JP7019371B2 - Lighting control system - Google Patents

Description

The present invention relates to a lighting control system that controls indoor lighting.

Conventionally, at least one sensor used for lighting control is installed in one lighting area. Therefore, the same number of sensors as in the illuminated area is needed. Further, in the conventional sensor, the reflected light of solar radiation may be directly incident (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-85934 "Study on preferred brightness contrast between window surface and wall surface in daylight use Part 4 Handling of window surface brightness when using blinds", Mika Kato, 4 outsiders, Architectural Institute of Japan Conference Academic Lecture Summary, pp.563- 564, 2014

An object of the present invention is to provide a lighting control system capable of accurately controlling the dimming rate of lighting.

The lighting system according to the present invention is
Lighting installed in the room and
One luminance camera that detects the luminance of the measurement point set in the room, and
The brightness due to daylight is calculated from the difference between the brightness of the measurement point detected by the brightness camera and the brightness of the measurement point due to the current lighting, and is based on the difference between the target brightness of the measurement point and the brightness due to the daylight. A control unit that controls the dimming rate of the lighting,
Equipped with
The control unit calculates the target brightness of the measurement point from the current value of the window surface brightness detected by the brightness camera .
The control unit calculates the target brightness of the measurement point from the window surface brightness detected by the brightness camera by the following equation (B).
It is characterized by that.
log ₁₀ (y) = a ₁ log ₁₀ (x) ＋ a ₂ log ₁₀ ρ ＋ a ₃ ω ＋ a ₄ (B)
However,
y: Target brightness at the measurement point,
x: Current value of window brightness,
ρ: Reflectance on the desk surface,
ω: Solid angle of the window,
Is.
Further, a ₁ , a ₂ , a ₃ , and a ₄ satisfy the following conditions.
0.6 <a ₁ <0.9
0.8 <a ₂ <1.2
0.2 <a ₃ <0.4
0 ≤ a ₄

In the lighting system according to the present invention,
When the difference between the target brightness of the measurement point and the brightness due to the daylight is larger than 0, the control unit calculates the dimming rate from the following equation (A).
It is characterized by that.
V = (HL-D1) / D2 (A)
However,
V: Lighting dimming rate,
HL: Luminance to be supplemented (difference between the target luminance at the measurement point and the luminance due to the daylight),
D1: First illumination coefficient,
D2: 2nd lighting factor,
Is.

In the lighting system according to the present invention,
The lighting is divided into a plurality of areas in the room and installed.
The control unit controls the dimming rate of the lighting for each of the plurality of areas.
It is characterized by that.

In the lighting system according to the present invention,
The brightness camera detects the brightness of at least a part of the desk surface in the room.
The control unit controls the dimming rate of the lighting based on the illuminance acquired from the brightness of the desk surface.
It is characterized by that.

According to the lighting control system according to the present invention, it is possible to accurately control the dimming rate of lighting.

An example of an indoor structure using the lighting control system of the present embodiment is shown. The II-II cross section of FIG. 1 is shown. The control flowchart of the lighting control system of this embodiment is shown. The flowchart of the wall lighting dimming rate calculation is shown. The flowchart of the first wall lighting dimming rate calculation is shown. The flowchart of the second wall lighting dimming rate calculation is shown. The flowchart of the ceiling lighting dimming rate calculation is shown.

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

FIG. 1 shows an example of an indoor structure using the lighting control system of the present embodiment. FIG. 2 shows a cross section of FIG. 1 II-II.

The lighting control system of the present embodiment is used in a predetermined indoor room 1 such as an office as shown in FIG. Room 1 is surrounded by a wall surface 2, a ceiling surface 3, a window surface 5, and a floor 6. A wall lighting 32 and a ceiling lighting 33 are installed on the ceiling 3. The wall lighting 32 is installed on the wall surface side of the ceiling 3.

The brightness camera 10 of the present embodiment has a wall surface measurement point 22 in the wall surface vicinity region 12, a ceiling surface measurement point 23 in the ceiling surface vicinity region 13, a desk surface measurement point 24 in the desk surface vicinity region 14, and a window in the window surface vicinity region 15. The brightness of the surface measurement point 25 is acquired. The luminance camera 10 of the present embodiment is suspended from the ceiling surface 3 so that at least a part of each surface of the wall surface 2, the ceiling surface 3, the desk top surface 4, and the window surface 5 is in the field of view. The mounting structure of the brightness camera 10 is not limited to this example, and any mounting structure may be used as long as the brightness of a predetermined surface can be obtained.

The wall surface vicinity region 12 includes the wall surface 2 on the side where the wall lighting 32 is installed and the vicinity of the wall surface 2. That is, it includes a region where the brightness changes by controlling the wall lighting 32. The wall surface measurement point 22 may be set at a predetermined position in the wall surface vicinity region 12. A plurality of wall surface measurement points 22 may be set from the side closer to the window surface 5.

The ceiling surface vicinity region 13 includes the ceiling surface 3 and the vicinity of the ceiling surface 3. That is, it includes a region where the brightness changes by controlling the ceiling lighting 33. The ceiling surface measurement point 23 may be set at a predetermined position in the area near the ceiling surface 13. Further, a plurality of ceiling surface vicinity regions 13 may be set in one room 1. In this embodiment, the area near the first ceiling surface 131, the area near the second ceiling surface 132, and the area near the third ceiling surface 133 are set from the side closer to the window surface 5. In this embodiment, the first ceiling surface measurement point 231 and the first ceiling illumination 331 are in the first ceiling surface vicinity region 131, and the second ceiling surface measurement point 232 and the second ceiling illumination 332 are in the second ceiling surface vicinity region 132. , The third ceiling surface measurement point 233 and the third ceiling illumination 333 are set in the region near the third ceiling surface 133, respectively.

By setting a plurality of measurement points from the side closer to the window surface 5 as in the present embodiment, it is possible to consider the influence of external light corresponding to each point, and to control the lighting more accurately. It becomes possible to do.

The desk surface vicinity region 14 includes the desk surface surface 4 and the vicinity of the desk surface surface 4. That is, it includes a region where the brightness changes by controlling the ceiling lighting 33. The desk surface measurement point 24 may be set at a predetermined position in the region near the desk surface 14. Further, a plurality of desk surface vicinity regions 14 may be set in one room 1. In this embodiment, the area near the upper surface of the first desk, the area 142 near the upper surface of the second desk, and the area near the upper surface of the third desk 143 are set from the side closer to the window surface 5. In this embodiment, the first desk upper surface measurement point 241 is in the first desk upper surface vicinity region 141, the second desk upper surface measurement point 242 is in the second desk upper surface vicinity region 142, and the third desk is in the third desk upper surface vicinity region 143. The top surface measurement points 243 are set respectively.

By setting a plurality of measurement points from the side closer to the window surface 5 as in the present embodiment, it is possible to consider the influence of external light corresponding to each point, and to control the lighting more accurately. It becomes possible to do.

The window surface neighborhood region 15 includes the window surface 5 and the vicinity of the window surface 5. That is, it includes a region where the brightness changes by controlling the ceiling lighting 33. The window surface measurement point 25 may be set at a predetermined position in the window surface vicinity region 15.

The dimming rate of the wall lighting 32 is controlled by the brightness measured at the wall surface measuring point 22. The dimming rate of the first ceiling illumination 331 is controlled by the brightness measured at the first ceiling surface measurement point 231 and the first desk surface measurement point 241 and the window surface measurement point 25. The dimming rate of the second ceiling illumination 332 is controlled by the brightness measured at the second ceiling surface measurement point 232 and the second desk surface measurement point 242. The dimming rate of the third ceiling illumination 333 is controlled by the brightness measured at the third ceiling surface measurement point 233 and the third desk surface measurement point 243.

Next, a control method of the lighting control system of the present embodiment will be described.

FIG. 3 shows a control flowchart of the lighting control system of the present embodiment.

The lighting control system of the present embodiment includes a control unit (not shown), and the control unit includes the brightness values of the wall surface measurement point 22, the ceiling surface measurement point 23, and the window surface measurement point 25 acquired by the luminance camera 10, and the desk surface. The dimming rate of the wall lighting 32 and the ceiling lighting 33 is controlled by inputting the illuminance value of the measurement point 24. Although the blind 51 is installed in the area near the window surface of the present embodiment, the control of the blind 51 is not considered in the present embodiment.

First, in step 1, the control unit reads the luminance reference area setting file (ST1). In step 1 of the illumination control system of the present embodiment, a measurement point is set as to which part of the image acquired from the luminance camera 10 is acquired. The measurement points of the present embodiment are the wall surface measurement point 22, the ceiling surface measurement point 23, the desk surface measurement point 24, and the window surface measurement point 25 shown in FIGS. 1 and 2. A plurality of luminance measurement points may be set on one surface.

Subsequently, in step 2, the control unit reads the luminance file (ST2). In step 2 of the lighting control system of the present embodiment, the brightness of the wall surface measurement point 22, the ceiling surface measurement point 23, the desk surface measurement point 24, and the window surface measurement point 25 is acquired from the image acquired from the luminance camera 10. When a plurality of luminance measurement points are set on one surface, the average value or the maximum value of the plurality of measurement points may be used as the luminance of the surface.

Next, in step 3, the wall lighting dimming rate is calculated (ST3).

Here, the calculation of the wall lighting dimming rate will be described.

FIG. 4 shows a flowchart of wall lighting dimming rate calculation.

First, in step 11, it is determined whether or not the first wall illumination dimming rate calculation for the brightness feeling of the wall surface brightness is ON (ST11). When the first wall lighting dimming rate calculation is ON in step 11, the first wall lighting dimming rate calculation is executed in step 12 (ST12). The details of the first wall lighting dimming rate calculation will be described later. When the first wall lighting dimming rate calculation is OFF in step 11, the first wall lighting dimming rate is temporarily stored as 0 in step 13 (ST13).

Next, in step 14, it is determined whether or not the second wall illumination dimming rate calculation for the wall brightness is ON (ST14). When the second wall lighting dimming rate calculation is ON in step 14, the second wall lighting dimming rate calculation is executed in step 15 (ST15). The details of the second wall lighting dimming rate calculation will be described later. When the second wall lighting dimming rate calculation is OFF in step 14, the second wall lighting dimming rate is temporarily stored as 0 in step 16 (ST16).

Here, the first wall lighting dimming rate calculation and the second wall lighting dimming rate calculation will be described. First, the first wall lighting dimming rate calculation control will be described.

FIG. 5 shows a flowchart of the first wall lighting dimming rate calculation.

First, in step 21, the current wall brightness is acquired from the brightness file (ST21). The current wall brightness is acquired from the brightness file read in step 2.

Next, in step 22, the wall surface brightness is calculated by the 75% allowable line formula (ST22). For the 75% permissible line formula, for example, an index such as the following formula (1) described in Non-Patent Document 1 may be used.
log ₁₀ (y) = a ₁ log ₁₀ (x) ＋ a ₂ log ₁₀ ρ ＋ a ₃ ω ＋ a ₄ (1)
However,
y: wall brightness,
x: Current value of window brightness,
ρ: Reflectance on the desk surface,
ω: Solid angle of the window,
Is.
Further, a ₁ , a ₂ , a ₃ , and a ₄ satisfy the following conditions.
0.6 <a ₁ <0.9
0.8 <a ₂ <1.2
0.2 <a ₃ <0.4
0 ≤ a ₄

Next, in step 23, the current wall lighting dimming rate is acquired (ST23). The current wall lighting dimming rate is obtained from a file that stores the previously determined dimming rate.

Subsequently, in step 24, the wall brightness due to the current lighting is calculated (ST24). The wall brightness due to the current lighting is calculated from the following equation (2).
Lwln = Dwl2 × Vwln + Dwl1 (2)
However,
Lwln: Wall brightness due to current lighting,
Dwl1: 1st wall illumination factor,
Dwl2: 2nd wall lighting factor,
Vwln: Current wall lighting dimming rate,
Is.
Here, the first illumination coefficient and the second illumination coefficient are constants representing the linear relationship between the dimming rate and the brightness. For example, when the equation (2) is shown in a graph, the first wall illumination coefficient represents the intercept and the second wall illumination coefficient represents the slope.

Next, in step 25, the wall brightness due to the current daylight is calculated (ST25). The current brightness due to daylight is calculated from the following equation (3).
DLwln = Mwln-Lwln (3)
However,
DLwln: Wall brightness due to current daylight,
Mwln: Current wall brightness,
Lwln: Wall brightness due to current lighting,
Is.

Next, in step 26, the wall brightness supplemented by lighting is calculated (ST26). The wall brightness to be supplemented is calculated from the following equation (4).
HLwl = y-DLwln (4)
However,
HLwl: Wall brightness to be supplemented,
y: wall brightness,
DLwln: Wall brightness due to current daylight,
Is.

Next, in step 27, the first wall lighting dimming rate is calculated from the following equation (5) (ST27).
Vwl1 = (HLwl-Dwl1) / Dwl2 (5)
However,
Vwl1: 1st wall lighting dimming rate,
HLwl: Wall brightness to be supplemented,
Dwl1: 1st wall illumination factor,
Dwl2: 2nd wall lighting factor,
Is.
Here, the first illumination coefficient and the second illumination coefficient are constants representing the linear relationship between the dimming rate and the brightness.

Next, in step 28, it is determined whether or not the dimming rate of the first wall illumination is greater than 0 and less than 100% (ST28).

In step 28, when the first wall lighting dimming rate is larger than 0 and smaller than 100%, in step 29, the current wall lighting dimming rate is changed to the first wall lighting dimming rate as shown in the following equation (6). (ST29).
Vwl1 = Vwln (6)
However,
Vwl1: 1st wall lighting dimming rate,
Vwln: Current wall lighting dimming rate,
Is.

In step 28, when the dimming rate of the first wall illumination is larger than 0 and not less than 100%, it is determined in step 30 whether or not the wall brightness to be supplemented by the illumination is 0 or less (ST30).

When the wall brightness to be supplemented is 0 or less in step 30, the first wall illumination dimming rate is set to 0 in step 31 (ST31). In step 30, when the wall brightness to be supplemented is 0 or more, the first wall illumination dimming rate is set to 100% in step 32 (ST31).

Next, the second wall lighting dimming rate calculation control will be described.

FIG. 6 shows a flowchart of the second wall lighting dimming rate calculation.

First, in step 41, the current wall brightness is acquired from the brightness file (ST41). The current wall brightness is acquired from the brightness file read in step 2.

Next, in step 42, the current wall lighting dimming rate is acquired (ST42). The current wall lighting dimming rate is obtained from a file that stores the previously determined dimming rate.

Subsequently, in step 43, the wall brightness due to the current lighting is calculated (ST43). The wall brightness is calculated from the following equation (2).
Lwln = Dwl2 × Vwln + Dwl1 (2)
However,
Lwln: Wall brightness due to current lighting,
Dwl1: 1st wall illumination factor,
Dwl2: 2nd wall lighting factor,
Vwln: Current wall lighting dimming rate,
Is.
Here, the first illumination coefficient and the second illumination coefficient are constants representing the linear relationship between the dimming rate and the brightness.

Next, in step 44, the wall brightness due to the current daylight is calculated (ST44). The current brightness due to daylight is calculated from the following equation (3).
DLwln = Mwln-Lwln (3)
However,
DLwln: Wall brightness due to current daylight,
Mwln: Current wall brightness,
Lwln: Wall brightness due to current lighting,
Is.

Next, in step 45, the wall brightness supplemented by lighting is calculated (ST45). The wall brightness to be supplemented is calculated from the following equation (4).
HLwl = Mwla-DLwln (4')
However,
HLwl: Wall brightness to be supplemented,
Mwla: preset target wall brightness,
DLwln: Wall brightness due to current daylight,
Is.

Next, in step 46, the second wall illumination dimming rate is calculated from the following equation (5) (ST46).
Vwl2 = (HLwl-Dwl1) / Dwl2 (5)
However,
Vwl2: 2nd wall lighting dimming rate,
HLwl: Wall brightness to be supplemented,
Dwl1: 1st wall illumination factor,
Dwl2: 2nd wall lighting factor,
Is.
Here, the first illumination coefficient and the second illumination coefficient are constants representing the linear relationship between the dimming rate and the brightness.

Next, in step 47, it is determined whether or not the dimming rate of the second wall illumination is greater than 0 and less than 100% (ST47).

In step 47, when the second wall lighting dimming rate is larger than 0 and smaller than 100%, in step 48, the current wall lighting dimming rate is used as it is as the second wall lighting dimming rate as shown in the following equation (6). The rate (ST38).
Vwl2 = Vwln (6)
However,
Vwl2: 2nd wall lighting dimming rate,
Vwln: Current wall lighting dimming rate,
Is.

In step 47, when the dimming rate of the second wall illumination is larger than 0 and not less than 100%, it is determined in step 49 whether or not the wall brightness to be supplemented by the illumination is 0 or less (ST49).

In step 49, when the wall brightness to be supplemented is 0 or less, the second wall illumination dimming rate is set to 0% in step 50 (ST50). In step 49, when the wall brightness to be supplemented is 0 or more, the second wall illumination dimming rate is set to 100% in step 51 (ST51).

Next, returning to the main routine shown in FIG. 3, the ceiling lighting dimming rate is calculated in step 4 (ST4).

FIG. 7 shows a flowchart of the ceiling lighting dimming rate calculation.

First, in step 61, it is determined whether or not the ceiling illumination dimming rate calculation for each ceiling surface brightness is ON (ST61). If the ceiling lighting dimming rate calculation is ON in step 61, the ceiling lighting dimming rate calculation is executed in step 62 (ST62). The details of the ceiling lighting dimming rate calculation will be described later. When the ceiling lighting dimming rate calculation is OFF in step 61, the ceiling lighting dimming rate is temporarily stored as 0 in step 63 (ST63).

As shown in FIGS. 1 and 2, the ceiling surface near region 13 is divided into a first ceiling surface near region 131, a second ceiling surface near region 132, and a third ceiling surface near region 133. Therefore, in steps 41 to 43, the ceiling illumination dimming rate is calculated for each of the first ceiling surface vicinity region 131, the second ceiling surface vicinity region 132, and the third ceiling surface vicinity region 133. Therefore, in steps 61 to 63, the first ceiling lighting dimming rate, the second ceiling lighting dimming rate, and the third ceiling lighting dimming rate are obtained for each ceiling surface brightness.

The calculation of the ceiling lighting dimming rate for each of the first ceiling surface vicinity area 131, the second ceiling surface vicinity area 132, and the third ceiling surface vicinity area 133 is a flowchart of the second wall lighting dimming rate calculation shown in FIG. "Wall brightness" is read as "first ceiling brightness", "second ceiling brightness" and "third ceiling brightness", respectively, and "second wall lighting" and "wall lighting" are replaced with "first ceiling lighting". , "Second ceiling lighting" and "third ceiling lighting", respectively.

Next, in step 64, it is determined whether or not the ceiling lighting dimming rate calculation for each desk top surface illuminance is ON (ST64). If the ceiling lighting dimming rate calculation is ON in step 64, the ceiling lighting dimming rate calculation is executed in step 65 (ST65). The details of the ceiling lighting dimming rate calculation will be described later. When the ceiling lighting dimming rate calculation is OFF in step 64, the ceiling lighting dimming rate is temporarily stored as 0 in step 66 (ST66).

As shown in FIGS. 1 and 2, the desk surface vicinity region 14 is divided into a first desk surface vicinity region 141, a second desk top surface vicinity region 142, and a third desk top surface vicinity region 143. Therefore, in steps 64 to 66, the ceiling illumination dimming rate is calculated for each of the first desk upper surface vicinity region 141, the second desk upper surface vicinity region 142, and the third desk upper surface vicinity region 143. Therefore, in steps 64 to 66, the first ceiling lighting dimming rate, the second ceiling lighting dimming rate, and the third ceiling lighting dimming rate are obtained for each desk surface illuminance.

The desk surface illuminance is calculated from the brightness of the desk surface as shown in the following equation (7).
Md = π ・ Ld / ρ (7)
However,
Md: Desk top illuminance Ld: Desk top brightness ρ: Desk top reflectance,
Is.

The calculation of the ceiling lighting dimming rate for each of the first desk upper surface vicinity area 141, the second desk upper surface vicinity area 142, and the third desk upper surface vicinity area 143 is a flowchart of the second wall lighting dimming rate calculation shown in FIG. "Wall brightness" is read as "first desk top illuminance", "second desk top illuminance" and "third desk top illuminance", respectively, and "second wall lighting" and "wall lighting" are replaced with "first ceiling". It may be read and executed as "lighting", "second ceiling lighting" and "third ceiling lighting" respectively.

Next, in step 67, it is determined whether or not the ceiling illumination dimming rate calculation for the window brightness is ON (ST67). If the ceiling lighting dimming rate calculation is ON in step 67, the ceiling lighting dimming rate calculation is executed in step 68 (ST68). The details of the ceiling lighting dimming rate calculation will be described later. When the ceiling lighting dimming rate calculation is OFF in step 67, the ceiling lighting dimming rate is temporarily stored as 0 in step 69 (ST69).

In steps 67 to 69, the first ceiling illumination dimming rate is calculated for the area near the window surface 15. In the calculation of the ceiling lighting dimming rate of the area near the window surface 15, "wall brightness" in the flowchart of the second wall lighting dimming rate calculation shown in FIG. 6 is read as "window surface brightness", and "second wall lighting". And "wall lighting" may be read as "first ceiling lighting" and executed.

When the calculation of each ceiling lighting dimming rate shown in FIG. 7 is completed in step 4, the process proceeds to step 5 shown in FIG.

In step 5, of the first wall lighting dimming rate and the second wall lighting dimming rate, the larger dimming rate is temporarily stored as the wall lighting dimming rate (ST5). For the first wall lighting dimming rate and the second wall lighting dimming rate, the dimming rate calculated by the flowchart shown in FIG. 4 is used.

Subsequently, in step 6, the largest dimming rate among the dimming rates for the first ceiling surface brightness, the first desk surface illuminance, or the window surface brightness is temporarily stored as the first ceiling lighting dimming rate (ST6). ..

Subsequently, in step 7, the largest dimming rate among the dimming rates with respect to the second ceiling surface brightness or the second desk top surface illuminance is temporarily stored as the second ceiling lighting dimming rate (ST7).

Subsequently, in step 8, the largest dimming rate among the dimming rates with respect to the third ceiling surface brightness or the third desk top surface illuminance is temporarily stored as the third ceiling lighting dimming rate (ST8).

As each dimming rate to be compared in steps 6 to 8, each dimming rate calculated by the flowchart shown in FIG. 7 is used.

Next, in step 9, the dimming rate of each lighting is changed (ST9). That is, the wall lighting dimming rate is changed to the dimming rate temporarily stored in step 5. Further, the first ceiling lighting dimming rate is changed to step 6, the second ceiling lighting dimming rate is changed to step 7, and the third ceiling lighting dimming rate is changed to the dimming rate temporarily stored in step 8.

Next, in step 10, each lighting dimming rate is stored as the current lighting dimming rate (ST10).

As described above, the lighting control system of the present embodiment controls the wall lighting 32 and the dimming rate of the first ceiling lighting 331, the second ceiling lighting 332, and the third ceiling lighting 333 constituting the ceiling lighting 33, respectively. Is possible.

In the lighting control system of the present embodiment, the luminance camera 10 detects the luminance of the wall 2, the ceiling 3, the desk 4, and the window 5 to control the wall illumination 32 and the ceiling illumination 33. However, the luminance camera 10 does not have to detect all of the wall 2, the ceiling 3, the desk 4, and the window 5, but may detect at least one of them. Further, the brightness of at least a part of the room is not limited to the wall 2, the ceiling 3, the desk 4, and the window 5. Further, it is not necessary to control both the wall lighting 32 and the ceiling lighting 33 as the lighting to be controlled, and at least one of them may be detected. Further, the dimming rate of at least one of the indoor lighting is not limited to the wall lighting 32 and the ceiling lighting 33.

As described above, the lighting control system of the present embodiment is based on the current lighting 32, 33 installed in the room, the brightness camera 10 for detecting the brightness of at least a part of the room, and the dimming rate of the current lighting 32, 33. The brightness due to the illuminations 32 and 33 is calculated, the brightness due to daylight is calculated from the difference between the brightness detected by the brightness camera 10 and the brightness due to the current illuminations 32 and 33, and based on the difference between the target brightness and the brightness due to daylight. A control unit for controlling the dimming rate of the lights 32 and 33 is provided. Therefore, the number of sensors used in the system can be reduced, and the influence of the direct incident of the reflected light of the solar radiation can be almost eliminated, and the dimming rate of the illuminations 32 and 33 can be accurately controlled by one luminance camera 10. Can be controlled to.

Further, in the lighting control system according to the present invention, when the difference between the target brightness and the brightness due to daylight is larger than 0, the control unit calculates the dimming rate from the following equation (A). Therefore, it is possible to accurately control the dimming rate of the illuminations 32 and 33.
V = (HL-D1) / D2 (A)
However,
V: Lighting dimming rate,
HL: Brightness to be supplemented,
D1: First illumination coefficient,
D2: 2nd lighting factor,
Is.
Here, the first illumination coefficient and the second illumination coefficient are constants representing the linear relationship between the dimming rate and the brightness.

Further, in the lighting control system according to the present invention, the lighting 32 and 33 are installed separately in a plurality of areas, the luminance camera 10 is installed toward the window 5, and the indoor wall 2, ceiling 3 and window 5 are installed. The control unit detects at least a part of the brightness and controls the dimming rate of the illuminations 32 and 33 for each of a plurality of areas. Therefore, it is possible to detect the brightness close to the appearance of the occupant, and it is possible to perform different control for each position of the lighting in the room.

Further, in the lighting control system according to the present invention, the brightness camera 10 detects the brightness of at least a part of the desk surface 4 in the room, and the control unit controls the lighting 32 based on the illuminance acquired from the brightness of the desk surface 4. , 33 to control the dimming rate. Therefore, it is possible to control the lighting based on the working position of the occupant.

Further, in the lighting control system according to the present invention, the control unit calculates the brightness from the following equation (B). Therefore, it is possible to control the lighting from the feeling of brightness of the brightness, and it is possible to correspond to different indexes.
log ₁₀ (y) = a ₁ log ₁₀ (x) ＋ a ₂ log ₁₀ ρ ＋ a ₃ ω ＋ a ₄ (B)
However,
y: wall brightness,
x: Current value of window brightness,
ρ: Reflectance on the desk surface,
ω: Solid angle of the window,
Is.
Further, a ₁ , a ₂ , a ₃ , and a ₄ satisfy the following conditions.
0.6 <a ₁ <0.9
0.8 <a ₂ <1.2
0.2 <a ₃ <0.4
0 ≤ a ₄

The present invention is not limited to this embodiment. That is, in the description of the embodiment, many specific detailed contents are included for illustration purposes, but those skilled in the art may make various variations or changes to these detailed contents.

1 ... Temperature detector 2 ... Wall 3 ... Ceiling 4 ... Desktop 5 ... Window 6 ... Floor 10 ... Brightness camera 12 ... Wall surface area 13 ... Ceiling surface area 14 ... Desk surface area 15 ... Window surface area 22 ... Wall surface Measurement point 23 ... Ceiling surface measurement point 24 ... Desk surface measurement point 25 ... Window surface measurement point 32 ... Wall lighting 33 ... Ceiling lighting

Claims (4)

Lighting installed in the room and
One luminance camera that detects the luminance of the measurement point set in the room, and
The brightness due to daylight is calculated from the difference between the brightness of the measurement point detected by the brightness camera and the brightness of the measurement point due to the current lighting, and is based on the difference between the target brightness of the measurement point and the brightness due to the daylight. A control unit that controls the dimming rate of the lighting,
Equipped with
The control unit calculates the target brightness of the measurement point from the current value of the window surface brightness detected by the brightness camera.
The control unit calculates the target brightness of the measurement point from the current value of the window surface brightness detected by the brightness camera by the following equation (B).
A lighting control system characterized by that.
log ₁₀ (y) = a ₁ log ₁₀ (x) ＋ a ₂ log ₁₀ ρ ＋ a ₃ ω ＋ a ₄ (B)
However,
y: Target brightness at the measurement point,
x: Current value of window brightness,
ρ: Reflectance on the desk surface,
ω: Solid angle of the window,
Is.
Further, a ₁ , a ₂ , a ₃ , and a ₄ satisfy the following conditions.
0.6 <a ₁ <0.9
0.8 <a ₂ <1.2
0.2 <a ₃ <0.4
0 ≤ a ₄ The first aspect of claim 1 , wherein the control unit calculates a dimming rate from the following equation (A) when the difference between the target brightness of the measurement point and the brightness due to the daylight is larger than 0. Lighting control system.
V = (HL-D1) / D2 (A)
However,
V: Lighting dimming rate,
HL: Luminance to be supplemented (difference between the target luminance at the measurement point and the luminance due to the daylight),
D1: First illumination coefficient,
D2: 2nd lighting factor,
Is. The lighting is divided into a plurality of areas in the room and installed.
The lighting control system according to claim 1 or 2 , wherein the control unit controls the dimming rate of the lighting for each of the plurality of areas. The brightness camera detects the brightness of at least a part of the desk surface in the room.
The lighting control system according to any one of claims 1 to 3 , wherein the control unit controls the dimming rate of the lighting based on the illuminance acquired from the brightness of the desk surface.

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