Apparatus and method for discrimination of fire types
First Claim
1. A variable sensitivity detector comprising:
- at least first and second, different, ambient condition sensors for generating respective first and second outputs indicative of respective sensed ambient conditions;
coefficient circuitry, responsive to said outputs, for forming continuously variable first and second weighing coefficients for respective of said outputs;
circuitry for combining said weighing coefficients with respective of said outputs, thereby forming respective first and second weighted outputs; and
circuitry for summing said weighted outputs thereby forming a processed output value.
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Abstract
A multiple sensor smoke detector includes at least an ionization and a photoelectric sensor. Outputs from the sensors are fed to circuitry for generating continuously variable coefficients. One coefficient corresponds to each sensor output. Respective coefficients and sensor outputs are multiplied in multiplier circuitry to produce processed outputs. The processed outputs are combined in a summing circuit to produce at least one output value indicative of a level of detected smoke. The coefficient generating circuitry, the multiplier circuitry and the combining circuitry could be implemented in a programmed microprocessor. The coefficient generating circuitry could be implemented using prestored membership functions indicative of various types of fires.
40 Citations
29 Claims
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1. A variable sensitivity detector comprising:
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at least first and second, different, ambient condition sensors for generating respective first and second outputs indicative of respective sensed ambient conditions; coefficient circuitry, responsive to said outputs, for forming continuously variable first and second weighing coefficients for respective of said outputs; circuitry for combining said weighing coefficients with respective of said outputs, thereby forming respective first and second weighted outputs; and circuitry for summing said weighted outputs thereby forming a processed output value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fire detector with a sensitivity parameter which varies in accordance with fire type, the detector comprising:
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a first type of fire sensor for generating a first fire output; at least a second type of fire sensor for generating a second fire output; circuitry, coupled to said sensors, for processing said outputs and for producing first and second, varying coefficients wherein said processing circuitry includes circuitry for storing at least one membership function indicative of fire type and circuitry for combining said fire outputs with respective ones of said coefficients thereby forming first and second processed outputs. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A variable sensitivity detector comprising:
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a plurality of ambient condition sensors for generating respective ambient condition outputs; a storage unit for storing a set of predetermined production rules; circuitry for processing said outputs, in response to said production rules, thereby producing a plurality of continuously variable coefficients; and circuitry for combining respective ones of said outputs with respective ones of said coefficients thereby producing a plurality of adjusted outputs. - View Dependent Claims (21, 22, 23, 24)
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25. A method of detecting the presence of different ambient conditions comprising:
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storing a set of predetermined rules pertaining to at least first and second different ambient conditions; sensing at least first and second different ambient conditions and generating respective first and second indicia indicative thereof; implementing the prestored rules to process the indicia thereby providing first and second coefficients wherein each of the coefficients is indicative of the level of one of the ambient conditions relative to the other. - View Dependent Claims (26, 27, 28, 29)
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Specification