EP0772855B1 - Brandmelder mit korrektur von störparametern - Google Patents

Brandmelder mit korrektur von störparametern Download PDF

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Publication number
EP0772855B1
EP0772855B1 EP95926986A EP95926986A EP0772855B1 EP 0772855 B1 EP0772855 B1 EP 0772855B1 EP 95926986 A EP95926986 A EP 95926986A EP 95926986 A EP95926986 A EP 95926986A EP 0772855 B1 EP0772855 B1 EP 0772855B1
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EP
European Patent Office
Prior art keywords
correction
signal
fire
value
measurement signal
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Expired - Lifetime
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EP95926986A
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English (en)
French (fr)
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EP0772855A1 (de
Inventor
Jacques Lewiner
Eugeniusz Smycz
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ORWIN
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Orwin
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/18—Prevention or correction of operating errors
    • G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system

Definitions

  • the present invention relates to devices fire detection, and more specifically to such devices that include a fire sensor for measure a first physical quantity including a variation is significant of the existence of a fire in the vicinity of the detection device, this fire sensor generating an analog electrical signal, called measurement signal, which has a value representative of the first physical quantity, this measurement signal being influenced by at least one second physical quantity different from the first physical quantity, the device further comprising least one correction sensor for measuring said second physical quantity and generate an analog electrical signal, said correction signal, which has a representative value of the second physical quantity, in order to correct the influence of this second physical quantity on the measurement signal.
  • the correction sensor used for this was a thermistor which was associated with the aforementioned amplifier, the characteristics of this thermistor being chosen to compensate for variations as best as possible amplifier gain as a function of temperature.
  • document EP-A-0 418 409 describes a fire detection device comprising both a fire sensor and at least one correction sensor which are both connected to the same programmable central unit to transmit the signals of measurement and correction.
  • the central unit is programmed to digitally compensate the measurement signal according to the correction signal, thereby calculating a corrected value of the measurement signal.
  • this correction involves an overload of the operation of the central unit, since with each acquisition of the measurement signal, you must also acquire the correction signal and calculate the corrected value. This overload is all the more sensitive as the calculation of the corrected value is complex.
  • the object of the present invention is in particular to remedy the aforementioned drawbacks.
  • the detector 1 comprises a central unit programmable constituted by a microprocessor 2 which has at least two analog inputs 2a, 2b.
  • the first analog input 2a is connected to a fire sensor 3 which measures a first quantity physical whose variations make it possible to detect the existence a fire in the vicinity of the fire sensor.
  • This fire sensor can be for example an ion sensor smoke detection, or possibly an optical sensor smoke detection, or whatever.
  • the fire sensor sends to the first entry analog 2a microprocessor electrical signal analog i which has a value (e.g. intensity or voltage) representative of the first physical quantity.
  • a value e.g. intensity or voltage
  • This measurement signal i is disturbed by at least one second physical quantity different from the first, by for example by ambient temperature, or by humidity or the ambient pressure in the case of a sensor ionic.
  • this second quantity physical detector 1 further includes a correction 4 which measures the second physical quantity, and which is connected to the second analog input 2b of the microprocessor to send a signal to this microprocessor electric analog ⁇ , said correction signal, which has a value (for example current or voltage) representative of the second physical quantity.
  • a correction 4 which measures the second physical quantity, and which is connected to the second analog input 2b of the microprocessor to send a signal to this microprocessor electric analog ⁇ , said correction signal, which has a value (for example current or voltage) representative of the second physical quantity.
  • the microprocessor 2 has an internal memory, or possibly it can be connected to an external memory, in which case the central unit is constituted by the microprocessor and its external memory.
  • this memory is stored, in the form of a table of values, a curve c such as that shown in FIG. 2, giving, in function of the correction signal ⁇ , a normal value i0 of measurement signal in the absence of fire.
  • Microprocessor 2 is programmed to determine permanently the value of i0 corresponding to the signal of correction ⁇ and to compare the measurement signal i to this value i0: if the measurement signal i is not between iO - ⁇ 1 and i0 + ⁇ 2, where ⁇ 1 and ⁇ 2 are predetermined values (for example, ⁇ 1 and ⁇ 2 can be worth 5% of i0), the microprocessor 2 deduces the existence of a fire at in the vicinity of detector 1, and transmits an alarm signal to a central unit 5, by any known connection means, such as that connection to current loops, bus connection, ... etc.
  • detector 1 may include several correction sensors 4, 6 each connected to a analog input 2b, 2c of microprocessor 2, without leaving of the scope of the invention.
  • the microprocessor 2 has in memory a correspondence table giving, according to the signals of correction transmitted by the various correction sensors, normal values i0 of the measurement signal in the absence of fire. As before, microprocessor 2 then continuously calculates the normal value i0 of the signal and then compares the value of the measurement signal i received at its analog input 2a at the normal value i0, as explained above, to determine if there is a fire.
  • the calculation of the normal value i0 could be performed using an algorithm stored in the microprocessor 2 or in an external memory.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)

Claims (7)

  1. Feuermeldevorrichtung (1), enthaltend einen Feuersensor (3) zum Messen einer ersten physikalischen Größe, deren Veränderung einen Brand in der Nähe der Feuermeldevorrichtung (1) anzeigt, wobei der Feuersensor ein elektrisches Analogsignal (i), d.h. ein Meßsignal, erzeugt, welches einen repräsentativen Wert der ersten physikalischen Größe besitzt, wobei ferner dieses Meßsignal von wenigstens einer zweiten physikalischen Größe beeinflußt wird, die sich von der ersten physikalischen Größe unterscheidet, wobei die Vorrichtung außerdem einen Korrektursensor (4, 6) zum Messen der zweiten physikalischen Größe und zum Erzeugen wenigstens eines elektrischen Analogsignals (), d.h. eines Korrektursignals, aufweist, welches einen repräsentativen Wert der zweiten physikalischen Größe besitzt, im Hinblick darauf, daß der Einfluß dieser zweiten physikalischen Größe auf das Meßsignal korrigiert wird, wobei die Feuersensoren (3) und die Korrektursensoren (4) mit einer programmierbaren Zentraleinheit (2) verbunden sind, um sowohl die Meßsignale als auch die Korrektursignale an sie zu übertragen,
    dadurch gekennzeichnet, daß die Zentraleinheit in ihrem Speicher Korrekturmittel enthält, die abhängig vom Wert des Korrektursignals () einen Wert i0, d.h. einen Normalwert des Meßsignals (i) bei Nichtvorhandensein eines Brandes, und die Zentraleinheit so programmiert ist, daß
    sie den Normalwert i0 des Meßsignals abhängig vom Wert des Korrektursignals , ausgehend von den Korrekturmitteln, bestimmt,
    und das Vorhandensein eines Brandes bestimmt, wenn das Meßsignal nicht zwischen i0 - Δ1 und i0 + Δ2 liegt, wobei Δ1 und Δ2 vorgegebene Werte sind.
  2. Vorrichtung nach Anspruch 1, bei der die Speicherkorrekturmittel der Zentraleinheit (2) aus einer Zuordnungstabelle bestehen.
  3. Vorrichtung nach Anspruch 1, bei der die Speicherkorrekturmittel der Zentraleinheit (2) durch einen Algorithmus gebildet werden.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der die zweite physikalische Größe die Umgebungstemperatur ist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 3, bei der der Feuersensor ein Ionensensor und die zweite physikalische Größe die Raumfeuchtigkeit ist.
  6. Vorrichtung nach einem der Ansprüche 1 bis 3, bei der der Feuersensor ein Ionensensor und die zweite physikalische Größe der Umgebungsdruck ist.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, bei der das Meßsignal (i) von mehreren zweiten physikalischen Größen beeinflußt wird, wobei die Vorrichtung mehrere Korrektursensoren (4, 6) enthält, von denen jeder mit der Zentraleinheit (2) verbunden ist, um an sie jeweils ein Meßsignal () zu übertragen, welches ein repräsentativer Wert einer der zweiten physikalischen Größen ist, wobei die Speicherkorrekturmittel in der Zentraleinheit (2) den Normalwert i0 des Meßsignals (i) abhängig von den Werten der Korrektursignale liefern und wobei die Zentraleinheit (5) so programmiert ist, daß sie den Normalwert des Meßsignals abhängig von den Werten der Korrektursignale, ausgehend von den Korrekturmitteln, bestimmt.
EP95926986A 1994-07-29 1995-07-27 Brandmelder mit korrektur von störparametern Expired - Lifetime EP0772855B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9409471A FR2723235B1 (fr) 1994-07-29 1994-07-29 Dispositifs de detection d'incendie comportant un capteur de correction
FR9409471 1994-07-29
PCT/FR1995/001016 WO1996004631A1 (fr) 1994-07-29 1995-07-27 Dispositif de detection d'incendie avec correction de parametres perturbateurs

Publications (2)

Publication Number Publication Date
EP0772855A1 EP0772855A1 (de) 1997-05-14
EP0772855B1 true EP0772855B1 (de) 1998-12-02

Family

ID=9465920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95926986A Expired - Lifetime EP0772855B1 (de) 1994-07-29 1995-07-27 Brandmelder mit korrektur von störparametern

Country Status (6)

Country Link
EP (1) EP0772855B1 (de)
JP (1) JPH11509342A (de)
DE (1) DE69506418D1 (de)
ES (1) ES2126916T3 (de)
FR (1) FR2723235B1 (de)
WO (1) WO1996004631A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59808963D1 (de) * 1997-10-21 2003-08-14 Siemens Ag Raumüberwachungssensor
JP3724689B2 (ja) * 1998-10-30 2005-12-07 ホーチキ株式会社 火災監視装置及び火災感知器
JP3708727B2 (ja) * 1998-10-30 2005-10-19 ホーチキ株式会社 火災感知器及び火災検出方法
US6958689B2 (en) 2001-09-21 2005-10-25 Rosemount Aerospace Inc. Multi-sensor fire detector with reduced false alarm performance
US7333129B2 (en) 2001-09-21 2008-02-19 Rosemount Aerospace Inc. Fire detection system
JP4769933B2 (ja) * 2005-03-28 2011-09-07 国立大学法人 岡山大学 イオンセンサ及びこのイオンセンサを用いた検出器
DE102010015467B4 (de) * 2010-04-16 2012-09-27 Winrich Hoseit Brandmelder zur Überwachung eines Raumes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU573243B2 (en) * 1983-08-12 1988-06-02 Vision Systems Limited Pollution detecting apparatus
ATE132642T1 (de) * 1989-09-19 1996-01-15 Siemens Ag Verfahren und vorrichtung zur berücksichtigung klimatischer umgebungseinflüsse auf automatische brandmelder

Also Published As

Publication number Publication date
JPH11509342A (ja) 1999-08-17
EP0772855A1 (de) 1997-05-14
ES2126916T3 (es) 1999-04-01
WO1996004631A1 (fr) 1996-02-15
FR2723235A1 (fr) 1996-02-02
FR2723235B1 (fr) 1996-10-18
DE69506418D1 (de) 1999-01-14

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