EP3396248B1 - Method for detecting defects in a gas safety valve of heating devices - Google Patents

Method for detecting defects in a gas safety valve of heating devices Download PDF

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Publication number
EP3396248B1
EP3396248B1 EP18169736.8A EP18169736A EP3396248B1 EP 3396248 B1 EP3396248 B1 EP 3396248B1 EP 18169736 A EP18169736 A EP 18169736A EP 3396248 B1 EP3396248 B1 EP 3396248B1
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EP
European Patent Office
Prior art keywords
gas
safety valve
gas safety
heating devices
detecting defects
Prior art date
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Application number
EP18169736.8A
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German (de)
French (fr)
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EP3396248A1 (en
Inventor
Klaus Richter
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Vaillant GmbH
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Vaillant GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel 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
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air

Definitions

  • the invention relates to a diagnostic option for detecting faults in a gas safety valve in heating devices.
  • Burner systems for heating devices are monitored using so-called gas burner controls (GFA). If no flame is formed or detected after the ignition process, the GFA switches the heater into a fault state.
  • GFA gas burner controls
  • the patent application EP 0 778 448 A2 discloses a combustion control system for detecting an improper combustion condition.
  • the delay during the ignition process is detected by means of a flow sensor for the combustion air or the fuel gas.
  • the physical effect is used that a pressure wave spreads upstream in the gas and combustion air supply during ignition. If the measured flow rate falls below a specified value during ignition, correct ignition is assumed.
  • the heater 1 shown (for example a gas condensing boiler) is equipped with a burner system in which the gas and the combustion air are brought together in front of a blower 2. This mixture is then transported by the blower 2 to the burner 3, where the combustion then takes place.
  • a sensor 6 In the supply air duct 4 to the mixing point 5 of gas and air, a sensor 6 is attached, which gives an electrical signal proportional to the air flow to an electronic evaluation unit 7. In the event of a faulty ignition, this signal is evaluated by the evaluation electronics.
  • the gradient of the sensor signal is evaluated.
  • the sensor signal remains constant in the following seconds ( Fig. 2 ).
  • a negative gradient of the order of, for example, up to 10% of the measured value occurs for a few seconds when the sensor signals less than 2s ( Fig. 3 ).

Landscapes

  • 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)

Description

Die Erfindung betrifft eine Diagnosemöglichkeit zur Erkennung von Fehler an einem Gassicherheitsventil bei Heizgeräten.The invention relates to a diagnostic option for detecting faults in a gas safety valve in heating devices.

Brennersysteme von Heizgeräten werden mit Hilfe von sog. Gas-Feuerungsautomaten (GFA) überwacht. Wird nach dem Zündvorgang keine Flamme gebildet oder erkannt, schaltet der GFA den Heizer in einen Störzustand.Burner systems for heating devices are monitored using so-called gas burner controls (GFA). If no flame is formed or detected after the ignition process, the GFA switches the heater into a fault state.

Aus der Patentanmeldung EP 2 995 861 A1 ist ein Verfahren zur Diagnose einer Ventilanordnung mit seriell angeordneten Ventilen und mit einem Durchflusssensor bekannt. Es wird vorgeschlagen, nur eins der Ventile zu öffnen und dabei mit dem Sensor Leckströme zu detektieren. Damit kann die Dichtigkeit der geschlossenen Ventile erfasst werden.From the patent application EP 2 995 861 A1 a method for diagnosing a valve arrangement with serially arranged valves and with a flow sensor is known. It is proposed to open only one of the valves and to detect leakage currents with the sensor. This allows the tightness of the closed valves to be recorded.

Die Patentanmeldung EP 0 778 448 A2 offenbart ein Verbrennungsregelungssystem zur Erkennung eines unzulässigen Verbrennungszustandes. Dazu wird mittels eines Durchflusssensors für die Verbrennungsluft oder das Brenngas die Verzögerung während des Zündvorganges erfasst. Dabei wird der physikalische Effekt genutzt, dass sich bei der Zündung eine Druckwelle stromauf in der Gas- und Verbrennungsluftzufuhr ausbreitet. Fällt bei der Zündung der gemessene Durchfluss unter einen vorgegebenen Wert, wird von einer korrekten Zündung ausgegangen.The patent application EP 0 778 448 A2 discloses a combustion control system for detecting an improper combustion condition. For this purpose, the delay during the ignition process is detected by means of a flow sensor for the combustion air or the fuel gas. The physical effect is used that a pressure wave spreads upstream in the gas and combustion air supply during ignition. If the measured flow rate falls below a specified value during ignition, correct ignition is assumed.

Im Fall dass ein fehlender Gasfluss zum Brenner die Ursache für den Fehler ist, kann man nicht erkennen, ob dies auf ein nicht öffnendes Gassicherheitsventil zurückzuführen ist oder etwa ein Fehler in der Gaszuführung zum Heizgerät vorliegt. Oftmals werden in solchen Fällen intakte Gassicherheitsventile ausgetauscht.In the event that a lack of gas flow to the burner is the cause of the error, it cannot be recognized whether this is due to a non-opening gas safety valve or whether there is a fault in the gas supply to the heater. In such cases, intact gas safety valves are often replaced.

Diese Aufgabe wird gemäß den Merkmalen des Anspruchs 1 gelöst.This object is achieved according to the features of claim 1.

Die Erfindung wird nun anhand der Figuren detailliert erläutert.The invention will now be explained in detail with reference to the figures.

Das in Figur 1 gezeigte Heizgerät 1 (z.B. ein Gas-Brennwertgerät) ist mit einem Brennersystem ausgerüstet, bei dem vor einem Gebläse 2 das Gas und die Verbrennungsluft zusammengeführt werden. Dieses Gemisch wird dann von dem Gebläse 2 zum Brenner 3 transportiert, wo dann die Verbrennung stattfindet.This in Figure 1 The heater 1 shown (for example a gas condensing boiler) is equipped with a burner system in which the gas and the combustion air are brought together in front of a blower 2. This mixture is then transported by the blower 2 to the burner 3, where the combustion then takes place.

In dem Zuluftkanal 4 zur Mischstelle 5 von Gas und Luft ist ein Sensor 6 angebracht, der ein dem Luftstrom proportionales elektrisches Signal an eine Auswertelektronik 7 gibt. Dieses Signal wird im Falle einer fehlerhaften Zündung von der Auswerteelektronik ausgewertet.In the supply air duct 4 to the mixing point 5 of gas and air, a sensor 6 is attached, which gives an electrical signal proportional to the air flow to an electronic evaluation unit 7. In the event of a faulty ignition, this signal is evaluated by the evaluation electronics.

Anhand des Signalverlaufs während dieser Phase lässt sich erkennen:

  • ob das Gassicherheitsventil 8 geöffnet hat
  • ob der Gasfluss vor dem Heizgeräte gestört ist (z.B. durch Gasflussunterbrechung des in DE in der Hausinstallation hinter dem Gaszähler 10 vorgeschriebenen Strömungswächters 9)
  • ob die Zündung des Gemisches am Brenner zwar erfolgreich war, aber der Gas-Feuerungsautomat die Flamme nicht als solche erkannt hat
The signal curve during this phase shows:
  • whether the gas safety valve 8 has opened
  • whether the gas flow in front of the heater is disrupted (e.g. by interrupting the gas flow of the flow switch 9 prescribed in the house installation behind the gas meter 10)
  • whether the ignition of the mixture on the burner was successful, but the automatic burner control did not recognize the flame as such

Um die verschiedenen Zustände zu erkennen, wird der Gradient des Sensorsignals bewertet.In order to recognize the different states, the gradient of the sensor signal is evaluated.

In den Figuren 2 bis 4 sind die Gradienten des Sensorsignals für verschiedene Betriebszustände dargestellt.In the Figures 2 to 4 the gradients of the sensor signal are shown for different operating states.

Öffnet das Gassicherheitsventil nicht, bleibt das Sensorsignal in den folgenden Sekunden konstant (Fig. 2).If the gas safety valve does not open, the sensor signal remains constant in the following seconds ( Fig. 2 ).

Öffnet das Gasventil, aber in dem Gasweg vor dem Heizgerät liegt ein Fehler vor (z.B. ein schließender/geschlossener Strömungswächter), so kommt es bei Signal des Sensors für einige Sekunden zu einem negativen Gradienten in der Größenordnung von z.B. bis 10% des gemessenen Wertes innerhalb von weniger als 2s (Fig. 3).If the gas valve opens, but there is a fault in the gas path in front of the heater (e.g. a closing / closed flow switch), a negative gradient of the order of, for example, up to 10% of the measured value occurs for a few seconds when the sensor signals less than 2s ( Fig. 3 ).

War die Zündung des Brenners erfolgreich, aber der Gas-Feuerungsautomat hat die Flamme nicht erkannt, so kommt es zu einem Signalgradienten von deutlich mehr als z.B. 20 % des gemessenen Wertes innerhalb von weniger als 2s (Fig. 4).If the burner was ignited successfully, but the gas burner control did not recognize the flame, a signal gradient of significantly more than 20% of the measured value occurs within less than 2s ( Fig. 4 ).

BezugszeichenlisteReference list

11
Heizgerätheater
22nd
Gebläsefan
33rd
Brennerburner
44th
ZuluftkanalSupply air duct
55
MischstelleMixing point
66
Sensorsensor
77
AuswertelektronikEvaluation electronics
88th
GassicherheitsventilGas safety valve
99
StrömungswächterFlow switch
1010th
GaszählerGas meter

Claims (1)

  1. Method for detecting defects in a gas safety valve (8) of heating devices in the case of a faulty ignition, characterised by the steps
    - measuring the mass flow or volume flow of the combustion air supplied to a heating device (1) by means of a sensor (6)
    - forming the gradient of the measurement signal of the sensor (6)
    - assigning the course of the gradient to stored error images
    - recognising the error using the assigned gradient
    - outputting an error signal.
EP18169736.8A 2017-04-28 2018-04-27 Method for detecting defects in a gas safety valve of heating devices Active EP3396248B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017109176 2017-04-28

Publications (2)

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EP3396248A1 EP3396248A1 (en) 2018-10-31
EP3396248B1 true EP3396248B1 (en) 2020-03-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4056919A1 (en) 2021-03-11 2022-09-14 ebm-papst Landshut GmbH Heating device comprising a gas sensor and method for its operation
DE102022214201A1 (en) 2022-12-21 2024-06-27 Robert Bosch Gesellschaft mit beschränkter Haftung Method for operating a system for supplying air to a burner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019107369A1 (en) * 2019-03-22 2020-09-24 Vaillant Gmbh Procedure for checking the presence of a non-return valve in a heating system
DE102022103736A1 (en) * 2022-02-17 2023-08-17 Vaillant Gmbh Procedure for starting up a heater, computer program, regulation and control device, heater and use of a parameter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3366516B2 (en) * 1995-12-06 2003-01-14 株式会社山武 Combustion control device
DE102004004065B4 (en) * 2003-01-30 2015-10-01 Vaillant Gmbh Method for preventive fault detection in electronically controlled or controlled heating appliances
DE102008006120B4 (en) * 2008-01-25 2016-08-18 Eberspächer Climate Control Systems GmbH & Co. KG Method for detecting a flow restriction in the combustion air flow path and / or in the exhaust gas flow path of a fuel-operated heater, in particular for a vehicle
PL2995861T3 (en) * 2014-09-10 2020-01-31 Siemens Aktiengesellschaft Valve operation and diagnosis

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4056919A1 (en) 2021-03-11 2022-09-14 ebm-papst Landshut GmbH Heating device comprising a gas sensor and method for its operation
DE102021105962A1 (en) 2021-03-11 2022-09-15 Ebm-Papst Landshut Gmbh Heating device having a gas sensor and method for its operation
DE102022214201A1 (en) 2022-12-21 2024-06-27 Robert Bosch Gesellschaft mit beschränkter Haftung Method for operating a system for supplying air to a burner

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