Dynamic Alarm Sensitivity Adjustment and Auto-Calibrating Smoke Detection
First Claim
1. A microprocessor controlled hazardous condition detection system comprising:
- a housing containing a sensor package, said sensor package containing sensors said sensors being exposed to the ambient environment and taking periodic readings of predetermined environmental conditions;
an alarm means coupled to said sensor package, disposed in said housing;
a microprocessor coupled to said alarm means and sensor package, said microprocessor having volatile and non-volatile memory, said non-volatile memory having an alarm differential value and a clean air default value stored therein;
wherein a default alarm threshold is determined by adding said differential value to said clean air default value;
wherein upon system power-up, said default air alarm threshold is loaded into said volatile memory;
said microprocessor receives periodic readings of predetermined environmental conditions from said sensor package, stores said periodic readings in said volatile memory, calculates the average of a plurality of said periodic readings and generates a new alarm threshold by shifting the default air alarm threshold loaded into said volatile memory by a value derived from the difference in the calculated average environmental reading and said clean air default value;
wherein upon detection of an ambient environmental condition outside of said alarm threshold stored in said volatile memory said microprocessor causes said alarm means to generate an alarm condition.
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Accused Products
Abstract
A microprocessor controlled hazardous condition detection system containing a sensor package, the sensor package containing sensors exposed to the ambient environment. The system also includes an alarm means coupled to the sensor package through a microprocessor having volatile and non-volatile memory. The microprocessor includes a memory storage device containing a plurality of alarm thresholds stored therein. Each of the plurality of alarm thresholds is associated with a predetermined set of ionization levels in the ambient environment. The microprocessor receives periodic ionization readings from the sensor package, and conditions the received readings by removing a selected amount of noise and attenuation therefrom. The microprocessor accumulates the conditioned ionization readings, selects and employs an optimized alarm threshold from the plurality of stored alarm thresholds, based on a set of the accumulated ionization readings. Upon detecting ionization levels in the ambient environment greater than the ionization levels linked to the selected alarm threshold the microprocessor causes the alarm means to generate an alarm condition.
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Citations
10 Claims
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1. A microprocessor controlled hazardous condition detection system comprising:
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a housing containing a sensor package, said sensor package containing sensors said sensors being exposed to the ambient environment and taking periodic readings of predetermined environmental conditions; an alarm means coupled to said sensor package, disposed in said housing; a microprocessor coupled to said alarm means and sensor package, said microprocessor having volatile and non-volatile memory, said non-volatile memory having an alarm differential value and a clean air default value stored therein; wherein a default alarm threshold is determined by adding said differential value to said clean air default value; wherein upon system power-up, said default air alarm threshold is loaded into said volatile memory;
said microprocessor receives periodic readings of predetermined environmental conditions from said sensor package, stores said periodic readings in said volatile memory, calculates the average of a plurality of said periodic readings and generates a new alarm threshold by shifting the default air alarm threshold loaded into said volatile memory by a value derived from the difference in the calculated average environmental reading and said clean air default value;wherein upon detection of an ambient environmental condition outside of said alarm threshold stored in said volatile memory said microprocessor causes said alarm means to generate an alarm condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A microprocessor controlled hazardous condition detection system comprising:
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a housing containing a sensor package, said sensor package containing an ionization type smoke sensor, said smoke sensor being exposed to the ambient environment and taking periodic readings of the ionization level in the ambient environment; an alarm means coupled to said sensor package, disposed in said housing; a microprocessor having volatile and non-volatile memory coupled to said sensor package and said alarm means said non-volatile memory having an alarm differential value and a clean air default value stored therein; wherein a default alarm threshold is determined by adding said differential value to said clean air default value; wherein said microprocessor receives periodic readings of the ionization levels in the ambient environment from said sensor package, stores said periodic readings in said volatile memory, calculates an average of a plurality of said periodic readings over a predetermined period of time, and generates a new alarm threshold by shifting the default air alarm threshold loaded into said volatile memory by a value generated from the difference in the calculated average environmental reading and said clean air default value; wherein upon detection of an ambient environmental condition outside of said alarm threshold stored in said volatile memory said microprocessor causes said alarm means to generate an alarm condition. - View Dependent Claims (10)
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Specification