EP1172609B1 - Verfahren zur Drehzahlüberwachung eines Gebläses - Google Patents
Verfahren zur Drehzahlüberwachung eines Gebläses Download PDFInfo
- Publication number
- EP1172609B1 EP1172609B1 EP01107358A EP01107358A EP1172609B1 EP 1172609 B1 EP1172609 B1 EP 1172609B1 EP 01107358 A EP01107358 A EP 01107358A EP 01107358 A EP01107358 A EP 01107358A EP 1172609 B1 EP1172609 B1 EP 1172609B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- blower
- speed
- rotary speed
- speed measurement
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 title claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 23
- 238000010304 firing Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/08—Regulating air supply or draught by power-assisted systems
- F23N3/082—Regulating air supply or draught by power-assisted systems using electronic means
-
- 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 present invention relates to a method for monitoring the speed of a fan according to claim 1.
- the invention further relates to the use of the method in an automatic burner control according to the independent use claim.
- a method according to the preamble of claim 1 is, for example, from the publication DE 1975289A1 known. This shows a procedure for Speed monitoring of a fan, with a speed value of the Fan determined and with a reference value serving as a reference value is compared to determine if the fan is sufficient in one stationary state. The speed measurement value becomes directly the Purpose of regulation passed on.
- blower is known from EP 0 614 048 A1, for example a speed-controlled motor is driven.
- the speed control takes place via a control connection using pulse width modulation.
- the feedback of the speed takes place via a feedback connection.
- Simple and cheap speed monitoring uses the magnetization via the poles of the blower motor. However, this has a small number of measuring pulses during a measuring time, e.g. B. 0.2s, resulting in a low resolution of the speed and inaccurate measurement in the steady state. As a solution, an attempt was made to form an average over a longer period. In the case of rapid dynamic changes, however, the averaged value cannot follow the real value, ie the averaged value is not representative of the speed during the change.
- the present invention has for its object in a method of type mentioned at the outset a balance between the greatest possible accuracy in the enable steady state and errors in dynamic changes.
- the essence of the invention is therefore that a given value does not deviation of the measured speed value from the reference value the speed measured value is averaged with a filter of order n.
- the speed measurement value is measured in short time intervals so that it follows the real fan speed with all dynamic changes without errors, but is relatively inaccurate. If the blower steadily adjusts to a speed, the measured value is averaged.
- Fig. 1 shows schematically a burner control and automatic control 2 with an associated Fan 1.
- the speed 3 of the fan 1 is set on the automatic firing device 2 passed.
- the measurement of the speed can take place arbitrarily, for example as described in EP 0 614 048 A1 by a Hall probe.
- a speed filter 4 constructed according to the invention arranged, which the filtered speed to a monitoring device 5 and for further processing to an electronic network 6.
- the electronic network 6 is further via an ionization electrode 7, i.e. by the influenced by the signal generated by the electrode 7.
- the electronic network 6 controls then a gas valve 8 according to the existing combustion conditions.
- a power request signal 10 is generated via a temperature controller 9 and the blower 1 is controlled by means of the pulse-width modulated signal PWM generated.
- Fig. 2 shows a modified burner control 2 ', in which the speed is regulated becomes.
- the filtered speed is also sent to a comparison unit 11 passed.
- the comparison unit 11 the signals from the Power requirement 10 and from the speed filter 4 compared and to one Fan controller 12 passed on which again the fan 1 via Pulse-width-modulated signal controls PWM.
- Figure 3 shows the filter areas in a stationary state 14 applied in a Diagram time t versus speed n. Also shown are curves for Speed measurement values 15 and reference values 16.
- the speed measurement value 15 determined as above is compared with the reference signal 16 in order to determine whether the fan 1 is in a sufficiently stationary state.
- the reference signal 16 can also be the predefined setpoint value.
- the speed measurement value 15 is passed on directly. If the amount of the difference between the speed measurement value 15 and the reference signal 16 is smaller than the predetermined value, the speed is sufficiently stationary and the speed measurement value 15 is averaged with a filter of order n.
- the algorithm therefore takes advantage of the fact that the reference value 16 is one quasi-steady-state value, and that if the speed measurement value 15 is close to Reference value 16 is, the blower 1 is very slow to the stationary end value 14 approximates, so you can average over a longer period.
- a low-pass filter for example, is used as the speed filter and is constructed in terms of circuitry by means of electronic components.
- a software low-pass filter e.g. B. an FIR low pass or an IIR low pass with the order n can be used.
- the filter order can, for. B. with an FIR low-pass filter with each speed measurement value 15 until the maximum order n is reached.
- you can always filter with order 3 but the current speed measurement value 15 can be used directly as the output value.
- the filter value serves as a reference signal.
- the filter value is first increased by one order, that is to say from 3 to 4 and used as the output signal.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Electric Motors In General (AREA)
Description
Die Erfindung betrifft weiter die Verwendung des Verfahrens in einem Feuerungsautomaten nach dem unabhängigen Verwendungsanspruch.
Als Lösung wurde versucht einen Mittelwert über eine längere Zeit zu bilden. Bei schnellen dynamischen Änderungen kann der gemittelte Wert aber dem wirklichen Wert nicht folgen, d. h. der gemittelte Wert ist nicht repräsentativ für die Drehzahl während der Änderung.
Stellt sich das Gebläse stationär auf eine Drehzahl ein, so wird der Messwert gemittelt.
Das Referenzsignal 16 kann bei einer reinen Drehzahlerfassung ein Mittelwert aus den letzten m Messpunkten sein, beispielsweise mit m = 3. Bei einer Drehzahlregelung kann das Referenzsignal 16 auch der vorgegebene Sollwert sein.
Ist der Betrag der Differenz zwischen Drehzahlmesswert 15 und Referenzsignal 16 kleiner als der vorgegebene Wert, so ist die Drehzahl ausreichend stationär und der Drehzahlmesswert 15 wird mit einem Filter der Ordnung n gemittelt.
Um ein besseres Einrasten beim Umschalten vom ungefilterten in den gefilterten Wert zu erreichen, kann die Filterordnung z. B. bei einem FIR-Tiefpass mit jedem Drehzahlmesswert 15 anwachsen, bis die maximale Ordnung n erreicht ist. Z. B. kann bei dynamisch schnellen Änderungen immer mit der Ordnung 3 gefiltert, aber der aktuelle Drehzahlmesswert 15 direkt als Ausgangswert verwendet werden. Der Filterwert dient als Referenzsignal. Ist der Betrag der Differenz des Drehzahlmesswerts 15 kleiner als der vorgegebene Wert, so wird zunächst der Filterwert um eine Ordnung erhöht, also von 3 auf 4 und als Ausgangssignal verwendet. Beim nächsten Messergebnis ist die Filterordnung 5 usw., bis der Endwert n erreicht ist (z. B. n=6). Ab dann wird der älteste Wert gelöscht und der neue Drehzahlmesswert 15 zur Filterung verwendet, wie beim FIR-Filter üblich.
Claims (4)
- Verfahren zur Drehzahlüberwachung eines Gebläses (1), (insbesondere zur Verwendung in einem Feuerungsautomaten) (2) zur Einstellung der durch das Gebläse (1) geförderten Verbrennungsluft, wobei ein Drehzahlmesswert (15) des Gebläses (1) ermittelt und
der Drehzahlmesswert (15) des Gebläses (1) mit einem Referenzwert (16) verglichen wird, um zu ermitteln ob sich das Gebläse in einem ausreichend stationären Zustand befindet, dadurch gekennzeichnet, dass bei einer einen vorgegebenen Wert nicht übersteigenden Abweichung des Drehzahlmesswertes (15) vom Referenzwert (16) der Drehzahlmesswert (15) mit einem Filter der Ordnung n gemittelt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass als Filter ein Tiefpassfilter verwendet wird und dass beim Übergang in den stationären, gefilterten Zustand die Ordnung des Tiefpassfilters mit jedem neuem Messwert ansteigt, bis der Endwert für den stationären Zustand erreicht ist. - Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass der Referenzwert (16) ein Mittelwert aus letzten Drehzahlmesswerten (15) ist oder dass der Referenzwert (16) ein vorgegebener Sollwert ist. - Verwendung des Verfahrens nach einem der Ansprüche 1 bis 3 in einem Feuerungsautomaten (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH12612000 | 2000-06-26 | ||
| CH12612000 | 2000-06-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1172609A1 EP1172609A1 (de) | 2002-01-16 |
| EP1172609B1 true EP1172609B1 (de) | 2003-08-20 |
Family
ID=4565018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01107358A Expired - Lifetime EP1172609B1 (de) | 2000-06-26 | 2001-03-26 | Verfahren zur Drehzahlüberwachung eines Gebläses |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1172609B1 (de) |
| AT (1) | ATE247801T1 (de) |
| DE (1) | DE50100511D1 (de) |
| PL (1) | PL195859B1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITVI20120294A1 (it) * | 2012-10-30 | 2014-05-01 | Extraflame S P A | Procedimento di controllo del funzionamento dei motori di aspirazione fumi in apparecchi riscaldanti a combustibile solido |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH688842A5 (de) * | 1994-03-14 | 1998-04-15 | Landis & Gyr Tech Innovat | Einrichtung zur Ansteuerung des Motors des Gebläses eines Gebläsebrenners. |
| KR100295087B1 (ko) * | 1995-09-27 | 2001-09-17 | 전주범 | 가스보일러의역풍감지방법 |
| DE19752839B4 (de) * | 1997-11-28 | 2004-11-25 | Webasto Thermosysteme Gmbh | Verfahren zum Steuern eines Heizgeräts |
-
2001
- 2001-03-26 EP EP01107358A patent/EP1172609B1/de not_active Expired - Lifetime
- 2001-03-26 DE DE50100511T patent/DE50100511D1/de not_active Expired - Lifetime
- 2001-03-26 AT AT01107358T patent/ATE247801T1/de not_active IP Right Cessation
- 2001-06-18 PL PL348135A patent/PL195859B1/pl unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE247801T1 (de) | 2003-09-15 |
| EP1172609A1 (de) | 2002-01-16 |
| PL195859B1 (pl) | 2007-10-31 |
| DE50100511D1 (de) | 2003-09-25 |
| PL348135A1 (en) | 2002-01-02 |
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