EP4060235A1 - Procédé de fonctionnement d'un appareil de chauffage pourvu d'ensemble électronique gaz-air - Google Patents

Procédé de fonctionnement d'un appareil de chauffage pourvu d'ensemble électronique gaz-air Download PDF

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Publication number
EP4060235A1
EP4060235A1 EP22157386.8A EP22157386A EP4060235A1 EP 4060235 A1 EP4060235 A1 EP 4060235A1 EP 22157386 A EP22157386 A EP 22157386A EP 4060235 A1 EP4060235 A1 EP 4060235A1
Authority
EP
European Patent Office
Prior art keywords
gas
stepping motor
heater
motor valve
ignition
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.)
Pending
Application number
EP22157386.8A
Other languages
German (de)
English (en)
Inventor
Graf Alexander
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.)
Vaillant GmbH
Original Assignee
Vaillant GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vaillant GmbH filed Critical Vaillant GmbH
Publication of EP4060235A1 publication Critical patent/EP4060235A1/fr
Pending legal-status Critical Current

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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
    • F23N5/02—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
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel 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
    • F23N5/126—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 electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/12—Flame sensors with flame rectification current detecting means
    • 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
    • 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
    • F23N2235/24—Valve details

Definitions

  • the invention relates to a method for operating a heater with an electronic gas-air compound, a computer program, a control device, a heater and a use of a heater.
  • Conventional gas burners usually control the gas/air ratio via a pneumatic gas/air ratio controller. By changing the fan speed, the amount of gas and thus also the output are changed at the same time. With an electronic gas-air combination, on the other hand, the pneumatic coupling of gas and air is eliminated.
  • the power requested by the modulation controller of the heater is transferred in the burner control unit into a speed signal for the fan and at the same time into a command for the stepper motor on the gas valve. Since there is no reference for the actual air volume flow with this method, the exhaust gas quality must be monitored.
  • Electronic gas-air compound means that gas and air are supplied separately from each other. That is, the amount of gas follows the amount of air via a stepper motor gas valve.
  • the combustion is monitored by an ionization electrode. By measuring the electrical conductivity of the flame, it is possible to assess the quality of the combustion. This is used to control the gas supply, mostly by means of an actuator designed as a gas stepping motor.
  • One advantage over pneumatic gas-air systems is the ability to adapt to fluctuations in the gas composition.
  • a gas stepping motor valve is moved via a ramp control and an ignition device is actuated at the same time.
  • the ionization current is measured as a signal from the flame via the ionization electrode. If there is no flame signal after a defined ignition safety time has elapsed, the ignition process is aborted.
  • the EP 3 301 365 A1 discloses a method for controlling an ignition operation of a heating system, it being possible to take into account an operating parameter detected before the ignition operation.
  • the operating parameter is suitable for determining a quality of a fuel used in the heating system, or its calorific value, or a type of fuel and/or a power requirement for the heating system.
  • a fluid supply parameter can be increased until an ignition value of the same is reached and a flame ignites in the heating system.
  • the method is carried out as part of the commissioning or ignition process of a heating device and the problem of possible ignition in the border area with the associated potential for damage to the heating device therefore remains.
  • the method also does not take into account possible component tolerances and/or the state of wear of connected components, such as the gas stepper motor in particular.
  • the method should be able to be carried out as far as possible without additional components, so that the robustness of a proposed heating device is not reduced in comparison to the prior art.
  • Steps a) - c) are carried out at least once at the same time.
  • the method can also be carried out with a heating device that is also described here.
  • a control unit of a heating device is preferably set up to carry out the proposed method.
  • an opening position of a gas stepping motor valve is moved via an ignition ramp function.
  • the gas stepping motor valve controls the gas supply via the opening position and thus the composition of the gas mixture (gas-air combination) to be supplied to the heat generator.
  • the ignition ramp function is preferably a linear function and maps the opening position of the gas stepping motor valve for a defined period of time, in particular the ignition safety time.
  • step b) is carried out, a detection of the ionization current during the movement of the opening position of the gas stepping motor valve.
  • step c) the detected ionization current is compared with a defined limit value.
  • the opening position of the gas stepping motor valve is recorded.
  • the heater can now return to normal heating operation. It is pointed out that the ignition safety time plays no role in the implementation of the method proposed here, but that the opening position of the gas stepping motor valve is moved according to the ignition ramp function until the defined limit value is reached.
  • the ignition ramp function is adapted.
  • the ignition ramp function can be characterized by a minimum opening position of the gas stepping motor valve, which causes a lean combustion mixture, for example with a lambda value of approx. 1.6, and a maximum opening position of the gas stepping motor valve, which causes a higher proportion of fuel in the combustion mixture, for example a lambda value of approx. 1 ,1.
  • the gas stepping motor valve is often in the minimum opening position at the start of a defined period of time and in the maximum opening position at the end of a defined period of time, the ignition safety time.
  • the maximum opening position of the adapted ignition ramp function can be proportional to or preferably equal to the opening position of the gas stepping motor valve detected in step c) when the defined limit value is reached.
  • the minimum opening position of the ignition ramp function can be changed by the same amount in the opposite direction as the maximum opening position is adjusted. So if the maximum opening position of the adjusted ignition ramp function is lowered by ⁇ x, the minimum opening position of the adjusted ignition ramp function can be increased by the same value ⁇ x.
  • the opening position in the middle of the defined time period is the same for original and adapted ignition ramp functions in this embodiment.
  • the defined limit value in step c) can be a value determined in advance, which ensures reliable ignition without deflagration.
  • the method proposed here is repeated regularly. It is seen as an advantage that the ignition ramp function can be continuously adapted to changing boundary conditions, for example wear of the gas stepping motor valve and/or a change in the composition of the fuel.
  • steps a) - c) are repeated several times and an average value of the opening position of the detected in step c).
  • the ignition ramp function according to step d) can then be adjusted using the mean value of the detected opening positions.
  • a computer program is also proposed which is set up to (at least partially) carry out a method presented here.
  • this relates in particular to a computer program (product), comprising instructions which, when the program is executed by a computer, cause the latter to execute a method described here.
  • a machine-readable storage medium is also proposed, on which the computer program is stored.
  • the machine-readable storage medium can be a computer-readable data carrier.
  • a control unit for a heater is also proposed, set up to carry out a method presented here.
  • the control unit can have a processor, for example, or have it at its disposal.
  • the processor can, for example, execute the method stored in a memory (of the control unit). At least the ignition ramp function and/or the defined limit value are preferably stored in the same memory.
  • a heater with a control unit presented here is also proposed.
  • the heating device is in particular a gas heating device with a gas burner and a gas delivery device which can deliver a mixture of gas and combustion air (electronic gas-air combination) to a gas burner.
  • a method for operating a heater with an electronic gas-air compound, a computer program, a control device and a heater for carrying out the method and a use of a heater are thus specified here, which at least partially solve the problems described with reference to the prior art.
  • the method, the computer program, the control device and the heater as well as the use each at least contribute to ensuring a reliable ignition process of the heater.
  • the proposed method is technically easy to implement, since no additional technical means are required.
  • an ignition ramp function is adapted during heating operation, so that a permanent (continuous or intermittent) adaptation of the ignition ramp function to changes in the gas mixture (or its calorific value) and possible changes in components involved in mixture formation, in particular the gas stepping motor valve , can be done.
  • the ignition ramp function can be limited to a predefined limit value of the ionization current of the flame, with the predefined limit value of the ionization current being able to characterize a borderline combustion air ratio (lambda value) that should not be fallen below during an ignition process in order to avoid critical ignition processes.
  • FIG. 1 shows an exemplary and schematic sequence of a method proposed here.
  • the method allows an ignition ramp function of a heater that is in heating mode to be adapted.
  • the method steps a) to d) are represented as blocks 110, 120, 130 and 140.
  • step a an opening position of a gas stepping motor valve is moved via an original ignition ramp function Z 0 (t).
  • the ionization current I ion is detected in block 120 according to step b).
  • the opening position of the gas stepping motor valve is detected when a predefined limit value of the ionization current I ion is reached.
  • step d) the ignition ramp function Z(t) is adjusted, taking into account the opening position of the gas stepping motor valve detected in block 130 when a predefined limit value of the ionization current I ion is reached and an adjusted ignition ramp function Z is defined
  • the fan speed n G is an example of an operating parameter of a gas delivery device of the heater.
  • points Pmin and Pmax can be defined.
  • the defined limit value of the ionization current can be determined.
  • FIG. 3 shows a diagram in which the opening position of the gas stepping motor valve during an ignition process is shown as a function of time t.
  • a point in time tz defines the end of the ignition process, the ignition safety time.
  • the Z 0 (t) function represented an original ignition ramp function that had not yet been adjusted for gas stepping motor valve tolerances and environmental variables.
  • Point Z D represents the opening position of the gas stepping motor valve detected in block 130 when a predefined limit value of the ionization current is reached at time tz.
  • the original ignition ramp function Z 0 (t) can now be adapted by an adapted ignition ramp function Z A (t) assuming the value Z D at time tz.
  • the change value ⁇ x is defined by the difference between the original ignition ramp function Z 0 (t) at time tz and the opening position of the gas stepping motor valve detected in block 130 when the predefined limit value Z D of the ionization current I ion is reached.
  • FIG. 4 shows an example of a heater 1 proposed here, having a heat generator 11.
  • a gas delivery device 21 is arranged, which is embodied here as a blower.
  • the speed of the blower is a measure of the heat output of the heater 1.
  • a gas stepping motor valve 31 is arranged.
  • An ionization electrode 41 is positioned in the heat generator 11 in the area of a flame 4, by means of which an ionization current I ion of the flame 4 can be measured.
  • An ignition device 42 is also arranged in the area of the flame 4 and is set up to ignite the flame 4 during an ignition process.
  • a control unit 5 is electrically connected to at least the ionization electrode 41, the gas stepping motor valve 31 and the blower. Control unit 5 is set up to carry out a method proposed here.
  • At least one ignition ramp function Z 0 (t) and a defined limit value of the ionization current I ion are stored in a memory in control unit 5 .
  • the method allows an ignition ramp function of a heater to be adapted to the tolerances of the gas stepping motor valve and environmental variables, thereby ensuring increased functional reliability when the heater is ignited.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Regulation And Control Of Combustion (AREA)
EP22157386.8A 2021-02-23 2022-02-18 Procédé de fonctionnement d'un appareil de chauffage pourvu d'ensemble électronique gaz-air Pending EP4060235A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021104191.0A DE102021104191A1 (de) 2021-02-23 2021-02-23 Verfahren zum Betreiben eines Heizgerätes mit elektronischem Gas-Luftverbund

Publications (1)

Publication Number Publication Date
EP4060235A1 true EP4060235A1 (fr) 2022-09-21

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Application Number Title Priority Date Filing Date
EP22157386.8A Pending EP4060235A1 (fr) 2021-02-23 2022-02-18 Procédé de fonctionnement d'un appareil de chauffage pourvu d'ensemble électronique gaz-air

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EP (1) EP4060235A1 (fr)
DE (1) DE102021104191A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022130039A1 (de) 2022-11-14 2024-05-16 Vaillant Gmbh Verfahren zur Inbetriebnahme eines Heizgerätes, Regel- und Steuergerät, Heizgerät und Computerprogramm

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3228936A1 (fr) * 2016-04-07 2017-10-11 Honeywell Technologies Sarl Procédé de fonctionnement d'un appareil à brûleur à gaz
DE202018101271U1 (de) * 2018-03-07 2018-03-15 Ebm-Papst Landshut Gmbh Brenngasbetriebenes Heizgerät
EP3301365A1 (fr) 2016-09-02 2018-04-04 Robert Bosch GmbH Procédé de commande d'un allumage d'un système de chauffage etunité de commande et système de chauffage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3228936A1 (fr) * 2016-04-07 2017-10-11 Honeywell Technologies Sarl Procédé de fonctionnement d'un appareil à brûleur à gaz
EP3301365A1 (fr) 2016-09-02 2018-04-04 Robert Bosch GmbH Procédé de commande d'un allumage d'un système de chauffage etunité de commande et système de chauffage
DE202018101271U1 (de) * 2018-03-07 2018-03-15 Ebm-Papst Landshut Gmbh Brenngasbetriebenes Heizgerät

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