EP1329630B1 - Glow and ion current measuring device for a Diesel engine - Google Patents

Glow and ion current measuring device for a Diesel engine Download PDF

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Publication number
EP1329630B1
EP1329630B1 EP02027416A EP02027416A EP1329630B1 EP 1329630 B1 EP1329630 B1 EP 1329630B1 EP 02027416 A EP02027416 A EP 02027416A EP 02027416 A EP02027416 A EP 02027416A EP 1329630 B1 EP1329630 B1 EP 1329630B1
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EP
European Patent Office
Prior art keywords
glow
voltage
measurement
ion current
cylinder
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EP02027416A
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German (de)
French (fr)
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EP1329630A2 (en
EP1329630A3 (en
Inventor
Heinz-Georg Schmitz
Rüdiger Herweg
Michael Kessler
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BorgWarner Ludwigsburg GmbH
Mercedes Benz Group AG
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Daimler AG
Beru AG
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Publication of EP1329630A3 publication Critical patent/EP1329630A3/en
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    • 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
    • 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
    • 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
    • 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
    • F23Q2007/002—Glowing plugs for internal-combustion engines with sensing means

Definitions

  • the invention relates to an annealing and Ionenstrommeßvorraum for a diesel engine with a provided for each or individual cylinders of the diesel engine each Glüh- and Ionenstrommeßkerze at the annealing operation is a glow voltage and in measurement operation, a measuring voltage which is lower than the annealing voltage.
  • the glow operation of a glow plug is used in a diesel engine to support the ignition, for example, during cold start or by intermediate annealing. By measuring the ion current in addition, a determination of the combustion conditions in the cylinders of the diesel engine is possible.
  • the glow plugs in particular so energized that they support the ignition with a temperature of more than 800 ° C.
  • the ion current is then measured, which in the cold start z. B. provides information about misfires or ignition delays.
  • Annealing and Ionenstrommeßkerzen that fulfill these functions are from the EP 0 894 976 A2 , of the EP 0 834 652 A1 , of the DE 197 38 915 A1 as well as the DE 197 37 396 A1 known.
  • the object underlying the invention is therefore to provide an annealing and Ionenstrommeßvorraum of the aforementioned type, in which the Glühund the measuring functions do not interfere with each other.
  • the annealing of an incandescent and Ionenstrommeßkerze is interrupted for a certain time in a conventional manner, in order to measure the ion current in this time, decreases the voltage applied to the incandescent and Ionenstrommeßkerze effective voltage.
  • a motor after the Four-stroke process works, measured across a window of 120 ° of the crankshaft angle in each stroke of the ion current, reduces the effective voltage in a four-stroke engine by 8.7% and thus the annealing performance by 16.7%.
  • the glow plug is characterized in the regulated state to a lower temperature so that they can fulfill their task as ignition assistance only inadequate. In a two-stroke engine, this has an even greater effect due to twice the number of strokes.
  • An embodiment of the invention to address this problem is to change the design of the glow and Ionenstrommeßkerze so that the necessary temperatures are achieved with the lower effective voltage available.
  • the Glüh- and Ionenstrommeßkerzen controlled with a suitable controller so that at a synchronized with the combustion clocked annealing for the duration of the expected ion current signal, for example, from the beginning of the first injection over 120 ° of the crankshaft angle, which at an engine speed of 1000 revolutions per minute of a time of 20 ms, the annealing is interrupted and the measuring voltage for the ion current measurement is applied.
  • the synchronization of the switching operations with the motor and drive clocks can be ensured by a communication with the engine control unit or by a suitable separate control. Not every stroke must be keptmett, the measurement can easily be made only for the second, third and fourth power stroke. The glow and Ionenstrommeßkerze is then adapted accordingly.
  • crankshaft angle of 700 ° corresponds to the crankshaft angle of -20 °, so that the in FIG. 1 Repeat the operations shown periodically.
  • an annealing control device which periodically switches on and off the available vehicle electrical system voltage, that is, the annealing and Ionenstrommeßschreiben clocked in the form of voltage pulses that extend over part of the crankshaft angle. So that even with such a timing of the annealing voltage, the temperatures necessary for the operation of the diesel engine are reached, the annealing and Ionenstrommeßkerze is designed so that its nominal voltage at which it reaches the required temperatures, only a fraction of the available mains voltage , In on-board systems with 14 volts, this nominal voltage is about 4 to 9 volts.
  • the timing by the Glüh horrinvorraum is synchronized with the ignition timing of the individual cylinders so that the break in the energization for the annealing operation starts at about the expected time of ignition or combustion, where the ion current can occur.
  • the measuring voltage is applied to the glow and Ionenstrommeßkerze, which is substantially lower than the annealing voltage, so that during this time the Glüh- and Ionenstrommeßkerze works as an electrode or sensor for measuring the ion current.
  • the timing is preferably such that the energization of the individual annealing and Ionenstrommeßkerzen for the cylinder takes place so that it is turned on analogous to the ignition of the cylinder in succession, whereby the current load of the electrical system is made uniform.
  • a possibly existing time delay, which exists between the end of the energization of the glow and Ionenstrommeßkerze for glow operation and the actual achievement of the maximum temperature can be calculated and compensated for by a correspondingly preferred energization of the glow and Ionenstrommeßkerze.
  • the timing is such that the GlühHarsimpulse and the Meßschreibsimpulse the annealing and Ionenstrommeßkerzen of two different cylinders, such as the GlühHarsimpuls 10 for the annealing and Ionenstrommeßkerze the fourth cylinder overlap with the Meßschreibsimpuls 9 for the Glühund Ionenstrommeßkerze the first cylinder.
  • incandescent and Ionenstrommeßvorraumen include the lower power consumption of the individual incandescent and Ionenstrommeßkerzen and the possibility of better tracking of the annealing voltage to the current engine operating condition, such as the speed, the injection quantity, the temperature, the timing of the combustion process, etc. As a result, the temperature of the glow and Ionenstrommeßkerzen be better adapted to the requirements of the engine, as previously possible was.
  • annealing and Ionenstrommeßvorraumen ion current signals can be measured at the same time full functionality of the annealing operation, for example as a cold start help.
  • an operating mode is possible in which the highest possible temperature at the ignition and Ionenstrommeßkerze available at the expected ignition timing.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The device has a glow and ion current measurement plug for each or the cylinder that carries a glow voltage in glow mode and a measurement voltage in measurement mode and a controller that clocks the glow and measurement voltages and applies them to the glow and ion current measurement plug synchronously with the combustion processes in the cylinder's combustion chamber.

Description

Die Erfindung betrifft eine Glüh- und Ionenstrommeßvorrichtung für einen Dieselmotor mit einer für jeden oder einzelne Zylinder des Dieselmotors jeweils vorgesehenen Glüh- und Ionenstrommeßkerze, an der im Glühbetrieb eine Glühspannung und im Meßbetrieb eine Meßspannung liegt, die niedriger als die Glühspannung ist.The invention relates to an annealing and Ionenstrommeßvorrichtung for a diesel engine with a provided for each or individual cylinders of the diesel engine each Glüh- and Ionenstrommeßkerze at the annealing operation is a glow voltage and in measurement operation, a measuring voltage which is lower than the annealing voltage.

Der Glühbetrieb einer Glühkerze dient bei einem Dieselmotor dazu, die Zündung beispielsweise beim Kaltstart oder durch Zwischenglühen zu unterstützen. Durch das Messen des Ionenstromes ist darüber hinaus eine Ermittlung der Verbrennungsverhältnisse in den Zylindern des Dieselmotors möglich.The glow operation of a glow plug is used in a diesel engine to support the ignition, for example, during cold start or by intermediate annealing. By measuring the ion current in addition, a determination of the combustion conditions in the cylinders of the diesel engine is possible.

Bei einem Kaltstart eines Dieselmotors werden zur Verbesserung des Startverhaltens des Motors die Glühkerzen insbesondere so bestromt, daß sie mit einer Temperatur von mehr als 800°C die Zündung unterstützen. Parallel dazu wird dann der Ionenstrom gemessen, der im Kaltstart z. B. Informationen über Zündaussetzer oder Zündverzögerungen liefert.When a cold start of a diesel engine will be to the improvement the starting behavior of the engine, the glow plugs in particular so energized that they support the ignition with a temperature of more than 800 ° C. In parallel, the ion current is then measured, which in the cold start z. B. provides information about misfires or ignition delays.

Glüh- und Ionenstrommeßkerzen, die diese Funktionen erfüllen, sind aus der EP 0 894 976 A2 , der EP 0 834 652 A1 , der DE 197 38 915 A1 sowie der DE 197 37 396 A1 bekannt.Annealing and Ionenstrommeßkerzen that fulfill these functions are from the EP 0 894 976 A2 , of the EP 0 834 652 A1 , of the DE 197 38 915 A1 as well as the DE 197 37 396 A1 known.

Bei den bekannten Glüh- und Ionenstrommeßkerzen wird für die Ionenstrommessung die an der Glühkerze liegende Glühspannung abgenommen und die Meßspannung angelegt, die nicht zu einem Stromfluß durch das Heizelement führt, so daß die Glühfunktion unterbrochen wird, was zur Folge hat, daß sich die Glühkerze für die Zeit der Ionenstrommessung abkühlt. Das heißt, daß bei den bekannten Glüh- und Ionenstrommeßkerzen die jeweils eine Funktion, nämlich die Glühoder die Meßfunktion, durch die jeweils andere Funktion beeinträchtigt ist.In the known incandescent and Ionenstrommeßkerzen the lying on the glow plug annealing voltage is removed and applied the measuring voltage, which does not lead to a current flow through the heating element, so that the annealing function is interrupted, with the result that the glow plug for the time of the ion current measurement cools down. That is, in the known incandescent and Ionenstrommeßkerzen each one function, namely the Glühoder the measurement function, is affected by the other function.

Die der Erfindung zugrunde liegende Aufgabe besteht daher darin, eine Glüh- und Ionenstrommeßvorrichtung der eingangs genannten Art zu schaffen, bei der sich die Glühund die Meßfunktionen gegenseitig nicht beeinträchtigen.The object underlying the invention is therefore to provide an annealing and Ionenstrommeßvorrichtung of the aforementioned type, in which the Glühund the measuring functions do not interfere with each other.

Diese Aufgabe wird gemäß der Erfindung durch die Ausbildung gelöst, die im Patentanspruch 1 angegeben ist.This object is achieved according to the invention by the formation which is specified in claim 1.

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

  • Figur 1 die Abfolge der Glüh- und lonenstrommeßvorgänge bei einem ersten Ausführungsbeispiel und
  • Figur 2 die Abfolge der Glüh- und Ionenstrommeßvorgänge bei einem zweiten Ausführungsbeispiel.
In the following, particularly preferred embodiments of the invention will be described with reference to the accompanying drawings. Show it
  • FIG. 1 the sequence of the Glüh- and lonenstrommeßvorgänge in a first embodiment and
  • FIG. 2 the sequence of the Glüh- and Ionenstrommeßvorgänge in a second embodiment.

Wenn in üblicher Weise das Glühen einer Glüh- und Ionenstrommeßkerze für eine bestimmte Zeit unterbrochen wird, um in dieser Zeit den Ionenstrom messen zu können, nimmt die an der Glüh- und Ionenstrommeßkerze liegende Effektivspannung ab. Wenn beispielsweise bei einem Motor, der nach dem Viertaktverfahren arbeitet, über ein Fenster von 120° des Kurbelwellenwinkels in jedem Arbeitstakt der Ionenstrom gemessen wird, reduziert sich bei einem Viertaktmotor die effektive Spannung um 8,7 % und damit die Glühleistung um 16,7 %. Die Glühkerze kommt dadurch im ausgeregelten Zustand auf eine geringere Temperatur so daß sie ihre Aufgabe als Zündungsunterstützung nur unzureichend erfüllen kann. Bei einem Zweitaktmotor wirkt sich das aufgrund der doppelt so häufigen Arbeitstakte noch deutlicher aus.If the annealing of an incandescent and Ionenstrommeßkerze is interrupted for a certain time in a conventional manner, in order to measure the ion current in this time, decreases the voltage applied to the incandescent and Ionenstrommeßkerze effective voltage. For example, if a motor after the Four-stroke process works, measured across a window of 120 ° of the crankshaft angle in each stroke of the ion current, reduces the effective voltage in a four-stroke engine by 8.7% and thus the annealing performance by 16.7%. The glow plug is characterized in the regulated state to a lower temperature so that they can fulfill their task as ignition assistance only inadequate. In a two-stroke engine, this has an even greater effect due to twice the number of strokes.

Eine erfindungsgemäße Ausbildung, diesem Problem zu begegnen besteht darin, die Auslegung der Glüh- und Ionenstrommeßkerze so zu verändern, daß mit der geringeren zur Verfügung stehenden Effektivspannung die notwendigen Temperaturen erreicht werden. Dabei werden gemäß Figur 1 die Glüh- und Ionenstrommeßkerzen mit einem geeigneten Steuergerät so angesteuert, daß bei einer mit dem Verbrennungsvorgang synchronisierten getakteten Glühung für die Zeitdauer des erwarteten Ionenstromsignals beispielsweise ab Beginn der ersten Einspritzung über 120° des Kurbelwellenwinkels, was bei einer Motordrehzahl von 1000 Umdrehungen pro Minute einer Zeit von 20 ms entspricht, das Glühen unterbrochen wird und die Meßspannung für die Ionenstrommessung angelegt wird. Die Synchronisierung der Schaltvorgänge mit den Motorund Antriebstakten kann durch eine Kommunikation mit dem Motorsteuergerät oder durch eine geeignete separate Steuerung sichergestellt werden. Dabei muß nicht jeder Arbeitstakt ausgefenstert werden, die Messung kann ohne weiteres auch nur für den zweiten, dritten und vierten Arbeitstakt erfolgen. Die Glüh- und Ionenstrommeßkerze wird dann dementsprechend angepaßt.An embodiment of the invention to address this problem is to change the design of the glow and Ionenstrommeßkerze so that the necessary temperatures are achieved with the lower effective voltage available. In doing so, according to FIG. 1 the Glüh- and Ionenstrommeßkerzen controlled with a suitable controller so that at a synchronized with the combustion clocked annealing for the duration of the expected ion current signal, for example, from the beginning of the first injection over 120 ° of the crankshaft angle, which at an engine speed of 1000 revolutions per minute of a time of 20 ms, the annealing is interrupted and the measuring voltage for the ion current measurement is applied. The synchronization of the switching operations with the motor and drive clocks can be ensured by a communication with the engine control unit or by a suitable separate control. Not every stroke must be ausgefenstert, the measurement can easily be made only for the second, third and fourth power stroke. The glow and Ionenstrommeßkerze is then adapted accordingly.

Ist es für die Ansteuerung einfacher oder günstiger, jeden oberen Totpunkt und nicht nur diejenigen mit erwarteter Zündung (jeder zweite bei Viertaktmotoren) auszufenstern, ist das analog mit einer noch niedrigeren Nominalspannung der Glühkerzen durchführbar.If it is easier or more favorable for the control to burn out each top dead center and not just those with expected ignition (every second in four-stroke engines), this can be carried out analogously with an even lower nominal voltage of the glow plugs.

Das heißt im einzelnen, daß gemäß Figur 1 bei einer Kurbelwellenwinkelstellung von -20° mit der Ionenstrommeßung im Zylinder 1 begonnen wird und sich daran bei einem Kurbelwellenwinkel von 100° das Glühen im Zylinder 1 anschließt. Mit 3 und 4 sowie 5 und 6 und 7 und 8 sind die Meß- und Glühvorgänge für die Zylinder 2, 3 und 4 jeweils bezeichnet.That means in detail that according to FIG. 1 at a Crankshaft angle position of -20 ° with the Ionenstrommeßung in the cylinder 1 is started and it adjoins the annealing in the cylinder 1 at a crank angle of 100 °. With 3 and 4 and 5 and 6 and 7 and 8, the measuring and annealing operations for the cylinders 2, 3 and 4 are respectively designated.

Der Kurbelwellenwinkel von 700° entspricht dem Kurbelwellenwinkel von -20°, so daß sich die in Figur 1 dargestellten Vorgänge periodisch wiederholen.The crankshaft angle of 700 ° corresponds to the crankshaft angle of -20 °, so that the in FIG. 1 Repeat the operations shown periodically.

Durch die Synchronisierung der getakteten Glühung mit dem Verbrennungsvorgang im Brennraum und insbesondere dadurch, daß der Beginn der Ionenstrommeßphase mit dem zu erwartenden Zeitpunkt der Zündung bzw. des Verbrennungsvorgangs zusammenfällt, kommt es zu keiner Funktionseinbuße der Glüh- und Ionenstrommeßkerze. In dieser Weise ist es möglich, die Ionenstrommeßspannung an der Glühkerze zum Zeitpunkt eines zu erwartenden Ionenstromsignals während des Verbrennungsvorgangs anzulegen und die verbleibende Zeit für die Bestromung der Glüh- und Ionenstrommeßkerze zu nutzen, so daß durch die Ionenstrommessung kein Nachteil hinsichtlich der Temperatur der Glüh- und Ionenstrommeßkerze auftritt.By synchronizing the pulsed annealing with the combustion process in the combustion chamber and in particular by the fact that the beginning of the Ionenstrommeßphase coincides with the expected time of ignition or the combustion process, there is no loss of function of the incandescent and Ionenstrommeßkerze. In this way it is possible to apply the Ionenstrommeßspannung to the glow plug at the time of an expected ion current signal during the combustion process and to use the remaining time for the energization of the glow and Ionenstrommeßkerze, so that by the ion current measurement no disadvantage with respect to the temperature of the annealing and Ionenstrommeßkerze occurs.

Bei dem zweiten in Figur 2 dargestellten Ausführungsbeispiel der erfindungsgemäßen Glüh- und Ionenstrommeßvorrichtung ist eine Glühsteuervorrichtung vorgesehen, die die zur Verfügung stehende Bordnetzspannung periodisch ein- und ausschaltet, d. h. die Glüh- und Ionenstrommeßspannungen in Form von Spannungsimpulsen zeitlich taktet, die sich über einen Teil des Kurbelwellenwinkels erstrecken. Damit auch bei einer derartigen Taktung der Glühspannung die für den Betrieb des Dieselmotors notwendigen Temperaturen erreicht werden, ist die Glüh- und Ionenstrommeßkerze so ausgelegt, daß ihre nominelle Spannung, bei der sie die erforderlichen Temperaturen erreicht, nur einen Bruchteil der zur Verfügung stehenden Netzspannung beträgt. Bei Bordnetzsystemen mit 14 Volt liegt diese nominelle Spannung bei etwa 4 bis 9 Volt.At the second in FIG. 2 illustrated embodiment of the invention Glüh- and Ionenstrommeßvorrichtung an annealing control device is provided which periodically switches on and off the available vehicle electrical system voltage, that is, the annealing and Ionenstrommeßspannungen clocked in the form of voltage pulses that extend over part of the crankshaft angle. So that even with such a timing of the annealing voltage, the temperatures necessary for the operation of the diesel engine are reached, the annealing and Ionenstrommeßkerze is designed so that its nominal voltage at which it reaches the required temperatures, only a fraction of the available mains voltage , In on-board systems with 14 volts, this nominal voltage is about 4 to 9 volts.

Die Glüh- und Ionenstrommeßkerzen werden in dieser Weise mit einer Effektivspannung versorgt, die der für das Erreichen der notwendigen Temperatur erforderlichen Spannung entspricht.The glow and Ionenstrommeßkerzen be in this Manner supplied with an effective voltage that corresponds to the voltage required to reach the necessary temperature.

Die Taktung durch die Glühsteuervorrichtung wird mit den Zündzeitpunkten der einzelnen Zylinder so synchronisiert, daß die Pause in der Bestromung für den Glühbetrieb etwa mit dem erwarteten Zeitpunkt der Zündung bzw. der Verbrennung beginnt, an dem der Ionenstrom auftreten kann. In dieser Zeit liegt die Meßspannung an der Glüh- und Ionenstrommeßkerze, die wesentlich niedriger als die Glühspannung ist, so daß während dieser Zeit die Glüh- und Ionenstrommeßkerze als Elektrode bzw. Sensor zum Messen des Ionenstromes arbeitet.The timing by the Glühsteuervorrichtung is synchronized with the ignition timing of the individual cylinders so that the break in the energization for the annealing operation starts at about the expected time of ignition or combustion, where the ion current can occur. During this time, the measuring voltage is applied to the glow and Ionenstrommeßkerze, which is substantially lower than the annealing voltage, so that during this time the Glüh- and Ionenstrommeßkerze works as an electrode or sensor for measuring the ion current.

Die Taktung erfolgt vorzugsweise derart, daß die Bestromung der einzelnen Glüh- und Ionenstrommeßkerzen für die Zylinder so erfolgt, daß sie analog der Zündung der Zylinder nacheinander eingeschaltet wird, wodurch die Strombelastung des Bordnetzes vergleichmäßigt wird.The timing is preferably such that the energization of the individual annealing and Ionenstrommeßkerzen for the cylinder takes place so that it is turned on analogous to the ignition of the cylinder in succession, whereby the current load of the electrical system is made uniform.

Wie es in Figur 2 dargestellt ist, kann das beispielsweise dadurch erfolgen, daß die Glüh- und Ionenstrommeßkerzen bis zu einem Zeitpunkt unmittelbar vor der Ionenstrommessung mit der Glühspannung versorgt werden und sich daran direkt das Anlegen der Meßspannung anschließt. Das hat den Vorteil, daß die Glüh- und Ionenstrommeßkerze genau zur Zündung die höchstmögliche Temperatur erreicht, wenn der Zündzeitpunkt der Beginn der Ionenstrommeßzeit ist. Ein dabei eventuell vorhandener Zeitverzug, der zwischen dem Ende der Bestromung der Glüh- und Ionenstrommeßkerze für den Glühbetrieb und dem tatsächlichen Erreichen der maximalen Temperatur besteht, kann berechnet und über eine entsprechend vorgezogene Bestromung der Glüh- und Ionenstrommeßkerze kompensiert werden. Das kann auch auf zwei oder mehrere Perioden innerhalb der vier bzw. zwei Takte des Motors aufgeteilt werden, was zu gleichmäßigeren Temperaturen, besonders bei niedrigeren Drehzahlen mit entsprechend langen Zeitspannen zwischen den einzelnen Zündungen führt.As it is in FIG. 2 is shown, this can be done, for example, that the incandescent and Ionenstrommeßkerzen be supplied to a point of time immediately before the ion current measurement with the annealing voltage and it is followed directly by the application of the measuring voltage. This has the advantage that the glow and Ionenstrommeßkerze exactly the ignition reaches the highest possible temperature when the ignition is the beginning of the Ionenstrommeßzeit. A possibly existing time delay, which exists between the end of the energization of the glow and Ionenstrommeßkerze for glow operation and the actual achievement of the maximum temperature can be calculated and compensated for by a correspondingly preferred energization of the glow and Ionenstrommeßkerze. This can also be divided into two or more periods within the four or two strokes of the engine, which leads to more uniform temperatures, especially at lower speeds with correspondingly long time intervals between the individual ignitions.

Wie es in Figur 2 weiterhin dargestellt ist, wird bei der Spannungstaktung ein Überlappen der jeweiligen Glühoder Meßspannungen, die an den einzelnen Glüh- und Ionenstrommeßkerzen der Zylinder liegen, vermieden. Das ergibt sich aus den dargestellten Glühspannungsimpulsen 10, 12, 14, 16,' die an den einzelnen Glüh- und Ionenstrommeßkerzen der Zylinder liegen, sowie aus den Meßspannungsimpulsen 9, 11, 13, 15, die entsprechend an den Glüh- und Ionenstrommeßkerzen der einzelnen Zylinder liegen. Die Taktung erfolgt allerdings derart, daß sich die Glühspannungsimpulse und die Meßspannungsimpulse der Glüh- und Ionenstrommeßkerzen von zwei verschiedenen Zylindern, beispielsweise der Glühspannungsimpuls 10 für die Glüh- und Ionenstrommeßkerze des vierten Zylinders mit dem Meßspannungsimpuls 9 für die Glühund Ionenstrommeßkerze des ersten Zylinders überlappen.As it is in FIG. 2 is further shown, in the voltage timing overlap of the respective Glühoder measuring voltages, which are located on the individual annealing and Ionenstrommeßkerzen the cylinder avoided. This results from the illustrated Glühspannungsimpulsen 10, 12, 14, 16, 'which are located on the individual Glüh- and Ionenstrommeßkerzen the cylinder, as well as from the Meßspannungsimpulsen 9, 11, 13, 15, corresponding to the annealing and Ionenstrommeßkerzen the individual Cylinder lie. However, the timing is such that the Glühspannungsimpulse and the Meßspannungsimpulse the annealing and Ionenstrommeßkerzen of two different cylinders, such as the Glühspannungsimpuls 10 for the annealing and Ionenstrommeßkerze the fourth cylinder overlap with the Meßspannungsimpuls 9 for the Glühund Ionenstrommeßkerze the first cylinder.

Aus der Zeichnung ist weiterhin erkennbar, daß sich die Glühspannungs- und Meßspannungsimpulse, die an den Glühund Ionenstrommeßkerzen der einzelnen Zylinder jeweils liegen in Addition über etwa 280° des Kurbelwellenwinkels erstrecken.It can also be seen from the drawing that the annealing voltage and measuring voltage pulses which respectively lie on the glow and Ionenstrommeßkerzen the individual cylinders in addition over about 280 ° of the crankshaft angle.

Aufgrund der niedrigen Nominalspannung der Glüh- und Ionenstrommeßkerzen muß nicht über die gesamte Zeit außerhab des Ionenstrommeßfensters geglüht werden, so daß dadurch automatisch eine zeitliche Verteilung der Spannungsbeaufschlagungsperioden der Glüh- und Ionenstrommeßkerzen erreicht wird, die die Bordnetzbelastung und dementsprechend Bordnetzschwankungen möglichst gering hält.Due to the low nominal voltage of the incandescent and Ionenstrommeßkerzen must not be annealed over the entire time Außerhab the Ionenstrommeßfensters, thereby automatically a temporal distribution of Spannungsbeaufschlagungsperioden the annealing and Ionenstrommeßkerzen is achieved, which keeps the electrical system load and, accordingly, wiring system fluctuations as low as possible.

Die Vorteile derartiger Glüh- und Ionenstrommeßvorrichtungen liegen unter anderem in der geringeren Leistungsaufnahme der einzelnen Glüh- und Ionenstrommeßkerzen sowie der Möglichkeit einer besseren Nachführung der Glühspannung an den momentanen Motorbetriebszustand, beispielsweise die Drehzahl, die Einspritzmenge, die Temperatur, die zeitliche Lage des Verbrennungsvorganges usw. Dadurch kann die Temperatur der Glüh- und Ionenstrommeßkerzen besser an die Erfordernisse des Motors angepaßt werden, als es bisher möglich war.The advantages of such incandescent and Ionenstrommeßvorrichtungen include the lower power consumption of the individual incandescent and Ionenstrommeßkerzen and the possibility of better tracking of the annealing voltage to the current engine operating condition, such as the speed, the injection quantity, the temperature, the timing of the combustion process, etc. As a result, the temperature of the glow and Ionenstrommeßkerzen be better adapted to the requirements of the engine, as previously possible was.

Mit den oben beschriebenen Glüh- und Ionenstrommeßvorrichtungen können Ionenstromsignale bei gleichzeitig voller Funktionsfähigkeit des Glühbetriebes, beispielsweise als Kaltstarthilfe, gemessen werden. Dabei ist eine Betriebsweise möglich, bei der zum erwarteten Zündzeitpunkt die höchstmögliche Temperatur an der Glüh- und Ionenstrommeßkerze zur Verfügung steht.With the above-described annealing and Ionenstrommeßvorrichtungen ion current signals can be measured at the same time full functionality of the annealing operation, for example as a cold start help. In this case, an operating mode is possible in which the highest possible temperature at the ignition and Ionenstrommeßkerze available at the expected ignition timing.

Claims (7)

  1. Method for operating a glow and ion current measurement device, for a diesel engine with a respective glow and ion current measurement plug provided for each cylinder or for some individual cylinders, to which plug, over the whole crankshaft angle range, a glow voltage is applied in glow operation and a measurement voltage is applied in measurement operation, the glow voltage and measurement voltage each being clocked over a partial crankshaft angle range and being applied synchronously with the combustion processes in the combustion chamber of the cylinder of the diesel engine, characterised in that the clocking of the measurement voltage and glow voltage takes place in such a way that the actual value of the glow voltage over the whole crankshaft angle range corresponds to the nominal voltage at which the glow and ion current measurement plug reaches its set temperature.
  2. Method according to claim 1, characterised in that the glow voltage and the measurement voltage are applied to the glow and ion current measurement plug of a cylinder, over respective mutually adjacent partial crankshaft angle ranges.
  3. Method according to claim 1, characterised in that the glow voltage and the measurement voltage are applied to the glow and ion current measurement plug of a cylinder, in the form of a glow voltage pulse and a measurement voltage pulse.
  4. Method according to claim 3, characterised in that the glow voltage pulse and the measurement voltage pulse which are each applied to the glow and ion current measurement plug of a cylinder do not overlap.
  5. Method according to either claim 3 or claim 4, characterised in that the glow voltage pulse and the measurement voltage pulse which are applied to the glow and ion measurement plugs of two different cylinders overlap.
  6. Method according to claim 1, characterised in that the beginning of the measurement voltage clock cycle is synchronised with the beginning of the ignition or combustion in the cylinder of the diesel engine.
  7. Method according to claim 1, characterised in that the glow voltage is applied until shortly before the expected ignition point.
EP02027416A 2001-12-18 2002-12-09 Glow and ion current measuring device for a Diesel engine Expired - Lifetime EP1329630B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10162253 2001-12-18
DE10162253A DE10162253A1 (en) 2001-12-18 2001-12-18 Glow and ion current measurement device for diesel engine has controller that clocks glow and measurement voltages and applies to plug synchronously with combustion processes

Publications (3)

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EP1329630A2 EP1329630A2 (en) 2003-07-23
EP1329630A3 EP1329630A3 (en) 2006-03-01
EP1329630B1 true EP1329630B1 (en) 2008-04-02

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EP02027416A Expired - Lifetime EP1329630B1 (en) 2001-12-18 2002-12-09 Glow and ion current measuring device for a Diesel engine

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EP (1) EP1329630B1 (en)
AT (1) ATE391233T1 (en)
DE (2) DE10162253A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004029006B3 (en) 2004-06-16 2005-04-07 Daimlerchrysler Ag Signal evaluation method for ion current measurement in diesel engine uses filtering via transmission function for effective ion current measurement upon soiling of glow and ion current measuring plug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6483079B2 (en) 1996-04-10 2002-11-19 Denso Corporation Glow plug and method of manufacturing the same, and ion current detector
EP0809021B1 (en) * 1996-05-21 2005-01-19 Alcoa Fujikura Gesellschaft mit beschränkter Haftung Glow plug preheating control method and device for diesel engine
JP3796846B2 (en) 1996-09-12 2006-07-12 株式会社デンソー Glow plug
JP3605965B2 (en) 1996-09-12 2004-12-22 株式会社デンソー Glow plug
JP3475732B2 (en) 1997-07-30 2003-12-08 トヨタ自動車株式会社 Device for detecting combustion state of internal combustion engine
WO1999031384A1 (en) * 1997-12-12 1999-06-24 Temic Telefunken Microelectronic Gmbh Method for measuring ionic current in internal combustion engines and device for measuring ionic current
JP2001336468A (en) * 2000-03-22 2001-12-07 Ngk Spark Plug Co Ltd Glow plug control device, grow plug, and detecting method of ion inside engine combustion chamber

Also Published As

Publication number Publication date
EP1329630A2 (en) 2003-07-23
ATE391233T1 (en) 2008-04-15
EP1329630A3 (en) 2006-03-01
DE10162253A1 (en) 2003-07-10
DE50212013D1 (en) 2008-05-15

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