EP3859210A1 - 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
EP3859210A1
EP3859210A1 EP21153150.4A EP21153150A EP3859210A1 EP 3859210 A1 EP3859210 A1 EP 3859210A1 EP 21153150 A EP21153150 A EP 21153150A EP 3859210 A1 EP3859210 A1 EP 3859210A1
Authority
EP
European Patent Office
Prior art keywords
gas
fuel gas
control
tolerance range
fan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21153150.4A
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German (de)
English (en)
Other versions
EP3859210B1 (fr
Inventor
Hartmut Henrich
Stephan Wald
Jens Hermann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst Landshut GmbH
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Ebm Papst Landshut GmbH
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Publication date
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Publication of EP3859210A1 publication Critical patent/EP3859210A1/fr
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Publication of EP3859210B1 publication Critical patent/EP3859210B1/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, e.g. LPG or natural gas.
  • a tolerance range around the control characteristics, which is used for different types of gas, must be designed accordingly broadly around all control characteristics. In the case of a plausibility check of sensor values, compliant results are then delivered, although there is a significant deviation from the actual control characteristic, e.g. because a different type of gas is used.
  • the invention is therefore based on the object of providing a method with which a tolerance range around the control characteristic can be narrowed and thus the safety of the gas heater can be increased.
  • a method for optimizing a tolerance range of a control characteristic of an electronic mixture control of gas and a specific fuel gas using an ionization current control in a gas heater with a burner and a fan is provided suggested.
  • a gas quantity of the gas supplied to the burner is regulated by the fan and a quantity of fuel gas is regulated by an electronically controlled fuel gas actuator through a control unit.
  • the method comprises the steps of a short-term, ie time-limited increase in the amount of fuel gas to enrich a fuel gas-gas mixture supplied 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 fuel gas / gas mixture is equal to 1.0 (lambda value).
  • An ionization signal setpoint value for the specific fuel gas for example liquid gas or natural gas, is then calculated from the maximum of the ionization signal. This lambda value is often fixed with an excess of gas (excess air), in particular at 1.3. Thereafter, the adjustment of the fuel gas / gas mixture takes place until the calculated ionization signal setpoint value is reached via the actuator or actuators (fuel gas actuator, fan).
  • the fan speed of the fan is assigned to the position of the fuel gas control element and the control characteristic is determined in a map formed from the fan speed and the position of the fuel gas control element. The desired tolerance range is defined around the determined control characteristic for the specific fuel gas.
  • the tolerance range can be set around a single, clearly defined control characteristic and can therefore be made significantly smaller.
  • the tolerance range is at least 50% narrower in the range of the maximum fan speed compared to a tolerance range that takes at least two types of gas into account.
  • 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 enrichment are carried out again and a new control characteristic is established.
  • the tolerance range also serves as a plausibility check between the control of the fan and the fuel gas actuator and the actually recorded ionization signals to check 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 optimization of the tolerance range takes place dynamically and directly as a function of the determined gas type while the gas heater is in operation.
  • “Dynamic” is defined as the possibility of not regulating with a fixed control characteristic, but reacting to new situations through the adjustment of the control characteristic and defining a tolerance range that is optimized for this.
  • the adjustment of the fuel gas-air mixture until the ionization signal setpoint is reached is preferably carried out by adjusting the fuel gas quantity via the fuel gas actuator or, alternatively, adjusting the gas quantity via the fan. Either the fuel gas control element and thus its open position are varied or the fan speed is changed.
  • the fuel gas / gas mixture is preferably a fuel gas / air mixture.
  • Figure 1 the schematic structure of a gas heater 200 for performing the method is shown.
  • air is always assumed to be the gas, even if other gases can theoretically also be used.
  • the control unit 9 is used to regulate the blower 5, designed as a premix blower, and in particular the blower speed for supplying a controllable amount of air b and the fuel gas actuator or gas valve 2, which is driven by a stepper motor M, for supplying a controllable amount of fuel gas c in order to generate the fuel gas-air mixture e to generate in a certain fuel gas / air mixture ratio.
  • the fuel gas is fed to the blower 5 via a gas nozzle 4 in the gas line, a gas safety valve 1 being arranged upstream of the fuel gas actuator 2 in the gas line.
  • the gas inlet pressure d is adapted to the gas control pressure.
  • an optional non-return flap 6 is provided at the blower outlet.
  • the burner 28 with an ionization electrode 7 arranged in the burner flame, with which a flame is detected on the burner 28 and a corresponding ionization signal is transmitted to the control device 9.
  • a heat exchanger is arranged around the burner 28.
  • control unit 9 The control of the amount of fuel gas flowing through the gas actuator 2 as well as the fan speed and consequently the air ratio takes place via the control unit 9, in which the corresponding control characteristics are stored and can be saved.
  • the corresponding signal lines to and from the control unit 9 are marked with arrows.
  • Figure 2 shows a diagram 30 of an open position 32 of the fuel gas actuator 2 compared 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 indicated by the dotted lines and extends both types of gas. The area enclosed by the tolerance range is therefore comparatively large and the associated security for plausibility checking is low.
  • the amount of fuel gas for enriching the fuel gas-air mixture e fed to the burner 28 is increased using the ionization electrode 7 of the ionization flow control during an operating point of the gas heater 200 until the ionization signal Io signal has a maximum Io-max as it is in Figure 3 is shown.
  • the ionization signal setpoint value lo-soll is calculated for the specific fuel gas.
  • the lambda value calculated as an example is 1.3.
  • the ionization signal is thereby changed from the previous signal value lo-old to the calculated signal value Io-new and the fuel gas-air mixture is adapted until the ionization signal setpoint value lo-target is reached.
  • the value of 1.3 is preferred, however exemplary.
  • the fan speed 43 of the fan 5 is assigned to a position 48 of the fuel gas control element 4.
  • the control characteristic curve 49 is determined in the characteristics map of diagram 40 and the tolerance range 46, 47 around the control characteristic line 49 determined for the determined fuel gas is established.
  • the reduction, ie optimization of the tolerance range 46, particularly at high fan speeds 44, can be clearly seen, but also in the range of lower speeds 45 the tolerance range 47 is smaller than the tolerance range 39 according to FIG Figure 2 .
  • the entire tolerance range of the dashed line is significantly smaller than that which is to be provided for a method with an indefinite type of gas, as shown in FIG Figure 2 is shown.
  • the dotted line Figure 2 is also in Figure 4 registered.
  • the width of the tolerance range around the control characteristic curve 49 is determined as required. This type of calibration of the control characteristic and definition of the tolerance range takes place dynamically and in particular when leaving the tolerance range 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)
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 true EP3859210A1 (fr) 2021-08-04
EP3859210B1 EP3859210B1 (fr) 2022-06-29

Family

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Application Number Title Priority Date Filing Date
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)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0806610A2 (fr) * 1996-05-09 1997-11-12 STIEBEL ELTRON GmbH & Co. KG Procédé et dispositif pour le fonctionnement d'un brûleur à gaz
DE102010046954A1 (de) * 2010-09-29 2012-03-29 Robert Bosch Gmbh Verfahren zur Kalibrierung, Validierung und Justierung einer Lambdasonde
DE102010055567A1 (de) * 2010-12-21 2012-06-21 Robert Bosch Gmbh Verfahren zur Stabilisierung eines Betriebsverhaltens eines Gasgebläsebrenners

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831648B4 (de) 1998-07-15 2004-12-23 Stiebel Eltron Gmbh & Co. Kg Verfahren zur funktionalen Adaption einer Regelelektronik an ein Gasheizgerät
DE102017126137A1 (de) 2017-11-08 2019-05-09 Ebm-Papst Landshut Gmbh Verfahren zur Regelung eines brenngasbetriebenen Heizgerätes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0806610A2 (fr) * 1996-05-09 1997-11-12 STIEBEL ELTRON GmbH & Co. KG Procédé et dispositif pour le fonctionnement d'un brûleur à gaz
DE102010046954A1 (de) * 2010-09-29 2012-03-29 Robert Bosch Gmbh Verfahren zur Kalibrierung, Validierung und Justierung einer Lambdasonde
DE102010055567A1 (de) * 2010-12-21 2012-06-21 Robert Bosch Gmbh Verfahren zur Stabilisierung eines Betriebsverhaltens eines Gasgebläsebrenners

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DE102020102117A1 (de) 2021-07-29
EP3859210B1 (fr) 2022-06-29

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