Window treatment control using bright override
First Claim
1. A system comprising:
- a motorized window treatment configured to be positioned adjacent to a window of a room, the motorized window treatment having at least one motor drive unit for adjusting a position of the window treatment;
a sensor for measuring a light intensity level at the window;
a controller; and
a memory having instructions stored thereon that when executed by the controller direct the controller to;
provide signals to the at least one motor drive unit to automatically adjust the position of the window treatment so as to control a penetration distance of sunlight into the room;
store a timeclock schedule including a number of timeclock events between a start time and an end time, the timeclock events including respective positions of the motorized window treatment at a plurality of different times between the start time and the end time, the penetration distance controlled according to the timeclock schedule such that the penetration distance will not exceed a sunlight penetration distance threshold at any of the plurality of different times;
determine an angle of incidence between light rays from the sun to the window and a surface normal line perpendicular to a surface of the window;
set a bright threshold value to a first predetermined light intensity value when the determined angle of incidence is within a first range of values, and set the bright threshold value to a second predetermined light intensity value when the determined angle of incidence is within a second range of values, the first predetermined light intensity value being different from the second predetermined light intensity value;
determine from the sensor a measured light intensity level;
compare the measured light intensity level to the bright threshold value;
compute a position of the window treatment using the stored timeclock schedule when the measured light intensity level is less than the bright threshold value; and
adjust the position of the window treatment to a predetermined bright override position when the measured light intensity level is greater than the bright threshold value.
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Accused Products
Abstract
A system includes a window treatment adjacent to a window of a room. At least one motor drive unit is associated with the window treatment, for varying the position of the window treatment. A sensor measures a light level (e.g., an outdoor light level) at the window. A controller provides signals to the motor drive unit to automatically adjust the position of the window treatment so as to control a penetration distance of sunlight into the room when the window treatment is partially opened. The controller is configured to position the window treatment in a bright override position if the measured light level is at least a bright threshold value. The controller is configured to select the bright threshold value from among at least two predetermined values. The selection depends on an angle of incidence between light rays from the sun and a surface normal of the window.
132 Citations
26 Claims
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1. A system comprising:
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a motorized window treatment configured to be positioned adjacent to a window of a room, the motorized window treatment having at least one motor drive unit for adjusting a position of the window treatment; a sensor for measuring a light intensity level at the window; a controller; and a memory having instructions stored thereon that when executed by the controller direct the controller to; provide signals to the at least one motor drive unit to automatically adjust the position of the window treatment so as to control a penetration distance of sunlight into the room; store a timeclock schedule including a number of timeclock events between a start time and an end time, the timeclock events including respective positions of the motorized window treatment at a plurality of different times between the start time and the end time, the penetration distance controlled according to the timeclock schedule such that the penetration distance will not exceed a sunlight penetration distance threshold at any of the plurality of different times; determine an angle of incidence between light rays from the sun to the window and a surface normal line perpendicular to a surface of the window; set a bright threshold value to a first predetermined light intensity value when the determined angle of incidence is within a first range of values, and set the bright threshold value to a second predetermined light intensity value when the determined angle of incidence is within a second range of values, the first predetermined light intensity value being different from the second predetermined light intensity value; determine from the sensor a measured light intensity level; compare the measured light intensity level to the bright threshold value; compute a position of the window treatment using the stored timeclock schedule when the measured light intensity level is less than the bright threshold value; and adjust the position of the window treatment to a predetermined bright override position when the measured light intensity level is greater than the bright threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus comprising:
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a controller; and a memory having instructions stored thereon that when executed by the controller direct the controller to; provide signals to a motor drive unit to automatically adjust a position of a window treatment so as to control a penetration distance of sunlight into a room; store a timeclock schedule including a number of timeclock events between a start time and an end time, the timeclock events including respective positions of the motorized window treatment at a plurality of different times between the start time and the end time, the penetration distance controlled according to the timeclock schedule such that the penetration distance will not exceed a sunlight penetration distance threshold at any of the plurality of different times; determine an angle of incidence between light rays from the sun to a window and a surface normal line perpendicular to a surface of the window; set a bright threshold value to a first predetermined light intensity value when the determined angle of incidence is within a first range of values, and set the bright threshold value to a second predetermined light intensity value when the determined angle of incidence is within a second range of values, the first predetermined light intensity value being different from the second predetermined light intensity value; determine from a sensor a measured light intensity level; compare the measured light intensity level to the bright threshold value; compute a position of the window treatment using the stored timeclock schedule when the measured light intensity level is less than the bright threshold value; and adjust the position of the window treatment to a predetermined bright override position when the measured light intensity level is greater than the bright threshold value. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification