EP1157236B1 - Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives - Google Patents

Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives Download PDF

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Publication number
EP1157236B1
EP1157236B1 EP00916859A EP00916859A EP1157236B1 EP 1157236 B1 EP1157236 B1 EP 1157236B1 EP 00916859 A EP00916859 A EP 00916859A EP 00916859 A EP00916859 A EP 00916859A EP 1157236 B1 EP1157236 B1 EP 1157236B1
Authority
EP
European Patent Office
Prior art keywords
signal
sensor
unit
amplifier circuit
voltage divider
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.)
Expired - Lifetime
Application number
EP00916859A
Other languages
German (de)
English (en)
Other versions
EP1157236A1 (fr
Inventor
Willi Nyffenegger
Daniel Albrecht
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.)
Garrett Motion SARL
Original Assignee
Satronic AG
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Filing date
Publication date
Application filed by Satronic AG filed Critical Satronic AG
Publication of EP1157236A1 publication Critical patent/EP1157236A1/fr
Application granted granted Critical
Publication of EP1157236B1 publication Critical patent/EP1157236B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/22—Flame sensors the sensor's sensitivity being variable

Definitions

  • the invention relates to a device for flame monitoring in oil burners according to the preamble of claim 1.
  • Such devices for flame monitoring usually have one Sensor that detects the light from the flame of the burner and a corresponding one Signal generated, and via an amplifier circuit for evaluating the sensor detected signal.
  • the flame light to be detected by the sensor depends on the operating state of the oil burner over a wide dynamic range. With a "cold” oil burner - well when starting the oil burner - only a small signal is detected by the sensor, at one "Hot” oil burners, on the other hand, have a large signal. This dynamic brings that Problem with that the sensitivity requirements of such devices are variable in time, since both a safe start-up and switching off the oil burner must be guaranteed.
  • the present invention is based on the problem, one To create device for flame monitoring in oil burners, which is optimized.
  • the inventive device for flame monitoring shown in the drawing in oil burners has a sensor 10 and one assigned to the sensor 10 Amplifier circuit 11.
  • the sensor 10 monitors a flame, not shown also not shown oil burner. Specifically, it is the sensor 10 preferably around an infrared sensor that the light of the flame of the oil burner in the Infrared range is detected and a corresponding signal 12 is generated therefrom.
  • the Amplifier circuit 11 is used to evaluate the signal 12 detected by sensor 10
  • the sensor 10 is not an infrared sensor must be trained. Rather, other sensors for monitoring the Flame of the oil burner.
  • the amplifier circuit 11 automatically adjusts its sensitivity the actual level of the signal 12 detected by the sensor 10. This will ensures that the amplifier circuit 11 and thus that of the sensor 10 and the Amplifier circuit 11 existing device for flame monitoring independently of the condition of the burner, that is over the entire dynamic range of the flame of the Oil burner works reliably.
  • the amplifier circuit 11 has a voltage divider device 13, a Filter device 14, a rectifier device 15 and an amplifier device 16.
  • the signal 12 detected by the sensor 10 and a control signal 17 serve as Input variables for the voltage divider device 13.
  • the combination of fixed resistance and adjustable resistance is formed, the signal 12 detected by the sensor 10 and the control signal 17th offset such that the amplitude of the signal 12 detected by the sensor a defined amplitude is set.
  • This is set to the defined amplitude Signal is the output signal 18 of the voltage divider device 13, which of the filter device 14 is supplied as an input signal.
  • the filter device 14 comprises two Filters, namely a first bandpass filter 19 and a first bandpass filter 19 downstream second bandpass filter 20.
  • the rectifier device 15 fed from the output signal present in AC voltage 21 generates a rectified output signal 22.
  • the output signal 22 is concerned consequently around a filtered and adjusted to the defined amplitude rectified output signal of the sensor 10.
  • the rectifier device 15 has one with a diode 23 in series switched resistor 24, the series connection of the diode 23 and the Resistor 24 each with a capacitor 25 and a further resistor 26 are connected in parallel.
  • the output signal 22 of the rectifier device 15 is the Amplifier device 16 supplied as an input signal.
  • the Amplifier device 16 a via appropriately dimensioned resistors 27, 28 and 29 provided reference signal supplied as a setpoint.
  • the reference signal for the 1 is between the resistors 27 and 28 tapped.
  • the amplifier device 16 generates this from these input signals Control signal 17.
  • a configuration of the amplifier device 16 is particularly advantageous if it has a proportional / integral gain characteristic.
  • the output signal 22 of the rectifier device 15 is additionally one Comparator 30 supplied as an input signal, the output signal 22 of the rectifier device 15 with a reference value, which is between the resistors 29 and 27 is tapped.
  • This reference value for the comparator 30 is, for example 70% of the defined amplitude to which the signal 12 determined by the sensor 10 in the Voltage divider device 13 is set.
  • the output variable 31 is the Comparator 30 a flame signal ready, which information about the presence or the absence of the flame of the oil burner.
  • the amplitude of the signal 12 detected by the sensor 10 always is automatically normalized to the defined amplitude, the sensitivity of the Amplifier circuit 11 over the entire dynamic range of the flame of the oil burner optimized.
  • the amplifier device 16 has one Proportional / integral gain characteristic.
  • the gain characteristic of the Amplifier device 16 is designed such that a growing Output signal 22 is quickly adjusted, while a smaller one Output signal 22 is slowly corrected. This ensures that at one Flame failure the output signal 22 quickly below the threshold of preferably 70% falls and so the comparator safely and quickly a corresponding flame failure can report.
  • the gain characteristic of the amplifier device 16 is according to FIG further changeable by a signal 32. This property is important if the device according to the invention is used in multi-stage oil burners should come. For example, in connection with multi-stage oil burners at one Switching from one power level to another level of the oil burner abrupt change in lighting conditions with respect to the flame of the oil burner occur. It must be reliably prevented here that one caused thereby Reduction of the signal 12 detected by the sensor 10 as a flame cut or Flame failure is interpreted. This is done synchronously with a step changeover of the Oil burner on the signal 32, the gain characteristic of the amplifier device 16 set to a maximum. As a result, selectively Stage switching of the oil burner, the booster circuit 11 currently such made sensitive that with a sudden drop in the signal 12 due to a Step changeover safely to the presence of a flame of the oil burner can be closed.
  • the amplifier circuit 11 has a self-test function.
  • This is the amplifier circuit 11 a self-test signal 33 via a second voltage divider device 34 feedable.
  • the self-test signal 33 serves the second Voltage divider device 34 as an input variable, with an output variable 35 second voltage divider device 34 of the filter device 14, namely the first Bandpass filter 19, is provided as an input variable.
  • the self-test signal 33 is a sequence of pulses, being via the voltage divider device 34 synchronized with the pulses of the self-test signal 33, the amplification of the first bandpass filter 19 to preferably a third of its nominal gain is reduced.
  • An evaluation circuit not shown, that the comparator 30th is connected downstream, checks whether the comparator 30 in time with the pulses of the self-test signal 33 detected signal reduction.
  • the works Amplifier circuit 11 error-free. It is important that the Voltage divider device 34 does not increase the gain of the first bandpass filter 19 Is reduced to zero, but is only preferably divided into three or halved. If the amplifier device 16 overrides due to a fault, this is sufficient Thirds or halving the gain of the first bandpass filter 19 so that the Comparator 30 can respond to the pulses of the self-test signal 33 accordingly. An error is thus recognized. However, would the gain of the first bandpass filter 19th would be reduced to zero, even with an overdriving amplifier device 16 the comparator 30 react to the pulses in the self-test signal and could then Do not recognize errors.
  • the device according to the invention from the sensor 10 and the adaptive amplifier circuit 11 into a digital, microprocessor-controlled Control device or control device is integrated.
  • the device according to the invention can be optimally used. So a digital, microprocessor-controlled control unit or control device the output variable 31 of the Evaluate comparator 30 directly.
  • a digital control device or regulating device can also do this Generate self-test signal 33 and signal 32 safely and easily.
  • the control signal 17 can be easily evaluated in a simple manner.
  • the device according to the invention is integrated into one Microprocessor a cost saving, since the construction is simplified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Claims (10)

  1. Dispositif de contrôle de flamme pour brûleurs à mazout, comportant un capteur (10) et un circuit amplificateur (11) pour évaluer le signal (12) détecté par le capteur (10), la sensibilité du circuit amplificateur (11) s'adaptant automatiquement au niveau réel du signal (12) détecté par le capteur (10), caractérisé en ce qu'un signal de réglage (17) généré par le circuit amplificateur (11) et le signal (12) détecté par le capteur (10) sont compensés dans un dispositif diviseur de tension (13) du circuit amplificateur (11).
  2. Dispositif selon la revendication 1, caractérisé en ce que le signal de réglage (17) règle à une amplitude définie l'amplitude du signal (12) détecté par le capteur (10).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce qu'une grandeur de sortie (18) du dispositif diviseur de tension (13) traverse successivement un dispositif filtrant (14), un dispositif redresseur (15) et un dispositif amplificateur (16), et en ce que le signal de sortie du dispositif amplificateur (16) constitue le signal de réglage (17).
  4. Dispositif selon l'une au moins des revendications 1 à 3, caractérisé en ce que le dispositif diviseur de tension (13) est conçu comme une résistance réglable, et en ce que le dispositif filtrant (14) comprend de préférence deux filtres passe-bande (19, 20) montés en série.
  5. Dispositif selon l'une au moins des revendications 1 à 4, caractérisé en ce que le dispositif redresseur (15) comprend une résistance (24) montée en série avec une diode (23), et un condensateur (25) et une résistance (26) montés en parallèle par rapport à ces éléments.
  6. Dispositif selon l'une au moins des revendications 1 à 5, caractérisé en ce que le circuit amplificateur (11) comporte en outre un comparateur (30), le comparateur (30) comparant le signal de sortie (22) du dispositif redresseur (15) à une valeur de référence et générant à partir de là un signal de flamme (31) qui contient des informations sur la présence d'une flamme du brûleur à mazout.
  7. Dispositif selon l'une au moins des revendications 1 à 6, caractérisé en ce qu'un signal de contrôle automatique (33) peut être transmis au circuit amplificateur (11) et sert à une vérification de fonctionnement du circuit amplificateur (11).
  8. Dispositif selon la revendication 7, caractérisé en ce que le signal de contrôle automatique (33) peut être transmis à un second dispositif diviseur de tension (34), qui forme à partir de là un signal d'entrée pour le dispositif filtrant (14).
  9. Dispositif selon la revendication 7 ou 8, caractérisé en ce que le second dispositif diviseur de tension (34) réduit l'amplification d'un premier filtre passe-bande (19) en fonction du rythme des impulsions du signal de contrôle automatique (33), la vérification de fonctionnement du contrôle de flamme proprement dit étant en permanence prioritaire.
  10. Dispositif selon la revendication 9, caractérisé en ce que l'amplification du premier filtre passe-bande (19) est divisée par trois ou par deux, et n'est donc pas réduite à zéro.
EP00916859A 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives Expired - Lifetime EP1157236B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19908945A DE19908945C1 (de) 1999-03-02 1999-03-02 Vorrichtung zur Flammenüberwachung bei Ölbrennern mit adaptiven Eigenschaften
DE19908945 1999-03-02
PCT/EP2000/001464 WO2000052389A1 (fr) 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives

Publications (2)

Publication Number Publication Date
EP1157236A1 EP1157236A1 (fr) 2001-11-28
EP1157236B1 true EP1157236B1 (fr) 2003-06-25

Family

ID=7899348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00916859A Expired - Lifetime EP1157236B1 (fr) 1999-03-02 2000-02-23 Dispositif de surveillance de flammes pour bruleurs a mazout, a proprietes adaptatives

Country Status (6)

Country Link
EP (1) EP1157236B1 (fr)
AT (1) ATE243831T1 (fr)
AU (1) AU3805900A (fr)
DE (2) DE19908945C1 (fr)
ES (1) ES2204544T3 (fr)
WO (1) WO2000052389A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10247168B4 (de) * 2002-10-10 2004-09-09 Karl Dungs Gmbh & Co. Kg Flammenwächter mit Selbsttestfunktion und Verfahren zur Betriebsüberwachung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1425456A (en) * 1972-09-23 1976-02-18 Clarke Chapman Ltd Method and apparatus for monitoring electromagnetic radiation
US3903418A (en) * 1973-12-14 1975-09-02 Forney International Infrared dynamic flame detector
US4039844A (en) * 1975-03-20 1977-08-02 Electronics Corporation Of America Flame monitoring system
GB9019457D0 (en) * 1990-09-06 1990-10-24 Dresser Holmes Limited Flame monitoring apparatus and method
JPH05256441A (ja) * 1992-03-13 1993-10-05 Ishikawajima Harima Heavy Ind Co Ltd 燃焼診断装置
DE19650972C2 (de) * 1996-12-09 2001-02-01 Elbau Elektronik Bauelemente G Verfahren und Anordnung zur Überwachung und Regelung von Verbrennungsprozessen

Also Published As

Publication number Publication date
AU3805900A (en) 2000-09-21
DE50002643D1 (de) 2003-07-31
ATE243831T1 (de) 2003-07-15
WO2000052389A1 (fr) 2000-09-08
EP1157236A1 (fr) 2001-11-28
ES2204544T3 (es) 2004-05-01
DE19908945C1 (de) 2000-11-02

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