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Light timeout optimization

  • US 8,538,596 B2
  • Filed: 12/20/2010
  • Issued: 09/17/2013
  • Est. Priority Date: 12/20/2010
  • Status: Active Grant
First Claim
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1. A lighting controller for adjusting a timeout value of a lamp, which illuminates a lighting area, the lighting controller comprising:

  • a memory comprising sensor data that includes a plurality of motion trips; and

    an occupancy model configured to determine a plurality of durations from the plurality of motion trips, wherein each respective one of the durations is a time difference between two consecutive motion trips that are in the plurality of motion trips, wherein the occupancy model is further configured to determine a false-negative rate for the lamp based on a detection of a peak in a frequency of the durations that are in a predetermined time range as compared to a frequency of the durations that are outside of the predetermined time range, the predetermined time range including values larger than the timeout value of the lamp, the false-negative rate representing a frequency at which the lamp is timed out when the lighting area is occupied; and

    a demand model configured to increase the timeout value of the lamp in response to the false-negative rate being above a threshold false-negative rate, and to decrease the timeout value of the lamp in response to the false-negative rate being below the threshold false-negative rate.

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