JP5590401B2 - Blind control method - Google Patents

Description

  The present invention relates to a method for controlling a blind in a building.

  Conventionally, in a blind installed in a building, the angle of inclination of the slats is adjusted so that the sunlight reflected by the slats is directed toward the ceiling at the back of the room as the upper slats are directed toward the ceiling at the back of the window. There is a blind that is sequentially changed from a slat to a lower slat (see Patent Document 1).

  In addition, when a shield located around the opening of a window or the like blocks sunlight, the blind height and slat angle are adjusted to enable effective daylight use and improve occupant comfort. In addition, there is an electric blind that can be controlled to reduce lighting load, air conditioning load, and the like (see Patent Document 2).

JP-A-10-317850 JP 2000-54762 A

  However, the blind described in Patent Document 1 cannot control the slat angle according to the situation.

  In addition, the blind control described in Patent Document 2 is a control that takes into consideration a simple shape of a wrinkle or a wall.

  An object of the present invention is to solve the above-mentioned problems and to provide a blind control method for appropriately controlling a blind according to the surrounding conditions of the blind to be controlled.

The present invention solves the above problems,
In a blind control method for controlling the height of a blind and the angle of a slat according to solar radiation,
Store solar position data including information on the position of the sun, surrounding building data including information on the outer shape of the building around the blind, and awning shape data including information on the shape and dimensions of the awning around the blind. Steps,
Entering the current date and time;
Obtaining the position of the sun at the current date and time from the current date and time and the sun position data;
Obtaining an amount of solar radiation for the blind from the position of the sun;
Obtaining a shadow by the surrounding building for the blind from the position of the sun and the surrounding building data;
Obtaining a shade by the sunshade for the blind from the sun position and the sunshade shape data;
Controlling blinds and slats based on solar radiation for the blinds determined by obtaining shadows from the surrounding buildings and shades from the awnings;
I have a,
The surrounding building data includes information on the maximum elevation angle for each direction of the surrounding building around the position where the blind is located,
The step of obtaining a shadow by the surrounding building of the blind is
The shadow of the blind by the surrounding building is obtained by comparing the information on the maximum elevation angle for each direction of the surrounding building around the position where the blind is located and the position of the sun. And

  In addition, the method includes a step of calculating carbon dioxide emissions of air conditioning and lighting, and a step of controlling blinds and slats according to the carbon dioxide emissions.

  The awning shape data includes information on a position and a size of at least one of a heel, a sleeve wall, and a shade, and the step of obtaining a shadow by the awning of the blind includes the sun for an area with the blind. The position is obtained by comparing with the shape of the awning.

The present invention solves the above problems,
In a blind control method for controlling the height of a blind and the angle of a slat according to solar radiation,
Store solar position data including information on the position of the sun, surrounding building data including information on the outer shape of the building around the blind, and awning shape data including information on the shape and dimensions of the awning around the blind. Steps,
Entering the current date and time;
Obtaining the position of the sun at the current date and time from the current date and time and the sun position data;
Obtaining an amount of solar radiation for the blind from the position of the sun;
Obtaining a shadow by the surrounding building for the blind from the position of the sun and the surrounding building data;
Obtaining a shade by the sunshade for the blind from the sun position and the sunshade shape data;
Controlling blinds and slats based on solar radiation for the blinds determined by obtaining shadows from the surrounding buildings and shades from the awnings;
I have a,
The surrounding building data includes information on the maximum elevation angle for each direction of the surrounding building around the position where the blind is located,
The step of obtaining a shadow by the surrounding building of the blind is
Since the shadow of the blind by the surrounding building is obtained by comparing the information on the maximum elevation angle for each direction of the surrounding building with the position of the blind as the center and the position of the sun , the blind which is the control target The blinds can be appropriately controlled according to the surrounding buildings, the shape of the surrounding awnings, and the solar radiation incident on the blinds.

  In addition, since the method includes a step of calculating carbon dioxide emissions of air conditioning and lighting, and a step of controlling blinds and slats according to the carbon dioxide emissions, the environment is set to reduce carbon dioxide emissions. It is possible to control in consideration.

  The awning shape data includes information on a position and a size of at least one of a heel, a sleeve wall, and a shade, and the step of obtaining a shadow by the awning of the blind includes the sun for an area with the blind. Since the position and the shape of the awning are compared and acquired, the blind can be controlled more appropriately.

It is a figure which shows the state which installed the blind of this embodiment in the building. It is the figure which expanded a part of blind of this embodiment. It is a block diagram of blind control of this embodiment. It is a figure which shows surrounding building data. It is a figure which shows the building in which the sunshade was formed around the window. It is a figure which shows the window which has a ridge. It is a figure which shows the window which has a sleeve wall. It is a figure which shows the window which has a shade. FIG. 4 shows a window having a shade with an opening. It is a figure which shows sunlight introduction mode. It is a figure which shows the state of the blind in sunlight introduction mode. It is a figure which shows the state of the blind in fully closed mode. It is a figure which shows the state of the blind in 1st Embodiment of view mode. It is a figure which shows the state of the blind in 2nd Embodiment of view mode. It is a figure which shows the state of the blind in winding-up mode. It is a figure which shows a carbon dioxide emission calculation part. It is a flowchart figure of the blind control of this embodiment. It is a flowchart figure which shows the subroutine which acquires the shadow by the surrounding building with respect to the window which has the blind used as control object. It is a figure which shows surrounding building data and the orbit of the sun. It is a flowchart figure which shows the subroutine which acquires the shadow by the sunshade around the window which has the blind used as control object.

  Hereinafter, an embodiment of blind control according to the present invention will be described with reference to the drawings.

  Drawing 1 is a figure showing the state where blind 1 of this embodiment was installed in a building. The blind 1 of this embodiment is suspended from the ceiling 2 toward the floor 3 adjacent to the inside of the window 2. The blind 1 can be manually or automatically changed in height, that is, the distance of the lower end 1a from the ceiling. When not in use, all the blinds 1 can be pulled up to the ceiling 2 side. Note that the blind control of the present embodiment can be applied to a general blind 1.

  FIG. 2 is an enlarged view of a part of the blind according to the present embodiment. The blind 1 has a large number of slats 11 arranged at intervals in the vertical direction. The slat 11 can adjust the slat angle θ manually or automatically according to the situation.

  FIG. 3 is a block diagram of blind control according to the present embodiment.

  The blind control according to the present embodiment includes an input unit 21 for inputting parameters such as date and time and amount of solar radiation, a storage unit 22 for storing solar position data, surrounding building data, sunshade shape data, and the like. A control unit 31 that inputs various parameters from the unit 21 and inputs various data from the storage unit 22, and a blind drive unit 41 that drives the entire blind by a signal output from the control unit 31 and changes the height of the blind 1. And a stat drive unit 42 that changes the angle of the slat 11 according to a signal output from the control unit 31.

  The input unit 21 acquires the date and time from a clock or the like built in the apparatus, acquires the diffuse solar radiation amount and direct solar radiation amount at the time of control from the solar radiation amount sensor, and transmits them to the control unit 31.

  As a solar radiation amount sensor, there are a method using a solar tracking type solar radiation meter or a method using a plurality of solar radiation meters. The solar tracking solar radiation meter directly measures direct light and acquires diffuse solar radiation amount and direct solar radiation amount. When a plurality of solar radiation systems are used, the direct solar radiation amount is obtained from the vertical plane solar radiation measurement value by a calculation formula, and the diffuse solar radiation amount is obtained from the difference between the horizontal solar radiation amount and the direct solar radiation amount.

  The storage unit 22 includes latitude and longitude data of the blind position of the building to be controlled, solar position data storing the azimuth and altitude of the sun for each date and time, and the height and shape of the building around the blind to be controlled. And the like, and the awning shape data storing the shape of the awning such as ridges, sleeve walls and shades formed around the window having the blind to be controlled. The solar position data may be obtained by calculation from the date and time.

  FIG. 4 is a diagram showing surrounding building data. As shown in FIG. 4, the surrounding building data is obtained by inputting information on the maximum elevation angle for each direction of the surrounding building B around the position where the blind to be controlled is located. For example, the data of the surrounding building B is obtained from the elevation angle and the azimuth of the portion of the building boundary that occupies the sky for each blind place to be controlled.

  FIG. 5 is a view showing a building in which a sunshade is formed around the window, and FIGS. 6 to 9 are enlarged views of a part of FIG.

The awning shape data stores the shape and dimensions of the awning formed around the window having the blind that is the object of the building. For example, the region W _{13 in} FIG. 5 has a ridge 61 above the window 2 as shown in FIG. The region W ₃₂ in FIG. 5 has a return panel 62 on the side of the window 2, as shown in FIG. Further, the region W _{11 in} FIG. 5 has a shade 63 in front of the window 2 as shown in FIG. Further, the region W _{23 in} FIG. 5 has a shade 63 having an opening 64 in front of the window 2 as shown in FIG.

  FIG. 6 is a diagram showing a awning type awning. The dimensions to be stored are the distance between the blind 1 and the window 2, the position, height, and width of the window 2 with respect to the region W, and the position, protrusion length, and width of the flange 61 with respect to the region W.

  FIG. 7 is a diagram showing a sleeve wall type awning. The dimensions to be stored are the distance between the blind 1 and the window 2, the position, height and width of the window 2 with respect to the region W, and the position, protruding length and height of the sleeve wall 62 with respect to the region W.

  FIG. 8 is a diagram showing shade type awnings. The dimensions to be stored are the distance between the blind 1 and the window 2, the position, height, and width of the window 2 with respect to the area W, and the position, height, and width of the shade 63 with respect to the area W.

  FIG. 9 is a view showing an opening shade type awning. The dimensions to be stored are the distance between the blind 1 and the window 2, the position, height and width of the window 2 relative to the area W, the position, height and width of the shade 63 relative to the area W, and the position of the opening 64 relative to the area W. Height and width.

  A type having a plurality of front shades may also be used. Moreover, the type which each combined the collar 61, the sleeve 62 wall, the shade 63, etc. may be sufficient.

  Since these dimensions are determined at the time of building design, they are stored in advance for each control area.

  The control unit 31 acquires the position of the sun based on the date and time acquired from the input unit 21 from the storage unit 22, and the surrounding building and the awning shape according to the solar radiation at the time of control acquired from the input unit 21 and the position of the sun. To calculate the state of the shadow that can be formed in the window. Based on the calculated solar radiation and shadow, the control unit 31 transmits a drive signal to the blind drive unit 41 and the slat drive unit 42. The blind drive unit 41 drives based on the signal transmitted from the control unit 31 until the blind 1 reaches a predetermined height. Moreover, the slat drive part 42 drives based on the signal which the control part 31 transmitted until the angle of the slat 11 becomes a predetermined angle.

  Next, the blind control of this embodiment will be described.

  First, before explaining the flowchart, each control mode for setting the state of the blind 1 among the processes in the flowchart will be explained. In the blind control of the present embodiment, the blind is controlled to any one of the sunlight introduction mode, the fully closed mode, the view mode, and the winding mode.

  FIG. 10 is a diagram showing the sunlight introduction mode, and FIG. 11 is a diagram showing slats in the sunlight introduction mode.

  In the sunlight introduction mode, as shown in FIG. 10, the sunlight rays L reach the ceiling surface at the back of the room through the blind 1. For this purpose, the angle of each slat 11 is controlled as shown in FIG. The angle of the slat 11 is calculated by the control unit 31 based on the input from the input unit 21 and the data in the storage unit 22.

  FIG. 12 is a view showing a slat in the fully closed mode.

  In the fully closed mode, the angles of all the slats 11 of the blind 1 are controlled to 90 ° so that sunlight does not enter the room.

  FIG. 13 is a view showing slats in the view mode of the first embodiment, and FIG. 14 is a view showing slats in the view mode of the second embodiment.

  In the view mode, the slat angle is controlled so that the view from outside the room is secured. For example, as in the first embodiment shown in FIG. 13, the angles of all the slats 11 of the blind 1 are set to 0 °. Further, as in the second embodiment shown in FIG. 14, when the pupil E is at a predetermined position, the angle of each slat 11 may be set so that a view outside the window can be secured.

  Further, as shown in FIG. 15, the hoisting mode is control for hoisting the blind 1 to the ceiling side, and may be set as one of the view modes.

  Next, calculation of carbon dioxide emission will be described in the processing in the flowchart. FIG. 16 is a diagram illustrating a carbon dioxide emission amount calculation unit.

  First, the angle of the slat 11 of the blind 1 when the control mode is controlled as described with reference to FIGS. Further, the azimuth and altitude of the sun are obtained from the storage unit 22, the solar radiation amount and the solar radiation projection area calculated by the control unit 31 are obtained from the input unit 21.

  Then, in pre-step 1, the daylight illuminance at the light control point is obtained from each acquired information (PST1), and in pre-step 2, the energy consumption by the illumination to be used is obtained (PST2). Thereafter, in pre-step 3, the amount of carbon dioxide emitted by lighting is calculated from the energy consumed by lighting (PST3).

  In parallel, in pre-step 4, the amount of heat acquired from the window surface is obtained from each acquired information (PST4). In pre-step 5, the amount of heat generated by illumination is obtained from the energy consumed by illumination (PST5). Next, in pre-step 6, the energy consumed by air conditioning is obtained from the amount of heat acquired from the window surface and the amount of heat generated by illumination (PST6). Thereafter, carbon dioxide emissions by air conditioning are calculated in pre-step 7 (PST7).

  Finally, in pre-step 8, the total carbon dioxide emission is obtained from the carbon dioxide emission due to lighting and the carbon dioxide emission due to air conditioning (PST8).

  Next, the flowchart of the blind control of this embodiment will be described.

  FIG. 17 is a flowchart of blind control according to this embodiment.

  In addition, before starting control, the memory | storage part 22 shown in FIG. 3 memorize | stores solar position data, surrounding building data, awning shape data, etc. previously.

  First, in step 1, the date and time are input (ST1).

  In step 2, it is determined whether or not the control date and time input from the input unit 21 is night or holiday (ST2).

  In step 2, when it is night or holiday, in step 3, the control unit 31 calculates carbon dioxide emissions in the fully closed mode and the view mode, respectively (ST3).

  Subsequently, in step 4, it is determined whether or not the carbon dioxide emission amount in the fully closed mode calculated in step 3 is larger than the carbon dioxide emission amount in the view mode (ST4).

  In Step 4, when the carbon dioxide emission amount in the fully closed mode is larger than the carbon dioxide emission amount in the view mode, in Step 5, the view mode or the winding mode is set, and the blind drive unit 41 and the slat drive unit 42 are controlled. The blind 1 and the slat 11 are controlled as shown in FIG. 13, FIG. 14, or FIG. 15 (ST5), and the process ends.

  In Step 4, when the carbon dioxide emission amount in the fully closed mode is smaller than the carbon dioxide emission amount in the view mode, the blind driving unit 41 and the slat driving unit 42 are controlled in Step 6 by controlling the blind driving unit 41 and the slat driving unit 42, as shown in FIG. The blind 1 and the slat 11 are controlled as described above (ST6), and the process ends.

  In step 2, when it is not night or holiday, in step 7, the solar radiation amount is obtained from the solar position data in the storage unit 22, the sun position calculated from the date and time, or the solar radiation sensor of the input unit 21. (ST7).

  Next, in step 8, based on the information in the input unit 21 and the storage unit 22, a subroutine is executed to acquire a shadow from the surrounding building on the window having the blind to be controlled (ST8).

  FIG. 18 is a flowchart illustrating a subroutine for acquiring a shadow of a surrounding building with respect to a window having a blind to be controlled.

  First, in step 81, the date and time is obtained from the input unit 21 (ST81). Subsequently, in step 82, positions such as the azimuth angle and altitude of the sun are acquired from the input unit 21 (ST82). Next, in step 83, data on the maximum elevation angle of the surrounding building shown in FIG. 4 is acquired from the storage unit 22 (ST83).

  Next, in step 84, a shadow by a surrounding building is acquired for a window having a blind to be controlled (ST84). Thereafter, the routine returns to the normal routine shown in FIG.

  FIG. 19 is a diagram showing surrounding building data and the sun's trajectory. As shown in FIG. 19, the surrounding building data is obtained by inputting information on the maximum elevation angle for each direction of the surrounding building B around the position where the blind is located. For example, the data of the surrounding building B is obtained from the elevation angle and the azimuth of the portion of the building boundary that occupies the sky for each position where the blind to be controlled is present.

  In FIG. 19, S indicates the orbit of the sun on a predetermined day. And in the location where the solar orbit 50 and the building B overlap, it has shown that the shadow of the building B has generate | occur | produced in the place with the blind used as control object. For example, in FIG. 19, a solid line 52 that does not overlap with the range of the building B in the sun's orbit 50 directly hits a place where there is a blind subject to control and the solar radiation overlaps with the range of the building B. It can be seen that in the dotted line portion 51 and the dotted line portion 53, the shadow of the building B is formed at the place where the blind to be controlled is present.

  Next, in step 9, it is determined whether solar radiation enters a window having a blind to be controlled as a result of step 7 (ST9).

  If it is determined in step 9 that solar radiation enters a window having a blind to be controlled, a subroutine for acquiring a shadow by an awning is executed based on information in the input unit 21 and the storage unit 22 in step 9 (ST10). .

  FIG. 20 is a flowchart showing a subroutine for acquiring a shadow due to an awning around a window having a blind to be controlled.

  The solar radiation projection area and the distance h from the ceiling shown in FIG. 10 to the highest solar radiation position vary depending on the azimuth angle and altitude of the sun according to the date and time. Moreover, the solar radiation projection area and the distance h from the ceiling shown in FIG. 11 to the solar radiation top position also change by the sunshade shown in FIGS. In this subroutine, the projection area of the solar radiation for the window having the blind to be controlled and the distance h from the ceiling to the top position of the solar radiation are acquired by the influence of the sun position and the sunshade according to the date and time. The result obtained in the subroutine of Step 9 is used for controlling the slat angle in the normal routine.

  First, in step 101, the date and time is acquired from the input unit 21 (ST101). In step 102, the azimuth angle and altitude of the sun are acquired from the input unit 21 (ST102). Next, in step 103, the awning shape data shown in FIGS. 5 to 9 is acquired from the storage unit 22 (ST103).

  Next, in step 104, a shadow by an awning is acquired for a window having a blind to be controlled (ST104). Subsequently, in step 95, the solar radiation projection area for the window having the blind to be controlled and the distance h from the ceiling shown in FIG. 10 to the solar radiation top position are acquired (ST105). Thereafter, the routine returns to the normal routine shown in FIG.

  Next, in step 11, it is determined whether the amount of solar radiation with respect to the window having the blind to be controlled is larger than a predetermined threshold (ST11).

  If it is determined in step 11 that the amount of solar radiation with respect to the window having the blind to be controlled is larger than a predetermined threshold value, the control unit 31 determines the angle of each slat 11 of the blind 1 in the sunlight introduction mode in step 12. Each is calculated (ST12).

  Next, in step 13, the control unit 21 calculates the carbon dioxide emission amounts in the sunlight introduction mode and the fully closed mode by the carbon dioxide emission amount calculation unit shown in FIG. 16 (ST13).

  Subsequently, in step 14, it is determined whether or not the carbon dioxide emission amount in the fully closed mode calculated in step 12 is larger than the carbon dioxide emission amount in the sunlight introduction mode mode (ST14).

  If the carbon dioxide emission amount in the fully closed mode is larger than the carbon dioxide emission amount in the sunlight introduction mode in step 14, the sunlight introduction mode is set in step 15, and the blind drive unit 41 and the slat drive unit 42 are controlled. As shown in FIGS. 10 and 11, the blind 1 and the slat 11 are controlled to the angle calculated in step 10 (ST15), and the process ends.

  In Step 14, when the carbon dioxide emission amount in the fully closed mode is smaller than the carbon dioxide emission amount in the solar light introduction mode, in Step 16, the blind drive unit 41 and the slat drive unit 42 are controlled, As shown in FIG. 12, the blind 1 and the slat 11 are controlled (ST16), and the process ends.

  When it is determined in step 9 that the solar radiation does not enter the window having the blind to be controlled, and when the solar radiation amount for the window having the blind to be controlled is determined to be less than the predetermined threshold in step 10 In step 17, as shown in FIG. 16, the control unit 31 calculates carbon dioxide emissions in the fully closed mode and the view mode, respectively (ST17).

  Subsequently, in step 18, it is determined whether or not the carbon dioxide emission amount in the fully closed mode calculated in step 17 is larger than the carbon dioxide emission amount in the view mode (ST18).

  In step 18, when the carbon dioxide emission amount in the fully closed mode is larger than the carbon dioxide emission amount in the view mode, in step 19, the view mode or the winding mode is set, and the blind drive unit 41 and the slat drive unit 42 are controlled, The blind 1 and the slat 11 are controlled as shown in FIG. 13, FIG. 14, or FIG. 15 (ST19), and the process is terminated.

  If the carbon dioxide emission amount in the fully closed mode is smaller than the carbon dioxide emission amount in the view mode in step 18, the fully closed mode is set in step 20, and the blind driving unit 41 and the slat driving unit 42 are controlled, as shown in FIG. The blind 1 and the slat 11 are controlled as described above (ST20), and the process ends.

  As described above, according to the present embodiment, in the blind control method for controlling the height of the blind 1 and the angle of the slat 11 according to the solar radiation, the solar position data including the information of the sun position, the building around the blind 1 Storing peripheral building data including information on the outer shape of the object B, and awning shape data including information on the shape and dimensions of the awning around the blind 1, a step of inputting the current date and time, and a current date and time; The step of acquiring the position of the sun at the current date and time from the sun position data, the step of acquiring the amount of solar radiation for the blind 1 from the position of the sun, and the shadow of the surrounding building B on the blind from the position of the sun and the surrounding building data A step of acquiring, a step of acquiring a shade by a sunshade for the blind 1 from the sun position and the sunshade shape data; And the step of controlling the blind 1 and the slat 11 on the basis of the solar radiation with respect to the blind 1 obtained by acquiring the shadow by the side building B and the shadow by the sunshade, so that the buildings around the blind 1 to be controlled It becomes possible to control the blind 1 appropriately according to the shape of B, the shape of the surrounding sunshade, and the solar radiation incident on the blind 1.

  Moreover, since it has the step which calculates the discharge | emission amount of the carbon dioxide of an air conditioning and lighting, and the step which controls the blind 1 and the slat 11 according to the discharge | emission amount of a carbon dioxide, it is environment so that a carbon dioxide emission amount may be decreased. Can be controlled.

  The surrounding building data includes information on the maximum elevation angle for each direction of the surrounding building B around the position where the blind 1 is located, and the step of acquiring the shadow by the surrounding building B of the blind 1 Since the shadow of the surrounding building B of the blind 1 is acquired by comparing the information of the maximum elevation angle for each direction of the surrounding building B around a certain position and the position of the sun, the blind 1 is controlled more appropriately. Is possible.

  The shade shape data includes information on the position and size of at least one of the heel 61, the sleeve wall 62, and the shade 63, and the step of acquiring a shadow due to the shade of the blind 1 Since the position and the shape of the awning are compared and acquired, the blind 1 can be controlled more appropriately.

 DESCRIPTION OF SYMBOLS 1 ... Blind, 2 ... Window, 3 ... Ceiling, 4 ... Floor, 11 ... Slat, 21 ... Input part, 22 ... Memory | storage part, 31 ... Control part, 41 ... Blind drive part, 42 ... Slat drive part, 61 ... 庇62 ... Sleeve wall, 63 ... Shade, 64 ... Opening

Claims (3)

In a blind control method for controlling the height of a blind and the angle of a slat according to solar radiation,
Store solar position data including information on the position of the sun, surrounding building data including information on the outer shape of the building around the blind, and awning shape data including information on the shape and dimensions of the awning around the blind. Steps,
Entering the current date and time;
Obtaining the position of the sun at the current date and time from the current date and time and the sun position data;
Obtaining an amount of solar radiation for the blind from the position of the sun;
Obtaining a shadow by the surrounding building for the blind from the position of the sun and the surrounding building data;
Obtaining a shade by the sunshade for the blind from the sun position and the sunshade shape data;
Controlling blinds and slats based on solar radiation for the blinds determined by obtaining shadows from the surrounding buildings and shades from the awnings;
I have a,
The surrounding building data includes information on the maximum elevation angle for each direction of the surrounding building around the position where the blind is located,
The step of obtaining a shadow by the surrounding building of the blind is
The shadow of the blind by the surrounding building is obtained by comparing the information on the maximum elevation angle for each direction of the surrounding building around the position where the blind is located and the position of the sun. And blind control method. Calculating carbon dioxide emissions for air conditioning and lighting;
Controlling blinds and slats according to the carbon dioxide emissions;
The blind control method according to claim 1, further comprising:
The blind control method according to claim 1 , wherein: The awning shape data includes information on the position and dimensions of at least one of a heel, a sleeve wall, or a shade,
The step of obtaining a shadow by the shade of the blind is
The blind control method according to claim 1 or 2 , wherein the position of the sun with respect to an area where the blind is located is compared with the shape of the shade.

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