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Dynamic alarm sensitivity adjustment and auto-calibrating smoke detection for reduced resource microprocessors

  • US 8,395,501 B2
  • Filed: 03/08/2011
  • Issued: 03/12/2013
  • Est. Priority Date: 11/23/2010
  • Status: Active Grant
First Claim
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1. A hazardous condition detection system, comprising,a housing containing a sensor package, the sensor package containing a hazardous condition sensor, the hazardous condition sensor being exposed to the ambient environment and taking periodic readings of the ambient environment;

  • an alarm circuit coupled to the sensor package and disposed in the housing;

    a microprocessor coupled to the alarm circuit, the microprocessor having a memory storage device containing a clean air reading and a plurality of alarm thresholds differential values, each of the plurality of alarm thresholds differential values being associated with a predetermined set of sensor readings indicative of a hazardous condition in the ambient environment,where said microprocessor periodically receives a raw sensor reading from the sensor package and preprocesses said received raw sensor reading using at least three distinctive filtering constants to generate a set of at least three conditioned sensor readings from each raw sensor reading received and where said microprocessor accumulates a plurality of sets of conditioned sensor readings, and selects an alarm threshold differential value from a plurality of stored alarm thresholds differential values based on the rate of change of the conditioned sensor readings in a first subset of accumulated conditioned sensor readings generated from a common filtering constant, and generates an alarm threshold from the selected alarm threshold differential value.

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