Electric light and daylight control system with a dual-mode light sensor
First Claim
1. A method of controlling light luminosity in a space including an installed light source and an external light source, comprising:
- measuring, using a first controller, individual light intensity components from the installed light source at a location within the space;
measuring, using a second controller, individual light intensity components from the external light source at the location within the space;
controlling automatically an intensity level of the installed light source and an amount of light from the external light source entering the space by using the first controller and the second controller, respectively, wherein the controlling of the intensity level is based on the measured light intensity components; and
tuning automatically the intensity level of the installed light source and the amount of external light entering the space simultaneously by using the first controller and the second controller, respectively, in order to optimize a combined light intensity measured from said light sources as close to a pre-defined target luminance level at said location and minimize an amount of energy consumed by the installed light source, the first controller and the second controller being configured to execute independently and in parallel;
wherein the tuning is performed by iteratively adjusting the intensity of the installed light source by a first adaptation step size and the amount of external light entering the space by a second adaptation step size, wherein the first and second adaptation step sizes depend on a difference between the pre-defined target luminance level and the combined light intensity measured, and on an energy consumption.
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Abstract
An electric light and external light control system for a space with a dual-mode light sensor is proposed. The dual-mode light sensor (106) measures and computes the amount of external light and electrical light incident on its sensing surface. The individual measured light components (total light, electric light and external light) are transmitted to the window treatment controller (103) and the electric light controller (102). The controllers (102, 103) use this information to optimally control the lighting condition to meet user requirements and reduce energy consumption. Both controllers (102, 103) operate concurrently and independently, but are linked via the dual-mode sensor (106).
26 Citations
13 Claims
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1. A method of controlling light luminosity in a space including an installed light source and an external light source, comprising:
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measuring, using a first controller, individual light intensity components from the installed light source at a location within the space; measuring, using a second controller, individual light intensity components from the external light source at the location within the space; controlling automatically an intensity level of the installed light source and an amount of light from the external light source entering the space by using the first controller and the second controller, respectively, wherein the controlling of the intensity level is based on the measured light intensity components; and tuning automatically the intensity level of the installed light source and the amount of external light entering the space simultaneously by using the first controller and the second controller, respectively, in order to optimize a combined light intensity measured from said light sources as close to a pre-defined target luminance level at said location and minimize an amount of energy consumed by the installed light source, the first controller and the second controller being configured to execute independently and in parallel; wherein the tuning is performed by iteratively adjusting the intensity of the installed light source by a first adaptation step size and the amount of external light entering the space by a second adaptation step size, wherein the first and second adaptation step sizes depend on a difference between the pre-defined target luminance level and the combined light intensity measured, and on an energy consumption. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for controlling light luminosity in a space including an installed light source and an external light source, comprising:
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a sensor for measuring individual light intensity components from the installed light source and the external light source, respectively, at a location within the space, a first controller for automatically controlling an intensity level of the installed light source and a second controller for automatically controlling an amount of light from the external light source entering the space based on the measured light intensities, wherein the first controller and the second controller are each adapted to automatically tune the intensity level of the installed light source and the amount of external light entering the space simultaneously to optimize a combined light intensity measured from said light sources as close to a pre-defined target luminance level at said location and minimize an amount of energy consumed by the installed light source, the first controller and the second controller being configured to concurrently execute independently and in parallel; wherein the first controller is adapted to iteratively adjust the intensity of the installed light source by a first adaptation step size and the second controller is adapted to adjust the amount of external light entering the space by a second adaptation step size, wherein the first and second adaptation step sizes depend on a difference between the pre-defined target luminance level and the combined light intensity measured, and on an energy consumption. - View Dependent Claims (9, 10, 11, 12)
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13. A non-transitory computer readable medium having stored thereon instructions for causing a first processor and a second processor to perform a process of controlling light luminosity in a space including an installed light source and an external light source, the process comprising:
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measuring, using a first processor, individual light intensity components from the installed light source and the external light source, respectively, at a location within the space; measuring, using a second controller, individual light intensity components from the external light source; controlling automatically an intensity level of the installed light source and an amount of light from the external light source entering the space by using the first processor and the second processor, respectively, based on the measured light intensities; and tuning automatically the intensity level of the installed light source and the amount of external light entering the space simultaneously by using the first processor and the second processor, respectively, to optimize a combined light intensity measured from said light sources as close to a pre-defined target luminance level at said location and minimize an amount of energy consumed by the installed light source, the first controller and the second controller being configured to execute independently and in parallel; wherein the tuning is performed by iteratively adjusting the intensity of the installed light source by a first adaptation step size and the amount of external light entering the space by a second adaptation step size, wherein the first and second adaptation step sizes depend on a difference between the pre-defined target luminance level and the combined light intensity measured, and on an energy consumption.
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Specification