Method for measuring external light to control protection means against sunlight or illumination
First Claim
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1. A control process for measuring exterior light and controlling at least one motorized means of a solar protection and/or lighting means, said control process comprising the steps of:
- detecting at least three states, respectively blue sky, white sky and direct sun;
wherein a blue sky is a substantially homogeneous sky presenting low luminance and a white sky is a substantially homogeneous sky presenting high luminance;
discriminating at least said three states, andactivating said motorized means of said solar protection and/or lighting means according to the discriminated states.
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Abstract
The invention concerns a method which consists in detecting and discriminating at least three states, respectively blue sky, white sky and direct sunlight. The discrimination between the three states is based, for example, on an intermediate detection distinguishing between either a homogenous state or a nonhomogeneous state of the sky. White sky means a sky saturated with humidity, with strong light diffusion and producing a high level of brightness. The method can be implemented, for example by using sensors or a monochromatic or color camera.
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Citations
15 Claims
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1. A control process for measuring exterior light and controlling at least one motorized means of a solar protection and/or lighting means, said control process comprising the steps of:
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detecting at least three states, respectively blue sky, white sky and direct sun; wherein a blue sky is a substantially homogeneous sky presenting low luminance and a white sky is a substantially homogeneous sky presenting high luminance; discriminating at least said three states, and activating said motorized means of said solar protection and/or lighting means according to the discriminated states. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system, comprising:
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at least two sunlight sensors facing different directions from each other; a computation device receiving signals from the sensors and generating corresponding outputs to the sensors; and at least one comparator receiving the outputs and at least partially based thereon, outputting a signal representative of whether the sky is homogenous or nonhomogeneous, detecting at least three states, respectively blue sky, white sky and direct sun; wherein a blue sky is a substantially homogeneous sky presenting low luminance and a white sky is a substantially homogeneous sky presenting high luminance and discriminating at least said three states, and activating a motorized means of a solar protection and/or lighting means according to the discriminated states.
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Specification