EP3859210B1 - Procédé d'optimisation d'une plage de tolérance d'une courbe caractéristique d'une régulation de mélange électronique dans un appareil de chauffage à gaz - Google Patents

Procédé d'optimisation d'une plage de tolérance d'une courbe caractéristique d'une régulation de mélange électronique dans un appareil de chauffage à gaz Download PDF

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Publication number
EP3859210B1
EP3859210B1 EP21153150.4A EP21153150A EP3859210B1 EP 3859210 B1 EP3859210 B1 EP 3859210B1 EP 21153150 A EP21153150 A EP 21153150A EP 3859210 B1 EP3859210 B1 EP 3859210B1
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EP
European Patent Office
Prior art keywords
gas
fuel gas
tolerance range
control
mixture
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EP21153150.4A
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German (de)
English (en)
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EP3859210A1 (fr
Inventor
Hartmut Henrich
Stephan Wald
Jens Hermann
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Ebm Papst Landshut GmbH
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Ebm Papst Landshut GmbH
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Publication of EP3859210A1 publication Critical patent/EP3859210A1/fr
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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

Definitions

  • the invention relates to a method for optimizing a tolerance range of a control characteristic of an electronic mixture control using an ionization current control in a gas heater.
  • control characteristics in the map differ significantly for different types of gas, eg liquid gas or natural gas.
  • a tolerance range around the control characteristics, which is used for different types of gas, must be designed to be correspondingly wide around all control characteristics.
  • compliant results are then delivered even though there is a clear deviation from the actual control characteristic, since a different type of gas is used, for example.
  • a generic method is in EP 0 806 610 A2 disclosed.
  • the invention is therefore based on the object of providing a method with which a tolerance range around the control characteristic can be defined more narrowly and thus the safety of the gas heater can be increased. This object is achieved by the combination of features according to claim 1.
  • a method for optimizing a tolerance range of a control characteristic of an electronic mixture control of gas and a specific combustible gas using an ionization current control in a gas heater with a burner and a blower suggested.
  • a gas quantity of the gas supplied to the burner via the blower and a combustion gas quantity are regulated by an electronically controlled combustion gas actuator via a control device.
  • the method comprises the steps of a short-term, ie time-limited, increase in the fuel gas quantity to enrich a fuel gas/gas mixture fed to the burner during any operating point of the heater until an ionization signal detected at a burner flame of the burner has a maximum.
  • the air ratio of the combustible gas/gas mixture is equal to 1.0 (lambda value).
  • an ionization signal target value for the specific fuel gas for example liquid gas or natural gas, is then calculated. This lambda value is often set with an excess of gas (excess of air), in particular at 1.3.
  • the fuel gas/gas mixture is then adjusted until the calculated ionization signal target value is reached via the actuator(s) (fuel gas actuator, blower).
  • the ionization signal target value is reached, the fan speed of the fan is assigned to the position of the fuel gas actuator and the control characteristic is determined in a characteristic map formed from the fan speed and the position of the fuel gas actuator. The desired tolerance range is defined around the determined control characteristic for the specific fuel gas.
  • Operation outside the tolerance range can trigger a switch-off signal, which leads to the gas heater being switched off.
  • the calibration can be carried out again, i.e. the process steps beginning with the enrichment are carried out again and a new control characteristic is defined again.
  • the tolerance range also serves as a plausibility check between the control of the blower and the fuel gas actuator and the actually recorded ionization signals for checking the combustion. Any sensors used, for example a fuel gas quantity sensor, a gas quantity sensor and/or a gas mixture sensor, can also be checked for plausibility with regard to their measured sensor values.
  • the method provides as an embodiment variant that the fuel gas/gas mixture is adjusted until the ionization signal setpoint is reached, preferably by adjusting the fuel gas quantity via the fuel gas actuator or alternatively by adjusting the gas quantity via the blower. In this case, either the fuel gas actuator and thus its open position is varied or the fan speed is changed.
  • figure 1 shows the schematic structure of a gas heater 200 for carrying out the method.
  • air is always assumed to be the gas, even if other gases can theoretically also be used.
  • Fan 5 designed as a premix fan and in particular the fan speed for supplying a controllable quantity of air b and the fuel gas actuator or gas valve 2 driven by a stepper motor M for supplying a controllable quantity of fuel c are regulated via control unit 9 in order to regulate the fuel gas-air mixture e to generate a specific fuel gas-air mixture ratio.
  • figure 2 shows a diagram 30 of an opening position 32 of the fuel gas actuator 2 in relation to the fan speed 31 with control characteristics 36, 37 for the gas types liquid gas and natural gas and a tolerance range 38, 39 at high fan speeds 34 and low fan speeds 35 according to the prior art.
  • the tolerance range is marked by the dot-dash lines and covers both gas types. The area enclosed by the tolerance range is therefore comparatively large and the associated security for the plausibility check is low.
  • the fuel gas quantity is increased using the ionization electrode 7 of the ionization current control to enrich the fuel gas-air mixture e supplied to the burner 28 during an operating point of the gas heater 200 until the ionization signal Io signal has a maximum Io-max , like it in figure 3 is shown.
  • the ionization signal setpoint value lo-soll is calculated for the specific combustible gas.
  • the lambda value calculated as an example is 1.3.
  • the ionization signal is thereby changed from the previous signal value Io-old to the calculated signal value Io-new and the combustible gas/air mixture is adjusted until the ionization signal setpoint value lo-setpoint is reached.
  • the value of 1.3 is preferred, although exemplary.
  • the fan speed 43 of the fan 5 is assigned to a position 48 of the combustion gas actuator 4 . From this, the control characteristic 49 is determined in the characteristics map of diagram 40 and the tolerance range 46, 47 around the determined control characteristic 49 for the determined combustible gas is established.
  • the total tolerance range of the dashed line is significantly lower than that to be provided for a process with an undetermined gas type, as described in figure 2 is shown.
  • the dot-dash line off figure 2 is also in for illustration figure 4 registered.
  • the width of the tolerance range around the control characteristic 49 is defined as required. This type of calibration of the control characteristic and definition of the tolerance range takes place dynamically and in particular when the tolerance range is left to define a new control characteristic.

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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)

Claims (5)

  1. Procédé d'optimisation d'une plage de tolérance d'une courbe caractéristique de régulation d'un correcteur de mélange électronique d'un gaz et d'un gaz combustible déterminé en utilisant une régulation de courant d'ionisation sur un appareil de chauffage à gaz (200) comprenant un brûleur (28) et une soufflante (5), dans lequel une quantité de gaz du gaz, amenée au brûleur (28) par l'intermédiaire de la soufflante (5), et une quantité de gaz combustible sont régulées par un actionneur de gaz combustible à commande électronique (2) par l'intermédiaire d'un appareil de commande (9), comprenant les étapes consistant à :
    - augmenter de manière limitée dans le temps la quantité de gaz combustible pour enrichir un mélange gaz combustible/gaz amené au brûleur (28) pendant un point de fonctionnement de l'appareil de chauffage à gaz (200) jusqu'à ce qu'un signal d'ionisation (lo-Signal) détecté au niveau d'une flamme de brûleur du brûleur (28) présente un maximum (Io-max),
    - calculer une valeur de consigne de signal d'ionisation (Io-Soll) pour le gaz combustible déterminé,
    - adapter le mélange de gaz combustible/gaz jusqu'à ce que la valeur de consigne de signal d'ionisation (Io-Soll) soit atteinte,
    - attribuer une vitesse de rotation de soufflante de la soufflante à une position de l'actionneur de gaz combustible lorsque la valeur de consigne de signal d'ionisation (Io-Soll) est atteinte,
    caractérisé par les étapes consistant à :
    - établir la courbe caractéristique de régulation sur un diagramme caractéristique formé à partir de la vitesse de rotation de soufflante et de la position de l'actionneur de gaz combustible,
    - fixer la plage de tolérance autour de la courbe caractéristique de régulation établie pour le gaz combustible déterminé.
  2. Procédé selon la revendication 1, dans lequel l'optimisation de la plage de tolérance est effectuée de manière dynamique directement en fonction du gaz combustible déterminé en cours de fonctionnement de l'appareil de chauffage à gaz (200).
  3. Procédé selon la revendication 1 ou 2, dans lequel l'adaptation du mélange gaz combustible/gaz est effectuée jusqu'à ce que la valeur de consigne de signal d'ionisation (Io-Soll) soit atteinte par une adaptation de la quantité de gaz combustible par l'intermédiaire de l'actionneur de gaz combustible ou par une adaptation de la quantité de gaz par l'intermédiaire de la soufflante (5).
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel le mélange gaz combustible/gaz est un mélange gaz combustible/air (e).
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel la plage de tolérance est placée autour de la position de l'actionneur de gaz combustible ou autour de la vitesse de rotation de soufflante.
EP21153150.4A 2020-01-29 2021-01-25 Procédé d'optimisation d'une plage de tolérance d'une courbe caractéristique d'une régulation de mélange électronique dans un appareil de chauffage à gaz Active EP3859210B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020102117.8A DE102020102117A1 (de) 2020-01-29 2020-01-29 Verfahren zur Optimierung eines Toleranzbereichs einer Regelungskennlinie einer elektronischen Gemischregelung bei einem Gasheizgerät

Publications (2)

Publication Number Publication Date
EP3859210A1 EP3859210A1 (fr) 2021-08-04
EP3859210B1 true EP3859210B1 (fr) 2022-06-29

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EP21153150.4A Active EP3859210B1 (fr) 2020-01-29 2021-01-25 Procédé d'optimisation d'une plage de tolérance d'une courbe caractéristique d'une régulation de mélange électronique dans un appareil de chauffage à gaz

Country Status (2)

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EP (1) EP3859210B1 (fr)
DE (1) DE102020102117A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2158400T3 (es) * 1996-05-09 2001-09-01 Stiebel Eltron Gmbh & Co Kg Procedimiento para el funcionamiento de un quemador de gas.
DE19831648B4 (de) 1998-07-15 2004-12-23 Stiebel Eltron Gmbh & Co. Kg Verfahren zur funktionalen Adaption einer Regelelektronik an ein Gasheizgerät
DE102010046954B4 (de) * 2010-09-29 2012-04-12 Robert Bosch Gmbh Verfahren zur Kalibrierung, Validierung und Justierung einer Lambdasonde
DE102010055567B4 (de) * 2010-12-21 2012-08-02 Robert Bosch Gmbh Verfahren zur Stabilisierung eines Betriebsverhaltens eines Gasgebläsebrenners
DE102017126137A1 (de) 2017-11-08 2019-05-09 Ebm-Papst Landshut Gmbh Verfahren zur Regelung eines brenngasbetriebenen Heizgerätes

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DE102020102117A1 (de) 2021-07-29
EP3859210A1 (fr) 2021-08-04

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