EP0967391B1 - Procedure and device for monitoring the combustion in the combustion chamber of an internal-combustion engine - Google Patents

Procedure and device for monitoring the combustion in the combustion chamber of an internal-combustion engine Download PDF

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Publication number
EP0967391B1
EP0967391B1 EP99111230A EP99111230A EP0967391B1 EP 0967391 B1 EP0967391 B1 EP 0967391B1 EP 99111230 A EP99111230 A EP 99111230A EP 99111230 A EP99111230 A EP 99111230A EP 0967391 B1 EP0967391 B1 EP 0967391B1
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EP
European Patent Office
Prior art keywords
combustion chamber
high frequency
combustion
glow plug
heater rod
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
EP99111230A
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German (de)
French (fr)
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EP0967391A2 (en
EP0967391A3 (en
Inventor
Bruno Dr. Lindl
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Publication of EP0967391A3 publication Critical patent/EP0967391A3/en
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Classifications

    • 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
    • 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • 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
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • F02P23/045—Other physical ignition means, e.g. using laser rays using electromagnetic microwaves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/021—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using an ionic current sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
    • 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
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F02P17/12—Testing characteristics of the spark, ignition voltage or current
    • F02P2017/125—Measuring ionisation of combustion gas, e.g. by using ignition circuits

Definitions

  • the invention relates to a method and a device to monitor the combustion processes in the combustion chamber an internal combustion engine, in particular a diesel engine, at least one glow plug in the cylinder head is arranged with heating element.
  • EP-A-0 834 652 already describes a method and a device for monitoring the combustion processes in the Combustion chamber of an internal combustion engine known, in the Cylinder head at least one glow plug with heating element is arranged, in which the heating element of the glow plug against the cylinder head with an alternating voltage is applied and the ion current, which then between the heating rod area projecting into the combustion chamber and of the cylinder head wall on the combustion chamber and is evaluated.
  • Electrodes an ion current sensor namely the electrodes a spark plug with a high-frequency AC voltage act upon the accuracy when capturing the To improve ion current.
  • the invention is intended to provide a method and a Device of the type mentioned are created with which the combustion processes in the combustion chamber one Internal combustion engine can be monitored in a simple manner without significant structural changes to the Machine must be made.
  • the device according to the invention measures the ion current and evaluated, which is between the heating rod surface the heating element of the glow plug and the combustion chamber surface trains and is a measure of the combustion processes.
  • the im Cylinder head already used glow plug and the ion current modulation occurring at the glow plug is Signal to monitor the combustion processes, especially to determine the combustion chamber pressure, evaluated.
  • the cylinder head is 1 a glow plug with heating element 2 is arranged in a diesel engine.
  • the one arranged in the heating element 2 Filament supplied by a battery 6 with a direct current.
  • a High-frequency generator 4 is provided, which is a high-frequency AC voltage generated on the heating element 2 of the glow plug lies.
  • a switch 5 is preferably provided, the two Has switch positions in which he either the battery 6 with the heating element 2 of the glow plug for glow operation or the high-frequency generator 4 with the heating element 2 the glow plug for combustion monitoring operation, in particular for measuring the combustion chamber pressure.
  • a demodulator, comparator and evaluation circuit 3 is used to that coming from heating element 2 in monitoring mode Evaluate signal. For this purpose, this circuit is 3rd both with the heating element 2 and the high-frequency generator 4 connected. At its output 7 it delivers a signal that for the parameters of the combustion processes in the combustion chamber of the Machine representative, especially proportional to combustion chamber pressure, is.
  • the arrangement shown in Fig. 1 works in the following way:
  • the modulating supply frequency can be chosen in this way be that as a microstructure on the compression / Decompression wave appears, with the frequency value of the corresponds to the required resolution of the pressure wave.
  • the temporal Change in amplitude and phase of the ion current function is proportional to the pressure change in the combustion chamber over time. Because of the differentiation according to time, all are the signal current influencing parasitic impedances, such as contact resistances at electrical connection points or Shunts due to soot or coal formation between the heating element 2 and cylinder head 1 suppressed. The pressure change over time is therefore proportional to the temporal current signal.
  • a switch 5 is provided, via which between the Supply of heating element 2 with current from battery 6 or with a high-frequency AC voltage from the high-frequency generator 4 can be switched, it is also possible the high frequency AC voltage of the glow voltage of overlay the battery 6. To do this, however, appropriate Interference suppression measures are taken in order to to avoid disruptive influences in the rest of the electrical system.
  • FIG. 2 A particularly preferred form of training is shown in FIG. 2 shown in the drawing.
  • the heating element 2 is electrically insulated via insulation 9 installed the glow plug body 10 and lies the glow voltage from the battery 6 on the glow tube 8 of the heating element 2.
  • the im Glow tube 8 is arranged heating coil with its combustion chamber side End connected to the glow tube 8 and lies with their other end in mass.
  • the heating element 2 is particularly mounted and is galvanically isolated in the glow plug body 10 the glow plug body 10 with its external thread in the cylinder head 1 screwed. It is therefore at ground potential.
  • the glow tube 8 is defined with an alternating voltage Amplitude and frequency applied by the high-frequency generator 4, this in turn forms between the ground potential located cylinder head wall on the combustion chamber side and the one with high-frequency AC voltage Glow tube 8 an ion current 11, the current function as Parameters include the combustion chamber pressure.
  • the embodiment shown in Fig. 2 has the special advantage that in the circuit shown there the glow resistance of the filament of the heating element 2 as Termination resistance of the resonant circuit acts.

Abstract

The method involves using a high frequency generator (4) to supply a heating rod (2) of at least one spark plug arranged in a cylinder head (1) of a combustion chamber with a high-frequency voltage. A thereby produced ion current between the heating rod and the surface of the cylinder head is measured and evaluated. The ion current is preferably evaluated with an evaluation circuit (3), especially to determine a pressure in the combustion chamber. An Independent claim is provided for an arrangement for monitoring the combustion process.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Überwachen der Verbrennungsvorgänge in der Brennkammer einer Brennkraftmaschine, insbesondere einer Dieselmaschine, in deren Zylinderkopf wenigstens eine Glühkerze mit Heizstab angeordnet ist.The invention relates to a method and a device to monitor the combustion processes in the combustion chamber an internal combustion engine, in particular a diesel engine, at least one glow plug in the cylinder head is arranged with heating element.

Die Überwachung der Verbrennungsvorgänge in einer Brennkraftmaschine, insbesondere des Brennraumdruckes, der Brennraumtemperatur und der Flammenfront, ist die Voraussetzung für eine optimale Regelung einer Brennkraftmaschine, insbesondere einer Dieselmaschine. Insbesondere ist über die Messung des Brennraumdruckes eine brennraumdruckgeführte Dieselmaschinenregelung möglich.Monitoring the combustion processes in one Internal combustion engine, in particular the combustion chamber pressure, the The combustion chamber temperature and the flame front is the prerequisite for optimal control of an internal combustion engine, especially a diesel engine. In particular, is about the Measurement of the combustion chamber pressure Diesel engine control possible.

Motorregelungen, Glühzeitsteuerungen und entsprechende Drucksensoren sind an sich bekannt. Die Anordnung von separaten Drucksensoren neben der Glühkerze im Zylinderkopf der Brennkraftmaschine ist jedoch aus Platzgründen kaum möglich oder sogar ausgeschlossen.Engine controls, glow time controls and corresponding Pressure sensors are known per se. The arrangement of separate Pressure sensors next to the glow plug in the cylinder head of the However, internal combustion engine is hardly possible for reasons of space or even excluded.

Aus der EP-A-0 834 652 sind bereits ein Verfahren und eine Vorrichtung zum Überwachen der Verbrennungsvorgänge im Brennraum einer Brennkraftmaschine bekannt, in deren Zylinderkopf wenigstens eine Glühkerze mit Heizstab angeordnet ist, bei denen der Heizstab der Glühkerze gegenüber dem Zylinderkopf mit einer Wechselspannung beaufschlagt wird und der Ionenstrom, der sich daraufhin zwischen dem in den Brennraum ragenden Heizstabbereich und der brennraumseitigen Zylinderkopfwand ausbildet, gemessen und ausgewertet wird.EP-A-0 834 652 already describes a method and a device for monitoring the combustion processes in the Combustion chamber of an internal combustion engine known, in the Cylinder head at least one glow plug with heating element is arranged, in which the heating element of the glow plug against the cylinder head with an alternating voltage is applied and the ion current, which then between the heating rod area projecting into the combustion chamber and of the cylinder head wall on the combustion chamber and is evaluated.

Aus der DE 196 18 980 A ist es weiterhin bekannt, die Elektroden einen Ionenstromsensors, nämlich die Elektroden einer Zündkerze, mit einer hochfrequenten Wechselspannung zu beaufschlagen, um die Genauigkeit beim Erfassen des Ionenstroms zu verbessern.From DE 196 18 980 A it is also known that Electrodes an ion current sensor, namely the electrodes a spark plug with a high-frequency AC voltage act upon the accuracy when capturing the To improve ion current.

Durch die Erfindung sollen ein Verfahren und eine Vorrichtung der eingangs genannten Art geschaffen werden, mit denen die Verbrennungsvorgänge in der Brennkammer einer Brennkraftmaschine in einfacher Weise überwacht werden können, ohne daß erhebliche bauliche Veränderungen an der Maschine vorgenommen werden müssen.The invention is intended to provide a method and a Device of the type mentioned are created with which the combustion processes in the combustion chamber one Internal combustion engine can be monitored in a simple manner without significant structural changes to the Machine must be made.

Diese Aufgabe wird gemäß der Erfindung durch die Ausbildung gelöst, die in den Ansprüche 1 und 4 jeweils angegeben ist.This object is achieved according to the invention through training solved, specified in claims 1 and 4, respectively is.

Bei dem erfindungsgemäßen Verfahren und der erfindungsgemäßen Vorrichtung wird der Ionenstrom gemessen und ausgewertet, der sich zwischen der Heizstaboberfläche des Heizstabes der Glühkerze und der Brennraumoberfläche ausbildet und ein Maß für die Verbrennungsvorgänge ist.In the inventive method and The device according to the invention measures the ion current and evaluated, which is between the heating rod surface the heating element of the glow plug and the combustion chamber surface trains and is a measure of the combustion processes.

Anstelle eines separaten Drucksensors wird dazu die im Zylinderkopf ohnehin vorgesehene Glühkerze eingesetzt und wird das an der Glühkerze auftretende ionenstrommodulierte Signal zur Überwachung der Verbrennungsvorgänge, insbesondere zur Ermittlung des Brennraumdruckes, ausgewertet.Instead of a separate pressure sensor, the im Cylinder head already used glow plug and the ion current modulation occurring at the glow plug is Signal to monitor the combustion processes, especially to determine the combustion chamber pressure, evaluated.

Die dadurch erzielten Vorteile sind unter anderem darin zu sehen, daß an der Maschine selbst keine baulichen Veränderungen vorgenommen werden müssen, insbesondere keine separaten Drucksensoren eingebaut werden müssen.The advantages achieved thereby are among others to be seen in the fact that there are no structural features on the machine itself Changes need to be made, especially none separate pressure sensors must be installed.

Besonders bevorzugte Weiterbildungen und Ausgestaltungen des erfindungsgemäßen Verfahrens und der erfindungsgemäßen Vorrichtung sind Gegenstand der Patentansprüche 2, 3, bzw. 5 und 6.Particularly preferred further developments and refinements the inventive method and the inventive Device are the subject of claims 2, 3, or 5 and 6.

Im folgenden werden anhand der zugehörigen Zeichnung besonders bevorzugte Ausführungsbeispiele der Erfindung näher beschrieben. Es zeigen

  • Fig. 1 ein schematisches Schaltbild eines ersten Ausführungsbeispiels und
  • Fig. 2 ein schematisches Schaltbild eines zweiten Ausführungsbeispiels.
    • Particularly preferred exemplary embodiments of the invention are described in more detail below with reference to the accompanying drawing. Show it
  • Fig. 1 is a schematic diagram of a first embodiment and
  • Fig. 2 is a schematic circuit diagram of a second embodiment.

    • Wie es in Fig. 1 dargestellt ist, ist im Zylinderkopf 1 einer Dieselmaschine eine Glühkerze mit Heizstab 2 angeordnet. Im normalen Betrieb wird die im Heizstab 2 angeordnete Glühwendel über eine Batterie 6 mit einem Gleichstrom versorgt.As shown in FIG. 1, the cylinder head is 1 a glow plug with heating element 2 is arranged in a diesel engine. In normal operation, the one arranged in the heating element 2 Filament supplied by a battery 6 with a direct current.

    Wie es weiterhin in Fig. 1 dargestellt ist, ist ein Hochfrequenzgenerator 4 vorgesehen, der eine hochfrequente Wechselspannung erzeugt, die am Heizstab 2 der Glühkerze liegt. Vorzugsweise ist ein Schalter 5 vorgesehen, der zwei Schalterstellungen hat, in denen er entweder die Batterie 6 mit dem Heizstab 2 der Glühkerze für den Glühbetrieb verbindet oder den Hochfrequenzgenerator 4 mit dem Heizstab 2 der Glühkerze für den Verbrennungsüberwachungsbetrieb, insbesondere für die Messung des Brennraumdruckes, verbindet. Eine Demodulator-, Komparator- und Auswerteschaltung 3 dient dazu, das vom Heizstab 2 im Überwachungsbetrieb kommende Signal auszuwerten. Zu diesem Zweck ist diese Schaltung 3 sowohl mit dem Heizstab 2 als auch dem Hochfrequenzgenerator 4 verbunden. An ihrem Ausgang 7 liefert sie ein Signal, das für die Parameter der Verbrennungsvorgänge im Brennraum der Maschine repräsentativ, insbesondere brennraumdruckproportional, ist. Die in Fig. 1 dargestellte Anordnung arbeitet in der folgenden Weise:As further shown in Fig. 1, is a High-frequency generator 4 is provided, which is a high-frequency AC voltage generated on the heating element 2 of the glow plug lies. A switch 5 is preferably provided, the two Has switch positions in which he either the battery 6 with the heating element 2 of the glow plug for glow operation or the high-frequency generator 4 with the heating element 2 the glow plug for combustion monitoring operation, in particular for measuring the combustion chamber pressure. A demodulator, comparator and evaluation circuit 3 is used to that coming from heating element 2 in monitoring mode Evaluate signal. For this purpose, this circuit is 3rd both with the heating element 2 and the high-frequency generator 4 connected. At its output 7 it delivers a signal that for the parameters of the combustion processes in the combustion chamber of the Machine representative, especially proportional to combustion chamber pressure, is. The arrangement shown in Fig. 1 works in the following way:

    Im geschlossenen Zustand des Stromkreises von der Batterie 6 zum Heizstab 2 der Glühkerze arbeitet diese im üblichen Glühbetrieb mit Glühzeitsteuerung. Wird diese elektrische Verbindung am Schalter 5 geöffnet und der Heizstab 2 mit dem Hochfrequenzgenerator 4 verbunden, wird eine hochfrequente Wechselspannung an den Heizstab 2 gelegt, so daß sich zwischen dem potentialfreien Heizstab 2 und der Zylinderkopfwandung des Brennraums ein Ionenstrom 11 ausbildet, der insbesondere druckproportional ist. Die elektronische Demodulator-, Komparator- und Auswerteschaltung 3 vergleicht das vom Hochfrequenzgenerator 4 eingespeiste Hochfrequenzsignal mit dem daraufhin von dem Heizstab 2 kommenden ionenstrommodulierten Signal hinsichtlich Amplitude und Phase und erzeugt über eine differenzierte Auswertung ein brennraumdruckproportionales Ausgangssignal am Ausgang 7.In the closed state of the circuit from the battery 6 to the heating element 2 of the glow plug, this works in the usual way Glow mode with glow time control. Will this be electrical Connection at switch 5 opened and heating element 2 connected to the high frequency generator 4, a high frequency AC voltage applied to the heating element 2, so that between the potential-free heating element 2 and the cylinder head wall of the combustion chamber forms an ion current 11, which is particularly proportional to pressure. The electronic Demodulator, comparator and evaluation circuit 3 compares the high-frequency signal fed by the high-frequency generator 4 with the ion current modulation then coming from the heating element 2 Signal regarding amplitude and phase and generates a combustion chamber pressure proportional to a differentiated evaluation Output signal at output 7.

    Die modulierende Versorgungsfrequenz kann dabei so gewählt sein, daß sie als Mikrostruktur auf der Kompressions /Dekompressionswelle erscheint, wobei der Frequenzwert der geforderten Auflösung der Druckwelle entspricht. Die zeitliche Änderung von Amplitude und Phase der Ionenstromfunktion ist der zeitlichen Druckänderung im Brennraum proportional. Wegen der Differenzierung nach der Zeit sind alle den Signalstrom beeinflussenden parasitären Impedanzen, wie Übergangswiderstände an elektrischen Verbindungsstellen oder Nebenschlüsse durch Ruß- oder Kohlebildung, zwischen Heizstab 2 und Zylinderkopf 1 unterdrückt. Die zeitliche Druckänderung ist somit dem zeitlichen Stromsignal proportional.The modulating supply frequency can be chosen in this way be that as a microstructure on the compression / Decompression wave appears, with the frequency value of the corresponds to the required resolution of the pressure wave. The temporal Change in amplitude and phase of the ion current function is proportional to the pressure change in the combustion chamber over time. Because of the differentiation according to time, all are the signal current influencing parasitic impedances, such as contact resistances at electrical connection points or Shunts due to soot or coal formation between the heating element 2 and cylinder head 1 suppressed. The pressure change over time is therefore proportional to the temporal current signal.

    Obwohl bei dem in Fig. 1 dargestellten Ausführungsbeispiel ein Schalter 5 vorgesehen ist, über den zwischen der Versorgung des Heizstabes 2 mit Strom von der Batterie 6 oder mit einer hochfrequenten Wechselspannung vom Hochfrequenzgenerator 4 umgeschaltet werden kann, ist es auch möglich, die hochfrequente Wechselspannung der Glühspannung von der Batterie 6 zu überlagern. Dazu müssen allerdings entsprechende Entstörmaßnahmen am Bordnetz getroffen werden, um störende Einflüsse im übrigen Bordnetz zu vermeiden.Although in the embodiment shown in Fig. 1 a switch 5 is provided, via which between the Supply of heating element 2 with current from battery 6 or with a high-frequency AC voltage from the high-frequency generator 4 can be switched, it is also possible the high frequency AC voltage of the glow voltage of overlay the battery 6. To do this, however, appropriate Interference suppression measures are taken in order to to avoid disruptive influences in the rest of the electrical system.

    Eine besonders bevorzugte Ausbildungsform ist in Fig. 2 der Zeichnung dargestellt. Bei dieser Ausbildungsform ist der Heizstab 2 über eine Isolierung 9 elektrisch isoliert in den Glühkerzenkörper 10 eingebaut und liegt die Glühspannung von der Batterie 6 am Glührohr 8 des Heizstabes 2. Die im Glührohr 8 angeordnete Heizwendel ist mit ihrem brennraumseitigen Ende mit dem Glührohr 8 verbunden und liegt mit ihrem anderen Ende an Masse.A particularly preferred form of training is shown in FIG. 2 shown in the drawing. With this type of training the heating element 2 is electrically insulated via insulation 9 installed the glow plug body 10 and lies the glow voltage from the battery 6 on the glow tube 8 of the heating element 2. The im Glow tube 8 is arranged heating coil with its combustion chamber side End connected to the glow tube 8 and lies with their other end in mass.

    Bei dieser Ausbildung ist der Heizstab 2 insbesondere galvanisch isoliert im Glühkerzenkörper 10 montiert und ist der Glühkerzenkörper 10 mit seinem Außengewinde in den Zylinderkopf 1 geschraubt. Er liegt somit auf Massepotential. Wird das Glührohr 8 mit einer Wechselspannung definierter Amplitude und Frequenz vom Hochfrequenzgenerator 4 beaufschlagt, so bildet sich wiederum zwischen der auf Massepotential befindlichen brennraumseitigen Zylinderkopfwandung und dem mit hochfrequenter Wechselspannung beaufschlagten Glührohr 8 ein Ionenstrom 11 aus, dessen Stromfunktion als Parameter unter anderem den Brennraumdruck enthält.In this design, the heating element 2 is particularly mounted and is galvanically isolated in the glow plug body 10 the glow plug body 10 with its external thread in the cylinder head 1 screwed. It is therefore at ground potential. The glow tube 8 is defined with an alternating voltage Amplitude and frequency applied by the high-frequency generator 4, this in turn forms between the ground potential located cylinder head wall on the combustion chamber side and the one with high-frequency AC voltage Glow tube 8 an ion current 11, the current function as Parameters include the combustion chamber pressure.

    Das in Fig. 2 dargestellte Ausführungsbeispiel hat den besonderen Vorteil, daß bei der dort dargestellten Beschaltung der Glühwiderstand der Glühwendel des Heizstabes 2 als Abschlußwiderstand des Schwingkreises wirkt.The embodiment shown in Fig. 2 has the special advantage that in the circuit shown there the glow resistance of the filament of the heating element 2 as Termination resistance of the resonant circuit acts.

    Dadurch, daß bei den oben beschriebenen Ausbildungen lediglich die potentialfreie Glühkerze beschaltet werden muß und eine zeitdifferenzierende hochfrequente Ionenstromauswertung zur Unterdrückung parasitärer strombeeinflussender Größen erfolgt, läßt sich insbesondere eine brennraumdruckgeführte Motorregelung verwirklichen, die den spezifischen Verbrauch und die Rohemission vermindert. Dazu dient eine einzige Baukomponente mit der Geometrie einer herkömmlichen Glühkerze, die allerdings Glüh- und Sensorfunktion, insbesondere Drucksensorfunktion, erfüllt.The fact that in the training described above only the potential-free glow plug must be connected and a time-differentiating high-frequency ion current evaluation to suppress parasitic current influencing Sizes takes place, a combustion chamber pressure-controlled can in particular Realize engine control, the specific Consumption and raw emissions are reduced. This is what a only component with the geometry of a conventional one Glow plug, which, however, glow and sensor function, in particular Pressure sensor function, fulfilled.

    Claims (7)

    1. Procedure for monitoring the combustion in the combustion chamber of an internal combustion engine; in the cylinder head of which at least one glow plug with heater rod is arranged, characterised by the fact that the heater rod of the glow plug opposite the cylinder head has a high frequency voltage applied and the stream of ions which is formed between the heater rod area extending into the combustion chamber and the cylinder head wall on the combustion chamber side, is measured and evaluated by the high frequency voltage applied to the heater rod of the glow plug being compared with the signal modulated by the stream of ions coming from the heater rod with reference to amplitude and phase.
    2. Procedure according to claim 1, characterised by the fact that the pressure in the combustion chamber is monitored as a parameter for combustion and the stream of ions measured is evaluated as a signal in proportion to the combustion chamber pressure.
    3. Procedure according to claim 1 or 2, characterised by switching between the normal operation of the glow plugs and the monitoring operation with high frequency voltage applied.
    4. Device for monitoring the combustion in the combustion chamber of an internal combustion engine to carry out the procedure according to claim 1, characterised by a high frequency generator (4), the initial voltage of which is applied to the heater rod (2) of the glow plug and an evaluation circuit (3) which is switched between the heater rod (2) of the glow plug and the high frequency generator (4).
    5. Device according to claim 4, characterised by a switch (5) with two settings, which supplies the voltage of a battery (6) or the high frequency voltage of the high frequency generator (4) to the heater rod (2) according to the setting.
    6. Device according to claim 4, characterised by the fact that the initial voltage of the high frequency generator is overlaid on the battery voltage, which is applied to the heater rod.
    7. Device according to claim 4, 5 or 6, characterised by the fact that the heater rod (2) of the glow plug is arranged electrically insulated in the cylinder head (1), the high frequency voltage is applied to the glow tube (8) of the glow plug and the glow coil of the glow plug is connected to the glow tube (8) on one side and earthed on the other side.
    EP99111230A 1998-06-26 1999-06-09 Procedure and device for monitoring the combustion in the combustion chamber of an internal-combustion engine Expired - Lifetime EP0967391B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19828595A DE19828595C2 (en) 1998-06-26 1998-06-26 Method and device for monitoring the combustion processes in the combustion chamber of an internal combustion engine
    DE19828595 1998-06-26

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    EP0967391A2 EP0967391A2 (en) 1999-12-29
    EP0967391A3 EP0967391A3 (en) 2002-01-23
    EP0967391B1 true EP0967391B1 (en) 2004-09-08

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    EP (1) EP0967391B1 (en)
    AT (1) ATE275697T1 (en)
    DE (2) DE19828595C2 (en)
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    Families Citing this family (8)

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    DE19838223C2 (en) * 1998-08-22 2003-02-06 Daimler Chrysler Ag Method for determining the ion content after a combustion process in a self-igniting internal combustion engine
    DE10011614A1 (en) * 2000-03-10 2001-09-13 Delphi Tech Inc Procedure for determining commencement of combustion in cylinder in internal combustion engine entails forming difference between last calculated average value and last stored value and comparing this with threshold value
    DE10015277B4 (en) * 2000-03-28 2009-01-08 Infineon Technologies Ag Device for generating an ion current in the combustion chamber of a diesel engine and a glow plug
    JP3894442B2 (en) * 2003-05-14 2007-03-22 三菱電機株式会社 Internal combustion engine control device
    DE102004005537B3 (en) * 2004-02-04 2005-09-01 Beru Ag Process for analyzing the combustion state in the combustion chamber of a combustion engine comprises acquiring and evaluating the high frequency breakdown for analyzing the particle types in the combustion chamber
    DE102005005280B4 (en) * 2005-02-04 2009-09-24 Continental Automotive Gmbh Device for detecting the pressure in a combustion chamber of an internal combustion engine
    FR2878314A1 (en) * 2005-05-19 2006-05-26 Siemens Vdo Automotive Sas Spark or glow plug equipment for internal combustion engine, has path with unit to block return of ac signal, delivered by sensor of plug, towards ground so that power and signal pass through common terminal to which cable is connected
    DE102010011044B4 (en) 2010-03-11 2012-12-27 Borgwarner Beru Systems Gmbh Method for controlling a glow plug

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    FR2734022B1 (en) * 1995-05-10 1998-06-26 Nippon Soken APPARATUS FOR MONITORING COMBUSTION IN AN INTERNAL COMBUSTION ENGINE
    US6483079B2 (en) * 1996-04-10 2002-11-19 Denso Corporation Glow plug and method of manufacturing the same, and ion current detector
    DE19614288C1 (en) * 1996-04-11 1997-08-07 Telefunken Microelectron Ion-current measurement circuit e.g. for motor vehicle IC engine combustion chamber

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    DE19828595C2 (en) 2002-09-26
    DE59910432D1 (en) 2004-10-14
    DE19828595A1 (en) 1999-12-30
    EP0967391A2 (en) 1999-12-29
    ATE275697T1 (en) 2004-09-15
    ES2224496T3 (en) 2005-03-01
    EP0967391A3 (en) 2002-01-23

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