EP0635638A2 - Circuit for flame detection - Google Patents

Circuit for flame detection Download PDF

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Publication number
EP0635638A2
EP0635638A2 EP94109218A EP94109218A EP0635638A2 EP 0635638 A2 EP0635638 A2 EP 0635638A2 EP 94109218 A EP94109218 A EP 94109218A EP 94109218 A EP94109218 A EP 94109218A EP 0635638 A2 EP0635638 A2 EP 0635638A2
Authority
EP
European Patent Office
Prior art keywords
ignition
circuit
coil
primary winding
flame
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.)
Granted
Application number
EP94109218A
Other languages
German (de)
French (fr)
Other versions
EP0635638A3 (en
EP0635638B1 (en
Inventor
Odd Peters
Dieter Teutsch
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.)
BorgWarner Ludwigsburg GmbH
Original Assignee
BERU RUPRECHT GmbH and Co KG
BERU Ruprecht GmbH and Co KG
Beru Werk Albert Ruprecht GmbH and Co KG
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
Priority claimed from DE4324863A external-priority patent/DE4324863C2/en
Application filed by BERU RUPRECHT GmbH and Co KG, BERU Ruprecht GmbH and Co KG, Beru Werk Albert Ruprecht GmbH and Co KG filed Critical BERU RUPRECHT GmbH and Co KG
Publication of EP0635638A2 publication Critical patent/EP0635638A2/en
Publication of EP0635638A3 publication Critical patent/EP0635638A3/en
Application granted granted Critical
Publication of EP0635638B1 publication Critical patent/EP0635638B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q3/00—Igniters using electrically-produced sparks
    • F23Q3/004—Using semiconductor elements
    • 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
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/05—Layout of circuits for control of the magnitude of the current in the ignition coil
    • F02P3/051—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/053—Opening or closing the primary coil circuit with semiconductor devices using digital techniques
    • 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
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
    • 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
    • F02P2017/123—Generating additional sparks for diagnostics
    • 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
    • F02P2017/126—Measuring ionisation of combustion gas, e.g. by using ignition circuits for burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage

Definitions

  • the invention relates to a circuit arrangement for flame detection for a transistor coil ignition of a burner, which has a control stage which controls a power transistor located in the circuit of the primary winding of an ignition coil.
  • a transistor coil ignition the construction and mode of operation of which are known per se, is provided as an ignition device in burners operated with gas, diesel fuel, gasoline or other fuels. It is desirable to monitor the burner flame, ie to provide flame detection and ignition diagnosis.
  • the object on which the invention is based is to design the circuit arrangement of the type mentioned at the beginning in such a way that reliable detection of the flame is possible with less circuitry complexity.
  • the circuit arrangement according to the invention allows the entire transistor coil ignition, in which it is provided, to be designed simply and compactly in the form of a complete device.
  • the development specified in claim 6 allows an additional diagnosis for the detection of shunt and interruption as well as short circuit of the ignition system in the ignition phase, in addition to the flame detection in the flame detection phase.
  • a conventional transistor coil ignition is shown in a block diagram, which is provided with an embodiment of the circuit arrangement according to the invention for flame detection.
  • the transistor coil ignition consists of an ignition coil ZS, a power transistor Tr2 with a Zener diode ZD1 for voltage limitation and a current sensor R2 for current detection.
  • the control stage of the transistor coil ignition is formed from a comparator K1, at the input of which one of two current setpoints Isoll1 and Isoll2 is used, which are used for control during any ignition phase and during any flame detection phase.
  • the respective time periods for these two phases are determined by a timing element ZG1, which switches a switch S1 with two contacts for the two current setpoints, so that, depending on the switch position, a corresponding current setpoint is at the input of the comparator K1. Due to this training, simultaneous ignition and flame detection is not possible.
  • At the second input of the comparator K1 is the actual current value of the current flowing through the primary winding of the ignition coil ZS when the power transistor Tr2 is switched on, which current is detected by the current sensor R2 and is in the form of a resistor Has.
  • the comparator K1 controls a flip-flop FF1 with a clock input CP, the non-inverting output Q of which lies at a driver stage, in the present case from transistors Tr1a and Tr1b connected in push-pull.
  • the power transistor Tr2 is driven via the driver stage in order to charge the primary winding of the ignition coil ZS.
  • the current setpoint Isoll1 While in the ignition phase, the current setpoint Isoll1 is at the comparator K1, so that the current flow through the primary winding of the ignition coil ZS is sufficient to trigger an ignition spark at the spark gap FS, i.e. when the power transistor Tr2 is blocked.
  • the current setpoint Isoll2 at the comparator K1 which is below the current setpoint Isoll1 and ensures a current flow through the primary winding of the ignition coil ZS, which is reduced to such an extent that there is no sparkover at the electrodes non-conductive media e.g. Air or a gas mixture can be done.
  • the spark gap FS If, however, a flame is present on the spark gap FS, the spark gap FS is ionized and thus in a conductive state, so that a sparkover occurs, since no ionization work has to be carried out by the voltage on the spark gap FS.
  • the amplitude of the pulses occurring on the secondary side of the ignition coil ZS, ie on the spark gap FS, should be set as a function of the length of the spark gap FS, ie the electrode spacing and / or the flow velocity of the gas mixture and / or the flame velocity. At higher speeds there is an expansion of the ionization channel, which increases the Electrode distance corresponds to the conditions when the gas mixture is at rest.
  • This setting can be made via a corresponding choice of the level of the value IS0112 on the comparator K1, which is possible, for example, by means of a generator which supplies a variable voltage, for example a ramp generator instead of the switch S1.
  • a sparkover is monitored by a flame detection device which, according to FIG. 1, consists of a rectifier Glr1, a memory element in the form of an RC element R3, C2 and a comparator K2, which detects the signal from the primary winding of the ignition coil ZS after blocking the power transistor Tr2 Evaluates the presence of a flame in the flame detection phase.
  • a flame detection device which, according to FIG. 1, consists of a rectifier Glr1, a memory element in the form of an RC element R3, C2 and a comparator K2, which detects the signal from the primary winding of the ignition coil ZS after blocking the power transistor Tr2 Evaluates the presence of a flame in the flame detection phase.
  • the signal present at the cathode of the diode D1 is integrated via the RC element R3, C2 and evaluated via the comparator K2 by means of a comparison with a setpoint value at the other input of the comparator K2.
  • an ignition diagnosis device ZüD1 can also be provided, which checks the ignition system for shunt and interruption on the secondary high-voltage side in the ignition phase.
  • Such an ignition diagnosis device is known per se.
  • the reference value Isoll1 is at the comparator K1. That means the ignition is in the ignition phase, the duration of which is determined by the timer ZG1. In this ignition phase, in addition to the ignition, there is a simultaneous ignition diagnosis via the ignition diagnosis device ZüD1 so that the spark gap FS is examined for interruptions and shunt of the electrodes.
  • the timing element ZG1 switches the reference value Isoll2 to the comparator K1 via the switch S1.
  • the primary charging current of the ignition coil ZS detected by the current sensor R2 is reduced to such an extent that no flashover can take place on the spark gap FS without a flame.
  • points A and B in the circuit diagram of FIG. 1 there are signals with the course shown in FIG. 2.
  • the stress on the ignition coil ZS that occurs when a flame is present cannot be caused by a sparkover at the spark gap FS as a result of the explain ionizing work, so that the energy required for the sparkover is much lower than with non-ionized and non-conductive media such as air or other gas mixtures.
  • the signal present at point A with or without pulse peaks (FIG. 3, FIG. 4) is rectified via the rectifier Glr1 and smoothed via the integrator R3, C2.
  • the smoothed voltage is applied to the comparator K2, which compares it with a reference voltage USOLL.
  • Uout Depending on the signal state at point A, there is an output signal Uout from comparator K2, which leads to a corresponding display on display device A1.
  • the error signal thus formed can be used for further processing.
  • FIG. 5 shows the schematic circuit diagram of a further exemplary embodiment of the circuit arrangement according to the invention, which differs from the exemplary embodiment illustrated in FIG. 1 on the one hand by the design of the circuit device which, in the flame detection phase, limits the charging current flowing via the primary winding of the ignition coil ZS to a current intensity , which is below the charging current required to generate a spark in the ignition phase.
  • this circuit device consisted of a timer ZG and a switch S1 actuated by the timer ZG
  • this circuit device is formed by a ramp generator RG1, the output voltage of which is in the form of a Irp at the comparator K1.
  • the embodiment shown in Fig. 5 Circuit arrangement according to the invention also differs from the exemplary embodiment shown in FIG. 1 in that the value Iactual, that is to say the actual current value of the current flowing via the primary winding of the ignition coil ZS when the power transistor Tr2 is switched through, not only at the input of the comparator K1 but also on a display device designed as a signal evaluation device A1 lies.
  • Iactual that is to say the actual current value of the current flowing via the primary winding of the ignition coil ZS when the power transistor Tr2 is switched through
  • the embodiment shown in FIG. 5 is particularly suitable for making a statement about the flow velocity of the flame or the gas mixture in the combustion chamber via the amplitude of the flame detection pulses.
  • pulses are switched to the spark gap FS with increasing voltage amplitude. This is achieved via the ramp generator RG1, whose output voltage increases linearly with time.
  • the ramp generator RG1 whose output voltage increases linearly with time.
  • pulses with increasing amplitude are then generated on the secondary side of the ignition coil ZS. Since the ionization channel, i.e. the actual spark gap FS increases at higher speeds of the gas mixture or at higher flame speeds, the height of the amplitude of the pulses at the spark gap FS, which is necessary in order to cause a flashover, provides information about the flame or gas mixture speed.
  • the evaluation circuit supplies the signal Uout from the rectifier Glr1, the integration element R3, C2 via the comparator K2, which signal is present at the display device A1.
  • the value of the primary charging current Iact which at this point in time, ie at the point in time at which the signal Uout occurs at the comparator K2, is likewise on the display device A1.
  • the display device A1 is designed as a signal processing device so that the input values are stored and as a measure for the speed of the flame or the gas mixture can be evaluated and used.
  • the embodiment of the circuit arrangement according to the invention shown in FIG. 5 thus offers the further possibility, compared to the embodiment shown in FIG. 1, not only to carry out a flame detection but also to obtain information about the speed of the flame or of the gas mixture to be ignited.
  • spark gap FS is also examined in the flame detection phase for an interruption in the high-voltage connections, which is also possible with the flame detection via the either loaded or unloaded ignition coil ZS.
  • the circuit arrangement described above can be produced inexpensively, but it nevertheless offers the possibility of reliable flame detection and an additional ignition diagnosis in order to rule out fault detections.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Control Of Combustion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

Circuit for flame detection for a transistor coil ignition of a burner. The transistor coil ignition has a driving stage which drives a power transistor (Tr2) located in the circuit of the primary winding of an ignition coil (ZS) in order to charge the primary winding of the ignition coil (ZS) with a charge current from a power supply. A switching device (ZG1, S1) is provided with an ignition and flame detection device which in the flame detection position limits the charge current flowing across the primary winding of the ignition coil (ZS) to a level which lies below that which is necessary to produce an ignition spark in the ignition position so that without a flame an ignition flashover cannot take place. An evaluation circuit (Glr1, R3, C2, K2) evaluates the signal, occurring after the disconnection of the charge current flowing across the primary winding of the ignition coil (ZS), from the primary winding of the ignition coil (ZS), this signal having pulse peaks when the flame is absent and no such pulse peaks when the flame is present. The evaluation takes place preferably at a display signal which is present at a display device (A1) in order to display the presence and absence of a flame in the burner. <IMAGE>

Description

Die Erfindung betrifft eine Schaltungsanordnung zur Flammerkennung für eine Transistorspulenzündung eines Brenners, die eine Ansteuerstufe aufweist, die einen im Stromkreis der Primärwicklung einer Zündspule liegenden Leistungstransistor ansteuert.The invention relates to a circuit arrangement for flame detection for a transistor coil ignition of a burner, which has a control stage which controls a power transistor located in the circuit of the primary winding of an ignition coil.

Eine Transistorspulenzündung, deren Aufbau und Arbeitsweise an sich bekannt sind, wird als Zündvorrichtung bei mit Gas, Dieselkraftstoff, Benzin oder anderen Brennstoffen betriebenen Brennern vorgesehen. Es ist dabei erwünscht, die Brennerflamme zu überwachen, d.h. eine Flammerkennung und Zünddiagnose vorzusehen.A transistor coil ignition, the construction and mode of operation of which are known per se, is provided as an ignition device in burners operated with gas, diesel fuel, gasoline or other fuels. It is desirable to monitor the burner flame, ie to provide flame detection and ignition diagnosis.

Aus der DE-OS 3706555 ist es bekannt, zur Flammüberwachung einer Zündeinrichtung in Form einer Glühkerze mit einem Glühkerzenkörper eine Ionisationselektrode vorzusehen, die in die Glühkerze integriert ist. Bei dieser bekannten Flammüberwachung ist ein zusätzlicher Schaltungsaufwand zur Ansteuerung notwendig, wobei weiterhin die Zünddiagnose schwierig ist und sich die Signalauswertung als störanfällig erweist. Von der fertigungstechnischen Sicht ergibt sich darüberhinaus ein zusätzlicher konstruktiver Aufwand.From DE-OS 3706555 it is known to provide an ionization electrode which is integrated in the glow plug for flame monitoring of an ignition device in the form of a glow plug with a glow plug body. In this known flame monitoring, additional circuitry is required for activation, the ignition diagnosis still being difficult and the signal evaluation proving to be susceptible to faults. From the point of view of production technology, there is also an additional design effort.

Aus der DE-OS 4107335 sind darüberhinaus ein Verfahren und eine Vorrichtung zur Zündüberwachung einer Zündanlage bekannt, mit denen die Zündanlage auf Nebenschluß und Unterbrechung auf der sekundären Hochspannungsseite überprüft werden kann. Dazu wird in der Zündungsphase eine Zünddiagnose durchgeführt.From DE-OS 4107335 a method and a device for ignition monitoring of an ignition system are also known, with which the ignition system can be checked for shunt and interruption on the secondary high-voltage side. For this purpose, an ignition diagnosis is carried out in the ignition phase.

Die der Erfindung zugrunde liegende Aufgabe besteht demgegenüber darin die Schaltungsanordnung der eingangs genannten Art so auszubilden, daß eine sichere Erkennung der Flamme bei geringerem schaltungstechnischen Aufwand möglich ist.The object on which the invention is based, on the other hand, is to design the circuit arrangement of the type mentioned at the beginning in such a way that reliable detection of the flame is possible with less circuitry complexity.

Diese Aufgabe wird gemäß der Erfindung durch die Ausbildung gelöst, die im kennzeichnenden Teil des Anspruchs 1 angegeben ist.This object is achieved according to the invention by the training specified in the characterizing part of claim 1.

Aufgrund dieser Ausbildung erlaubt es die erfindungsgemäße Schaltungsanordnung, die gesamte Transistorspulenzündung, bei der sie vorgesehen ist, einfach und kompakt in Form eines kompletten Gerätes auszubilden.Because of this design, the circuit arrangement according to the invention allows the entire transistor coil ignition, in which it is provided, to be designed simply and compactly in the form of a complete device.

Besonders bevorzugte Ausgestaltungen und Weiterbildungen der erfindungsgemäßen Schaltungsanordnung sind Gegenstand der Ansprüche 2 bis 6.Particularly preferred refinements and developments of the circuit arrangement according to the invention are the subject of claims 2 to 6.

Insbesondere die im Anspruch 6 angegebene Weiterbildung erlaubt eine zusätzliche Diagnose zur Erkennung von Nebenschluß und Unterbrechung sowie Kurzschluß der Zündanlage in der Zündphase und zwar zusätzlich zu der Flammerkennung in der Flammerkennungsphase.In particular, the development specified in claim 6 allows an additional diagnosis for the detection of shunt and interruption as well as short circuit of the ignition system in the ignition phase, in addition to the flame detection in the flame detection phase.

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

  • Fig. 1 ein schematisches Schaltbild eines Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung,
  • Fig. 2 bis 4 in Zeitdiagrammen die Signalverläufe von an bestimmten Punkten der in Fig. 1 dargestellten Schaltungsanordnung auftretenden Signalen und
  • Fig. 5 ein schematisches Schaltbild eines weiteren Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung.
Particularly preferred exemplary embodiments of the invention are described in more detail below with reference to the accompanying drawing. Show it
  • 1 is a schematic circuit diagram of an embodiment of the circuit arrangement according to the invention,
  • 2 to 4 in time diagrams the signal curves of signals occurring at certain points in the circuit arrangement shown in FIG. 1 and
  • 5 shows a schematic circuit diagram of a further exemplary embodiment of the circuit arrangement according to the invention.

In Fig. 1 ist in einem Blockschaltbild eine herkömliche Transistorspulenzündung dargestellt, die mit einem Ausführungsbeispiel der erfindungsgemäßen Schaltungsanordnung zur Flammerkennung versehen ist.In Fig. 1, a conventional transistor coil ignition is shown in a block diagram, which is provided with an embodiment of the circuit arrangement according to the invention for flame detection.

Die Transistorspulenzündung besteht aus einer Zündspule ZS, einem Leistungstransistor Tr2 mit einer Z-Diode ZD1 zur Spannungsbegrenzung sowie einem Stromsensor R2 zur Stromerfassung. Die Ansteuerstufe der Transistorspulenzündung ist bei dem in Fig. 1 dargestellten Ausführungsbeispiel aus einem Komparator K1 gebildet, an dessen einem Eingang einer von zwei Stromsollwerten Isoll1 und Isoll2 liegt die für die Ansteuerung während einer beliebig langen Zündphase und während einer beliebig langen Flammerkennungsphase dienen. Die jeweiligen Zeiträume für diese beiden Phasen sind durch ein Zeitglied ZG1 bestimmt, das einen Schalter S1 mit zwei Kontakten für die beiden Stromsollwerte schaltet, so daß je nach Schalterstellung ein entsprechender Stromsollwert am Eingang des Komparators K1 liegt. Aufgrund dieser Ausbildung ist ein gleichzeitiges Zünden und Flammerkennen nicht möglich.The transistor coil ignition consists of an ignition coil ZS, a power transistor Tr2 with a Zener diode ZD1 for voltage limitation and a current sensor R2 for current detection. In the exemplary embodiment shown in FIG. 1, the control stage of the transistor coil ignition is formed from a comparator K1, at the input of which one of two current setpoints Isoll1 and Isoll2 is used, which are used for control during any ignition phase and during any flame detection phase. The respective time periods for these two phases are determined by a timing element ZG1, which switches a switch S1 with two contacts for the two current setpoints, so that, depending on the switch position, a corresponding current setpoint is at the input of the comparator K1. Due to this training, simultaneous ignition and flame detection is not possible.

Am zweiten Eingang des Komparators K1 liegt der Stromistwert des über die Primärwicklung der Zündspule ZS bei durchgeschaltetem Leistungstransistor Tr2 fließenden Stromes, der vom Stromsensor R2 erfaßt wird, der die Form eines Widerstandes hat.At the second input of the comparator K1 is the actual current value of the current flowing through the primary winding of the ignition coil ZS when the power transistor Tr2 is switched on, which current is detected by the current sensor R2 and is in the form of a resistor Has.

Der Komparator K1 steuert ein Flip-Flop FF1 mit einem Takteingang CP an, dessen nichtinvertierender Ausgang Q an einer Treiberstufe, im vorliegenden Fall aus in Gegentakt geschalteten Transistoren Tr1a und Tr1b liegt. Der Leistungstransistor Tr2 wird über die Treiberstufe angesteuert, um die Primärwicklung der Zündspule ZS zu laden.The comparator K1 controls a flip-flop FF1 with a clock input CP, the non-inverting output Q of which lies at a driver stage, in the present case from transistors Tr1a and Tr1b connected in push-pull. The power transistor Tr2 is driven via the driver stage in order to charge the primary winding of the ignition coil ZS.

Arbeitsweise und Aufbau einer derartigen Transistorspulenzündung im einzelnen sind an sich bekannt und werden deshalb nicht näher erläutert.The mode of operation and structure of such a transistor coil ignition are known per se and are therefore not explained in more detail.

Während in der Zündphase am Komparator K1 der Stromsollwert Isoll1 liegt, so daß der Stromfluß über die Primärwicklung der Zündspule ZS ausreicht, um beim Sperren des Leistungstransistors Tr2 einen Zündfunken an der Funkenstrecke FS, d.h. an den Elektroden oder der Zündkerze zu erzeugen, liegt in der Flammerkennungsphase der Stromsollwert Isoll2 am Komparator K1, der unter dem Stromsollwert Isoll1 liegt und für einen Stromfluß über die Primärwicklung der Zündspule ZS sorgt, der soweit reduziert ist, daß an den Elektroden kein Funkenüberschlag in nichtleitenden Medien z.B. Luft oder einem Gasgemisch erfolgen kann.While in the ignition phase, the current setpoint Isoll1 is at the comparator K1, so that the current flow through the primary winding of the ignition coil ZS is sufficient to trigger an ignition spark at the spark gap FS, i.e. when the power transistor Tr2 is blocked. To generate on the electrodes or the spark plug, in the flame detection phase is the current setpoint Isoll2 at the comparator K1, which is below the current setpoint Isoll1 and ensures a current flow through the primary winding of the ignition coil ZS, which is reduced to such an extent that there is no sparkover at the electrodes non-conductive media e.g. Air or a gas mixture can be done.

Falls allerdings an der Funkenstrecke FS eine Flamme vorhanden ist, so ist die Funkenstrecke FS ionisiert und somit in leitfähigem Zustand, so daß dennoch ein Funkenüberschlag auftritt, da keine Ionisierungsarbeit durch die Spannung an der Funkenstrecke FS verrichtet werden muß.If, however, a flame is present on the spark gap FS, the spark gap FS is ionized and thus in a conductive state, so that a sparkover occurs, since no ionization work has to be carried out by the voltage on the spark gap FS.

Die Amplitude der an der Sekundärseite der Zündspule ZS, d.h. an der Funkenstrecke FS auftretenden Impulse sollte in Abhängigkeit von der Länge der Funkenstrecke FS d.h. des Elektrodenabstandes und/oder der Strömungsgeschwindigkeit des Gasgemisches und/oder der Flammengeschwindigkeit eingestellt werden. Bei höheren Geschwindigkeiten ergibt sich nämlich eine Aufweitung des Ionisationskanals, was einer Erhöhung des Elektrodenabstandes gegenüber den Verhältnissen bei ruhendem Gasgemisch entspricht. Diese Einstellung kann über eine entsprechende Wahl der Höhe des Wertes IS0112 am Komparator K1 erfolgen, was beispielsweise mittels eines eine variable Spannung liefernden Generators, beispielsweise eines Rampengenerators statt des Schalters S1 möglich ist.The amplitude of the pulses occurring on the secondary side of the ignition coil ZS, ie on the spark gap FS, should be set as a function of the length of the spark gap FS, ie the electrode spacing and / or the flow velocity of the gas mixture and / or the flame velocity. At higher speeds there is an expansion of the ionization channel, which increases the Electrode distance corresponds to the conditions when the gas mixture is at rest. This setting can be made via a corresponding choice of the level of the value IS0112 on the comparator K1, which is possible, for example, by means of a generator which supplies a variable voltage, for example a ramp generator instead of the switch S1.

Ein Funkenüberschlag wird über eine Flammenerkennungseinrichtung überwacht, die gemäß Fig. 1 aus einem Gleichrichter Glr1, einem Speicherglied in Form eines RC Gliedes R3, C2 sowie einem Komparator K2 besteht, die das Signal von der Primärwicklung der Zündspule ZS nach Sperren des Leistungstransistors Tr2 auf das Vorliegen einer Flamme in der Flammerkennungsphase auswertet.A sparkover is monitored by a flame detection device which, according to FIG. 1, consists of a rectifier Glr1, a memory element in the form of an RC element R3, C2 and a comparator K2, which detects the signal from the primary winding of the ignition coil ZS after blocking the power transistor Tr2 Evaluates the presence of a flame in the flame detection phase.

Das dabei anstehende Signal an der Kathode der Diode D1 wird über das RC Glied R3, C2 integriert und über den Komparator K2 mittels eines Vergleiches mit einem am anderen Eingang des Komparators K2 liegenden Sollwert ausgewertet.The signal present at the cathode of the diode D1 is integrated via the RC element R3, C2 and evaluated via the comparator K2 by means of a comparison with a setpoint value at the other input of the comparator K2.

Um eine fehlerfreie Erkennung der Flamme sowie eine zuverlässige Aussage über die Funktion der Zündung zu erhalten, kann zusätzlich eine Zünddiagnoseeinrichtung ZüD1 vorgesehen sein, die in der Zündphase die Zündanlage auf Nebenschluß und Unterbrechung auf der sekundären Hochspannungsseite überprüft. Eine derartige Zünddiagnoseeinrichtung ist an sich bekannt.In order to obtain error-free detection of the flame and reliable information about the function of the ignition, an ignition diagnosis device ZüD1 can also be provided, which checks the ignition system for shunt and interruption on the secondary high-voltage side in the ignition phase. Such an ignition diagnosis device is known per se.

Tritt in der Zünd- oder in der Flammerkennungsphase ein Fehler auf, so wird das an einer Anzeigeeinrichtung A1 angezeigt und zur Kenntnis gebracht, an der die Ausgangssignale des Komparators K2 für die Flammerkennung sowie der Zünddiagnoseeinrichtung ZüD1 liegen.If an error occurs in the ignition or flame detection phase, this is displayed and brought to the attention on a display device A1 on which the output signals of the comparator K2 for the flame detection and the ignition diagnosis device ZüD1 are located.

Im folgenden wird anhand der Figuren 2 bis 4 die Arbeitsweise des oben beschriebenen Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung im einzelnen erläutert.The mode of operation of the exemplary embodiment of the circuit arrangement according to the invention described above is explained in detail below with reference to FIGS. 2 to 4.

Bei Anschalten der Batteriespannung +Ub liegt am Komparator K1 der Referenzwert Isoll1. Das bedeutet, daß sich die Zündung in der Zündphase befindet, deren Dauer durch das Zeitglied ZG1 bestimmt ist. In dieser Zündphase erfolgt neben der Zündung eine gleichzeitige Zünddiagnose über die Zünddiagnoseeinrichtung ZüD1 so daß die Funkenstrecke FS auf Unterbrechungen und Nebenschluß der Elektroden untersucht wird.When the battery voltage + Ub is switched on, the reference value Isoll1 is at the comparator K1. That means the ignition is in the ignition phase, the duration of which is determined by the timer ZG1. In this ignition phase, in addition to the ignition, there is a simultaneous ignition diagnosis via the ignition diagnosis device ZüD1 so that the spark gap FS is examined for interruptions and shunt of the electrodes.

Nach Ablauf der Zündphase schaltet das Zeitglied ZG1 über den Schalter S1 den Referenzwert Isoll2 an den Komparator K1. Dadurch wird der vom Stromsensor R2 erfaßte Primärladestrom der Zündspule ZS soweit reduziert, daß an der Funkenstrecke FS ohne Flamme kein Überschlag erfolgen kann. An den Punkten A und B im Schaltbild von Fig. 1 liegen dann Signale mit dem in Fig. 2 dargestellten Verlauf.After the ignition phase, the timing element ZG1 switches the reference value Isoll2 to the comparator K1 via the switch S1. As a result, the primary charging current of the ignition coil ZS detected by the current sensor R2 is reduced to such an extent that no flashover can take place on the spark gap FS without a flame. At points A and B in the circuit diagram of FIG. 1 there are signals with the course shown in FIG. 2.

Beim Abschalten des Stromes durch ein Sperren des Leistungstransistors Tr2 treten am Punkt A Halbschwingungen auf, wie sie in Fig. 3 dargestellt sind. Ursächlich werden diese Halbschwingungen durch die negativen nach Masse geleiteten Schwingungsanteile über der Kollektoremitterstreckendiode des Transistors Tr2 erzeugt. Das heißt mit anderen Worten, daß an der Kathode der Diode D1 positive Impulse anstehen, wie sie in Fig. 3 dargestellt sind.When the current is switched off by blocking the power transistor Tr2, half-oscillations occur at point A, as shown in FIG. 3. These half-oscillations are caused by the negative oscillation components, which are conducted to ground, via the collector-emitter section diode of the transistor Tr2. In other words, this means that positive pulses are present at the cathode of the diode D1, as shown in FIG. 3.

Wird nun der Sekundärkreis der Zündspule ZS über die Funkenstrecke FS durch einen erfolgten Überschlag belastet, der in der Flammerkennungsphase nur dann auftritt, wenn eine Flamme vorhanden ist, d. h. wenn die Funkenstrecke durch eine Flamme ionisiert ist, dann wird von der im Magnetkreis der Zündspule ZS gespeicherten Energie ein Teil verbraucht. Das hat zur Folge, daß die Abschaltspannungswerte am Transistor Tr2 wesentlich geringer als ohne eine Flamme sind und die Kollektoremitterstreckendiode des Transistors Tr2 nicht mehr in den leitendend Zustand versetzt wird.If the secondary circuit of the ignition coil ZS over the spark gap FS is loaded by a flashover, which only occurs in the flame detection phase if a flame is present, i. H. if the spark gap is ionized by a flame, part of the energy stored in the magnetic circuit of the ignition coil ZS is consumed. The result of this is that the switch-off voltage values at transistor Tr2 are substantially lower than without a flame and the collector-emitter line diode of transistor Tr2 is no longer brought into the conductive state.

Physikalisch läßt sich die beim Vorhandensein einer Flamme auftretende Belastung der Zündspule ZS durch einen Funkenüberschlag an der Funkenstrecke FS infolge der nicht zu verrichtenden Ionisierungsarbeit erklären, so daß der Energiebedarf für den Funkenüberschlag wesentlich geringer als bei nichtionisierten und nichtleitenden Medien wie z.B. Luft oder anderen Gasgemischen ist.Physically, the stress on the ignition coil ZS that occurs when a flame is present cannot be caused by a sparkover at the spark gap FS as a result of the explain ionizing work, so that the energy required for the sparkover is much lower than with non-ionized and non-conductive media such as air or other gas mixtures.

Aufgrund dieser Belastung der Zündspule ZS beim Vorliegen einer Flamme und den dadurch bedingten geringeren Abschaltspannungswerten am Transistor Tr2 stehen keine Impulse am Punkt A sowie an der Diode D1 an, wie es in Figur 4 dargestellt ist.Because of this load on the ignition coil ZS when there is a flame and the resulting lower cut-off voltage values at the transistor Tr2, there are no pulses at point A or at the diode D1, as shown in FIG.

Das am Punkt A anliegende Signal mit oder ohne Impulsspitzen (Fig. 3, Fig. 4) wird über den Gleichrichter Glr1 gleichgerichtet und über das Integrierglied R3, C2 geglättet. Die geglättete Spannung liegt am Komparator K2, der diese mit einer Bezugsspannung USOLL vergleicht. Je nach Signalzustand am Punkt A ergibt sich ein Ausgangssignal Uout vom Komparator K2, das zu einer entsprechenden Anzeige an der Anzeigeeinrichtung A1 führt. Das dabei gebildete Fehlersignal kann zur weiteren Verarbeitung verwendet werden.The signal present at point A with or without pulse peaks (FIG. 3, FIG. 4) is rectified via the rectifier Glr1 and smoothed via the integrator R3, C2. The smoothed voltage is applied to the comparator K2, which compares it with a reference voltage USOLL. Depending on the signal state at point A, there is an output signal Uout from comparator K2, which leads to a corresponding display on display device A1. The error signal thus formed can be used for further processing.

Fig. 5 zeigt das schematische Schaltbild eines weiteren Ausführungsbeispiels der erfindungsgemäßen Schaltungsanordnung, das sich von dem in Fig. 1 dargestellten Ausführungsbeispiel zum einen durch die Ausbildung der Schaltungseinrichtung unterscheidet, die in der Flammerkennungsphase den über die Primärwicklung der Zündspule ZS fließenden Ladestrom auf eine Stromstärke begrenzt, die unter der für die Erzeugung eines Zündfunkens in der Zündphase notwendigen Ladestromstärke liegt. Während bei dem in Fig. 1 dargestellten Ausführungsbeispiel diese Schaltungs-einrichtung aus einem Zeitglied ZG und einem durch das Zeitglied ZG betätigten Schalter S1 bestand, wird bei dem in Fig. 5 dargestellten Ausführungsbeispiel diese Schaltungseinrichtung von einem Rampengenerator RG1 gebildet, dessen Ausgangsspannung in Form eines Wertes Irp am Komparator K1 liegt.FIG. 5 shows the schematic circuit diagram of a further exemplary embodiment of the circuit arrangement according to the invention, which differs from the exemplary embodiment illustrated in FIG. 1 on the one hand by the design of the circuit device which, in the flame detection phase, limits the charging current flowing via the primary winding of the ignition coil ZS to a current intensity , which is below the charging current required to generate a spark in the ignition phase. While in the embodiment shown in FIG. 1 this circuit device consisted of a timer ZG and a switch S1 actuated by the timer ZG, in the embodiment shown in FIG. 5 this circuit device is formed by a ramp generator RG1, the output voltage of which is in the form of a Irp at the comparator K1.

Das in Fig. 5 dargestellte Ausführungsbeispiel der erfindungsgemäßen Schaltungsanordnung unterscheidet sich weiterhin von dem in Fig. 1 dargestellten Ausführungsbeispiel dadurch, daß der Wert Iist d.h. der Stromistwert des über die Primärwicklung der Zündspule ZS bei durchgeschaltetem Leistungstransistor Tr2 fließenden Stromes nicht nur am Eingang des Komparators K1 sondern auch an einer als Signalauswerteeinrichtung ausgebildeten Anzeigeeinrichtung A1 liegt.The embodiment shown in Fig. 5 Circuit arrangement according to the invention also differs from the exemplary embodiment shown in FIG. 1 in that the value Iactual, that is to say the actual current value of the current flowing via the primary winding of the ignition coil ZS when the power transistor Tr2 is switched through, not only at the input of the comparator K1 but also on a display device designed as a signal evaluation device A1 lies.

Das in Fig. 5 dargestellte Ausführungsbeispiel ist insbesondere dazu geeignet, über die Amplitude der Flammerkennungsimpulse eine Aussage über die Strömungsgeschwindigkeit der Flamme oder des Gasgemisches im Brennraum zu treffen. Dazu werden an die Funkenstrecke FS Impulse mit steigender Spannungsamplitude geschaltet. Das wird über den Rampengenerator RG1 erreicht, dessen Ausgangsspannung mit der Zeit linear ansteigt. Durch die dementsprechende kontinuierliche Erhöhung des Primärladestroms Iist, der über den Widerstand R2 fließt, der als Stromsensor arbeitet, werden auf der Sekundärseite der Zündspule ZS dann Impulse mit steigender Amplitude erzeugt. Da der Ionisationskanal, d.h. die tatsächliche Funkenstrecke FS bei höheren Geschwindigkeiten des Gasgemisches oder bei höheren Flammengeschwindigkeiten zunimmt, liefert die Höhe der Amplitude der Impulse an der Funkenstrecke FS, die notwendig ist, um einen Überschlag zu bewirken, eine Information über die Flammen- oder Gasgemischgeschwindigkeit.The embodiment shown in FIG. 5 is particularly suitable for making a statement about the flow velocity of the flame or the gas mixture in the combustion chamber via the amplitude of the flame detection pulses. For this purpose, pulses are switched to the spark gap FS with increasing voltage amplitude. This is achieved via the ramp generator RG1, whose output voltage increases linearly with time. As a result of the corresponding continuous increase in the primary charging current Iact, which flows through the resistor R2, which works as a current sensor, pulses with increasing amplitude are then generated on the secondary side of the ignition coil ZS. Since the ionization channel, i.e. the actual spark gap FS increases at higher speeds of the gas mixture or at higher flame speeds, the height of the amplitude of the pulses at the spark gap FS, which is necessary in order to cause a flashover, provides information about the flame or gas mixture speed.

Zu dem Zeitpunkt, an dem bei steigender Spannungsamplitude der Impulse an der Funkenstrecke FS ein Überschlag zum ersten Mal erfolgt, liefert die Auswerteschaltung aus dem Gleichrichter Glr1, dem Integrationsglied R3, C2 über den Komparator K2 das Signal Uout, das an der Anzeigeeinrichtung A1 liegt. Der Wert des Primärladestromes Iist, der zu diesem Zeitpunkt d. h. zu dem Zeitpunkt, an dem das Signal Uout am Komparator K2 auftritt, liegt gleichfalls an der Anzeigeeinrichtung A1. Die Anzeigeeinrichtung A1 ist als Signalverarbeitungseinrichtung so ausgebildet, daß die Eingangswerte gespeichert und als Maß für die Geschwindigkeit der Flamme oder des Gasgemisches ausgewertet und verwendet werden können.At the point in time when a flashover occurs for the first time when the voltage amplitude of the pulses on the spark gap FS increases, the evaluation circuit supplies the signal Uout from the rectifier Glr1, the integration element R3, C2 via the comparator K2, which signal is present at the display device A1. The value of the primary charging current Iact, which at this point in time, ie at the point in time at which the signal Uout occurs at the comparator K2, is likewise on the display device A1. The display device A1 is designed as a signal processing device so that the input values are stored and as a measure for the speed of the flame or the gas mixture can be evaluated and used.

Das in Fig. 5 dargestellte Ausführungsbeispiel der erfindungsgemäßen Schaltungsanordnung bietet gegenüber dem in Fig. 1 dargestellen Ausführungsbeispiel somit die weitere Möglichkeit, nicht nur eine Flammerkennung durchzuführen sondern auch eine Information über die Geschwindigkeit der Flamme oder des zu zündenden Gasgemisches zu erhalten.The embodiment of the circuit arrangement according to the invention shown in FIG. 5 thus offers the further possibility, compared to the embodiment shown in FIG. 1, not only to carry out a flame detection but also to obtain information about the speed of the flame or of the gas mixture to be ignited.

Als Betriebsarten einer derartigen Zündung mit Zünddiagnose und Flammerkennung kommen der intermittierende Betrieb von Zündphase und Flammerkennung, ein aufeinanderfolgender Betrieb sowie auch ein extern gesteuerter Betrieb in Frage.Intermittent operation of the ignition phase and flame detection, a successive operation and also an externally controlled operation can be considered as operating modes of such an ignition with ignition diagnosis and flame detection.

Tritt weiterhin in der Flammerkennungsphase eine hochspannungsseitige Unterbrechung auf, so wird auch das erkannt und zur Anzeige gebracht. D.h., daß die Funkenstrecke FS in der Flammerkennungsphase auch auf Unterbrechung der hochspannungsseitigen Anschlüße untersucht wird, was ebenso wie bei der Flammerkennung über die entweder belastete oder unbelastete Zündspule ZS möglich ist.If there is still an interruption on the high-voltage side in the flame detection phase, this is also detected and displayed. This means that the spark gap FS is also examined in the flame detection phase for an interruption in the high-voltage connections, which is also possible with the flame detection via the either loaded or unloaded ignition coil ZS.

Aufgrund des geringen Schaltungsaufwandes läßt sich die oben beschriebene Schaltungsanordnung kostengünstig herstellen, sie bietet dennoch die Möglichkeit einer sicheren Flammerkennung sowie einer zusätzlichen Zünddiagnose um Fehlerkennungen auszuschließen.Because of the low circuit complexity, the circuit arrangement described above can be produced inexpensively, but it nevertheless offers the possibility of reliable flame detection and an additional ignition diagnosis in order to rule out fault detections.

Claims (6)

Schaltungsanordnung zur Flammerkennung für eine Transistorspulenzündung eines Brenners, die eine Ansteuerstufe aufweist, die einen im Stromkreis der Primärwicklung einer Zündspule liegenden Leistungstransistor ansteuert, gekennzeichnet durch - eine Schaltungseinrichtung (ZG1, S1; RG1), die in einer Flammerkennungsphase den über die Primärwicklung der Zündspule (ZS) fließenden Ladestrom auf eine Stärke begrenzt, die unter der für die Erzeugung eines Zündfunkens in der Zündphase notwendigen Ladestromstärke liegt, und - eine Auswerteschaltung (Glr1, R3, C2, K2), die das nach Unterbrechung des über die Primärwicklung der Zündspule (ZS) fließenden Ladestromes auftretende Signal von der Primärwicklung der Zündspule (ZS) in ein Anzeigesignal für das Vorliegen oder Fehlen einer Flamme im Brenner verarbeitet. Circuit arrangement for flame detection for a transistor coil ignition of a burner, which has a control stage which controls a power transistor located in the circuit of the primary winding of an ignition coil, characterized by - A circuit device (ZG1, S1; RG1) which, in a flame detection phase, limits the charging current flowing through the primary winding of the ignition coil (ZS) to a strength which is below the charging current intensity required for generating an ignition spark in the ignition phase, and - An evaluation circuit (Glr1, R3, C2, K2), which, after an interruption of the charging current flowing through the primary winding of the ignition coil (ZS), from the primary winding of the ignition coil (ZS) into a display signal for the presence or absence of a flame in the burner processed. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Schaltungseinrichtung (ZG1, S1) aus einem Zeitglied (ZG1) und einem durch das Zeitglied (ZG1) betätigten Schalter (S1) besteht, der je nach Schalterstellung den Stromstärkewert für die Flammerkennung oder für die Zündung an einen Eingang eines Komparators (K1) in der Ansteuerstufe der Transistorspulenzündung legt, an dessen anderem Eingang der Stromstärkewert eines Stromsensors (R2) im Stromkreis der Primärwicklung der Zündspule (ZS) liegt.Circuit arrangement according to Claim 1, characterized in that the circuit device (ZG1, S1) consists of a timer (ZG1) and a switch (S1) actuated by the timer (ZG1) which, depending on the switch position, has the current value for flame detection or for ignition to an input of a comparator (K1) in the control stage of the transistor coil ignition, at the other input of which the current value of a current sensor (R2) lies in the circuit of the primary winding of the ignition coil (ZS). Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß die Schaltungseinrichtung (RG1), aus einem Rampengenerator besteht, der eine linear ansteigende Ausgangsspannung liefert, die am Eingang eines Komparators (K1) in der Ansteuerstufe der Transistorspulenzündung liegt, an dessen anderem Eingang der Stromstärkewert eines Stromsensors (R2) im Stromkreis der Primärwicklung der Zündspule (ZS) liegt, wobei dieser Stromstärkewert des Stromsensors (R2) zusammen mit dem Anzeigesignal der Auswerteschaltung (Glr1, R3, C2, K2) an einer Signalverarbeitungsschaltung (A1) liegt, die eine dem Anzeigesignal entsprechende Anzeige liefert und die Eingangssignale in ein Maß für die Geschwindigkeit der Flamme und/oder der Geschwindigkeit des Brenngasgemisches verarbeitet.Circuit arrangement according to Claim 1, characterized in that the circuit device (RG1) consists of a ramp generator which supplies a linearly increasing output voltage which is at the input of a comparator (K1) in the control stage of the transistor coil ignition, on the latter Another input is the current value of a current sensor (R2) in the circuit of the primary winding of the ignition coil (ZS), this current value of the current sensor (R2) together with the display signal of the evaluation circuit (Glr1, R3, C2, K2) being connected to a signal processing circuit (A1) , which provides a display corresponding to the display signal and processes the input signals into a measure of the speed of the flame and / or the speed of the fuel gas mixture. Schaltungsanordnung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Auswerteschaltung (Glr1, R3, C2, K2) einen weiteren Komparator (K2) aufweist, der das über einen Gleichrichter (Glr1) und ein Integrationsglied (R3, C2) integrierte Signal von der Primärwicklung der Zündspule (ZS) mit einem Bezugswert vergleicht und ein dem Vergleich entsprechendes Signal ausgibt.Circuit arrangement according to Claim 1, 2 or 3, characterized in that the evaluation circuit (Glr1, R3, C2, K2) has a further comparator (K2) which has the signal integrated via a rectifier (Glr1) and an integration element (R3, C2) compares the primary winding of the ignition coil (ZS) with a reference value and outputs a signal corresponding to the comparison. Schaltungsanordnung nach Anspruch 4, dadurch gekennzeichnet, daß das Ausgangssignal des weiteren Komparators (K2) an einer Anzeigeeinrichtung (A1) liegt.Circuit arrangement according to claim 4, characterized in that the output signal of the further comparator (K2) is on a display device (A1). Schaltungsanordnung nach Anspruch 4, gekennzeichnet durch eine Zünddiagnoseeinrichtung (ZüD1), deren Ausgangssignal an der Anzeigeeinrichtung (A1) liegt.Circuit arrangement according to Claim 4, characterized by an ignition diagnosis device (ZüD1), the output signal of which is at the display device (A1).
EP94109218A 1993-07-23 1994-06-15 Circuit for flame detection Expired - Lifetime EP0635638B1 (en)

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