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Method of controlling a motorized window treatment

  • US 9,933,761 B2
  • Filed: 03/15/2013
  • Issued: 04/03/2018
  • Est. Priority Date: 11/30/2012
  • Status: Active Grant
First Claim
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1. A method of controlling a motorized window treatment for adjusting an amount of sunlight entering a space of a building through a window to control a sunlight penetration distance in the space, the method comprising:

  • measuring a total light intensity at the window;

    determining if the total light intensity exceeds a cloudy-day threshold;

    enabling a sunlight penetration limiting mode in response to determining that the total light intensity is greater than the cloudy-day threshold;

    operating in the sunlight penetration limiting mode to control the motorized window treatment to thus control the sunlight penetration distance in the space, the sunlight penetration limiting mode causing partial opening of the motorized window treatment to a respective calculated position corresponding to each of a plurality of times so as to admit direct sunlight into the space within a predetermined maximum sunlight penetration distance from the window, such that the respective calculated sunlight penetration distance corresponding to each of the plurality of times is below the predetermined maximum sunlight penetration distance; and

    disabling the sunlight penetration limiting mode in response to determining that the total lighting intensity is less than the cloudy-day threshold;

    wherein the cloudy-day threshold varies with time during a first period after sunrise and during a second period before sunset, and is maintained at a constant threshold during a third period near midday.

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