EP3290800B1 - Procédé d'actualisation d'une caractéristique dans un système de chauffage ainsi que unité de commande et système de chauffage - Google Patents

Procédé d'actualisation d'une caractéristique dans un système de chauffage ainsi que unité de commande et système de chauffage Download PDF

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Publication number
EP3290800B1
EP3290800B1 EP17187654.3A EP17187654A EP3290800B1 EP 3290800 B1 EP3290800 B1 EP 3290800B1 EP 17187654 A EP17187654 A EP 17187654A EP 3290800 B1 EP3290800 B1 EP 3290800B1
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EP
European Patent Office
Prior art keywords
characteristic curve
heating system
parameter
updating
characteristic
Prior art date
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EP17187654.3A
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German (de)
English (en)
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EP3290800A1 (fr
Inventor
Ab Snijder
Jan Koudijs
Danny Leerkes
Jan Westra
Maarten Van Bentem
Bram JASPERS
Sjoerd Reijke
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority claimed from DE102017204021.1A external-priority patent/DE102017204021A1/de
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Publication of EP3290800A1 publication Critical patent/EP3290800A1/fr
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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
    • 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
    • F23N2227/00—Ignition or checking
    • F23N2227/18—Applying test signals, e.g. periodic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/20—Calibrating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed

Definitions

  • the invention relates to a method for updating a characteristic curve in a heating system.
  • the invention also relates to a control unit which is designed to carry out the method according to the invention and to a heating system with the control unit according to the invention.
  • the EP 2 466 204 A1 shows a method for updating a setpoint characteristic curve S1 for an ionization current.
  • a test point B is first determined by shifting it by a fixed, predetermined ⁇ .
  • the new setpoint characteristic curve S2 is derived from test point B.
  • the DE 10 2011 111 453 A1 shows and describes a method in which an assignment function for setting an air ratio in a heating device is updated.
  • the assignment function is a table of values which assigns a control signal for adjusting a fuel metering device to an amount of combustion air.
  • the assignment function is updated in control phases in that all value pairs of the assignment function are shifted or scaled with a factor if a recorded, current value pair deviates too much from a value pair from the assignment function.
  • the method has the disadvantage that the assignment function corrected in this way continues to have the same functional features or characteristics.
  • the course of the corrected allocation function corresponds to the course of the incorrect allocation function, the corrected allocation function is only shifted or scaled by the factor. If the actually required assignment function changes significantly from the characteristics of its course, for example due to a change in a slope or curvature, so that the required one Assignment function cannot be determined by shifting by or scaling with a factor, for example due to a sudden change in the external conditions, it is not possible with the method to update the assignment function as necessary. The heater can then no longer be operated optimally to the desired extent.
  • the invention provides a method for updating a characteristic curve in a heating system.
  • the fact that at least two update points are recorded along the characteristic curve and the characteristic curve is redetermined as a function of the at least two update points results in the advantage that the course of the characteristic curve can be completely re-adjusted.
  • the characteristic curve can also be adapted, in particular, to major changes in internal and / or external conditions.
  • the heating system can be operated reliably and largely optimally to the intended extent.
  • Heating system is to be understood as meaning at least one device for generating thermal energy, in particular a heating device or heating burner, in particular for use in heating a building and / or for generating hot water, preferably by burning a gaseous or liquid fuel.
  • a heating system can also consist of several such devices for generating thermal energy and other devices that support the heating operation, such as hot water and fuel storage tanks.
  • a “characteristic curve” should be understood to mean a data field which is suitable for controlling and / or regulating and / or regulating the heating system calibrate.
  • the characteristic curve can be described and / or defined by at least two values that characterize it.
  • a characteristic curve can be present, for example, in the form of a table and / or a functional specification or an algorithm.
  • the characteristic curve advantageously assigns at least one further operating parameter to at least one operating parameter of the heating system.
  • the characteristic curve can assign a setpoint value for an operating parameter to existing operating parameters and / or operating conditions.
  • operating parameters are to be understood as parameters that are used by a control unit of the heating system for controlling and / or monitoring and / or regulating and / or calibrating processes running in the heating system.
  • operating parameters are the fan speed, an ionization current on a flame of the heating system or a desired opening width of a fuel control valve.
  • characteristics are a fan speed characteristic which, for example, assigns a required fan speed to a required power, or a flame ionization characteristic which, for example, assigns a target ionization current to a fan speed.
  • a characteristic curve can also be part of a characteristic map. For example, the choice of a characteristic curve can depend on an operating parameter, for example a burner output.
  • characteristic curves are then stored in the control unit, each of which is selected as a function of the value of the operating parameter present. The set of characteristics assigned to a different value of the operating parameter in each case forms the characteristics map.
  • “Regulating the heating system” should be understood to mean setting operating parameters which is largely possible during normal, intended operation and largely does not interfere with normal, intended operation. Controlling the heating system can also be understood to mean at least partial setting of a characteristic curve. In particular, can when regulating, measured values are recorded or operating parameters are measured and taken into account when setting the operating parameters or the characteristic curve. For example, regulating the heating system can be understood to mean a regulating process running in the control unit which adapts the opening width of the fuel valve as a function of the combustion parameter recorded.
  • “Calibrating the heating system” should be understood to mean, in particular, an at least partially new setting, preferably a largely completely new setting, of a characteristic curve.
  • the heater can be operated in a special "calibration mode" which at least partially restricts or interrupts the normal, intended operation. For example, a performance spectrum of the heater can be run through to check a characteristic.
  • Controlling the heating system is to be understood as an operating mode of a heating system in which the components of the heating system are controlled by the control unit largely as a function of operating parameters and / or characteristics. In particular, largely no measured values should be recorded during control. In particular, the control should not depend on measured values or recorded operating parameters.
  • Update point is to be understood as a tuple or a set of values of operating parameters in which at least one operating parameter is determined or measured, in particular by regulating the heating system, in particular by a regulating process.
  • Detecting an update point along the characteristic curve should be understood to mean a determination of an update point which is provided to check an assignment or a point of the characteristic curve. For example, assigns the characteristic curve to a first operating parameter of the heating system to a second operating parameter, the heating system is operated with the first operating parameter. The heating system is regulated and / or calibrated and the second operating parameter set by the regulation and / or calibration is measured.
  • the update point comprises the first operating parameter and the measured second operating parameter.
  • the update point is suitable for checking the second operating parameter assigned to the first operating parameter by the characteristic curve, in particular by a comparison with the measured second operating parameter of the update point.
  • “New determination of the characteristic curve as a function of the at least two update points” should be understood to mean a new determination of the characteristic curve, in particular a calculation process in which an assignment by characteristic curve and / or a course of the characteristic curve is adapted at least in sections. If the characteristic curve is determined or defined, for example, by at least two values that characterize it, then these characterizing values can be determined as a function of the at least two update points for the new determination of the characteristic curve. If, for example, the characteristic curve is a table of values, the value pairs of which can be determined with a polynomial of the second order, then this polynomial or its functional rule can be defined by three coefficients. Three new coefficients can be uniquely determined depending on three update points. With the help of the new functional rule, new pairs of values can be determined for the characteristic.
  • the at least two update points are recorded in a closed loop mode.
  • “Closed-loop mode” should be understood to mean a control process in which a first operating parameter, which preferably corresponds to a control signal to a component of the heating system, for example to regulate a fuel supply, is set so that a second operating parameter largely has the value of a Target operating parameter assumes.
  • the first operating parameter is preferably adapted iteratively.
  • the first operating parameter is particularly preferably set as a function of a deviation of the second operating parameter from the setpoint operating parameter.
  • the heating system is preferably operated in a closed-loop mode when a burner output parameter is largely constant or changes sufficiently slowly or slightly.
  • “Burner output parameter” is to be understood in particular as a parameter which is correlated with the output, in particular a heating output, of the heating system.
  • the power, in particular the heating power, of the heating system can advantageously be determined, in particular by the control and / or regulating unit of the heating system, at least on the basis of the burner power parameter.
  • the burner output parameter advantageously corresponds to at least one or exactly one measured value representing the output or can be clearly assigned to such a measured value.
  • Such a measured value can be, for example, a temperature, an air flow rate, a fan control signal or a fan speed.
  • the characteristic curve is redetermined as a function of how much the at least two update points deviate from the characteristic curve, in particular by forming the difference, a particularly reliable setting of the characteristic curve is possible. In this way, for example, measured values that deviate too greatly, in particular due to measurement errors, can be taken into account when the at least two update points are recorded. Furthermore, unnecessary updates, for example if an update point deviates from the characteristic curve only within the scope of a measurement inaccuracy or signal noise.
  • the method is particularly advantageous if the characteristic curve can be described by a polynomial of the second degree or depends on it and is redefined as a function of three update points. In this way it is possible to update the characteristic particularly quickly.
  • the reliability of the method is further increased if the at least two update points are at least partially recorded at predetermined test points.
  • test points By defining test points, the technical properties of the heating system can be taken into account.
  • the new determination of the characteristic is particularly quick and precise.
  • the heating system is operated temporarily in a calibration mode as soon as a first update point is detected that deviates sufficiently from the characteristic curve and the heating system is operated in the calibration mode so that at least one further update point is detected, this has the advantage that changes which make a new determination of the characteristic necessary, can react particularly quickly.
  • the heating system is temporarily operated in a characteristic mode, with the heating system being controlled or regulated depending on the characteristic, this has the advantage that the heating system can largely be operated to its full extent if regulation cannot be carried out or can only be carried out to a limited extent. In particular, the heating system can thus continue to be operated when measured values cannot be recorded or when operating parameters cannot be measured.
  • a "characteristic mode" is understood to mean controlling the heating system. If, for example, in the closed-loop mode, a control signal is set in such a way that a first operating parameter assumes the value of a setpoint operating parameter, so In the characteristic mode, the heating system is controlled with a characteristic that assigns a control signal to a burner output parameter.
  • the reliability of the method is further increased if the heating system is operated in the characteristic curve mode, if a variation of a burner output parameter is greater than a limit variation and / or if a rate of variation of the burner output parameter is greater than a limit speed.
  • the regulation of the heating system in particular in a closed-loop mode, requires a certain amount of time to adjust to the new burner output parameter. During this time it is conceivable that the heating system or the combustion is not operated optimally. It can be advantageous, in particular with regard to emissions, if the heating system is operated in characteristic mode during the phase in which the burner output parameter is changed.
  • the characteristic curve is newly determined in characteristic curve mode as a function of the at least two update points, this has the advantage that the characteristic curve is not determined too quickly. It is possible that further update points can be acquired before the characteristic is required in characteristic mode. In this way, an unnecessary new determination of the characteristic curve is largely avoided.
  • a fluid supply parameter is set in the closed-loop mode in such a way that a combustion parameter is largely the same as a target combustion parameter, this allows a particularly efficient combustion process. In this way, emissions are largely reduced to a minimum.
  • a “fluid supply parameter” is to be understood in particular as a scalar parameter which, in particular, has at least one, in particular a burner unit of the heating system, fluid, in particular a combustion air flow, a fuel flow and / or a mixture flow, in particular of a combustion air and the fuel, is correlated.
  • a volume flow and / or a mass flow of the at least one fluid can advantageously be inferred and / or the volume flow and / or the mass flow of the at least one fluid can be determined, in particular by a control and / or regulating unit of the heating system, at least on the basis of the fluid supply parameter.
  • An example of a fluid supply parameter is the specification of an opening width of a fuel valve or a valve control signal to the fuel valve.
  • combustion parameter is to be understood in particular as a scalar parameter which is correlated in particular with a combustion, in particular of the mixture, in particular of the combustion air and the fuel.
  • An example of a combustion parameter is an ionization current, which is measured on a flame of the heating system.
  • the presence and / or quality of the combustion can be inferred and / or the presence and / or the quality of the combustion can be determined.
  • the combustion parameter advantageously corresponds to at least one or exactly one measured value depicting and / or characterizing the combustion, or the combustion parameter can be clearly assigned to such a measured value. Examples of a measured value depicting and / or characterizing the combustion are a combustion signal, in particular a light intensity, a pollutant emission, a temperature and / or advantageously an ionization signal.
  • a "target combustion parameter” is a desired value of the combustion parameter.
  • the combustion parameter takes the value of the If the desired combustion parameter increases, the combustion should proceed largely optimally, in particular with regard to emissions.
  • the target combustion parameter can be used, in particular, to regulate a heating system, in particular in a closed-loop mode.
  • the nominal combustion parameter can depend on further operating parameters, for example on the burner output parameter.
  • a target combustion characteristic can assign the required target combustion parameter to at least one further operating parameter, for example the burner output parameter.
  • control fluid supply parameter is to be understood as a value of the fluid supply parameter in which the combustion parameter largely equals the target combustion parameter in the closed-loop mode under the associated burner output parameter.
  • the “target fluid supply parameter” is a desired value that the fluid supply parameter should assume.
  • the fluid supply parameter is a valve control signal for a fuel valve and / or one or the combustion parameter is an ionization flow and / or one or the burner output parameter is a fan speed
  • the method is particularly reliable.
  • a particularly stable closed-loop mode is possible.
  • an efficient characteristic curve mode is possible.
  • the fluid supply parameter is a valve control signal for a fuel valve, this has the additional advantage that a particularly reliable and precise setting of a fluid supply or a fuel-air ratio is possible in this way.
  • the combustion parameter is an ionization current
  • this has the advantage that the ionization current has a functional and particularly favorable relationship to the fuel-air ratio. This allows precise and reliable regulation and / or control of the heating system with regard to the combustion quality and emissions.
  • An "ionization current" is determined by measuring an ionization current on a flame of the heating system.
  • a fan speed is a particularly easy to determine and reliable measure of the output of the heating system.
  • control unit for a heating system
  • the control unit being set up to carry out the method according to the present invention, has the advantage that the heating system can be operated reliably even under rapidly changing internal and / or external conditions. This enables the heating system to be operated largely without user intervention. This increases the ease of use as well as the availability and reliability of the heating system.
  • a heating system with a control unit according to the present invention with at least one fuel valve for a fuel, with an ionization probe on a flame and with a fan with variable fan speed has the advantage that the heating system can be operated conveniently, safely and with little maintenance.
  • a heater 10 is shown schematically, which is arranged on a memory 12 in the exemplary embodiment.
  • the heater 10 has a housing 14 which accommodates different components depending on the level of equipment.
  • the essential components are a heat cell 16, a control unit 18, one or more pumps 20 as well as piping 22, cables or bus lines 24 and holding means 26 in the heater 10.
  • the number and complexity of the individual components also depends on the degree of equipment of the heater 10.
  • the heat cell 16 has a burner 28, a heat exchanger 30, a fan 32, a metering device 34 as well as a supply air system 36, an exhaust system 38 and, when the heat cell 16 is in operation, a flame 40.
  • An ionization probe 42 protrudes into the flame 40.
  • the metering device 34 is designed as a fuel valve 44.
  • a fan speed 54 of the fan 32 is variably adjustable.
  • the heating device 10 and the memory 12 together form a heating system 46.
  • the control unit 18 has a data memory 48, a computing unit 50 and a communication interface 52. The components of the heating system 46 can be controlled via the communication interface 52.
  • the communication interface 52 enables data to be exchanged with external devices. External devices are, for example, control devices, thermostats and / or devices with computer functionality, for example smartphones.
  • Figure 1 shows a heating system 46 with a control unit 18.
  • the control unit 18 is located outside the housing 14 of the heater 10.
  • the external control unit 18 is designed in special variants as a room controller for the heating system 46.
  • the control unit 18 is mobile.
  • the external control unit 18 has a communication link to the heating device 10 and / or other components of the heating system 46.
  • the communication connection can be wired and / or wireless, preferably a radio connection, particularly preferably via WLAN, Z-Wave, Bluetooth and / or ZigBee.
  • the control unit 18 can consist of several components, in particular components that are not physically connected.
  • At least one or more components of the control unit 18 can be partially or entirely in the form of software that is installed on internal or external devices, in particular on mobile computing units, for example smartphones and tablets, or servers, especially a cloud.
  • the communication links are then corresponding software interfaces.
  • Figure 2 shows a method 56 for updating a characteristic curve 58 in a heating system 46.
  • the method 56 is mostly, preferably largely, operated in a closed-loop mode 60.
  • the fan speed 54 is kept largely constant or changed sufficiently slowly or changed sufficiently weakly.
  • the fan speed 54 is a in the exemplary embodiment
  • Burner performance parameters 62 In the closed-loop mode 60, a valve control signal 64 is set in such a way that an ionization current 66 largely assumes the value of a desired ionization 68.
  • the valve control signal 64 is a control signal which is sent to the fuel valve 44 and describes a desired opening width of the fuel valve 44.
  • the valve control signal 64 can be characterized by specifying the desired opening width of the fuel valve 44.
  • the desired opening width of the fuel valve 44 is described in the exemplary embodiment with a percentage between 0% and 100%, an opening width of 0% corresponding to a completely closed fuel valve 44 and an opening width of 100% corresponding to a completely open fuel valve 44. “Increase or decrease the valve control signal 64” means that the valve control signal 64 is changed in such a way that the desired opening width of the fuel valve 44 is increased or decreased compared to the last desired opening width of the fuel valve 44.
  • the valve control signal 64 is a fluid supply parameter 70.
  • the ionization current 66 is an electrical current measured by the ionization probe 42 at the flame 40 of the burner 28.
  • the ionization current 66 is a combustion parameter 72.
  • the detected ionization current 66 is received by the control unit 18.
  • the recorded ionization current 66 is compared largely continuously with the nominal ionization 68.
  • the current ionization current 66 is compared with the target ionization 68 at time intervals, preferably periodically.
  • the time intervals are preferably short compared to the time scales typical for regulating and / or controlling the heating system 46, for example between 10 ms and 10,000 ms, in particular between 100 ms and 1000 ms.
  • the nominal ionization 68 depends on the fan speed 54.
  • the required target ionization 68 is determined as a function of the fan speed 54 by means of a target ionization characteristic curve stored in the control unit 18.
  • the nominal ionization characteristic is determined by laboratory tests and adapted to the requirements of the heating system 46. It is conceivable that the nominal ionization characteristic or the nominal ionization 68 is determined by special methods during the operation of the heating system 46, in particular by methods for calibrating the heating system 46.
  • the nominal ionization 68 is a nominal combustion parameter 74.
  • the valve control signal 64 is increased in the exemplary embodiment. If the current ionization current 66 is greater than the nominal ionization 68, the valve control signal 64 is lowered. In the exemplary embodiment, the valve control signal 64 is increased or decreased all the more, the greater the deviation of the current ionization current 66 from the nominal ionization 68. A linear relationship is stored in the control unit 18 which assigns a change in the valve control signal 64 to a difference between the ionization current 66 and the nominal ionization 68.
  • the ionization threshold is a value stored in the control unit 18 to take account of Measurement inaccuracies or signal noise of the detected ionization current 66.
  • the ionization threshold depends on the burner power parameter 62.
  • the relationship stored in the control unit 18 between the difference between the ionization current 66 and the nominal ionization 68 and the change in the valve control signal 64 has the form of any desired, monotonically increasing function, in particular linear and / or quadratic and / or exponential and / or one Power function.
  • the fluid supply parameter 70 is changed and / or increased or decreased to a greater extent the greater the discrepancy between the currently detected combustion parameter 72 and the target combustion parameter 74.
  • a change in the valve control signal 64 changes a fuel-air ratio in a fuel-air mixture supplied to the burner 28.
  • the detected ionization current 66 changes as a function of the change in the valve control signal 64.
  • the valve control signal 64 can be changed iteratively in such a way that the detected ionization current 66 largely resembles the nominal ionization 68.
  • the set valve control signal 64 in which the detected ionization current 66 largely corresponds to the nominal ionization 68, is detected by the control unit 18 as an actuating valve control signal 76.
  • the actuating valve control signal 76 is an actuating fluid supply parameter 78.
  • the characteristic curve 58 is stored in the control unit 18.
  • the characteristic curve 58 is a valve control signal characteristic curve 80.
  • the characteristic curve 58 assigns a setpoint valve control signal 82 to the burner output parameter 62.
  • the setpoint valve control signal 82 has the value of a valve control signal 64.
  • the setpoint valve control signal 82 is a setpoint fluid supply parameter 84.
  • Figure 3 is the Valve control signal characteristic curve 80 is shown.
  • the burner output parameter 62 is shown on the abscissa axis 86.
  • the setpoint valve control signal 82 is mapped on the ordinate axis 88.
  • the setpoint valve control signal 82 increases monotonically with the burner output parameter 62.
  • the dependence of the setpoint valve control signal 82 on the burner output parameter 62 is largely quadratic or proportional to a polynomial of the second degree.
  • the characteristic curve 58 is a functional relationship stored in the control unit 18.
  • the characteristic curve 58 is determined by three coefficients of the polynomial of the second degree.
  • the target fluid supply parameter 84 is assigned to the burner output parameter 62, in which the value of the burner output parameter 62 is used in the functional relationship stored in the control unit 18, which represents the characteristic curve 58, and a functional value of the characteristic curve 58 is determined.
  • the functional value of the characteristic curve 58 is the setpoint fluid supply parameter 84.
  • the characteristic curve 58 is represented by any other functional relationship stored in the control unit 18.
  • the functional relationship representing the characteristic curve 58 is preferably a polynomial, preferably a degree less than ten, particularly preferably a degree less than five, in particular a linear function, and / or an exponential function and / or a rational function and / or a power function.
  • these types of functions can be combined, for example a polynomial multiplied by an exponential function.
  • the characteristic curve 58 can be represented by a table and / or a data field.
  • the characteristic curve 58 can have a finite number of data points which each assign a setpoint fluid supply parameter 84 to a burner output parameter 62.
  • the data points are preferably largely uniform on a definition range of the Burner output parameter 62 distributed. If a target fluid supply parameter 84 is to be determined for a burner output parameter 62 which is not described by a data point or is not sufficiently close to a data point, the required target fluid supply parameter 84 can be determined from at least two nearby data points, in particular interpolated or can be extrapolated. It is also conceivable that a data point assigns a setpoint fluid supply parameter 84 to an interval of the burner output parameter 62. The data points advantageously largely cover the definition range of the burner output parameter 62.
  • the actuating valve control signal 76 is compared with the associated setpoint valve control signal 82.
  • the actuating valve control signal 76 is compared largely continuously with the associated setpoint valve control signal 82 during the closed loop mode 60.
  • the associated setpoint valve control signal 82 is the setpoint valve control signal 82 which is assigned by the characteristic curve 58 to the fan speed 54 at which the actuating valve control signal 76 was determined.
  • the setting fluid supply parameter 78 is compared with the target fluid supply parameter 84 at time intervals, preferably at periodic time intervals, for example largely in the time intervals in which the combustion parameter 72 is compared with the target combustion parameter 74.
  • a difference is formed between the actuating valve control signal 76 and the setpoint valve control signal 82 and a check is made to determine whether an amount of this difference exceeds a tolerance limit.
  • the tolerance limit is 2%. In variants of the exemplary embodiment, the tolerance limit is between 0.1% and 5%. In the exemplary embodiment, the tolerance limit is a constant value stored in the control unit 18. In further variants of the exemplary embodiment, the The tolerance limit depends on operating parameters of the heating system 46, in particular on a combustion parameter 72. In the exemplary embodiment, the absolute value of the difference between the actuating valve control signal 76 and the setpoint valve control signal 82 is checked.
  • a relative deviation between the actuating valve control signal 76 and the setpoint valve control signal 82 is checked. For example, it can be checked whether the adjusting valve control signal 76 divided by the setpoint valve control signal 82 supplies a value which lies between a lower tolerance limit and an upper tolerance limit.
  • the lower tolerance limit can in particular assume values in a range between 0.9 and 0.99, in particular between 0.95 and 0.98.
  • the upper tolerance limit can in particular assume values in a range between 1.01 and 1.1, in particular between 1.02 and 1.05.
  • a calibration mode 92 is carried out in the closed loop mode 60 (see FIG Figure 2 ).
  • a first update point 94 is stored in the control unit 18.
  • the first update point has the actuating fluid supply parameter 78 and the associated burner output parameter 62.
  • a second update point 96 and a third update point 98 are acquired.
  • test points 100 stored in the control unit 18 are used.
  • three test points 100 are stored in the control unit 18.
  • the three test points 100 are exemplary embodiment at values of the fan speed 54 of 2800, 4100 and 5500.
  • the values of the fan speed 54 describe the number of revolutions per minute of an impeller of the fan 32.
  • the three test points 100 correspond to heating outputs of 6.2 kW, 9.8 kW and 13.4 kW. In alternative embodiments, the test points 100 can be any other Accept values.
  • the test points 100 preferably largely cover an entire parameter range of the burner output parameter 62 or at least one parameter range of the burner output parameter 62 that is relevant for the operation of the heating system 46.
  • the test points 100 are preferably distributed uniformly over a parameter range of the burner output parameter 62.
  • the two test points 100 are selected which differ most from the burner output parameter 62 of the first update point 94. These two test points 100 supply a first burner output parameter and a second burner output parameter.
  • the heating system 46 is then operated in such a way that the burner output parameter 62 successively assumes the values of the first burner output parameter and the second burner output parameter. In this case, the burner output parameters 62 are kept largely constant until the heating system 46 is regulated to a control fluid supply parameter 78.
  • the second update point 96 is stored and has the first burner output parameter together with the associated control fluid supply parameter 78.
  • the third update point 98 is stored and has the second burner output parameter together with the associated control fluid supply parameter 78.
  • the first update point 94 has an actuating valve control signal 76 of 34%.
  • the second update point 96 has an actuating valve control signal 76 of 29%.
  • the third update point 98 has an actuating valve control signal 76 of 40%.
  • the calibration mode 92 is carried out when the magnitude of the difference between the actuating valve control signal 76 and the target valve control signal 82 exceeds the tolerance limit.
  • all three burner output parameters 62 predetermined by the test points 100 are approached one after the other.
  • the burner output parameter 62 is kept largely constant until an actuating fluid supply parameter 78 can be determined.
  • the first update point 94, the second update point 96 and the third update point 98 are stored, each of which has a burner output parameter 62 with the associated control fluid supply parameter 78 predetermined by the three test points 100.
  • the characteristic curve 58 is then redefined.
  • the characteristic curve 58 is determined by the three coefficients of the polynomial of the second degree.
  • the control unit 18 redetermines the three coefficients.
  • the three coefficients are determined by an analytical calculation method in such a way that the three update points 94, 96 and 98 are largely described by the polynomial of the second degree or are largely on a graph of the polynomial of the second degree.
  • the calibration mode 92 is ended. In variants of the exemplary embodiment, the calibration mode 92 is ended as soon as all of the update points 94, 96 and 98 have been recorded.
  • the characteristic curve 58 is then determined in the closed loop mode 60.
  • burner power requirements which describe a requirement for the burner power parameter 62
  • a burner output request can be a user input and / or result from a heating schedule.
  • the control unit 18 checks whether a variation of the burner output parameter 62 required to implement the burner output requirement exceeds a limit variation and a required variation speed of the burner output parameter 62 exceeds a limit variation Exceeds limit speed. If the limit variation or the limit speed is exceeded, the closed-loop mode 60 is interrupted and the heating system 46 is operated in a characteristic curve mode 102 (see FIG Figure 2 ). In characteristic curve mode 102, heater 46 is controlled as a function of characteristic curve 58.
  • the setpoint valve control signal 82 is determined for the currently present burner output parameter 62 with the aid of the characteristic curve 58.
  • the desired valve control signal 82 is sent to the fuel valve 44. In this way, when the burner output is present, the opening width of the fuel valve 44 can be adapted immediately.
  • the closed-loop mode 60 a certain time elapses before a change in the valve control signal 64 has an effect on the detected ionization current 66. For this reason, it may be possible that if the burner output parameter 62 changes too sharply and / or too quickly, the valve control signal 64 is not regulated to the required actuating valve control signal 76 quickly enough.
  • the heating system 46 is preferably operated in the characteristic curve mode 102. If the burner output parameter 62 requested by the burner output requirement is reached, the characteristic curve mode 102 is ended and the method is continued in the closed-loop mode 60.
  • the characteristic curve 58 is described or defined by three coefficients.
  • three update points 94, 96 and 98 are determined.
  • the three coefficients can be determined unambiguously by means of the three update points 94, 96 and 98.
  • the number of update points corresponds to the number of coefficients or function parameters which describe or define characteristic curve 58.
  • the number of update points exceeds the number of coefficients or function parameters which describe or define characteristic curve 58.
  • the characteristic curve 58 can be fitted to the update points, in particular by means of statistical optimization methods and / or a compensation calculation and / or a regression calculation. In this way, in particular statistical deviations or outliers, for example caused by measurement errors, can be removed or taken into account in the update points.
  • the first update point 94 is detected as soon as a sufficient deviation of the actuating fluid supply parameter 78 from the setpoint fluid supply parameter 84 has been determined.
  • an update point is recorded as soon as an actuating fluid supply parameter 78 is determined.
  • the update point has the determined actuating fluid supply parameter 78 and the associated burner output parameter 62.
  • the update points recorded in this way can be stored at least temporarily in the memory 12 of the control unit 18.
  • the at least two most recently acquired update points can be used for the new determination of the characteristic curve 58.
  • the at least two most recently acquired update points can be used which are far enough apart in the parameter range of the burner output parameter 62. For this purpose, it can be checked, for example, whether the update points each have a certain distance from one another with regard to the burner output parameter 62. It can also be checked whether the update points cover a certain parameter range of the burner output parameter 62.
  • the characteristic curve 58 is redetermined in the characteristic curve mode 102. In these embodiments it is particularly advantageous if a sufficient number of update points is already available. In particularly advantageous variants of these embodiments, the characteristic curve 58 is redetermined at the beginning of the characteristic curve mode 102.
  • different characteristic curves 58 are stored in the control unit 18, the characteristic curve 58 used being selected as a function of the existing operating parameters and / or internal conditions and / or external conditions.
  • Figure 4 shows three different characteristic curves 58 which are each used for three different types of gas.
  • the burner output parameter 62 is shown on the abscissa axis 86.
  • the setpoint valve control signal 82 is mapped on the ordinate axis 88.

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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 (14)

  1. Procédé (56) d'actualisation d'une courbe caractéristique (58) dans un système de chauffage (46), au moins deux points d'actualisation (94, 96, 98) étant détectés le long de la courbe caractéristique (58) et la courbe caractéristique (58) étant à nouveau déterminée en fonction des au moins deux points d'actualisation (94, 96, 98),
    caractérisé en ce que
    les au moins deux points d'actualisation (94, 96, 98) sont détectés dans un mode en boucle fermée (60).
  2. Procédé (56) selon la revendication 1, caractérisé en ce que la courbe caractéristique (58) est à nouveau déterminée en fonction de l'écart entre les au moins deux points d'actualisation (94, 96, 98) de la courbe caractéristique (58), notamment par formation d'une différence.
  3. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que la courbe caractéristique (58) peut être décrite par un polynôme du deuxième degré ou dépend de celui-ci et est à nouveau déterminée en fonction de trois points d'actualisation (94, 96, 98).
  4. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que les au moins deux points d'actualisation (94, 96, 98) sont au moins partiellement détectés pour des points de test prédéterminés (100).
  5. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que le système de chauffage (46) est mis en fonctionnement temporairement dans un mode d'étalonnage (92) dès qu'un premier point d'actualisation (94) est détecté qui s'écarte suffisamment fortement de la courbe caractéristique (58) et le système de chauffage (46) est mis en fonctionnement en mode d'étalonnage (92) de façon à détecter au moins un autre point d'actualisation (96, 98) .
  6. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que le système de chauffage (46) est mis en fonctionnement temporairement dans un mode courbe caractéristique (102), le système de chauffage (46) étant commandé ou régulé en fonction de la courbe caractéristique (58).
  7. Procédé (56) selon la revendication 6, caractérisé en ce que le système de chauffage (46) est mis en fonctionnement en mode courbe caractéristique (102) lorsqu'une variation d'un paramètre de puissance de brûleur (62) est supérieure à une variation limite et/ou lorsqu'une vitesse de variation du paramètre de puissance de brûleur (62) est supérieure à une limite de vitesse.
  8. Procédé (56) selon l'une des revendications 6 et 7, caractérisé en ce que la courbe caractéristique (58) est à nouveau déterminée en mode courbe caractéristique (102) en fonction des au moins deux points d'actualisation (94, 96, 98).
  9. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que dans le mode en boucle fermée (60) un paramètre caractéristique d'alimentation en fluide (70) est réglé de sorte qu'un paramètre caractéristique de combustion (72) soit dans une large mesure égale à un paramètre caractéristique de combustion cible (74).
  10. Procédé (56) selon la revendication 9, caractérisé en ce qu'un point d'actualisation (94, 96, 98) présente un paramètre caractéristique d'alimentation en fluide de réglage (78), réglé en mode boucle fermée (60) et un ou le paramètre caractéristique de puissance de brûleur associé (62).
  11. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce que la courbe caractéristique (58) associe un paramètre caractéristique d'alimentation en fluide cible (84) à un ou au paramètre de puissance de brûleur (62).
  12. Procédé (56) selon l'une des revendications précédentes, caractérisé en ce qu'un ou le paramètre caractéristique d'alimentation en fluide (70) est un signal de commande de soupape (64) destiné à une soupape de combustible (44) et/ou un ou le paramètre caractéristique de combustion (72) est un flux d'ionisation (66) et/ou un ou le paramètre caractéristique de puissance de brûleur (62) est une vitesse de rotation de ventilateur (54).
  13. Unité de commande (18) destiné à un système de chauffage (46), l'unité de commande (18) étant conçu de façon à mettre en œuvre un procédé (56) selon l'une des revendications précédentes.
  14. Système de chauffage (46) comprenant une unité de commande (18) selon la revendication 13, au moins une soupape de combustible (44) destinée à un combustible, une sonde d'ionisation (42) au niveau d'une flamme (40) et un ventilateur (32) ayant une vitesse de rotation de ventilateur variable (54).
EP17187654.3A 2016-09-02 2017-08-24 Procédé d'actualisation d'une caractéristique dans un système de chauffage ainsi que unité de commande et système de chauffage Active EP3290800B1 (fr)

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DE102017204021.1A DE102017204021A1 (de) 2016-09-02 2017-03-10 Verfahren zum Aktualisieren einer Kennlinie in einem Heizsystem sowie eine Steuereinheit und ein Heizsystem

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EP4119847B1 (fr) * 2021-07-16 2023-06-14 Siemens Aktiengesellschaft Dispositif de combustion comprenant un dispositif de régulation
CN118332807B (zh) * 2024-04-23 2026-02-03 北京工业大学 一种基于特征的泵站机组特性工作点匹配曲线方法和系统

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DE10236979C1 (de) * 2002-08-13 2003-08-14 Stiebel Eltron Gmbh & Co Kg Verfahren zur Regelung des Verbrennungsvorganges in einem Verbrennungsmotor
EP2466204A1 (fr) * 2010-12-16 2012-06-20 Siemens Aktiengesellschaft Dispositif de réglage pour une installation de brûleur

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DE10025769A1 (de) * 2000-05-12 2001-11-15 Siemens Building Tech Ag Regeleinrichtung für einen Brenner
DE102007002847B4 (de) * 2007-01-15 2008-10-16 Honeywell Technologies Sarl Verfahren zum Regeln eines Gasbrenners
DE102011111453A1 (de) 2011-08-30 2013-02-28 Robert Bosch Gmbh Verfahren zur Luftzahleinstellung bei einem Heizgerät
DE102014224891A1 (de) * 2014-12-04 2016-06-09 Robert Bosch Gmbh Heizgerätevorrichtung und Verfahren zum Betrieb einer Heizgerätevorrichtung

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DE10236979C1 (de) * 2002-08-13 2003-08-14 Stiebel Eltron Gmbh & Co Kg Verfahren zur Regelung des Verbrennungsvorganges in einem Verbrennungsmotor
EP2466204A1 (fr) * 2010-12-16 2012-06-20 Siemens Aktiengesellschaft Dispositif de réglage pour une installation de brûleur

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