Occupancy sensor and method of operating same

  • US 6,415,205 B1
  • Filed: 08/26/1999
  • Issued: 07/02/2002
  • Est. Priority Date: 02/04/1997
  • Status: Expired due to Term
First Claim
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1. An occupancy based load controller, comprising:

  • a plurality of occupancy sensors for producing a respective plurality of occupancy estimator signals, each indicative of motion within a space;

    a programmable microprocessor, connected to said plurality of occupancy sensors, for calculating a composite occupancy estimator from said plurality of occupancy estimator signals, and for comparing said composite occupancy estimator to a programmable composite activation threshold, said programmable microprocessor being operable to adaptively adjust a sensitivity of at least one of said plurality of occupancy sensors;

    a controllable load energizing device responsive to said programmable microprocessor, operable to automatically energize an electrical load when said microprocessor determines that said composite occupancy estimator is greater than said composite activation threshold; and

    wherein said sensitivity of said at least one of said plurality of occupancy sensors is adjusted by said programmable microprocessor as a function of an energization state of said electrical load, said programmable microprocessor calculating an average time between determinations by said programmable microprocessor that said composite occupancy estimator is greater than said composite activation threshold, wherein said sensitivity of said at least one of said plurality of occupancy sensors is adjusted by said programmable microprocessor as a function of said average time.

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