 mit einem Teil seiner Länge abdichtend festgelegt ist. Dieser Glühstift 13 hat ein korrosionsbeständiges, dünnwandiges Glührohr 14, welches an seinem brennraumseitigen Ende verschlossen ist. Im Inneren des Glührohres 14 erstreckt sich ein Widerstandselement 15 in axialer Richtung. Das Widerstandselement 15 ist in Isoliermaterial 16 eingebettet und brennraumfern mit einem Anschlußteil 17 für den elektrischen Strom versehen. Das Widerstandselement 15 ist brennraumseits elektrisch leitend fest mit dem Boden des Glührohres 14 verbunden. Das dargestellte Widerstandselement 15 besteht aus einer Heizwendel 20, die brennraumseits angeordnet ist. Brennraumfern ist eine Regelwendel 21 vorgesehen, die einen hohen positiven Temperatur-Widerstandskoeffizienten aufweist.The glow plug shown in Figure 1 has a tubular Metal housing 11, in its longitudinal bore 12 Glow plug 13 sealed with part of its length is. This glow plug 13 has a corrosion-resistant, thin-walled glow tube 14, which on its combustion chamber side End is closed. Extends inside the glow tube 14 a resistance element 15 in the axial direction. The resistance element 15 is embedded in insulating material 16 and distant from the combustion chamber with a connecting part 17 for the provided electrical current. The resistance element 15 is on the combustion chamber side, electrically conductive with the bottom of the Glow tube 14 connected. The resistance element shown 15 consists of a heating coil 20, which is arranged on the combustion chamber side is. A control coil 21 is provided far from the combustion chamber, which have a high positive temperature resistance coefficient having.

Figur 2 zeigt noch mal im Längsschnitt den Glühstift 13, wobei hier deutlich zu erkennen ist, daß die Regelwendel 21 im Verhältnis zur Ausführung in Figur 1 verkürzt ist. Es sind hier weniger Wendelgänge vorgesehen, so daß die gesamte Regelwendel in dem Glühstiftteil liegt, der nicht vom Gehäuse 11 umschlossen ist. Figure 2 shows again in longitudinal section the glow plug 13, wherein It can be clearly seen here that the control coil 21 in the Relationship to the execution in Figure 1 is shortened. There are fewer helical gears are provided here, so that the entire control helix in the glow plug part that is not from the housing 11 is enclosed.

Figur 3 zeigt das Temperaturverhalten der einzelnen Glühstiftkerzen über die Zeit. Mit Kurve 30 ist der Temperaturverlauf einer herkömmlichen Glühstiftkerze, wie sie auch in Figur 1 dargestellt ist, gezeigt. Diese Glühstiftkerze erreicht nach ca. vier Sekunden die Temperatur von 850 °C und hat eine Maximaltemperatur von 1100 °C, welche sie nach etwa 10 sec. erreicht hat. Über das Regelverhalten der Glühstiftkerze wird dann die Temperatur zurückgeregelt auf ca. 1000 °C. Im Vergleich dazu zeigt Kurve 31 die Glühstiftkerze mit einer verkürzten Regelwendel, wie sie in Figur 2 dargestellt ist. Aufgrund des wesentlich geringeren Widerstandes der Regelwendel wird eine wesentlich kürzere Aufheizzeit erreicht. Die 850°C sind bei dieser neuen erfindungsgemäßen Anordnung bereits nach etwa 2 ½ Sekunden erreicht. Diese Glühstiftkerze, wie sie in Figur 2 dargestellt ist, erreicht eine Maximaltemperatur von etwa 1200 °C bevor das Regelverhalten der Glühstiftkerze anspricht. Damit liegt die Maximaltemperatur der erfindungsgemäßen Glühstiftkerze ca. 150 °C höher als bei den bisher verwendeten Glühstiftkerzen. Um die Glühstiftkerze mit der verkürzten Regelwendel vor einer Überhitzung zu schützen wird der Stromfluß durch die Glühstifkerze nach dem Erreichen der notwendigen Starttemperatur im Ausführungsbeispiel sind das 1050 °C durch das hier nicht dargestellte Steuergerät getaktet. Das Takten des Stromes einer Glühstiftkerze ist bereits aus der US-C-4 391 237 bekannt und soll nicht nochmal erläutert werden. Der Temperaturverlauf einer getakteten erfindungsgemäßen Glühstiftkerze nach Bild 2 ist mit dem Kurvenverlauf 32 dargestellt.Figure 3 shows the temperature behavior of the individual glow plugs over time. With curve 30 is the temperature curve a conventional glow plug, as in Figure 1 is shown. This glow plug reached after about four seconds the temperature of 850 ° C and has a maximum temperature of 1100 ° C, which it after about Has reached 10 sec. About the control behavior of the glow plug the temperature is then reduced to approx. 1000 ° C. In comparison, curve 31 shows the glow plug with a shortened control coil, as shown in Figure 2 is. Because of the much lower resistance the control coil achieves a significantly shorter heating-up time. The 850 ° C in this new invention Arrangement already reached after about 2½ seconds. This Glow plug, as shown in Figure 2, reached a maximum temperature of about 1200 ° C before the control behavior the glow plug responds. This is the maximum temperature 150 of the glow plug according to the invention ° C higher than with the glow plugs previously used. Around the glow plug with the shortened control coil in front of one To protect against overheating is the flow of electricity through the glow plug after reaching the necessary start temperature in the exemplary embodiment this is not 1050 ° C. due to this shown control unit clocked. The clocking of the current a glow plug is already known from US-C-4,391,237 and should not be explained again. The temperature curve a clocked glow plug according to the invention according to Figure 2 is shown with the curve 32.

Die Verbindung einer Glühstiftkerze mit verkürzter Regelwendel und dem Takten des Steuergerätes hat den Vorteil, daß zum einen die Aufheizzeit und damit die Vorglühzeit für den Motor deutlich verkürzt wird und gleichzeitig ein Schutz der Glühstiftkerze vor Überhitzung gewährleistet ist.The connection of a glow plug with a shortened control coil and the clocking of the control device has the advantage that on the one hand the heating up time and thus the preheating time for the Engine is significantly shortened while protecting the Glow plug is guaranteed before overheating.

Claims (3)

  1. Sheathed-element glow plug for arrangement in the combustion chamber of compression-ignition internal combustion engines, having a tubular metal housing (11), in the longitudinal hole (12) of which a glow element (13) is fixed in a sealing manner over part of its length, the glow element (13) having a thin-walled glow tube (14), which is closed by a bottom at its combustion-chamber end and arranged in the interior of which is a resistor element (15), which extends in the axial direction and comprises a heating coil (20) arranged at the combustion-chamber end and a regulating coil (21) arranged remote from the combustion chamber, the regulating coil (21) remote from the combustion chamber being provided with a connection part for the electric current and the heating coil (20) at the combustion-chamber end being connected in an electrically conductive manner to the bottom of the glow tube (14), characterized in that the resistance of the regulating coil (21) is about 100 to 150 mΩ at room temperature and the current is pulsed through the sheathed-element glow plug.
  2. Sheathed-element glow plug according to Claim 1, characterized in that the resistor element (15) extending in the axial direction is situated in the part of the glow element (13) that is not surrounded by the longitudinal hole of the metal housing (11).
  3. Sheathed-element glow plug according to Claim 1 and 2, characterized in that the current through the resistor element (15) is pulsed once the starting temperature has been reached.
EP98966162A 1997-11-25 1998-11-23 Sheathed-element glow plug for internal combustion engines Revoked EP1034400B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19752099A DE19752099C1 (en) 1997-11-25 1997-11-25 Glow plug for diesel engine ignition, facilitation
DE19752099 1997-11-25
PCT/DE1998/003450 WO1999027302A1 (en) 1997-11-25 1998-11-23 Sheathed-element glow plug for internal combustion engines

Publications (2)

Publication Number Publication Date
EP1034400A1 EP1034400A1 (en) 2000-09-13
EP1034400B1 true EP1034400B1 (en) 2001-09-26

Family

ID=7849710

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966162A Revoked EP1034400B1 (en) 1997-11-25 1998-11-23 Sheathed-element glow plug for internal combustion engines

Country Status (4)

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EP (1) EP1034400B1 (en)
JP (1) JP2001524655A (en)
DE (2) DE19752099C1 (en)
WO (1) WO1999027302A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10248802A1 (en) 2002-10-19 2004-04-29 Robert Bosch Gmbh Glow plug with greatly shortened control coil
JP4695536B2 (en) * 2006-03-29 2011-06-08 日本特殊陶業株式会社 Glow plug
JP5584370B2 (en) * 2012-04-16 2014-09-03 日本特殊陶業株式会社 Glow plug
DE102013217703A1 (en) 2013-09-05 2015-03-05 Robert Bosch Gmbh Electric heater with overtemperature protection body

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2802625C3 (en) * 1978-01-21 1985-07-18 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Glow plug
JPS56126674A (en) * 1980-03-12 1981-10-03 Diesel Kiki Co Ltd Auxiliary stater of diesel engine
US4423309A (en) * 1982-06-28 1983-12-27 General Motors Corporation Quick heat self regulating electric glow heater
DE9005085U1 (en) * 1990-05-04 1990-08-09 Beru Ruprecht Gmbh & Co Kg, 7140 Ludwigsburg, De
JP2570481Y2 (en) * 1991-05-30 1998-05-06 自動車機器株式会社 Self-temperature control glow plug
JP3802599B2 (en) * 1995-12-28 2006-07-26 日本特殊陶業株式会社 Electrically heated sheathed heater and self-temperature control type glow plug

Also Published As

Publication number Publication date
JP2001524655A (en) 2001-12-04
DE19752099C1 (en) 1998-10-22
EP1034400A1 (en) 2000-09-13
WO1999027302A1 (en) 1999-06-03
DE59801594D1 (en) 2001-10-31

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