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Dynamic Alarm Sensitivity Adjustment and Auto-Calibrating Smoke Detection

  • US 20110018726A1
  • Filed: 09/30/2010
  • Published: 01/27/2011
  • Est. Priority Date: 10/03/2008
  • Status: Active Grant
First Claim
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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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