EP0770824B1 - Method and circuit for controlling a gas burner - Google Patents

Method and circuit for controlling a gas burner Download PDF

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Publication number
EP0770824B1
EP0770824B1 EP96115721A EP96115721A EP0770824B1 EP 0770824 B1 EP0770824 B1 EP 0770824B1 EP 96115721 A EP96115721 A EP 96115721A EP 96115721 A EP96115721 A EP 96115721A EP 0770824 B1 EP0770824 B1 EP 0770824B1
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EP
European Patent Office
Prior art keywords
value
lambda
gas
electrical
burner
Prior art date
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EP96115721A
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German (de)
French (fr)
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EP0770824A3 (en
EP0770824A2 (en
Inventor
Hubert Nolte
Martin Herrs
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Stiebel Eltron GmbH and Co KG
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Stiebel Eltron GmbH and Co KG
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Priority claimed from DE19539568A external-priority patent/DE19539568C1/en
Priority claimed from DE19618573A external-priority patent/DE19618573C1/en
Application filed by Stiebel Eltron GmbH and Co KG filed Critical Stiebel Eltron GmbH and Co KG
Publication of EP0770824A2 publication Critical patent/EP0770824A2/en
Publication of EP0770824A3 publication Critical patent/EP0770824A3/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • 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
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/26—Measuring humidity
    • F23N2225/30—Measuring humidity measuring lambda
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/20—Calibrating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/30—Representation of working time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves

Definitions

  • the invention relates to a method for controlling a Gas burner, in particular gas fan burner, with a Measuring electrode, in particular ionization electrode, the one of the combustion temperature or the Lambda actual value derived electrical quantity to a Control circuit sets which this size with a compares the selected electrical setpoint and that Gas-air ratio (lambda) to a corresponding Set Lambda setpoint. Furthermore, the Invention a corresponding control circuit.
  • DE 44 33 425 A is one Control device for a gas fan burner described. Through an alternating voltage superimposition, the Evaluate ionization current safely. The respective Air excess (lambda value) of the respective The state of combustion is determined by the ionization electrode detected and in the control circuit with a set Setpoint compared. The composition of the gas-combustion air mixture will be accordingly adjusted so that the end result is always with a desired lambda setpoint is worked. Desired is an over-stoichiometric ratio of air to gas, the lambda setpoint is preferably between 1.15 and 1.3 lies. It is achieved in that at different gas qualities, for example natural gas and LPG, as well as changing Environmental conditions one in terms of emissions and of the firing efficiency Combustion takes place.
  • the thermal coupling between the Change the ionization electrode and the gas burner for example by bending, wear and tear Contamination of the ionization electrode or soot of the burner. It has been found that this leads to the fact that despite the lambda value remaining the same Ionization current and thus the derived Measured variable changes. So it changes Proportionality factor between the lambda value and the derived electrical quantity. This one changed measuring voltage at the comparator of the control circuit is present, to which the - unchanged - setpoint acts, the control circuit is the gas-air mixture, ie the lambda value, making it a Deviation of the actual lambda value from the desired lambda value comes what is undesirable.
  • the object of the invention is a method and Propose circuit of the type mentioned at the beginning, with the influence of a change in proportionality between the lambda value and the derived one electrical measurand on the scheme in such a way is balanced that the desired gas-air ratio (Lambda setpoint) is maintained.
  • the above object is in a method of type mentioned by the features of claim 1 and with regard to the circuit by the features of the Claim 6 solved.
  • the control switched off and on for a short time Run through the calibration cycle This is the gas-air mixture necessarily enriched, i.e. the lambda value reduced from> 1.
  • the invention is such Avoid adjustment, so that even then desired lambda setpoint is regulated when the between the combustion temperature and the electrical Measurand has changed the existing proportionality factor.
  • a gas burner (1) has a speed-adjustable fan (2) that promotes combustion air. He is with one Gas supply (3) in which a gas solenoid valve (3 ') is arranged, provided. In the flame area of the Gas burner (1) is an ionization electrode (4) Measuring electrode arranged. This measuring electrode (4) is at Gas burners common. Usually, however, it only serves the Flame monitoring. The measuring electrode (4) detects the at the respective combustion state Ionization current. This depends on Richardson's Equation from the electrode temperature and thus from the respective lambda value of the respective gas-air mixture from.
  • a capacitive Coupling element (5) On the measuring electrode (4) is a capacitive Coupling element (5) an AC voltage, in the example simply the mains AC voltage, switched on.
  • the Coupling element (5) is connected to earth via a resistor (6) placed so that the ionization path (flame area) is electrically connected in parallel to the resistor (6).
  • a voltage-impedance converter (7) is connected to the measuring electrode (4) a low pass (8) on the output side a control circuit (9) is connected.
  • the control circuit (9) of FIG. 1 has a comparator (10) to which a setpoint generator (11) is placed.
  • a desired lambda value for example 1.15 to 1.3, corresponding electrical Setpoint adjustable.
  • An automatic start (15) is in the control circuit (9) integrated, which controls the switch (13).
  • a setpoint generator (16) for one Starting speed.
  • the ionization electrode (4) detected ionization current leads to the fact that a direct voltage is superimposed on the alternating voltage. This is proportional to the ionization in the flame area. It is proportional to the respective one Excess air (lambda). In practice, it is between 0 V and 200 V. The voltage is used for further processing reduced and at the exit of the low pass (8) occurs in For example, a DC voltage between 0 V and 10 V on.
  • the excess air of the respective gas-air mixture embodied voltage (ionization voltage Ui) is in the Comparator (10) compared with a target value.
  • the Difference between the two values is in a stream changed the state of charge of the Storage capacitor (17), which is the instantaneous speed value corresponds as long as changes and thus the Controls the speed of the fan (2) accordingly until the respective excess air (actual lambda value) the target lambda value is equal to.
  • the speed is used to set the excess air of the blower (2) or the gas supply (3) regulated.
  • the control circuit (9) can also be used as a digital circuit be built with a microprocessor.
  • An activation circuit (21) is also provided. This counts those triggered by the automatic start (15) Start processes or records the operating hours of the Gas burner (1). With the activation circuit (21) is a Ramp generator (22) connected to a third Switch position of the switch (13) is connected.
  • Detection circuit (23) which is also connected to the Activation circuit (21) is connected and one Storage circuit (24) is connected downstream.
  • the Memory circuit (24) is connected to the setpoint device (11) connected.
  • the functionality of the additional circuit in one Calibration cycle is about the following:
  • the ramp generator (22) now controls the blower (2) or the gas solenoid valve (3 ') in such a way that the Gas-air mixture is "enriched", ie the Gas content increased.
  • the lambda value is one Value> 1, for example 1.3, continuously to one Value reduced below 1.
  • This results in one of the Ionization electrode (4) derived course of Measuring voltage (ionization voltage Ui) at the output of the Low pass (8), as in one of the curves I, II, III in Fig. 2 is shown as an example.
  • Which of the curves depends on the condition of the ionization electrode (4) or the gas burner (1); so it depends like the ionization electrode (4) in the connection area of the Burner flames. For example, bent, worn or sooty ionization electrode (4) a different voltage curve than in "good condition.
  • the detection circuit (23) detects the respective Voltage maximum A, B, C, for example by the Evaluates slope of curve I, II or III.
  • the respective Maximum voltage is in the memory circuit (24) filed.
  • the memory circuit (24) represents the basic value (100%) of the setpoint device (11) to this value.
  • the characteristic curve results in a calibration cycle (II) with the maximum value (B), which is the consequence of a Change in state of the ionization electrode (4), then is this voltage value (B) in the memory circuit (24) saved as the basic value for the setpoint generator (11).
  • the Setpoint generator (11) remains at 90% of a basic value set, which shows b in Fig.2. From Fig.2 is it can be seen that the voltage (b) (90% of the Maximum voltage B) across the comparator (10) if control after the calibration cycle using the Switch (13) is switched on again, a regulation to the Lambda setpoint of 1.2.
  • the calibration cycles are compared to the times in which the gas burner (1) in normal control operation works, very short, so that during the Calibration cycles with one of the Lambda setpoint deviating lambda value combustion occurring in purchase can be taken. In each case to one Calibration process subsequent regular operation the combustion improves.
  • the calibration is the one described Control function switched off.
  • the calibration is done preferably at a constant speed of the Blower (2) to the influence of the blower (2) on the To suppress combustion. It is cheap Perform calibration at medium speed, to avoid modulation limits during calibration of the control signal (J) which is sent to the gas solenoid valve (3 ') is laid to bump.
  • the calibration can also be done during switching the blower (2) from one Performance level to the other performance level because the speed change compared to the calibration process is slow so that the speed during the Calibration process is quasi constant.
  • the calibration process is carried out at time (t1) (see Fig. 3) from the event or operating hours counter during the transition from the full load level to the partial load level of the blower (2) started when the decreasing modulation current (J) reached a low value (Jk). It is then from the Control circuit (9) of the modulation current (J) and thus over the gas solenoid valve (3 ') increases the gas supply, causing the Ionization voltage (Ui) increases accordingly. To the At time (t2) the ionization voltage (Ui) reaches one predetermined value, for example 0.9 Uimax.
  • the Time period (t1 to t2) serves to start the preheating the ionization electrode (4). From the time (t2) until the time (t3) the modulation current (J) remains constant held. During this period (t2 to t3) it heats up the ionization electrode (4) to a stable temperature and thereby guarantees reproducible measured values.
  • the modulation current (J) is increased further until the Ionization voltage (Ui) again about 10% below that Uimax value is what in Figure 3 at time (t4) Case is.
  • the lambda value is in the period (t3 to t4) the incineration itself is unfavorable, but this does not ins Weight drops because this time span is at most a few Takes seconds.
  • the control circuit (9) switches back to the control process described above. This starts when the (t5) Ionization voltage (Ui), the modulation current (J) and the Have stabilized gas pressure (p).
  • the control circuit (9) conducts the measured values obtained. a correspondingly adjusted new setpoint for the Ionization voltage.
  • Control circuit (9) will also change in the period (t3 to t4) result in a series of measured values. Compared to the other measured values of the series strongly differing measured values are suppressed because they rely on external electrical Interference may be based.
  • the first transfer criterion covers a sudden one Change all components of the control loop. It is fulfilled if the deviation of the new calibration value is sufficiently small from the previous calibration values.
  • the second handover criterion records a "creeping Drift "of the system (burner control), which in the event of deviation sufficient from the values provided by the manufacturer is small.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)

Abstract

The regulation system uses an ionisation electrode (4) providing an ionisation signal dependent in the temp. or lambda value of the combustion, supplied to a regulation circuit (9) for comparison with a reference value, for adjustment of the air/fuel ratio for the burner (1). A calibration cycle is initiated at regular intervals or after a defined operating time, with the lambda value reduced and the corresponding ionisation signal measured. The max. values of the ionisation signal are stored for correction of the required value for the regulation.

Description

Die Erfindung betrifft ein Verfahren zur Regelung eines Gasbrenners, insbesondere Gasgebläsebrenners, mit einer Meßelektrode, insbesondere Ionisations-Elektrode, die eine von der Verbrennungstemperatur bzw. dem Lambda-Istwert abgeleitete elektrische Größe an eine Regelschaltung legt, welche diese Größe mit einem gewählten elektrischen Sollwert vergleicht und das Gas-Luft-Verhältnis (Lambda) auf einen entsprechenden Lambda-Sollwert einstellt. Weiterhin betrifft die Erfindung eine entsprechende Regelschaltung.The invention relates to a method for controlling a Gas burner, in particular gas fan burner, with a Measuring electrode, in particular ionization electrode, the one of the combustion temperature or the Lambda actual value derived electrical quantity to a Control circuit sets which this size with a compares the selected electrical setpoint and that Gas-air ratio (lambda) to a corresponding Set Lambda setpoint. Furthermore, the Invention a corresponding control circuit.

In der DE 39 37 290 A1 ist eine derartige Regelung beschrieben. Dort liegt die Ionisations-Elektrode in einem Gleichstromkreis. Die Auswertung des Ionisationsstromes ist in der Praxis problematisch, wenn ein proportionaler Zusammenhang zwischen dem Ionisationsstrom und dem Lambda-Wert ermittelt werden soll.Such a regulation is in DE 39 37 290 A1 described. The ionization electrode is located there a DC circuit. The evaluation of the Ionization current is problematic in practice, though a proportional relationship between the Ionization current and the lambda value can be determined should.

In der DE 44 33 425 A ist eine Regeleinrichtung für einen Gasgebläsebrenner beschrieben. Durch eine Wechselspannungsüberlagerung läßt sich der Ionisationsstrom sicher auswerten. Der jeweilige Luftüberschuß (Lambda-Wert) des jeweiligen Verbrennungszustandes wird über die Ionisations-Elektrode erfaßt und in der Regelschaltung mit einem eingestellten Sollwert verglichen. Die Zusammensetzung des Gas-Verbrennungsluft-Gemisches wird entsprechend nachgeregelt, so daß im Endergebnis immer mit einem gewünschten Lambda-Sollwert gearbeitet wird. Gewünscht ist ein überstöchiometrisches Verhältnis von Luft zu Gas, wobei der Lambda-Sollwert vorzugsweise zwischen 1,15 und 1,3 liegt. Es wird dadurch erreicht, daß bei unterschiedlichen Gasqualitäten, beispielsweise Erdgas und Flüssiggas, sowie bei wechselnden Umgebungsbedingungen eine hinsichtlich der Emissionen und des feuerungstechnischen Wirkungsgrades optimale Verbrennung erfolgt.DE 44 33 425 A is one Control device for a gas fan burner described. Through an alternating voltage superimposition, the Evaluate ionization current safely. The respective Air excess (lambda value) of the respective The state of combustion is determined by the ionization electrode detected and in the control circuit with a set Setpoint compared. The composition of the gas-combustion air mixture will be accordingly adjusted so that the end result is always with a desired lambda setpoint is worked. Desired is an over-stoichiometric ratio of air to gas, the lambda setpoint is preferably between 1.15 and 1.3 lies. It is achieved in that at different gas qualities, for example natural gas and LPG, as well as changing Environmental conditions one in terms of emissions and of the firing efficiency Combustion takes place.

Im Betrieb kann sich die thermische Kopplung zwischen der Ionisations-Elektrode und dem Gasbrenner ändern, beispielsweise durch Verbiegen, Verschleiß und Verschmutzung der Ionisations-Elektrode oder Verrußung des Brenners. Es wurde gefunden, daß dies dazu führt, daß sich trotz an sich gleichbleibenden Lambda-Wert der Ionisationsstrom und damit die daraus abgeleitete Meßgröße ändert. Es ändert sich also der Proportionalitätsfaktor zwischen dem Lambda-Wert und der daraus abgeleiteten elektrischen Größe. Da diese geänderte Meßspannung am Vergleicher der Regelschaltung anliegt, auf den auch der - unveränderte - Sollwert wirkt, wird die Regelschaltung das Gas-Luft-Gemisch, also den Lambda-Wert, verstellen, wodurch es zu einer Abweichung des Lambda-Istwertes vom Lambda-Sollwert kommt, was unerwünscht ist.During operation, the thermal coupling between the Change the ionization electrode and the gas burner, for example by bending, wear and tear Contamination of the ionization electrode or soot of the burner. It has been found that this leads to the fact that despite the lambda value remaining the same Ionization current and thus the derived Measured variable changes. So it changes Proportionality factor between the lambda value and the derived electrical quantity. This one changed measuring voltage at the comparator of the control circuit is present, to which the - unchanged - setpoint acts, the control circuit is the gas-air mixture, ie the lambda value, making it a Deviation of the actual lambda value from the desired lambda value comes what is undesirable.

Aufgabe der Erfindung ist es, ein Verfahren und eine Schaltung der eingangs genannten Art vorzuschlagen, mit dem/der der Einfluß einer Änderung der Proportionalität zwischen dem Lambda-Wert und der daraus abgeleiteten elektrischen Meßgröße auf die Regelung in der Weise ausgeglichen wird, daß das gewünschte Gas-Luft-Verhältnis (Lambda-Sollwert) aufrechterhalten bleibt.The object of the invention is a method and Propose circuit of the type mentioned at the beginning, with the influence of a change in proportionality between the lambda value and the derived one electrical measurand on the scheme in such a way is balanced that the desired gas-air ratio (Lambda setpoint) is maintained.

Erfindungsgemäß ist obige Aufgabe bei einem Verfahren der eingangs genannten Art durch die Merkmale des Anspruchs 1 und hinsichtlich der Schaltung durch die Merkmale des Anspruchs 6 gelöst.According to the invention, the above object is in a method of type mentioned by the features of claim 1 and with regard to the circuit by the features of the Claim 6 solved.

Nach einer gewissen Betriebszeit, die entweder durch einen Betriebsstundenzähler oder durch Zählen der Einschaltvorgänge des Brenners erfaßt werden kann, wird die Regelung für kurze Zeit abgeschaltet und ein Kalibrierungszyklus durchfahren. In diesem wird das Gas-Luft-Gemisch zwangsweise angefettet, also der Lambda-Wert von > 1 ausgehend reduziert. Die erfaßte elektrische Meßgröße durchläuft bei Lambda = 1 ein Maximum. Dieser Wert wird festgehalten. Weicht er vom eingestellten elektrischen Grund-Sollwert ab, dann wird dieser nachjustiert. Eine solche Abweichung stellt sich ein, wenn sich die Ionisations-Elektrode verbogen hat, abgenutzt ist oder verrußt ist, was an sich zu einer unerwünschten Verstellung des Gas-Luft-Verhältnisses führen würde. Durch die Erfindung ist eine solche Verstellung vermieden, so daß auch dann auf den gewünschten Lambda-Sollwert geregelt wird, wenn sich der zwischen der Verbrennungstemperatur und der elektrischen Meßgröße bestehende Proportionalitätsfaktor geändert hat.After a certain period of operation, either by an hour meter or by counting the Switch-on operations of the burner can be detected the control switched off and on for a short time Run through the calibration cycle. This is the gas-air mixture necessarily enriched, i.e. the lambda value reduced from> 1. The detected electrical Measured variable runs through a maximum at Lambda = 1. This Value is held. Does it differ from the set electrical base setpoint, then it will readjusted. Such a deviation arises if the ionization electrode is bent, is worn or sooty, which in itself becomes a undesirable adjustment of the gas-air ratio would lead. The invention is such Avoid adjustment, so that even then desired lambda setpoint is regulated when the between the combustion temperature and the electrical Measurand has changed the existing proportionality factor.

Nach dem Kalibrierungszyklus wird, gegebenenfalls nach Auswertung eines oder mehrerer Übergabekriterien, wieder auf "Regelung" umgeschaltet. Wenn die Abweichung außerhalb eines "Fensters" liegt, wird ein Störsignal ausgelöst und/oder der Brenner zwangsweise abgeschaltet.After the calibration cycle, if necessary after Evaluation of one or more handover criteria, again switched to "regulation". If the deviation is outside a "window", an interference signal triggered and / or the burner forcibly switched off.

Weitere Ausgestaltungen ergeben sich aus den abhängigen Ansprüchen und der folgenden Beschreibung eines Ausführungsbeispiels. In der Zeichnung zeigen:

  • Figur 1 ein Blockschaltbild einer Regelschaltung bei einem Gasgebläsebrenner,
  • Figur 2 ein Kennliniendiagramm und
  • Figur 3 ein Zeitdiagramm beim Start eines Kalibrierungsvorgangs.
    • Further refinements result from the dependent claims and the following description of an exemplary embodiment. The drawing shows:
  • FIG. 1 shows a block diagram of a control circuit in a gas fan burner,
  • Figure 2 is a characteristic diagram and
  • Figure 3 is a timing diagram at the start of a calibration process.

    • Ein Gasbrenner(1) weist ein drehzahlregelbares Gebläse(2) auf, das Verbrennungsluft fördert. Er ist mit einer Gaszuführung(3), in der ein Gasmagnetventil(3') angeordnet ist, versehen. Im Flammenbereich des Gasbrenners(1) ist eine Ionisations-Elektrode(4) als Meßelektrode angeordnet. Diese Meßelektrode(4) ist bei Gasbrennern üblich. Gewöhnlich dient sie jedoch nur der Flammenüberwachung. Die Meßelektrode(4) erfaßt den sich beim jeweiligen Verbrennungszustand einstellenden Ionisationsstrom. Dieser hängt nach der Richardson'schen Gleichung von der Elektrodentemperatur und damit auh vom jeweiligen Lambda-Wert des jeweiligen Gas-Luft-Gemisches ab.A gas burner (1) has a speed-adjustable fan (2) that promotes combustion air. He is with one Gas supply (3) in which a gas solenoid valve (3 ') is arranged, provided. In the flame area of the Gas burner (1) is an ionization electrode (4) Measuring electrode arranged. This measuring electrode (4) is at Gas burners common. Usually, however, it only serves the Flame monitoring. The measuring electrode (4) detects the at the respective combustion state Ionization current. This depends on Richardson's Equation from the electrode temperature and thus from the respective lambda value of the respective gas-air mixture from.

    Auf die Meßelektrode(4) ist über ein kapazitives Koppelglied(5) eine Wechselspannung, im Beispielsfalle einfach die Netzwechselspannung, aufgeschaltet. Das Koppelglied(5) ist über einen Widerstand(6) an Erde gelegt, so daß die Ionisationsstrecke (Flammenbereich) elektrisch parallel zum Widerstand(6) geschaltet ist.On the measuring electrode (4) is a capacitive Coupling element (5) an AC voltage, in the example simply the mains AC voltage, switched on. The Coupling element (5) is connected to earth via a resistor (6) placed so that the ionization path (flame area) is electrically connected in parallel to the resistor (6).

    An der Meßelektrode(4) liegt über einen Spannungs-Impedanzwandler(7) ein Tiefpaß(8), der ausgangsseitig an eine Regelschaltung(9) angeschlossen ist.A voltage-impedance converter (7) is connected to the measuring electrode (4) a low pass (8) on the output side a control circuit (9) is connected.

    Die Regelschaltung(9) nach Fig. 1 weist einen Vergleicher (10) auf, an den ein Sollwertgeber(11) gelegt ist. Am Sollwertgeber(11) ist eine dem gewünschten Lambda-Wert, beispielsweise 1,15 bis 1,3, entsprechender elektrischer Sollwert einstellbar. An den Vergleicher(10) ist die Ausgangs-Gleichspannung des Tiefpasses(8) gelegt, die dem jeweiligen Lambda-Wert proportional ist. Ausgangsseitig liegt am Vergleicher(10) ein Spannungs/Stromwandler(12), welcher über einen Umschalter(13) an einen Leistungstreiber(14) angeschlossen ist, der die Drehzahl des Gebläses(2) und/oder die Stellung des Gasmagnetventils(3') steuert.The control circuit (9) of FIG. 1 has a comparator (10) to which a setpoint generator (11) is placed. At the Setpoint generator (11) is a desired lambda value, for example 1.15 to 1.3, corresponding electrical Setpoint adjustable. To the comparator (10) Output DC voltage of the low-pass filter (8), which the respective lambda value is proportional. Output side there is a voltage / current converter (12) at the comparator (10), which via a switch (13) to one Power driver (14) is connected to the speed of the fan (2) and / or the position of the Gas solenoid valve (3 ') controls.

    In die Regelschaltung(9) ist eine Startautomatik(15) integriert, welche den Umschalter(13) steuert. Am Umschalter(13) liegt ein Sollwertgeber(16) für eine Startdrehzahl. Außerdem ist ein Speicher(17) für den momentanen Drehzahlwert und/oder den momentanen Einstellwert des Gasmagnetventils(3') vorgesehen.An automatic start (15) is in the control circuit (9) integrated, which controls the switch (13). At the Switch (13) is a setpoint generator (16) for one Starting speed. There is also a memory (17) for the current speed value and / or the current Setting value of the gas solenoid valve (3 ') provided.

    An den Ausgang des Tiefpasses(8) ist weiterhin ein Schmitt-Trigger(18) geschaltet, der der Flammenüberwachung dient.At the output of the low pass (8) is still a Schmitt trigger (18) switched which the Flame monitoring is used.

    Die Funktionsweise der soweit beschriebenen Regelschaltung ist etwa folgende:The functioning of the so far described Control circuit is about the following:

    Beim Start des Gasbrenners(1) schaltet die Startautomatik (15) auf den Sollwertgeber(16). Über den Leistungstreiber (14) läuft das Gebläse(2) dadurch mit einer Startdrehzahl, die ein sicher zündfähiges Gemisch ergibt.When the gas burner (1) starts, the automatic start switches (15) on the setpoint device (16). About the performance driver (14) the fan (2) runs with one Starting speed, which results in a mixture that can be ignited safely.

    Nach dem Zünden und erfolgreicher Flammenbildung schaltet die Startautomatik(15) den Umschalter(13) auf den Spannungs/Stromwandler(12). Der von der Ionisations-Elektrode(4) erfaßte Ionisationsstrom führt dazu, daß sich der Wechselspannung eine Gleichspannung überlagert. Diese ist proportional der Ionisation im Flammenbereich. Sie ist proportional dem jeweiligen Luftüberschuß(lambda). In der Praxis liegt sie zwischen 0 V und 200 V. Zur Weiterverarbeitung wird die Spannung herabgesetzt und am Ausgang des Tiefpasses(8) tritt im Beispielsfalle eine Gleichspannung zwischen 0 V und 10 V auf.After ignition and successful flame formation, switches the automatic start (15) the switch (13) on the Voltage / current converter (12). The ionization electrode (4) detected ionization current leads to the fact that a direct voltage is superimposed on the alternating voltage. This is proportional to the ionization in the flame area. It is proportional to the respective one Excess air (lambda). In practice, it is between 0 V and 200 V. The voltage is used for further processing reduced and at the exit of the low pass (8) occurs in For example, a DC voltage between 0 V and 10 V on.

    Die den Luftüberschuß des jeweiligen Gas-Luft-Gemisches verkörpernde Spannung (Ionisationsspannung Ui) wird im Vergleicher(10) mit einem Sollwert verglichen. Die Differenz zwischen den beiden Werten wird in einen Strom gewandelt, der den Ladezustand des Speicherkondensators(17), welcher dem Drehzahl-Momentanwert entspricht, solange ändert und damit die Drehzahl des Gebläses(2) entsprechend steuert, bis der jeweilige Luftüberschuß (Lambda-Istwert) dem Lambda-Sollwert gleich ist.The excess air of the respective gas-air mixture embodied voltage (ionization voltage Ui) is in the Comparator (10) compared with a target value. The Difference between the two values is in a stream changed the state of charge of the Storage capacitor (17), which is the instantaneous speed value corresponds as long as changes and thus the Controls the speed of the fan (2) accordingly until the respective excess air (actual lambda value) the target lambda value is equal to.

    Erfolgt danach eine Veränderung der Verbrennungsbedingungen, beispielsweise Änderung der Gasart, Änderung des Gasdrucks, Änderung der Umgebungstemperaturen o.ä., und weicht dadurch der Lambda-Istwert vom Lambda-Sollwert ab, dann werden diese Störungen in der beschriebenen Weise ausgeregelt.If there is a change after that Combustion conditions, for example changing the Gas type, change in gas pressure, change in Ambient temperatures or the like, and thereby gives way to the Lambda actual value from the Lambda setpoint, then these Faults corrected in the manner described.

    Wenn die Flamme erlischt, wird über den Schmitt-Trigger (18) die Gaszufuhr(3) mittels des Gasmagnetventils(3') gesperrt.When the flame goes out, the Schmitt trigger (18) the gas supply (3) by means of the gas solenoid valve (3 ') blocked.

    Zur Einstellung des Luftüberschusses wird die Drehzahl des Gebläses(2) oder die Gaszufuhr(3) geregelt.The speed is used to set the excess air of the blower (2) or the gas supply (3) regulated.

    Die Regelschaltung(9) kann auch als digitale Schaltung mit einem Mikroprozessor aufgebaut sein.The control circuit (9) can also be used as a digital circuit be built with a microprocessor.

    Weiterhin ist eine Aktivierungsschaltung(21) vorgesehen. Diese zählt die von der Startautomatik(15) ausgelösten Startvorgänge oder erfaßt die Betriebsstunden des Gasbrenners(1). Mit der Aktivierungsschaltung(21) ist ein Rampengenerator(22) verbunden, der an eine dritte Schaltposition des Umschalters(13) angeschlossen ist.An activation circuit (21) is also provided. This counts those triggered by the automatic start (15) Start processes or records the operating hours of the Gas burner (1). With the activation circuit (21) is a Ramp generator (22) connected to a third Switch position of the switch (13) is connected.

    Am Ausgang des Tiefpasses(8) liegt eine Erkennungsschaltung(23), die ebenfalls an die Aktivierungsschaltung(21) angeschlossen ist und der eine Speicherschaltung(24) nachgeschaltet ist. Die Speicherschaltung(24) ist mit dem Sollwertgeber(11) verbunden.At the exit of the low pass (8) there is one Detection circuit (23), which is also connected to the Activation circuit (21) is connected and one Storage circuit (24) is connected downstream. The Memory circuit (24) is connected to the setpoint device (11) connected.

    Die Funktionsweise der zusätzlichen Schaltung in einem Kalibrierungszyklus ist etwa folgende:The functionality of the additional circuit in one Calibration cycle is about the following:

    Nach einer bestimmten Anzahl von Startvorgängen oder Betriebsstunden, beispielsweise 100 Startvorgängen oder 10 Betriebsstunden, bringt die Aktivierungsschaltung(21) den Umschalter(13) in seine dritte Schaltposition und aktiviert den Rampengenerator(22). Die oben beschriebene Regelung ist dadurch abgeschaltet.After a certain number of starts or Operating hours, for example 100 starts or 10 operating hours, brings the activation circuit (21) the switch (13) in its third switching position and activates the ramp generator (22). The one described above The control is switched off.

    Der Rampengenerator (22) steuert nun das Gebläse(2) oder das Gasmagnetventil(3') in der Weise, daß das Gas-Luft-Gemisch "angefettet" wird, sich also der Gasanteil erhöht. Der Lambda-Wert wird dabei von einem Wert > 1, beispielsweise 1,3, kontinuierlich auf einen Wert unter 1 reduziert. Dabei ergibt sich ein von der Ionisations-Elektrode(4) abgeleiteter Verlauf der Meßspannung (Ionisationsspannung Ui) am Ausgang des Tiefpasses(8), wie er in einer der Kurven I,II,III in Fig. 2 beispielshaft dargestellt ist. Welche der Kurven sich einstellt, hängt vom Zustand der Ionisations-Elektrode(4) bzw. des Gasbrenners(1) ab; also davon ab, wie die Ionisations-Elektrode(4) im Anschlußbereich der Brennerflammen liegt. Beispielsweise stellt sich bei verbogener, verschlissener oder verrußter Ionisations-Elektrode(4) ein anderer Spannungsverlauf ein als im "guten" Zustand.The ramp generator (22) now controls the blower (2) or the gas solenoid valve (3 ') in such a way that the Gas-air mixture is "enriched", ie the Gas content increased. The lambda value is one Value> 1, for example 1.3, continuously to one Value reduced below 1. This results in one of the Ionization electrode (4) derived course of Measuring voltage (ionization voltage Ui) at the output of the Low pass (8), as in one of the curves I, II, III in Fig. 2 is shown as an example. Which of the curves depends on the condition of the ionization electrode (4) or the gas burner (1); so it depends like the ionization electrode (4) in the connection area of the Burner flames. For example, bent, worn or sooty ionization electrode (4) a different voltage curve than in "good condition.

    Alle Kurven I,II,III durchlaufen bei Lambda = 1 ein Maximum. Die Maxima der Kurven I,II,III sind in Fig. 2 mit A,B,C bezeichnet.All curves I, II, III run through at lambda = 1 Maximum. The maxima of curves I, II, III are in FIG. 2 designated A, B, C.

    Die Erkennungsschaltung(23) erfaßt das jeweilige Spannungsmaximum A,B,C, beispielsweise indem sie die Steigung der Kurve I,II bzw. III auswertet. Die jeweilige Maximalspannung wird in der Speicherschaltung(24) abgelegt. Die Speicherschaltung(24) stellt den Grundwert (100%) des Sollwertgebers(11) auf diesen Wert ein.The detection circuit (23) detects the respective Voltage maximum A, B, C, for example by the Evaluates slope of curve I, II or III. The respective Maximum voltage is in the memory circuit (24) filed. The memory circuit (24) represents the basic value (100%) of the setpoint device (11) to this value.

    Geht man beispielsweise davon aus, daß I die Kennlinie eines "guten" Zustandes der Ionisations-Elektrode(4) ist und geht man davon aus, daß der Lambda-Sollwert 1,2 sein soll, dann ist der Sollwertgeber(11) so eingestellt worden, daß er auf 90% seines Grundwertes (100%) gestellt wurde (vgl. a in Fig.2, wobei Fig.2 nicht maßstabsgerecht ist).Assuming, for example, that I is the characteristic a "good" condition of the ionization electrode (4) and assuming that the Lambda setpoint is 1.2 the setpoint generator (11) is set in this way been placed on 90% of its base value (100%) (see a in Fig. 2, where Fig. 2 is not to scale is).

    Solange sich am Zustand der Ionisations-Elektrode(4) bzw. des Gasbrenners(1) nichts ändert, wird auch in den Kalibrierungszyklen an dem Grundwert (100%) des Sollwertgebers(11) nichts geändert.As long as the state of the ionization electrode (4) or the gas burner (1) does not change, is also in the Calibration cycles on the basic value (100%) of the Setpoint generator (11) nothing changed.

    Ergibt sich in einem Kalibrierungszyklus die Kennlinie (II) mit dem Maximalwert(B), was die Folge einer Zustandsänderung der Ionisations-Elektrode(4) ist, dann wird in der Speicherschaltung(24) dieser Spannungswert(B) als Grundwert für den Sollwertgeber(11) gespeichert. Der Sollwertgeber(11) bleibt weiter auf 90% eines Grundwertes eingestellt, was b in Fig.2 zeigt. Aus Fig.2 ist ersichtlich, daß bei der Spannung(b) (90% der Maximalspannung B) über den Vergleicher(10) dann, wenn die Regelung nach dem Kalibrierungszyklus mittels des Umschalters(13) wieder eingeschaltet wird, eine Regelung auf den Lambda-Sollwert von 1,2 erfolgt.The characteristic curve results in a calibration cycle (II) with the maximum value (B), which is the consequence of a Change in state of the ionization electrode (4), then is this voltage value (B) in the memory circuit (24) saved as the basic value for the setpoint generator (11). The Setpoint generator (11) remains at 90% of a basic value set, which shows b in Fig.2. From Fig.2 is it can be seen that the voltage (b) (90% of the Maximum voltage B) across the comparator (10) if control after the calibration cycle using the Switch (13) is switched on again, a regulation to the Lambda setpoint of 1.2.

    Es ist also erreicht, daß abhängig vom jeweiligen Zustand der Ionisations-Elektrode(4) die Regelschaltung(9) immer so nachgeregelt wird, daß die Regelschaltung(9) im Regelbetrieb den Lambda-Istwert auf den gewünschten Lambda-Sollwert regelt. Betriebsbedingte Zustandsänderungen der Ionisations-Elektrode(4) bzw. des Gasbrenners(1) sind also ausgeglichen.It is achieved that depending on the respective state the ionization electrode (4) the control circuit (9) always is adjusted so that the control circuit (9) in Control operation the actual lambda value to the desired Lambda setpoint controls. Operational Changes in state of the ionization electrode (4) or Gas burner (1) are therefore balanced.

    Für die beschriebene Nachstellung des Sollwertgebers(11) bestehen Grenzen. Diese sind in Fig. 2 durch das Fenster(F) angedeutet. Solange in den Kalibrierungszyklen die Maxima der Spannungsverläufe, wie A,B, innerhalb des Fensters(F) liegen, erfolgt die beschriebene Nachstellung des Sollwertgebers(11). Ergibt sich ein Spannungsmaximum, wie C, das außerhalb des Fensters(F) liegt, dann erkennt dies die Erkennungsschaltung(23) und löst ein Störsignal und/oder eine zwangsweise Abschaltung des Gasbrenners(1) aus.For the described adjustment of the setpoint device (11) there are limits. These are shown in Fig. 2 by the Window (F) indicated. As long as in the calibration cycles the maxima of the voltage profiles, such as A, B, within the Window (F) lie, the described adjustment takes place of the setpoint device (11). If there is a voltage maximum, like C, which is outside the window (F), then recognizes this is the detection circuit (23) and triggers an interference signal and / or a forced shutdown of the gas burner (1) out.

    Die Kalibrierungszyklen sind im Vergleich zu den Zeiten, in denen der Gasbrenner(1) im normalen Regelbetrieb arbeitet, sehr kurz, so daß die während den Kalibrierungszyklen mit einem vom Lambda-Sollwert abweichenden Lambda-Wert erfolgende Verbrennung in Kauf genommen werden kann. Im jeweils an einen Kalibrierungsvorgang anschließenden Regelbetrieb verbessert sich die Verbrennung.The calibration cycles are compared to the times in which the gas burner (1) in normal control operation works, very short, so that during the Calibration cycles with one of the Lambda setpoint deviating lambda value combustion occurring in purchase can be taken. In each case to one Calibration process subsequent regular operation the combustion improves.

    Weiterbildungen der oben beschriebenen Kalibrierungsvorgänge sind im folgenden erläutert.Developments of those described above Calibration procedures are explained below.

    Während der Kalibrierung ist die beschriebene Regelfunktion abgeschaltet. Die Kalibrierung erfolgt vorzugsweise bei sich nicht ändernder Drehzahl des Gebläses(2), um den Einfluß des Gebläses(2) auf die Verbrennung zu unterdrücken. Günstig ist es, die Kalibrierung bei einer mittleren Drehzahl durchzuführen, um während der Kalibrierung nicht an Modulationsgrenzen des Steuersignals(J), das an das Gasmagnetventil(3') gelegt ist, zu stoßen. Die Kalibrierung kann auch während des Umschaltens des Gebläses(2) von der einen Leistungsstufe auf die andere Leistungsstufe erfolgen, da die Drehzahländerung im Vergleich zum Kalibriervorgang langsam ist, so daß die Drehzahl während des Kalibriervorgangs quasi konstant ist.During the calibration is the one described Control function switched off. The calibration is done preferably at a constant speed of the Blower (2) to the influence of the blower (2) on the To suppress combustion. It is cheap Perform calibration at medium speed, to avoid modulation limits during calibration of the control signal (J) which is sent to the gas solenoid valve (3 ') is laid to bump. The calibration can also be done during switching the blower (2) from one Performance level to the other performance level because the speed change compared to the calibration process is slow so that the speed during the Calibration process is quasi constant.

    Der Kalibriervorgang wird zum Zeitpunkt(t1) (vgl. Fig.3) vom Ereignis- oder Betriebsstundenzähler beim Übergang von der Vollaststufe auf die Teillaststufe des Gebläses (2) gestartet, wenn der abnehmende Modulationsstrom(J) einen niedrigen Wert(Jk) erreicht. Es wird dann von der Regelschaltung(9) der Modulationsstrom(J) und damit über das Gasmagnetventil(3') die Gaszufuhr erhöht, wodurch die Ionisationsspannung(Ui) entsprechend ansteigt. Zum Zeitpunkt(t2) erreicht die Ionisationsspannung(Ui) einen vorbestimmten Wert, beispielsweise 0,9 Uimax. Die Zeitspanne(t1 bis t2) dient dem Anfahren der Vorerwärmung der Ionisationselektrode(4). Ab dem Zeitpunkt(t2) wird bis zum Zeitpunkt(t3) der Modulationsstrom(J) konstant gehalten. In dieser Zeitspanne(t2 bis t3) erhitzt sich die Ionisationselektrode(4) auf eine stabile Temperatur und gewährleistet dadurch reproduzierbare Meßwerte.The calibration process is carried out at time (t1) (see Fig. 3) from the event or operating hours counter during the transition from the full load level to the partial load level of the blower (2) started when the decreasing modulation current (J) reached a low value (Jk). It is then from the Control circuit (9) of the modulation current (J) and thus over the gas solenoid valve (3 ') increases the gas supply, causing the Ionization voltage (Ui) increases accordingly. To the At time (t2) the ionization voltage (Ui) reaches one predetermined value, for example 0.9 Uimax. The Time period (t1 to t2) serves to start the preheating the ionization electrode (4). From the time (t2) until the time (t3) the modulation current (J) remains constant held. During this period (t2 to t3) it heats up the ionization electrode (4) to a stable temperature and thereby guarantees reproducible measured values.

    Nach dem Zeitpunkt(t3) wird der Modulationsstrom(J) von der Regelschaltung(9) so weiter erhöht, daß der Maximalwert(Uimax) der Ionisationsspannung(Ui) überfahren wird. Dieser - neue - Maximalwert(Uimax) und/oder die sich in der Zeitspanne(t3 bis t4) ergebenden Meßwerte wird/werden zur Weiterverarbeitung im Kalibriervorgang gespeichert.After the time (t3) the modulation current (J) of the control circuit (9) increased so that the Drive over the maximum value (Uimax) of the ionization voltage (Ui) becomes. This - new - maximum value (Uimax) and / or the measured values resulting in the time period (t3 to t4) will be used for further processing in the calibration process saved.

    Der Modulationsstrom(J) wird weiter erhöht bis die Ionisationsspannung(Ui) wieder um etwa 10% unter dem Uimax-Wert liegt, was in Figur 3 zum Zeitpunkt(t4) der Fall ist. In der Zeitspanne(t3 bis t4) ist der Lambdawert der Verbrennung an sich ungünstig, was jedoch nicht ins Gewicht fällt, da diese Zeitspanne höchstens wenige Sekunden dauert. The modulation current (J) is increased further until the Ionization voltage (Ui) again about 10% below that Uimax value is what in Figure 3 at time (t4) Case is. The lambda value is in the period (t3 to t4) the incineration itself is unfavorable, but this does not ins Weight drops because this time span is at most a few Takes seconds.

    Nach dem Zeitpunkt(t4) schaltet die Regelschaltung(9) wieder auf den oben beschriebenen Regelvorgang zurück. Dieser setzt ein, wenn sich beim Zeitpunkt(t5) die Ionisationsspannung(Ui), der Modulationsstrom(J) und der Gasdruck(p) stabilisiert haben.After the time (t4), the control circuit (9) switches back to the control process described above. This starts when the (t5) Ionization voltage (Ui), the modulation current (J) and the Have stabilized gas pressure (p).

    Aus dem gespeicherten - neuen - Maximalwert der Ionisationsspannung bzw. aus den in der Zeitspanne(t3 bis t4) gewonnenen Meßwerten leitet die Regelschaltung(9) einen entsprechend angepaßten neuen Sollwert für die Ionisationsspannung ab.From the stored - new - maximum value of Ionization voltage or from the in the period (t3 to The control circuit (9) conducts the measured values obtained. a correspondingly adjusted new setpoint for the Ionization voltage.

    Aufgrund der genannten kurzen Abtastperiode der Regelschaltung(9) wird sich auch in der Zeitspanne(t3 bis t4) eine Serie von Meßwerten ergeben. Gegenüber den übrigen Meßwerten der Serie stark abweichende Meßwerte werden unterdrückt, weil sie auf externen elektrischen Störimpulsen beruhen können.Because of the short sampling period mentioned Control circuit (9) will also change in the period (t3 to t4) result in a series of measured values. Compared to the other measured values of the series strongly differing measured values are suppressed because they rely on external electrical Interference may be based.

    Um den Einfluß von nur vorübergehend auftretenden, zwar ungewöhnlichen, aber noch tolerierbaren Kalibrier-Meßwertserien zu vermindern, kann eine Mittelwertbildung zwischen der neuen Meßwertserie und den Meßwertserien vorhergehender Kalibriervorgänge vorgenommen werden.To the influence of only temporarily occurring, though unusual, but still tolerable calibration measurement series can decrease, averaging between the new measurement series and the measurement series previous calibration operations.

    Bevor mit dem neuen Kalibrierwert, der aus dem neuen Maximalwert der Ionisationsspannung oder aus der Meßwertserie abgeleitet sein kann, tatsächlich eine Neukalibrierung des Sollwertes der Ionisationsspannung vorgenommen wird, werden zwei Übergabekriterien von der Regelschaltung(9) geprüft.Before with the new calibration value, which from the new Maximum value of the ionization voltage or from the Series of measurements can actually be derived Recalibration of the setpoint of the ionization voltage is made, two handover criteria from the Control circuit (9) checked.

    Das erste Übergabekriterium erfaßt eine plötzliche Veränderung aller Komponenten des Regelkreises. Es ist erfüllt, wenn die Abweichung des neuen Kalibrierwertes von den früheren Kalibrierwerten ausreichend klein ist. The first transfer criterion covers a sudden one Change all components of the control loop. It is fulfilled if the deviation of the new calibration value is sufficiently small from the previous calibration values.

    Das zweite Übergabekriterium erfaßt eine "schleichende Drift" des Systems (Brenner-Regelung), das bei Abweichung von den herstellerseitig vorgesehenen Werten ausreichend klein ist.The second handover criterion records a "creeping Drift "of the system (burner control), which in the event of deviation sufficient from the values provided by the manufacturer is small.

    Nur wenn beide Übergabekriterien erfüllt sind, wird der Brennerbetrieb mit der Neukalibrierung fortgesetzt. Ist eines der Übergabekriterien nicht erfüllt, dann wird der Brennerbetrieb zunächst durch eine Regelabschaltung und nach mehrmaliger Wiederholung durch eine Störabschaltung unterbrochen.Only if both handover criteria are met will the Burner operation continued with recalibration. Is If one of the handover criteria is not met, then the Burner operation first through a control shutdown and after repeated repetition by a lockout interrupted.

    Claims (7)

    1. Method of controlling a gas burner, in particular a gas blower burner, having a measuring electrode, in particular ionisation electrode which sends an electrical variable, which is derived from the combustion temperature or the lambda value, to a control switch, which compares this variable to a selected electrical sct-point value and sets the gas-air ratio to a corresponding lambda set-point value, characterised in that after a certain operation time or at regular intervals, a calibration cycle is compulsorily run through, in which the lambda value is reduced from a value > 1 and in which the electrical variable (ionisation signal) produced is measured and its maximum value (A, B, C) is stored, and in that with this maximum value the electrical set-point value is reset in order that the control circuit is set to the same lambda set-point value.
    2. Method according to claim 1, characterised in that a calibration cycle is introduced respectively after a certain number of hours' operation or number of times that the gas burner is switched on.
    3. Method according to claim 1 or 2, characterised in that when the maximum value (A, B, C) lies outside a predetermined window (F), an alarm signal is given out.
    4. Method according to one of the preceding claims, characterised in that in the calibration cycle the lambda value passes from a value > 1 to a value below 1.
    5. Method according to one of the preceding claims, characterised in that in the calibration cycle the lambda value > 1 is at least as high as the lambda set-point value capable of being set.
    6. Method according to one of the preceding claims, characterised in that in each calibration cycle the control signal (J) for a gas magnet valve (3') is first brought to a value suitable for pre-heating of the ionisation electrode (4) and thereafter the control signal (J) is increased until the maximum value of the ionisation signal (Ui) has been passed through and the resulting value is evaluated for calibration.
    7. Circuit for controlling a gas burner, in particular gas blower burner, having a measuring electrode, in particular ionisation electrode, which sends an electrical measured variable corresponding to the combustion temperature or lambda value to the control circuit, in which case in the control circuit a comparator (10) compares the respective electrical measured variable to a set-point value generator (11) and sets the gas-air ratio to a lambda set-point value, characterised in that a changeover switch (13) interrupts the control and a slope generator (22) reduces the gas-air ratio on the basis of a lambda value > 1, in which case the electrical measured variable (U) passes through a curve (I, II, III) and in that a recognition and storage circuit (23, 24) detects and stores the value of the measured variable at the maximum (A, B, C) of the curve (I, II, III) and adjusts the set-point value generator (11) to this value as a base value.
    EP96115721A 1995-10-25 1996-10-01 Method and circuit for controlling a gas burner Expired - Lifetime EP0770824B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    DE19539568 1995-10-25
    DE19539568A DE19539568C1 (en) 1995-10-25 1995-10-25 Gas burner regulation system
    DE19618573 1996-05-09
    DE19618573A DE19618573C1 (en) 1996-05-09 1996-05-09 Gas burner regulating method controlled by ionisation electrode signal

    Publications (3)

    Publication Number Publication Date
    EP0770824A2 EP0770824A2 (en) 1997-05-02
    EP0770824A3 EP0770824A3 (en) 1998-04-15
    EP0770824B1 true EP0770824B1 (en) 2000-01-26

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP96115721A Expired - Lifetime EP0770824B1 (en) 1995-10-25 1996-10-01 Method and circuit for controlling a gas burner

    Country Status (5)

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    US (1) US5924859A (en)
    EP (1) EP0770824B1 (en)
    AT (1) ATE189301T1 (en)
    CA (1) CA2188616C (en)
    DE (1) DE59604283D1 (en)

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    EP1002997A2 (en) * 1998-11-20 2000-05-24 G. Kromschröder Aktiengesellschaft Method for controlling a fuel/air ratio of full premix gas burner
    EP1331444A2 (en) 2002-01-17 2003-07-30 Vaillant GmbH Method for regulating a gas burner
    EP1522790A2 (en) 2003-10-08 2005-04-13 Vaillant GmbH Method for Controlling a Gas Burner, in particular in Heating Installations with Blower
    DE102004055716A1 (en) * 2004-06-23 2006-01-12 Ebm-Papst Landshut Gmbh Firing equipment for gas burners has means for determining value dependent on measured temperature and means for regulating generated temperature using characteristic line representing value range corresponding to ideal temperature
    EP2014985A2 (en) 2007-07-13 2009-01-14 Vaillant GmbH Method of adjusting the air/fuel ratio for a gas fired burner
    DE102010008908A1 (en) * 2010-02-23 2011-08-25 Robert Bosch GmbH, 70469 A method of operating a burner and the air-frequency controlled modulating a burner power
    DE10300602B4 (en) * 2002-01-17 2012-01-05 Vaillant Gmbh Method for controlling a gas burner
    EP2405198A1 (en) 2010-07-08 2012-01-11 Vaillant GmbH Method for the calibration of the regulation of the fuel-air ratio of a gaseous fuel burner
    DE102010055567A1 (en) * 2010-12-21 2012-06-21 Robert Bosch Gmbh Method for stabilizing a performance of a gas-fired burner
    DE102013214610A1 (en) * 2013-07-26 2015-01-29 E.On New Build & Technology Gmbh Method and device for determining characteristic values of fuel gases
    DE102019119186A1 (en) 2019-01-29 2020-07-30 Vaillant Gmbh Method and device for controlling a fuel gas-air mixture in a heater
    EP3690318A2 (en) 2019-01-29 2020-08-05 Vaillant GmbH Method and device for regulating a fuel-air mixture in a heating device
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    DE59604283D1 (en) 2000-03-02
    ATE189301T1 (en) 2000-02-15
    US5924859A (en) 1999-07-20
    EP0770824A3 (en) 1998-04-15
    CA2188616A1 (en) 1997-04-26
    EP0770824A2 (en) 1997-05-02

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