EP2295863A2 - Combustion system, automatic gas ignition device and device and method for interrupting a fuel supply for same - Google Patents
Combustion system, automatic gas ignition device and device and method for interrupting a fuel supply for same Download PDFInfo
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- EP2295863A2 EP2295863A2 EP10172195A EP10172195A EP2295863A2 EP 2295863 A2 EP2295863 A2 EP 2295863A2 EP 10172195 A EP10172195 A EP 10172195A EP 10172195 A EP10172195 A EP 10172195A EP 2295863 A2 EP2295863 A2 EP 2295863A2
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- independent
- abschaltweg
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- fuel supply
- switch
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- 239000000446 fuel Substances 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 238000012806 monitoring device Methods 0.000 claims abstract description 3
- 230000001419 dependent effect Effects 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 abstract 2
- 230000007547 defect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001010 compromised effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 210000002023 somite Anatomy 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/04—Fail safe for electrical power failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/10—Fail safe for component failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
Definitions
- the invention relates to a method for interrupting a fuel supply to a combustion system by means of valves controlled by a gas burner control device, in the presence of a safety concern and / or a fault according to the preamble of patent claim 1.
- the invention relates to a device for interrupting a fuel supply to a combustion system by means of controlled by a gas burner control valves, in the presence of a safety concern and / or a fault, according to the preamble of claim 5.
- the invention also relates to a gas burner control unit for safe operation of a combustion system, according to the preamble of claim 10.
- the invention relates to a combustion system, in particular a combustion system with a gas burner, according to the preamble of claim 11.
- overvoltage protection is provided on a power supply unit supplying the automatic gas burner.
- the overvoltage protection is usually achieved with Zener diodes or suppressor diodes connected in parallel with the logic supply.
- this overvoltage protection is very inaccurate, which can be damaged very easily to be supplied logic components such as microcontroller, so-called watchdogs, etc., thereby reducing the safety of the automatic burner control.
- GFA automatic gas burner control
- Third or multiple static errors are: In the event of such an error, it happens that e.g. several ports of a microcontroller keep their state permanently or that a microcontroller or the like by overvoltage, EMC pulse. permanently persisted in a current state, without leaving it again. This error consideration should be taken into account when revising the EN 298 standard.
- the invention has for its object to provide a combustion system, a gas burner control, a device and a method for interrupting a fuel supply, in which the logic and / or switching parts are securely protected and unintentional opening of a fuel supply (gas valves) is reliably prevented.
- the inventive method for interrupting a fuel supply to a combustion system by means of controlled by a gas burner control valves, in the presence of a safety concern and / or a fault, wherein the interruption is performed via at least two independent Abschaltwege is characterized in that at least one independent monitoring at least one of independent Abschaltwege via a third, coupled to at least one of the independent Abschaltwege shutdown is performed to ensure a fault in at least one of the shutdown a safe interruption of the fuel supply.
- the at least two switch-off paths are respectively monitored via at least one independent monitoring device.
- the third shutdown path is triggered with at least the first and / or the second shutdown path.
- Yet another embodiment of the present invention contemplates that the third shutdown path discontinues fueling when a dynamic signal generated by the at least one coupled independent shutdown path fails.
- the device according to the invention for interrupting a fuel supply to a combustion system by means of valves controlled by a gas burner control, in the presence of a safety concern and / or a fault, wherein at least two independent shutdown paths are provided for interrupting the fuel supply, characterized in that means for carrying out a method according to the invention are provided, wherein the means comprise at least one coupled to at least one of the independent Abschaltwege, a dependent, in particular third Abschaltweg controlling safety device to ensure a reliable interruption of the fuel supply in the presence of a fault in the at least one independent Abschaltweg.
- the dependent Abschaltweg coupled via a dynamic signal with at least one of the independent Abschaltwege, in particular triggered.
- the third switch-off path comprises a switch for interrupting the voltage and / or current supply of the valves, the switch being switchable as a function of a trigger signal.
- the dependent shutdown path comprises at least one system base chip, in particular a watchdog IC or guard dog IC, for monitoring the coupled independent shutdown path (IC: integrated circuit).
- the safety device has at least two independent shutdown paths each a power failure protection, in particular an overvoltage protection.
- the automatic gas burner control unit according to the invention for safe operation of a combustion system, with switching means, is characterized in that the switching means comprise at least one device according to the invention.
- the combustion system according to the invention is characterized in that at least one gas burner control device according to the invention is provided.
- This safety device or controlled by her third Abschaltweg interrupt the voltage or power supply of the fuel valves by means of a separate switch as soon as a normal operating conditions of at least one of the two shutdown regularly emitted trigger signal now in case of failure of these no longer sent and therefore no longer received by the third shutdown. This reliably shuts off the fuel supply and reliably precludes an unsafe operating state.
- Fig. 1 schematically shows in a block diagram a circuit arrangement of a device 1 for a gas fire engine.
- a gas supply takes place in accordance with the position of two safety solenoid valves 14, which are fed by a power supply 12.
- the safety solenoid valves 14 close and thus interrupt a gas supply.
- the device 1 comprises a safety device 4 having a first shut-off path 2, a second shut-off path 3 and a third shut-off path 5 according to the invention.
- the shut-off paths 2, 3, 5 each comprise a logic circuit or a microcontroller 17, 10, 6, wherein each microcontroller with at least one switch 16, 11, 19 for interrupting a power supply of the safety solenoid valves 14 cooperates.
- the microcontroller 6, 10 and 17 are each supplied in the illustrated embodiment by its own power source. For redundant design of the safety device 4, this at least for at least two independent shutdown paths 2, 3 depending on a power failure protection 7, in particular an overvoltage protection, on, here only one is shown schematically.
- the first shut-off path 2 and the second shut-off path 3 are connected via corresponding lines 8 to an ionization detection circuit 9.
- a heat demand as shown by the arrow P, also sent to the microcontroller 17, which switches the coupled components accordingly. ever After heat demand, the microcontroller 17 switches the safety solenoid valves 14, whereby the fuel supply is regulated or adjusted according to a safety solenoid valve position 14.
- the first shut-off path 2 and the second shut-off path 3 are connected via corresponding lines 8 to an ionization detection circuit 9.
- the second shutdown 3 includes according to the embodiment of Fig. 1 an ASIC, microcontroller or watchdog logic device 10 (ASIC: application specific integrated circuit). This is in turn coupled to a so-called high-side switch 11, which switches or interrupts a power supply 12 for safety solenoid valves 14. Downstream of the highside switch 11 is a gas fitting 13.
- the gas fitting 13 comprises the two safety solenoid valves 14, which regulate a corresponding switching of the fuel supply.
- the safety solenoid valves 14 may be connected in parallel, as shown.
- the safety solenoid valves 14 are coupled via a safety temperature limiter 15 to the highside switch 11. Downstream of the safety solenoid valves 14 is a respective switch 16 of the first Abschaltweges 2.
- the switches 16 are controlled by a microcontroller or short microcontroller 17, which is included in the first Abschaltweg 2.
- the microcontroller 17 controls via a corresponding circuit 18, here a logical AND circuit, the power supply to the safety solenoid valves 14 so that a fuel supply according to the first Abschaltweg 2 by switching the switch 11 and thus the power supply to the safety solenoid valves 14 is switchable.
- a heat demand as shown by the arrow P, also sent to the microcontroller 17, which switches the coupled components accordingly.
- the microcontroller 17 switches the safety solenoid valves 14, whereby the fuel supply is regulated or adjusted according to a safety solenoid valve position 14.
- the microcontroller 17 thus processes the heat requirements and operates the burner.
- the microcontroller 17 is the watchdog, ASIC or microcontroller 10 of the second shutdown 3, which in the embodiment according to Fig. 1 the flame of a burner monitored by a flame signal (ionization).
- the safety device 4 With the first shutdown 2, the safety device 4, more precisely, the third shutdown 5 of the safety device 4 is coupled.
- the third shutdown path 5 includes the system base chip 6, which is designed here as a watchdog.
- the watchdog 6 is triggered by the microcontroller 17 regularly, for example via a dynamic signal. If the watchdog 6 is not triggered, it opens a low-side switch 19, whereby the magnetic safety valves 14 are closed. Thus, the system is brought into a safe state even in the case of third static errors.
- the watchdog 6 of the third shutdown can be configured as a time-out watchdog, a time-window watchdog or a smart watchdog with question-answer protocol.
- the low-side switch 19 preferably comprises an N-channel power MOSFET (MOSFET: metal-oxide-semiconductor field-effect transistor).
- the safety device 4 also includes a power failure protection 7, which is integrated here as overvoltage protection in the logic module 10.
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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)
- Feeding And Controlling Fuel (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Unterbrechen einer Brennstoffzufuhr zu einem Verbrennungssystems mittels von einem Gasfeuerungsautomaten gesteuerten Ventilen, bei Vorliegen eines Sicherheitsbedenkens und/oder einer Störung nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for interrupting a fuel supply to a combustion system by means of valves controlled by a gas burner control device, in the presence of a safety concern and / or a fault according to the preamble of
Weiter betrifft die Erfindung eine Vorrichtung zum Unterbrechen einer Brennstoffzufuhr zu einem Verbrennungssystems mittels von einem Gasfeuerungsautomaten gesteuerten Ventilen, bei Vorliegen eines Sicherheitsbedenkens und/oder einer Störung, gemäß dem Oberbegriff des Anspruchs 5.Furthermore, the invention relates to a device for interrupting a fuel supply to a combustion system by means of controlled by a gas burner control valves, in the presence of a safety concern and / or a fault, according to the preamble of claim 5.
Auch betrifft die Erfindung einen Gasfeuerungsautomat zum sicheren Betreiben eines Verbrennungssystems, gemäß dem Oberbegriff des Anspruchs 10.The invention also relates to a gas burner control unit for safe operation of a combustion system, according to the preamble of
Zudem betrifft die Erfindung ein Verbrennungssystem, insbesondere ein Verbrennungssystem mit einem Gasbrenner, gemäß dem Oberbegriff des Anspruchs 11.In addition, the invention relates to a combustion system, in particular a combustion system with a gas burner, according to the preamble of
Verbrennungssysteme, Gasfeuerungsautomaten sowie Verfahren und Vorrichtungen zum Unterbrechen einer Brennstoffzufuhr sind allgemein aus dem Stand der Technik bekannt.Combustion systems, automatic gas burner control systems and methods for interrupting fuel supply are generally known in the art.
Bei diesen bekannten Lösungen sind zwei unabhängige Abschaltwege vorgesehen. Hierbei weisen nur wenige Lösungen einen Überspannungsschutz auf, welche bei einer fehlerhaften oder unterbochenen Stromzufuhr ein ungewolltes Öffnen einer Gaszufuhrunterbrechung verhindern. In einer bekannten Lösung ist ein Überspannungsschutz an einem den Gasfeuerungsautomaten versorgenden Netzteil vorgesehen.In these known solutions two independent shutdown paths are provided. In this case, only a few solutions have an overvoltage protection, which prevent unintentional opening of a gas supply interruption in the event of a faulty or interrupted power supply. In a known solution, overvoltage protection is provided on a power supply unit supplying the automatic gas burner.
Der Überspannungsschutz wird in der Regel mit Z-Dioden oder Suppressor-Dioden, die parallel zur Logikversorgung geschaltet sind, erreicht. Dieser Überspannungsschutz ist jedoch sehr ungenau, wodurch zu versorgende Logikteile wie Mikrocontroller, sogenannte Watchdogs etc. sehr leicht beschädigt werden können und dadurch die Sicherheit des Gasfeuerungsautomaten verringern.The overvoltage protection is usually achieved with Zener diodes or suppressor diodes connected in parallel with the logic supply. However, this overvoltage protection is very inaccurate, which can be damaged very easily to be supplied logic components such as microcontroller, so-called watchdogs, etc., thereby reducing the safety of the automatic burner control.
Auch sind Gasfeuerungsautomaten (GFA) bekannt, die nur einen ihrer Abschaltwege, z.B. mit Hilfe einer internen Spannungsregelung, vor Überspannung schützen. Hier versagt der Gasfeuerungsautomat bei einer weitergehenden Betrachtung nach Europäischer Norm EN 298 (9.1.6.2), wenn dieser Abschaltweg bereits als defekt angenommen wird und eine Überspannung auftritt die den Rest der GFA-Schaltung gefährdet. Häufig ist der Überspannungsschutz nur eine redundante Maßnahme, die nicht prüfbar ist. Wird der Überspannungsschutz innerhalb der Lebensdauer des GFA aus irgendeinem Grund unwirksam, ist die Sicherheit des GFA gefährdet.Also known are automatic gas burner control (GFA) systems that only have one of their shutdown paths, e.g. protect against overvoltage with the aid of an internal voltage regulation. In this case, the automatic gas burner control system fails on further consideration according to European Standard EN 298 (9.1.6.2), if this switch-off path is already assumed to be defective and an overvoltage occurs which endangers the rest of the GFA circuit. Often the overvoltage protection is just a redundant measure that can not be tested. If the overvoltage protection becomes ineffective for any reason within the lifetime of the GFA, the safety of the GFA is compromised.
Bei Versagen lässt sich ein dritt- und mehrfach statischer Fehler nicht ausschließen. Bei dritt- oder mehrfach statischen Fehlern handelt es sich um Folgendes: Bei einem derartigen Fehlerfall kommt es vor, dass z.B. mehrere Ports eines Mikrocontrollers ihren Zustand dauerhaft behalten oder dass ein Mikrocontroller durch Überspannung, EMV-Puls o.ä. in einem aktuellen Zustand dauerhaft verharrt, ohne diesen wieder zu verlassen. Diese Fehlerbetrachtung soll bei einer Überarbeitung der Norm EN 298 berücksichtigt werden.In case of failure, a third and multiple static error can not be ruled out. Third or multiple static errors are: In the event of such an error, it happens that e.g. several ports of a microcontroller keep their state permanently or that a microcontroller or the like by overvoltage, EMC pulse. permanently persisted in a current state, without leaving it again. This error consideration should be taken into account when revising the EN 298 standard.
Der Erfindung liegt die Aufgabe zugrunde, ein Verbrennungssystem, einen Gasfeuerungsautomaten, eine Vorrichtung und ein Verfahren zum Unterbrechen einer Brennstoffzufuhr zu schaffen, bei denen die Logik- und/oder Schaltteile sicher geschützt sind und ein unbeabsichtigtes Öffnen einer Brennstoffzufuhr (Gasventile) sicher verhindert ist.The invention has for its object to provide a combustion system, a gas burner control, a device and a method for interrupting a fuel supply, in which the logic and / or switching parts are securely protected and unintentional opening of a fuel supply (gas valves) is reliably prevented.
Erfindungsgemäß wird dies durch die Gegenstände mit den Merkmalen des Patentanspruches 1, des Patentanspruchs 5, des Patentanspruchs 10 und des Patentanspruchs 11 gelöst. Vorteilhafte Weiterbildungen sind den Unteransprüchen zu entnehmen.This is achieved by the objects with the features of
Das erfindungsgemäße Verfahren zum Unterbrechen einer Brennstoffzufuhr zu einem Verbrennungssystem mittels von einem Gasfeuerungsautomaten gesteuerten Ventilen, bei Vorliegen eines Sicherheitsbedenkens und/oder einer Störung, wobei das Unterbrechen über mindestens zwei unabhängige Abschaltwege durchgeführt wird, ist dadurch gekennzeichnet, dass mindestens eine unabhängige Überwachung mindestens eines der unabhängigen Abschaltwege über einen dritten, mit mindestens einem der unabhängigen Abschaltwege gekoppelten Abschaltweg durchgeführt wird, um bei Störung in mindestens einem der Abschaltwege eine sichere Unterbrechung der Brennstoffzufuhr zu gewährleisten.The inventive method for interrupting a fuel supply to a combustion system by means of controlled by a gas burner control valves, in the presence of a safety concern and / or a fault, wherein the interruption is performed via at least two independent Abschaltwege is characterized in that at least one independent monitoring at least one of independent Abschaltwege via a third, coupled to at least one of the independent Abschaltwege shutdown is performed to ensure a fault in at least one of the shutdown a safe interruption of the fuel supply.
In einer Ausführungsform des erfindungsgemäßen Verfahrens ist vorgesehen, dass die mindestens zwei Abschaltwege jeweils über mindestens eine unabhängige Überwachungseinrichtung überwacht werden.In one embodiment of the method according to the invention, it is provided that the at least two switch-off paths are respectively monitored via at least one independent monitoring device.
In einer anderen Ausführungsform der vorliegenden Erfindung ist vorgesehen, dass der dritte Abschaltweg mit bzw. von mindestens dem ersten und/oder dem zweiten Abschaltweg getriggert wird.In another embodiment of the present invention, it is provided that the third shutdown path is triggered with at least the first and / or the second shutdown path.
Wiederum eine andere Ausführungsform der vorliegenden Erfindung sieht vor, dass der dritte Abschaltweg die Brennstoffzufuhr unterbricht, wenn ein von dem mindestens einen gekoppelten unabhängigen Abschaltweg generiertes dynamisches Signal ausbleibt.Yet another embodiment of the present invention contemplates that the third shutdown path discontinues fueling when a dynamic signal generated by the at least one coupled independent shutdown path fails.
Die erfindungsgemäße Vorrichtung zum Unterbrechen einer Brennstoffzufuhr zu einem Verbrennungssystems mittels von einem Gasfeuerungsautomaten gesteuerten Ventilen, bei Vorliegen eines Sicherheitsbedenkens und/oder einer Störung, wobei mindestens zwei unabhängige Abschaltwege zum Unterbrechen der Brennstoffzufuhr vorgesehen sind, ist dadurch gekennzeichnet, dass Mittel zum Durchführen eines erfindungsgemäßen Verfahrens vorgesehen sind, wobei die Mittel mindestens eine, mit mindestens einem der unabhängigen Abschaltwege gekoppelte, einen abhängigen, insbesondere dritten Abschaltweg beherrschende Sicherheitseinrichtung umfassen, um bei Vorliegen einer Störung in dem mindestens einen unabhängigen Abschaltweg eine sichere Unterbrechung der Brennstoffzufuhr zu gewährleisten.The device according to the invention for interrupting a fuel supply to a combustion system by means of valves controlled by a gas burner control, in the presence of a safety concern and / or a fault, wherein at least two independent shutdown paths are provided for interrupting the fuel supply, characterized in that means for carrying out a method according to the invention are provided, wherein the means comprise at least one coupled to at least one of the independent Abschaltwege, a dependent, in particular third Abschaltweg controlling safety device to ensure a reliable interruption of the fuel supply in the presence of a fault in the at least one independent Abschaltweg.
In noch einer weiteren Ausführungsform der vorliegenden Erfindung ist vorgesehen, dass der abhängige Abschaltweg über ein dynamisches Signal mit mindestens einem der unabhängigen Abschaltwege gekoppelt, insbesondere getriggert, ist.In yet another embodiment of the present invention, it is provided that the dependent Abschaltweg coupled via a dynamic signal with at least one of the independent Abschaltwege, in particular triggered.
In einem weiteren Ausführungsbeispiel der Erfindung ist vorgesehen, dass der dritte Abschaltweg einen Schalter zum Unterbrechen der Spannungs- und/oder Stromversorgung der Ventile umfasst, wobei der Schalter in Abhängigkeit eines Triggersignales schaltbar ist.In a further exemplary embodiment of the invention, it is provided that the third switch-off path comprises a switch for interrupting the voltage and / or current supply of the valves, the switch being switchable as a function of a trigger signal.
Wiederum eine weiteres Ausführungsbeispiel der vorliegenden Erfindung sieht vor, dass der abhängige Abschaltweg mindestens einen System-Basis-Chip, insbesondere einen Watchdog-IC oder Wachhund-IC, zum Überwachen des gekoppelten unabhängigen Abschaltweges umfasst (IC: integrierter Schaltkreis, englisch integrated circuit).Yet another embodiment of the present invention provides that the dependent shutdown path comprises at least one system base chip, in particular a watchdog IC or guard dog IC, for monitoring the coupled independent shutdown path (IC: integrated circuit).
Noch eine weitere Ausführungsform der vorliegenden Erfindung sieht vor, dass die Sicherheitseinrichtung mindestens für mindestens zwei unabhängige Abschaltwege je einen Stromausfallschutz, insbesondere einen Überspannungsschutz, aufweist.Yet another embodiment of the present invention provides that the safety device has at least two independent shutdown paths each a power failure protection, in particular an overvoltage protection.
Der erfindungsgemäße Gasfeuerungsautomat zum sicheren Betreiben eines Verbrennungssystems, mit Schaltmitteln, ist dadurch gekennzeichnet, dass die Schaltmittel mindestens eine erfindungsgemäße Vorrichtung umfassen.The automatic gas burner control unit according to the invention for safe operation of a combustion system, with switching means, is characterized in that the switching means comprise at least one device according to the invention.
Das erfindungsgemäße Verbrennungssystem, ist dadurch gekennzeichnet, dass mindestens ein erfindungsgemäßer Gasfeuerungsautomat vorgesehen ist.The combustion system according to the invention is characterized in that at least one gas burner control device according to the invention is provided.
Mit dem erfindungsgemäßen Verfahren, der erfindungsgemäßen Vorrichtung, dem erfindungsgemäßen Gasfeuerungsautomaten und dem erfindungsgemäßen Verbrennungssystem werden insbesondere die folgenden Vorteile realisiert:
- Durch den dritten Abschaltweg lassen sich gefährliche Betriebszustände, wie sie bei Vorliegen von dritt- und/oder mehrfach statischen Fehlern verursacht werden können, vermeiden, was sonst zu einem ungewollten Öffnen oder Offenhalten von Stellgliedern wie Ventilen sowie zu einer ungewollten Brennstoffzufuhr führen würde. Durch die Kopplung der Abschaltwege ist ein redundantes System geschaffen, welches sicher ausgebildet ist. Durch die Redundanz ist ein sicheres Gesamtsystem auf einfache Weise realisiert.
- The third shutdown can be dangerous operating conditions, as they can be caused in the presence of third and / or multiple static errors, avoid what would otherwise lead to an unwanted opening or keeping open of actuators such as valves and to an unwanted fuel supply. By coupling the Abschaltwege a redundant system is created, which is securely formed. Due to the redundancy, a secure overall system is realized in a simple manner.
Nach dem Stand der Technik sind Verfahren bekannt, bei denen zwei unabhängige Abschaltwege sich gegenseitig überwachen und bei Feststellung eines Defekts des jeweils anderen überwachten Abschaltweges die Brennstoffzufuhr unterbrechen. Hier besteht die Gefahr, dass bei Vorliegen eines Defekts bei einem ersten Abschaltweg (beispielsweise fest durchgeschaltete Schalter der Magnetventile, verschweißte Kontakte, durchlegierte Transistoren) ein weiterer Defekt bei einem zweiten Abschaltweg zwar erkannt, auf diesen Defekt aber nicht mehr durch Abschalten mittels des ersten Abschaltweges reagiert werden könnte. Diese Unsicherheit soll in absehbarer Zeit durch eine überarbeitete Norm EN 298 ausgeschlossen werden. Die hier vorgestellte Erfindung löst dieses Problem, indem mindestens einer der beiden herkömmlichen Abschaltwege von einer zusätzlichen Sicherheitseinrichtung überwacht wird. Diese Sicherheitseinrichtung bzw. ein von ihr beherrschter dritter Abschaltweg unterbrechen die Spannungs- bzw. Stromversorgung der Brennstoffventile mittels eines eigenen Schalters, sobald ein unter normalen Betriebsumständen von mindestens einem der beiden Abschaltwege regelmäßig ausgesandtes Triggersignal nun im Störungsfall von diesen nicht mehr ausgesandt und daher vom dritten Abschaltweg auch nicht mehr empfangen wird. Damit wird die Brennstoffversorgung sicher unterbrochen und ein unsicherer Betriebszustand sicher ausgeschlossen.According to the prior art, methods are known in which two independent shutdown paths monitor each other and interrupt the fuel supply upon detection of a defect in the other monitored Abschaltweges. Here there is a danger that in the presence of a defect in a first Abschaltweg (for example, permanently switched switch the solenoid valves, welded contacts, alloyed transistors) yet another defect in a second Abschaltweg recognized on this defect but not by switching off by the first Abschaltweges could be reacted. This uncertainty should be ruled out in the foreseeable future by a revised standard EN 298. The invention presented here solves this problem by monitoring at least one of the two conventional switch-off paths by an additional safety device. This safety device or controlled by her third Abschaltweg interrupt the voltage or power supply of the fuel valves by means of a separate switch as soon as a normal operating conditions of at least one of the two shutdown regularly emitted trigger signal now in case of failure of these no longer sent and therefore no longer received by the third shutdown. This reliably shuts off the fuel supply and reliably precludes an unsafe operating state.
Die Zeichnungen stellen mehrere Ausführungsbeispiele der Erfindung dar und zeigen in den Figuren:
- Fig. 1
- schematisch in einem Blockdiagramm ein Schaltungsanordnung einer Vorrichtung für einen Gasfeuerautomaten und
- Fig. 2
- schematisch in einem Blockdiagramm eine andere Schaltungsanordnung einer Vorrichtung für einen Gasfeuerautomaten.
- Fig. 1
- schematically a block diagram of a circuit arrangement of a device for a gas automatic burner and
- Fig. 2
- schematically a block diagram of another circuit arrangement of a device for a gas burner control.
Um sicherzustellen, dass bei Störungen und/oder Vorliegen von Sicherheitsbedenken eine Gaszufuhr unterbrochen wird, umfasst die Vorrichtung 1 eine Sicherheitseinrichtung 4 mit einem ersten Abschaltweg 2, einem zweiten Abschaltweg 3 und einem erfindungsgemäßen dritten Abschaltweg 5. Die Abschaltwege 2, 3, 5 umfassen jeweils eine Logikschaltung oder einen Microcontroller 17, 10, 6, wobei jeder Mikrocontroller mit mindestens einem Schalter 16, 11, 19 zur Unterbrechung einer Stromversorgung der Sicherheitsmagnetventile 14 zusammenwirkt. Die Microcontroller 6, 10 und 17 werden in dem dargestellten Ausführungsbeispiel jeweils von einer eigenen Spannungsquelle versorgt. Zur redundanten Ausbildung der Sicherheitseinrichtung 4 weist diese mindestens für mindestens zwei unabhängige Abschaltwege 2, 3 je einen Stromausfallschutz 7, insbesondere einen Überspannungsschutz, auf, wobei hier nur einer schematisch dargestellt ist.To ensure that a gas supply is interrupted in the event of faults and / or safety concerns, the
Der erste Abschaltweg 2 und der zweite Abschaltweg 3 sind über entsprechende Leitungen 8 mit einer lonisationsdetektionsschaltung 9 verbunden.The first shut-off path 2 and the second shut-off path 3 are connected via
Eine Wärmeforderung wird, wie durch den Pfeil P dargestellt, ebenfalls an den Mikrocontroller 17 gesendet, der entsprechend die gekoppelten Komponenten schaltet. Je nach Wärmeforderung schaltet der Mikrocontroller 17 die Sicherheitsmagnetventile 14, wodurch die Brennstoffzufuhr entsprechend einer Sicherheitsmagnetventilstellung 14 geregelt oder eingestellt wird.A heat demand, as shown by the arrow P, also sent to the
Im Folgenden ist der Aufbau detaillierter beschrieben. Der erste Abschaltweg 2 und der zweite Abschaltweg 3 sind über entsprechende Leitungen 8 mit einer lonisationsdetektionsschaltung 9 verbunden. Der zweite Abschaltweg 3 umfasst gemäß dem Ausführungsbeispiel nach
Der Mikrocontroller 17 bearbeitet somit die Wärmeforderungen und betreibt den Brenner. Demgegenüber steht dem Mikrocontroller 17 der Watchdog, ASIC oder Mikrocontroller 10 des zweiten Abschaltweges 3, der in dem Ausführungsbeispiel nach
Die Sicherheitseinrichtung 4 umfasst zudem einen Stromausfallschutz 7, der hier als Überspannungsschutz in dem Logikbaustein 10 integriert ist.The safety device 4 also includes a
Der Watchdog 6 des dritten Abschaltwegs 5 baut auf ein retriggerbares Monoflop 6a auf.Der Mikrocontroller 17 muss das Monoflop 6a regelmäßig durch einen Puls triggern. Tut er das nicht, schaltet das Monoflop 6a über seinen AusgangQ ein MOSFET 19 ab und sperrt dieStromversorgung der Gasventile 14. Das Monoflop 6a wird über die Kombination von Widerstand Rv und Spannung Uz vor Überspannungen auf der Ventilversorgung geschützt und stellt somit eine Abschaltung sicher, insbesondere wenn die anderen Abschaltwege 2, 3 durch Überspannung der5V Logikversorgung 21 bereits zerstört wurden. Eine Fehlerbetrachtung nach Norm EN 298 in dieser Kombination führt zum Erkennen des Fehlers. Der Widerstand Rp schützt zusätzlich den Monoflop Eingang A vor Überspannung seitens desMikrocontrollers 17. Der Widerstand Ra verhindert ein schwebendes Signal bei defektem Mikrocontroller 17.
- The
watchdog 6 of the third shutdown 5 builds on a retriggerable monoflop 6a. Themicrocontroller 17 must regularly trigger the monoflop 6a by a pulse. If this is not done, the monoflop 6a switches off aMOSFET 19 via its output Q and blocks the power supply of thegas valves 14. The monoflop 6a is protected against overvoltages on the valve supply via the combination of resistor Rv and voltage Uz, thus ensuring a shutdown , Especially if the other shutdown 2, 3 were already destroyed by overvoltage of the5V logic supply 21. An error analysis according to standard EN 298 in this combination leads to the recognition of the error. The resistor Rp additionally protects the monoflop input A from overvoltage on the part of themicrocontroller 17. The resistor Ra prevents a floating signal when themicrocontroller 17 is defective.
Claims (11)
dadurch gekennzeichnet, dass mindestens eine unabhängige Überwachung mindestens eines der unabhängigen Abschaltwege (2; 3) über einen dritten, mit mindestens einem der unabhängigen Abschaltwege (2, 3) gekoppelten Abschaltweg (5) durchgeführt wird, um bei Störung in mindestens einem der Abschaltwege (2, 3) eine sichere Unterbrechung der Brennstoffzufuhr zu gewährleisten.Method for interrupting a fuel supply to a combustion system by means of valves controlled by a gas-fired automatic burner, in the presence of a safety concern and / or a fault, wherein the interruption is carried out via at least two independent shut-off paths (2, 3),
characterized in that at least one independent monitoring of at least one of the independent switch-off paths (2; 3) is carried out via a third switch-off path (5) coupled to at least one of the independent switch-off paths (2, 3) in order to be able to interrupt at least one of the switch-off paths ( 2, 3) to ensure a safe interruption of the fuel supply.
dadurch gekennzeichnet, dass die mindestens zwei Abschaltwege (2, 3) jeweils über mindestens eine unabhängige Überwachungseinrichtung überwacht werden.Method according to claim 1,
characterized in that the at least two shutdown paths (2, 3) are each monitored via at least one independent monitoring device.
dadurch gekennzeichnet, dass der dritte Abschaltweg (5) mit mindestens dem ersten und/oder dem zweiten Abschaltweg (2, 3) getriggert wird.Method according to claim 1 or 2,
characterized in that the third Abschaltweg (5) with at least the first and / or the second Abschaltweg (2, 3) is triggered.
dadurch gekennzeichnet, dass der dritte Abschaltweg (5) die Brennstoffzufuhr unterbricht, wenn ein von dem mindestens einen gekoppelten unabhängigen Abschaltweg (2, 3) generiertes dynamisches Signal ausbleibt.Method according to one of claims 1 to 3,
characterized in that the third Abschaltweg (5) interrupts the fuel supply when a of the at least one coupled independent Abschaltweg (2, 3) generated dynamic signal is missing.
dadurch gekennzeichnet, dass Mittel zum Durchführen eines Verfahrens nach einem der Ansprüche 1 bis 4 vorgesehen sind, wobei die Mittel mindestens eine, mit mindestens einem der unabhängigen Abschaltwege (2, 3) gekoppelte, einen abhängigen, insbesondere dritten Abschaltweg beherrschende Sicherheitseinrichtung (4) umfassen, um bei Vorliegen einer Störung in dem mindestens einen unabhängigen Abschaltweg (2, 3) eine sichere Unterbrechung der Brennstoffzufuhr zu gewährleisten.Apparatus (1) for interrupting a fuel supply to a combustion system in the presence of a safety concern and / or a fault by means of valves controlled by a gas burner control apparatus, wherein at least two independent shut-off paths (2, 3) are provided for interrupting the fuel supply,
characterized in that means for carrying out a method according to one of claims 1 to 4 are provided, wherein the means comprise at least one, with at least one of the independent shutdown paths (2, 3) coupled, a dependent, in particular third Abschaltweg controlling safety device (4) in order to ensure a reliable interruption of the fuel supply in the presence of a fault in the at least one independent Abschaltweg (2, 3).
dadurch gekennzeichnet, dass der abhängige Abschaltweg (5) über ein dynamisches Signal mit mindestens einem der unabhängigen Abschaltwege (2, 3) gekoppelt, insbesondere getriggert, ist.Device (1) according to claim 5,
characterized in that the dependent Abschaltweg (5) via a dynamic signal with at least one of the independent Abschaltwege (2, 3) coupled, in particular triggered, is.
dadurch gekennzeichnet, dass der dritte Abschaltweg (5) einen Schalter (19) zum Unterbrechen der Spannungs- und/oder Stromversorgung der Ventile umfasst, wobei der Schalter (19) in Abhängigkeit eines Triggersignales schaltbar ist.Device (1) according to claim 5 or 6,
characterized in that the third Abschaltweg (5) comprises a switch (19) for interrupting the voltage and / or power supply of the valves, wherein the switch (19) is switchable in response to a trigger signal.
dadurch gekennzeichnet, dass der abhängige Abschaltweg (5) mindestens einen System-Basis-Chip (6), insbesondere einen Watchdog-IC oder Wachhund-IC, zum Überwachen des gekoppelten unabhängigen Abschaltweges (2, 3) umfasst.Device (1) according to one of claims 5 to 7,
characterized in that the dependent Abschaltweg (5) comprises at least one system base chip (6), in particular a watchdog IC or guard dog IC, for monitoring the coupled independent Abschaltweges (2, 3).
dadurch gekennzeichnet, dass die Sicherheitseinrichtung (4) mindestens für mindestens zwei unabhängige Abschaltwege (2,3) je einen Stromausfallschutz (7), insbesondere einen Überspannungsschutz, aufweist.Device (1) according to one of claims 5 to 8,
characterized in that the safety device (4) at least for at least two independent shutdown paths (2,3) each have a power failure protection (7), in particular an overvoltage protection has.
dadurch gekennzeichnet, dass die Schaltmittel mindestens eine Vorrichtung (1) nach einem der Ansprüche 5 bis 9 umfassen.Automatic gas burner control for safe operation of a combustion system, with switching means,
characterized in that the switching means comprise at least one device (1) according to one of claims 5 to 9.
dadurch gekennzeichnet, dass mindestens ein Gasfeuerungsautomat nach Anspruch 10 vorgesehen ist.Combustion system
characterized in that at least one automatic gas burner is provided according to claim 10.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102009036423.4A DE102009036423C5 (en) | 2009-08-06 | 2009-08-06 | Method and device for interrupting a fuel supply and use thereof |
Publications (3)
Publication Number | Publication Date |
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EP2295863A2 true EP2295863A2 (en) | 2011-03-16 |
EP2295863A3 EP2295863A3 (en) | 2014-06-11 |
EP2295863B1 EP2295863B1 (en) | 2019-05-01 |
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Family Applications (1)
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EP10172195.9A Active EP2295863B1 (en) | 2009-08-06 | 2010-08-06 | Combustion system, automatic gas ignition device and device and method for interrupting a fuel supply for same |
Country Status (2)
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EP (1) | EP2295863B1 (en) |
DE (1) | DE102009036423C5 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3848633A1 (en) | 2020-01-10 | 2021-07-14 | Siemens Aktiengesellschaft | Circuit with protection against internal faults |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE102020104766A1 (en) | 2020-02-24 | 2021-08-26 | Vaillant Gmbh | Method and device for fault diagnosis on a burner control |
DE102020128045A1 (en) | 2020-10-26 | 2022-04-28 | Vaillant Gmbh | Method and apparatus for preventing flashback in a premixed fuel-air combustor assembly |
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DE19860399A1 (en) | 1998-12-28 | 2000-07-06 | Bosch Gmbh Robert | Control device for a burner |
JP3419752B2 (en) | 2000-10-19 | 2003-06-23 | アール・ビー・コントロールズ株式会社 | Combustion control device |
JP2004093047A (en) | 2002-09-02 | 2004-03-25 | Rb Controls Co | Combustion control device |
DE10321764B4 (en) | 2003-05-15 | 2005-04-28 | Bbt Thermotechnik Gmbh | Method for controlling a safety relay in an automatic burner control |
US20050244765A1 (en) | 2004-03-05 | 2005-11-03 | Honda Motor Co., Ltd. | Method of controlling operation of fuel gas production apparatus |
DE102004017950B3 (en) | 2004-04-14 | 2005-06-23 | Moeller Gmbh | Mechanical-electronic position indicator has microcontroller that detects potentiometer slider voltage, has digital output connected via converter to output stage, outputs watchdog signals to monitoring stages controlling supply voltage |
-
2009
- 2009-08-06 DE DE102009036423.4A patent/DE102009036423C5/en active Active
-
2010
- 2010-08-06 EP EP10172195.9A patent/EP2295863B1/en active Active
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3848633A1 (en) | 2020-01-10 | 2021-07-14 | Siemens Aktiengesellschaft | Circuit with protection against internal faults |
US11789799B2 (en) | 2020-01-10 | 2023-10-17 | Siemens Aktiengesellschaft | Protection against internal faults in burners |
Also Published As
Publication number | Publication date |
---|---|
DE102009036423C5 (en) | 2023-03-02 |
EP2295863A3 (en) | 2014-06-11 |
EP2295863B1 (en) | 2019-05-01 |
DE102009036423A1 (en) | 2011-02-17 |
DE102009036423B4 (en) | 2013-03-28 |
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