EP0456245B1 - Zündeinrichtung für ein brennstoffbetriebenes Heizgerät - Google Patents

Zündeinrichtung für ein brennstoffbetriebenes Heizgerät Download PDF

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Publication number
EP0456245B1
EP0456245B1 EP91107574A EP91107574A EP0456245B1 EP 0456245 B1 EP0456245 B1 EP 0456245B1 EP 91107574 A EP91107574 A EP 91107574A EP 91107574 A EP91107574 A EP 91107574A EP 0456245 B1 EP0456245 B1 EP 0456245B1
Authority
EP
European Patent Office
Prior art keywords
ignition system
glow
flame
heater
ignition device
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.)
Expired - Lifetime
Application number
EP91107574A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0456245A3 (en
EP0456245A2 (de
Inventor
Thomas Ganz
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.)
Webasto SE
Original Assignee
Webasto SE
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 Webasto SE filed Critical Webasto SE
Publication of EP0456245A2 publication Critical patent/EP0456245A2/de
Publication of EP0456245A3 publication Critical patent/EP0456245A3/de
Application granted granted Critical
Publication of EP0456245B1 publication Critical patent/EP0456245B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D3/00—Burners using capillary action
    • F23D3/40—Burners using capillary action the capillary action taking place in one or more rigid porous bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/14—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors
    • F23N5/143—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermo-sensitive resistors using electronic means
    • 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
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/38—Electrical resistance ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors

Definitions

  • the invention relates to an ignition device for a fuel-operated auxiliary vehicle heater according to the preamble of patent claim 1
  • a rod glow plug is provided as the ignition device for a fuel-operated heating device, in which the glow rod serving as the glow electrode also forms an ionization electrode, which is used for flame monitoring.
  • a protective tube is provided in the case of a glow plug, which forms the ionization electrode. If the rod glow plug is used for flame monitoring using the ionization principle, additional devices must be provided on the rod glow plug, which act as an ionization electrode for flame monitoring. Therefore, the usual design of a glow plug must be changed and a glow plug especially suitable for ionization flame monitoring must be manufactured.
  • a glow plug for internal combustion engines which is designed as a rod glow plug.
  • This glow plug has a ceramic carrier on which a heating element similar to a conductor track is applied.
  • the embodiment of a glow plug described there is also suitable for arranging an overheating protection (PTC resistor) and / or a voltage limiter (varistor) in the connecting leads of the heating element. There is no flame monitoring.
  • a flame detector as a flame detector device, which protrudes into the combustion chamber of the heater.
  • Such flame monitors not only interfere with the flame formation in the combustion chamber, but are also very sensitive to faults, since they must always be in the flame zone during combustion.
  • DE-A-28 02 625 and 26 41 274 are glow ignition devices specified, in which PTC resistors are used as protection against overheating, the operating state in the second-mentioned publication being able to be detected via the optical glow pattern in a filament ignition device with a PTC resistor.
  • the invention has for its object to provide an ignition device for a fuel-operated heater of the generic type, by means of which energy-saving ignition and reliable flame monitoring is made possible without an additional flame detector component.
  • an ignition device for a fuel-operated auxiliary vehicle heater is distinguished on the one hand by the fact that the glow element has a PTC behavior, so that its resistance to flame formation is additionally increased.
  • the PTC behavior of the glow element such as a tungsten glow element, is thus used to carry out flame monitoring during the glow process and also later.
  • the resistance increases with the temperature of the material.
  • This temperature range is in the invention Ignition device selected so that when a flame forms in the combustion chamber of the heating device, the resistance of the glow element to the glow process of the ignition device increases and a steep increase in the resistance of the glow element is recorded.
  • Tungsten has proven to be the preferred material for the glow element, which has a PTC behavior if a rod glow plug is provided as the ignition device.
  • the flame monitoring can take place without additional measures on the glow plug or an additional component, such as a flame monitor, so that the flame formation in the combustion chamber is not disturbed by additional components protruding into the combustion chamber.
  • there is also no component in a burner of a fuel-operated heating device which simplifies the manufacture of the same and can shorten the burner dimensions of the heating device.
  • a constant current is applied to the glow element in order to detect the voltage drop due to the additional increase in resistance that occurs during flame formation.
  • a circuit can be used for flame monitoring, for example, because when a flame is formed due to the increased temperature on the glow element, the resistance of the glow element suddenly increases and a voltage drop occurs when a constant current is applied, which is then used for evaluation by a control device of the heater via appropriate signal processing devices can be used to trigger appropriate switching operations when a flame has formed in the combustion chamber of the heater.
  • This constant current is applied in the glow pauses of the ignition device, which is obtained, for example, when the glow ignition device is controlled by means of a glow contact relay. Therefore, in the design according to the invention the ignition device essentially only to take circuitry measures with regard to the implementation of flame monitoring, which can be integrated into the control device of the heater. This reduces the amount of components involved in the manufacture of such a heater.
  • the ignition device is designed such that when an additional resistance increase of the glow element occurs, i.e. during flame monitoring by means of the ignition device, a shutdown of the glow operation of the glow ignition device is triggered, since a flame is now present in the combustion chamber for starting the burner operation of the heater.
  • the ignition device can also be switched off automatically by utilizing the PTC behavior of the glow element.
  • the design of the ignition device according to the invention also permits constant monitoring of the combustion operation if the current signal to the ignition device is applied in a constant or clocked manner, so that continuous flame monitoring can also be carried out while the heater is in operation.
  • the current signal can preferably be significantly smaller than that required for the actual glow operation.
  • the flame monitoring can thus be used both in the glow phase of the glow ignition device, if it is used for its intended purpose as an ignition device, and in the combustion mode, so that the combustion behavior can be detected and monitored by means of appropriate evaluations.
  • the energy supplied to the ignition device can be reduced if the ignition device is heated by the flame formation and therefore the electrical energy requirement for keeping the temperature of the ignition device constant is lower.
  • the respective sizes are component-specific.
  • the ignition device is switched off when the decrease in energy consumption determined on the basis of the PTC behavior of the glow element falls below a predetermined preset value.
  • a stick glow plug can be used as the ignition device, which has a glow element, such as a filament, embedded in a ceramic mass. Tungsten, which has a pronounced PTC behavior, is particularly suitable as the material for the glow element or the filament.
  • the burner is formed by an evaporation burner 1, which has an absorbent body 2, such as a fleece, on a carrier, which is arranged in a combustion tube 3, which delimits a combustion chamber 4.
  • Liquid fuel is supplied to the evaporative burner 1 via a fuel feed line 5.
  • a rod glow plug 7 is provided as an ignition device designated overall by 6, which goes through the carrier and the absorbent body 2 of the vaporization burner 1 and projects into the combustion chamber 4.
  • the rod glow plug 7 has, for example, a filament 8 as the glow element, which is preferably made of tungsten and which is embedded in a ceramic mass 9.
  • the glow plug 7 is operated in the glow phase by means of a glow clock relay or transistor in such a way that the glow element 8 embedded in the ceramic mass 9, like the filament, serves as a glow element, so that the glow plug 7 is connected to an air / fuel prepared for the ignition of the evaporative burner 1 Mixture is heated to suitable temperature.
  • This suitable temperature or target temperature is approximately in the order of 1100 ° C.
  • a constant current I is applied to the glow element 8 of the glow plug 7 during the glow pauses, ie the clock breaks of a glow clock relay 10. If a flame has formed in the combustion chamber 4, the rod glow plug 7 and thus the glow element or the filament 8 thereof are additionally heated by the flame temperature, and due to the PTC behavior of the glow element 8, their resistance increases additionally.
  • This additional increase in resistance creates a voltage drop in the line section with constant current, which is used for flame monitoring.
  • This voltage drop can then be used via an evaluation device (not shown) in order to trigger corresponding switching operations via a control device (not shown) of the heater. Even if this voltage drop does not occur and therefore no flame has formed in the combustion chamber 4, corresponding switching operations can be triggered as in the case of a conventional additional flame monitor.
  • a control circuit 11 of the glow plug 7 in the example shown can be designed so that in the event of flame detection and a steep increase in the resistance of the glow element or the filament 8 of the glow plug due to the PTC behavior, the glow operation of the glow plug 7 can be stopped by others To save energy for heating the glow element 8, since the ignition device 6 has already ignited the fuel mixture prepared on the evaporation burner 1. Even if the glow plug 7 is then switched off, the flame monitoring, based on the PTC behavior of the glow element 8, can also be continued during the firing operation of the heater, in which the current signal to be applied to the glow plug 7 is maintained continuously or in a clocked manner. Thus, the flame formation in the combustion chamber 4 can also be detected during the combustion operation via the control circuit and a downstream evaluation device.
  • FIG. 2 As an essential difference from FIG. 1, an ignition device 6 is shown, which has an open glow element, such as an incandescent filament 8 ', which is not embedded in a ceramic mass, but is exposed in the combustion chamber 4.
  • an open glow element such as an incandescent filament 8 '
  • the control functions explained above are also carried out here.
  • the electrical energy to be kept constant at the ignition device 6 can also be changed and controlled if the change in resistance of the glow element or the filament 8 'is evaluated in a corresponding manner due to the PTC behavior.
  • a corresponding control can of course also be carried out in the embodiment shown in FIG.
  • the invention is not limited to the example shown.
  • a burner design other than the evaporation burner 1 shown can also be used in such a heater.
  • the glow element need not be designed in the form of an incandescent filament 8, 8 ', but the glow element can have any shape that is suitable for the respective application, such as band-shaped, serpentine or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
EP91107574A 1990-05-11 1991-05-10 Zündeinrichtung für ein brennstoffbetriebenes Heizgerät Expired - Lifetime EP0456245B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4015097 1990-05-11
DE4015097A DE4015097C1 (enrdf_load_stackoverflow) 1990-05-11 1990-05-11

Publications (3)

Publication Number Publication Date
EP0456245A2 EP0456245A2 (de) 1991-11-13
EP0456245A3 EP0456245A3 (en) 1992-02-19
EP0456245B1 true EP0456245B1 (de) 1995-01-18

Family

ID=6406161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91107574A Expired - Lifetime EP0456245B1 (de) 1990-05-11 1991-05-10 Zündeinrichtung für ein brennstoffbetriebenes Heizgerät

Country Status (2)

Country Link
EP (1) EP0456245B1 (enrdf_load_stackoverflow)
DE (2) DE4015097C1 (enrdf_load_stackoverflow)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446113C5 (de) * 1994-12-22 2008-08-21 J. Eberspächer GmbH & Co. KG Zündvorrichtung für Heizgeräte
DE19527873C2 (de) * 1995-07-29 2001-09-13 Eberspaecher J Gmbh & Co Einrichtung zum Erzeugen und Zünden eines Brennstoffdampf-Luft-Gemisches
EP0834652B1 (en) * 1996-04-10 2004-10-13 Denso Corporation Glow plug, its production process and ion current detector
DE19622126C2 (de) * 1996-06-01 2003-01-16 Webasto Thermosysteme Gmbh Verfahren zur Zünd- und/oder Flammüberwachung in einem Fahrzeugheizgerät
DE19625823C2 (de) * 1996-06-28 1998-07-02 Webasto Thermosysteme Gmbh Verfahren zur Flammüberwachung für ein Fahrzeugheizgerät
JP3605965B2 (ja) * 1996-09-12 2004-12-22 株式会社デンソー グロープラグ
JP3796846B2 (ja) * 1996-09-12 2006-07-12 株式会社デンソー グロープラグ
EP0845638B1 (de) * 1996-11-29 2004-10-20 WEBASTO THERMOSYSTEME GmbH Zündvorrichtung für ein brennstoffbetriebenes Heizgerät
DE19702339C2 (de) * 1996-11-29 1998-12-03 Webasto Thermosysteme Gmbh Verfahren zum Prüfen der Funktion eines als Flammwächter eingesetzten Glühelementes
DE19649473C2 (de) * 1996-11-29 1999-01-07 Webasto Thermosysteme Gmbh Verfahren zum Überwachen der Flamme in einem brennstoffbetriebenen Heizgerät
DE19709091C1 (de) * 1997-03-06 1998-05-14 Honeywell Bv Flammenüberwachungsschaltung für einen Brenner mit Glühzünder
DE19813313A1 (de) * 1998-03-26 1999-04-15 Bosch Gmbh Robert Verfahren zur Regelung eines Brenners, insbesondere eines vormischenden Gasbrenners
DE19936729C1 (de) * 1999-08-06 2000-11-16 Webasto Thermosysteme Gmbh Verfahren zum Ansteuern eines Glühstifts für das Zünden eines Fahrzeugheizgeräts
DE10025953C2 (de) * 2000-05-26 2002-04-18 Webasto Thermosysteme Gmbh Verfahren zum Ansteuern eines Glühstifts zum Zünden eines Fahrzeugheizgeräts
DE10059846C2 (de) * 2000-11-30 2003-03-20 Webasto Thermosysteme Gmbh Zündelement zur Zündung von Kraftstoff in Zerstäuberbrennern
DE10140972B4 (de) * 2001-08-27 2009-05-07 Webasto Ag Verfahren und System zum Betreiben eines Fahrzeugheizgerätes
DE10162321A1 (de) * 2001-12-18 2003-07-10 Nanogate Technologies Gmbh Flammüberwachung
DE10223948C1 (de) * 2002-05-29 2003-06-12 Webasto Thermosysteme Gmbh Zündeinrichtung und Verfahren zum Betreiben einer Zündeinrichtung für ein Fahrzeugheizgerät
DE10249872B4 (de) * 2002-10-25 2017-03-02 Webasto Ag Mobiles Brennheizgerät mit einem Glühstift/Flammwächter
DE10311898B4 (de) * 2003-03-18 2005-04-21 Webasto Ag Heizgerät f∢r ein Fahrzeug
DE102004038011B3 (de) * 2004-08-04 2006-05-11 Webasto Ag Glüheinrichtung für ein Fahrzeugzusatzheizgerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2641274C3 (de) * 1976-09-14 1979-08-23 Jenaer Glaswerk Schott & Gen., 6500 Mainz Sicherheitseinrichtung für gasbeheizte, transparente Glaskeramikkochflächen
DE2743325C2 (de) * 1976-10-29 1982-05-27 Backer Elektro-Vaerme Ab, Soesdala Elektrische Luftheizungsanlage
DE2802625C3 (de) * 1978-01-21 1985-07-18 BERU Ruprecht GmbH & Co KG, 7140 Ludwigsburg Glühkerze
DE3607574A1 (de) * 1986-03-07 1987-09-10 Rudolf Schreiner Startvorrichtung fuer zusatzheizungen mit dochtbrennern
DE3706555A1 (de) * 1986-07-18 1988-01-21 Webasto Werk Baier Kg W Zuendeinrichtung fuer ein brennstoffbetriebenes heizgeraet
DE3932602C1 (enrdf_load_stackoverflow) * 1989-09-29 1990-04-26 Schoeller & Co Elektrotechnische Fabrik Gmbh & Co, 6000 Frankfurt, De

Also Published As

Publication number Publication date
DE59104287D1 (de) 1995-03-02
EP0456245A3 (en) 1992-02-19
EP0456245A2 (de) 1991-11-13
DE4015097C1 (enrdf_load_stackoverflow) 1991-04-11

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