×

Dynamic alarm sensitivity adjustment and auto-calibrating smoke detection

  • US 8,284,065 B2
  • Filed: 10/02/2009
  • Issued: 10/09/2012
  • Est. Priority Date: 10/03/2008
  • Status: Active Grant
First Claim
Patent Images

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 an ambient environment and taking periodic readings of predetermined environmental conditions;

    an alarm means associated with said sensor package and disposed in said housing;

    a microprocessor electronically 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 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 an average of a plurality of said periodic readings and generates a new alarm threshold by shifting the default 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 all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×