Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1990-07-18
1992-12-01
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340510, 340511, 340514, 340588, G08B 2300
Patent
active
051682621
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a fire alarm system in which a plurality of physical quantities such as heat, smoke or gases attributable to a fire phenomenon are detected time-serially for thereby making a decision or judgement as to the occurrence of a fire on the basis of the plurality of time-serial physical quantities.
BACKGROUND TECHNOLOGY
In connection with a fire decision made on the basis of a plurality of sensor levels that vary with time and are detected time-serially as detection information representative of physical quantities involved in a fire phenomenon, there can be conceived a so-called discriminative pattern identification method according to which a table containing patterns based on a plurality of time-serial sensor levels together with fire information for each of the patterns is prepared and stored in a ROM or the like, wherein the pattern information in the table is compared with time-serial sensor levels actually detected, for thereby allowing the fire decision to be made.
Further, it is also conceivable to define a function having as variables the values of a plurality of time-serial sensor levels, wherein the fire decision is made on the basis of input/output relations with the aid of the function.
In any case, the decision as to whether or not a fire is occuring is based on the detected sensor levels. In this conjunction, it is extremely desirable if the fire monitoring operation can be effectuated with highly improved accuracy by virtue of the capability to finely and thoroughly monitor fire phenomena inclusive of smoldering fires and flaming fires while making available the information concerning the possibility of a fire, i.e. fire probability and the level of danger as well as the capability of eliminating the possibility of false alarm generation due to noise or other causes.
Accordingly, a first object of the present invention is to provide a fire alarm system for making a decision as to the occurrence of a fire on the basis of a plurality of sensor levels detected time-serially, a system which is not only capable of making a decision as to the occurrence of a fire but also capable of finely and thoroughly monitoring the fire probability and the level of danger as well as fire phenomena inclusive of smoldering fires and flaming fires with regard to such situations or states which may lead to a fire while eliminating the possibility of erroneous or false alarm generation from the influence of noise or the like.
In case fire information corresponding to a plurality of time-serial sensor levels should be defined in a table stored in a ROM or the like as described above in an effort to accomplish the above object, an increase in the number of input points or data would involve a more explosive increase in the number of combinations of such inputs, requiring prodigious labor and a large capacity ROM table for describing all the combinations, which would be practically impossible. Further, description of the input/output relations in terms of the functions as mentioned above is also practically impossible because of the limitation encountered in expressing such complex relations, not to say of the elimination of the possibility of erroneous or false alarm generation due to the influence of noise by the method relying on a table or function.
Accordingly, a second object of the present invention is to provide a fire alarm system having a signal processing structure suited for achieving the first object mentioned above.
DISCLOSURE OF THE INVENTION
In view of the above objects, there is provided according to a first mode of carrying out the present invention a fire alarm system in which detection information output from fire phenomenon detecting means is subjected to signal processing for obtaining a value for at least one type of fire information, the fire alarm system comprising:
detection information collecting means for collecting time-serially a plurality of detection information values from the fire phenomenon detecting means, and
signal processing mea
REFERENCES:
patent: 4556873 (1985-12-01), Yamada et al.
patent: 4668939 (1987-05-01), Kimura et al.
patent: 4727359 (1988-02-01), Yuchi et al.
patent: 4818994 (1989-04-01), Orth et al.
patent: 4881060 (1989-11-01), Keen et al.
Crosland Donnie L.
Nohmi Bosai Kabushiki Kaisha
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