JP5891450B2 - Lighting control system - Google Patents

Description

  The present invention relates to an illumination control system that measures the illuminance of an illumination area with an illuminance sensor and controls the illumination device based on the measurement result.

  Conventionally, the illuminance in the illumination area by the illuminator is measured by the illuminance sensor, and based on the illuminance information signal indicating the measured illuminance, the management terminal is connected to the An illumination control system that controls illuminance is known (see, for example, Patent Document 1). In this illumination control system, the illuminance sensor always sends an illuminance information signal to the management terminal.

JP 2010-10939 A

  Here, in a building such as an office building or a house, there is a case where a lighting device is provided and there is a room into which external light such as sunlight is inserted from a window, and the lighting control system is introduced into this room. In that case, even if the illuminance in the room changes with the fluctuation of the amount of sunlight, the illuminance sensor always sends out the illuminance information signal, and the illuminance in the room is returned to the target value based on the illuminance information signal. Therefore, the time lag until the illuminance returns to the target value is shortened. However, the illuminance change of sunlight is basically gradual, and even if it is abrupt, the frequency of such change is low. Therefore, even if the illuminance control is always performed based on the illuminance information signal, the control is inefficient.

  Therefore, in the illumination control system, it is conceivable to periodically transmit an illuminance information signal from the illuminance sensor to the management terminal device at an appropriate time interval in order to improve control efficiency.

  However, in such a configuration, even if the illuminance in the room changes and deviates from the target value during the vacant time of transmission of the illuminance information signal, during the vacant period, it is not possible to cope with the change in illuminance. The illuminance is left as it is. The change in illuminance can be handled when the management terminal receives the next illuminance information signal from the illuminance sensor. Therefore, the period (time lag) until the illuminance is returned to the target value becomes long, and when the illuminance change is abrupt, the illuminance may deviate significantly from the target value.

  The present invention has been made to solve the above problems, and can efficiently control the illuminance in an illumination area such as a room, and the illuminance can be reduced even if the illuminance changes rapidly due to the influence of outside light or the like. An object of the present invention is to provide a lighting control system that can be quickly returned to reduce the amount of change.

To achieve the above object, an illumination control system of the present invention includes an illumination device capable of adjusting illuminance, an illuminance sensor that measures illuminance in an illumination area by the illuminator, and illuminance information that indicates measurement illuminance by the illuminance sensor. An illumination control system that sends a control signal for controlling the illuminance of the illuminating device to the illuminating device based on a signal, wherein the illuminance sensor transmits the illuminance information to the illumination control device. An illuminance information transmission unit that transmits a signal; and a time information acquisition unit that acquires time information indicating the current time. The illuminance information transmission unit periodically transmits the illuminance information signal at predetermined time intervals. while, the change in the measured illuminance and sends the illuminance information signal even when a predetermined condition is satisfied, the predetermined condition, the first time zone from sunrise to sunset, per predetermined time period The first condition in which the change amount of the measured illuminance exceeds a reference predetermined value, or the second condition in which the change rate exceeds a reference predetermined value, and in a second time zone from sunset to the next sunrise, The measurement illuminance is set to a third condition that exceeds or falls below a reference threshold value .

  In this invention, the predetermined condition is preferably that the amount of change or rate of change of the measured illuminance per predetermined time exceeds a predetermined value, or the measured illuminance exceeds or falls below a threshold value.

  According to the present invention, since the illuminance information signal is periodically transmitted from the illuminance sensor to the illumination control device, the illumination control device can control the illumination device at an appropriate time interval based on the illuminance information signal. Control is more efficient than in the case of constant control. Moreover, even if the illuminance changes suddenly due to the influence of outside light or the like during the vacant period of regular transmission of the illuminance information signal, if the change satisfies a predetermined condition, the illuminance information signal is sent from the illuminance sensor, The amount of change can be reduced by quickly returning the illuminance based on the illuminance information signal.

The one-point perspective diagram which shows the example of application of the illumination control system which concerns on one Embodiment of this invention. The electric block diagram of the said illumination control system. FIG. 3 is a setting sequence diagram of an illuminance sensor in the illumination control system. The dimming control sequence figure of the illuminating device at the time of the spontaneous transmission mode in the said illumination control system. The dimming control sequence figure of the illuminating device at the time of the selection request | requirement mode in the said illumination control system. The figure which shows the operation example of the said illumination control system. The electric block diagram of the illumination control system which concerns on the modification of the said embodiment. The flowchart which shows the automatic change process of the transmission conditions of the illumination intensity information signal exceeding a reference | standard in the said illumination intensity control system.

  An illumination control system according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a configuration of a lighting control system of the present embodiment. The illumination control system 1 includes illumination devices 2A and 2B (hereinafter collectively referred to as illumination device 2), an illuminance sensor 3 that measures the illuminance in the illumination area A1 by the illumination device 2, and the illumination device 2 based on the measurement result. A transmission master unit 4 (illumination control device) that performs dimming control, and a setting device 5. The setting device 5 is for performing settings relating to illuminance measurement by the illuminance sensor 3 and dimming control to the illumination device 2.

  Each illuminating device 2 is configured to be capable of adjusting the illuminance, that is, to be dimmable, and is installed on the indoor ceiling or wall. The number of lighting devices 2 is not limited to two (2A, 2B) as illustrated, and may be one or three or more.

  The illuminance sensor 3 is installed at a position where the illuminance of the illumination area A1 can be measured, such as an indoor ceiling or wall. The illuminance sensor 3 receives the illumination light L1 of the illumination device 2 that illuminates the illumination area A1 and external light to be inserted into the illumination area A1, for example, sunlight L2, and combines the illumination light L1 and the external light. Measure the illuminance.

  The transmission master unit 4 increases or decreases the illuminance of the illumination device 2 based on the measurement result of the illuminance sensor 3 when the illuminance in the illumination area A1 is likely to change due to fluctuations in the amount of external light, and the illuminance is kept constant. Keep on.

  The illuminating device 2, the illuminance sensor 3, the transmission master unit 4, and the setting unit 5 are connected in a bus form by, for example, a two-wire signal line 6 having positive and negative polarities, and each is assigned an address. ing. The transmission master unit 4 centrally controls signal transmission between each device in the illumination control system 1 using those addresses. The transmission master unit 4 is incorporated in a distribution board, for example.

  FIG. 2 shows the configuration of each of the lighting device 2, the illuminance sensor 3, the transmission parent device 4, and the setting device 5. Since each illuminating device 2 has the same configuration, only the illuminating device 2A as a representative of the illuminating devices 2 will be described.

  The lighting device 2A includes a light source 21, a communication circuit 22 that receives a control signal for controlling the light source 21 from the transmission parent device 4, and a light source 21 that is turned on and off based on the control signal received by the communication circuit 22. And a control circuit 23 for controlling dimming.

  The illuminance sensor 3 includes a sensor element 31 that measures the current illuminance in the illumination area A1 (see FIG. 1), and an illuminance information signal (hereinafter simply referred to as illuminance) indicating the measured illuminance (hereinafter simply referred to as measured illuminance) by the sensor element 31. An A / D conversion circuit 32 that performs A / D conversion of the information signal. In addition, the illuminance sensor 3 includes a communication circuit 33 that sends the illuminance information signal after A / D conversion by the A / D conversion circuit 32 to the transmission parent device 4, a control circuit 34 that performs communication control of the communication circuit 33, And an operation unit 35 for performing settings relating to transmission of information signals. The communication circuit 33 and the control circuit 34 constitute an illuminance information sending unit.

  The communication circuit 33 periodically transmits an illuminance information signal at predetermined time intervals, and also transmits an illuminance information signal when a change in measured illuminance satisfies a predetermined transmission condition. As the transmission conditions, for example, first to third conditions described later are set, and these can be selected using either the operation unit 35 or the setting device 5. The first condition is that the amount of change in measured illuminance per predetermined time, for example, 1 second, exceeds a reference predetermined value, for example, 1000 lx. The second condition is that the change rate of the measured illuminance per predetermined time, for example, 1 second, exceeds a reference predetermined value, for example, 50%. The third condition is that the measured illuminance is above or below the reference threshold. The reference threshold value is, for example, 50 lx, or illuminance obtained by adding a value obtained by multiplying the difference between the upper limit value and lower limit value of the illuminance range measurable by the sensor element 31 by a predetermined ratio, for example, 20%, to the lower limit value. Hereinafter, the change in the measured illuminance that satisfies the above transmission conditions is referred to as “change exceeding the reference”, the measured illuminance at the time when the change exceeds the reference is referred to as “exceeded reference illuminance”, and the illuminance information signal indicating the illuminance exceeding the reference is referred to as “exceed the reference”. It is called “illuminance information signal”. It is desirable that the control circuit 34 sends an interrupt signal that determines the priority of processing based on the reference illuminance information signal to the transmission base unit 4 together with the illuminance information signal that exceeds the reference. The process is a process of sending a control signal for controlling the light source 21 to each lighting device 2.

  Further, the communication circuit 33 executes the transmission process of the illuminance information signal exceeding the reference in any one of the non-transmission mode, the spontaneous transmission mode, and the selecting request mode. In the non-transmission mode, the communication circuit 33 does not send the illuminance information signal exceeding the reference even when the measured illuminance exceeds the reference. In the spontaneous transmission mode, the communication circuit 33 spontaneously transmits an illuminance information signal exceeding the reference by unicasting to the transmission master unit 4 or multicasting or broadcasting to other devices in the lighting control system 1 when the reference is exceeded. Send. In the selecting request mode, the communication circuit 33 transmits only the illuminance change information signal indicating that the change has occurred when the communication circuit reference is exceeded, to the transmission parent device 4 as a selecting request signal. In this case, the transmission parent device 4 requests the communication circuit 33 to transmit an illuminance information signal exceeding the reference as a response to the illuminance change information signal, and the communication circuit 33 exceeds the reference to the transmission parent device 4 as a response to the request. Transmit illuminance information signal.

  The control circuit 34 determines whether or not the measured illuminance satisfies the above transmission condition, and when the measured illuminance satisfies the transmission condition, causes the communication circuit 33 to transmit an illuminance information signal. The control circuit 34 can be configured by a microprocessor including a CPU.

  The operation unit 35 includes a transmission mode selection switch 35a, a transmission condition selection switch 35b, a parameter adjustment switch 35c, and a setting storage switch 35d. The transmission mode selection switch 35a is a switch for selecting a transmission mode of the illuminance information signal exceeding the reference. The transmission condition selection switch 35b is a switch for selecting a transmission condition for the illuminance information signal exceeding the reference. The parameter adjustment switch 35c is a switch for setting a predetermined reference value or threshold value for the type of transmission condition selected by the transmission condition selection switch 35b. The setting storage switch 35d is a switch for instructing the storage of various setting contents by other switches of the operation unit 35. The control circuit 34 stores the setting information by the transmission mode selection switch 35a, the reference setting switch 35b, and the parameter adjustment switch 35c in a memory (not shown) according to the operation of the setting storage switch 35d by the user. The control circuit 34 operates according to the setting information stored in the memory.

  The transmission parent device 4 includes a communication circuit 41 that can communicate with each device in the lighting control system 1, and a control circuit 42 that controls communication of the communication circuit 41. The control circuit 42 uses the communication circuit 41 to perform centralized control of each device in the illumination control system 1 and communication control between the devices. Based on the illuminance information signal from the illuminance sensor 3 received by the communication circuit 41, the control circuit 42 creates a control signal for controlling the illuminance in the illumination device 2, and the communication circuit 41 is created. A control signal is sent to the lighting device 2. The control circuit 42 controls the illuminance of each lighting device 2 so that the measured illuminance by the illuminance sensor 3 falls within a preset allowable range based on the target value, thereby making the illuminance in the illumination area A1 substantially constant. keep. In the transmission of the illuminance information signal exceeding the reference by the illuminance sensor 3, the threshold value that is the reference of the third condition is set to a value outside this allowable range. The control circuit 42 may control the illuminance of each lighting device 2 uniformly, or may control the illuminance independently of each other.

  Further, when receiving an interrupt signal from the illuminance sensor 3, the control circuit 42 executes a control signal sending process with a priority determined by the interrupt signal. For example, when the interrupt signal is received, the control circuit 42 is executing a process other than the above-described sending process, and the priority of the process being executed and the priority determined by the interrupt signal (the priority of the sending process) ). If the priority of the sending process is higher than the priority of the process being executed, the control circuit 42 temporarily suspends the process being executed, executes the sending process, and then interrupts the process. To resume. In addition, when receiving an interrupt signal, the control circuit 42 compares the priority of the process scheduled to be executed with the priority of the transmission process when other processes other than the above-described transmission process are to be executed. Then, if the priority of the sending process is higher than the priority of the process scheduled to be executed, the control circuit 42 delays the process scheduled to be executed and executes the sending process first.

  The setting device 5 includes an operation unit 51 for setting the illuminance sensor 3, a communication circuit 52 that can communicate with the illuminance sensor 3, a display unit 53 that displays setting information by the operation unit 51, and setting information by the operation unit 51. Is transmitted from the communication circuit 52 to the illuminance sensor 3. The operation unit 51 includes a transmission mode selection switch 51a, a transmission condition selection switch 51b, a parameter adjustment switch 51c, and a setting storage switch 51d each having the same configuration as the various switches of the operation unit 35. The operation unit 51 further includes a setting confirmation switch 51e for instructing confirmation of a current setting (hereinafter, simply referred to as a current setting of the illuminance sensor 3) related to the process of sending the illuminance information signal exceeding the reference of the illuminance sensor 3.

  Next, a communication method between each device in the illumination control system 1 will be described. When the control circuit 34 of the illuminance sensor 3 and the control circuit 54 of the setting device 5 are to send various signals, they send a signal with the preset address of the own device as the address of the transmission source.

  The control circuit 42 of the transmission base unit 4 receives the various signals sent out, determines the transmission destination from the contents of the received signal and the address attached to the signal, and adds the transmission destination address. Send the signal.

  The control circuit 23 of the illuminating device 2 and the control circuit 34 of the illuminance sensor 3 compare the addresses of the transmission destinations attached to various signals transmitted through the signal line 6 with the addresses of their own devices set in advance. When the two match, the transmitted signal is recognized as a signal addressed to itself.

  By the way, as described above, the illuminance sensor 3 uses the operation unit 35 of the illuminance sensor 3 or the setting device 5 provided separately from the illuminance sensor 3 for the transmission process of the illuminance information signal exceeding the reference. Can also be set. Therefore, in order to accurately grasp the current setting of the illuminance sensor 3 by the setting device 5, when setting is performed using the operation unit 35, the setting information is notified to the setting device 5 or by the setting device 5. It is necessary to check the current setting by accessing the illuminance sensor 3 for each setting. This embodiment is configured to execute the latter confirmation process.

  FIG. 3 shows the procedure of the confirmation process. Various communication processes among the lighting device 2, the illuminance sensor 3, the transmission master device 4, and the setting device 5 are executed by the respective communication circuits under the control of the respective control circuits. Description is omitted.

  When the setting confirmation switch 51e of the setting device 5 is operated, the setting device 5 sends a setting information request signal for requesting disclosure of the current setting information to the signal line 6 (S11). The transmission base unit 4 receives the setting information request signal sent from the setting device 5 via the signal line 6, discriminates the transmission destination of the setting information request signal from the illuminance sensor 3, and transmits the setting information request signal to the illuminance sensor. 3 (S12).

  The illuminance sensor 3 confirms the current setting information and sends a setting information notification signal indicating the setting information to the signal line 6 (S13). The transmission base unit 4 receives the setting information notification signal from the illuminance sensor 3 via the signal line 6, determines the transmission destination of the setting information notification signal as the setting device 5, and sends the setting information notification signal to the setting device 5. Transfer (S14).

  When the operation unit 51 of the setting device 5 is operated and setting information of the illuminance sensor 3 is input, the setting device 5 sends a setting reflection request signal for requesting reflection of the setting information to the signal line 6. (S15). The transmission base unit 4 receives the setting reflection request signal from the setting device 5 via the signal line 6, determines the transmission destination of the setting information request signal as the illuminance sensor 3, and sends the setting reflection request signal to the illuminance sensor 3. Transfer (S16).

FIG. 4 shows a procedure of dimming control processing of the illumination device 2 when the transmission mode of the illuminance sensor 3 is set to the spontaneous transmission mode. Transmission base unit 4 transmits the illumination information signal request signal requesting transmission of the illumination information signal at predetermined time intervals T ₁ to the illuminance sensor 3 (S21). Each time the illuminance sensor 3 receives the illuminance information signal request signal from the transmission parent device 4, the illuminance sensor 3 returns an illuminance information signal indicating the current measured illuminance to the transmission parent device 4 (S22). In this way, the illuminance sensor 3 periodically transmits an illuminance information signal. When the transmission master unit 4 receives the illuminance information signal from the illuminance sensor 3, it transmits a control signal for maintaining the illuminance of the illumination area A1 (see FIG. 1) constant based on the measured illuminance indicated by the illuminance information signal. It transmits to each illuminating device 2, and dimming control of the illuminating device 2 is carried out (S23).

  When the measurement illuminance in the illumination area A1 changes beyond the reference, the illuminance sensor 3 immediately transmits an illuminance information signal exceeding the reference to the transmission parent device 4 (S24). Based on the illuminance information signal exceeding the reference from the illuminance sensor 3, the transmission parent device 4 executes a dimming control process equivalent to S23 (S25).

  FIG. 5 shows a procedure of dimming control processing of the illumination device 2 when the transmission mode of the illuminance sensor 3 is set to the selection request mode. In this dimming control process, the processes of S24 and S25 are changed to the processes of S31 to S36 as compared with the process shown in FIG. 4, and only the changed points will be described.

  When a change exceeding the reference occurs for the measured illuminance in the illumination area A1, the illuminance sensor 3 transmits an illuminance change information signal indicating the occurrence of the change exceeding the reference to the transmission parent device 4 (S31). When receiving the illuminance change information signal from the illuminance sensor 3, the transmission parent device 4 outputs a selecting signal to the illuminance sensor 3 (S32). When the illuminance sensor 3 receives the selecting signal from the transmission parent device 4, the illuminance sensor 3 recognizes that the own device has been selected as a communication target of the transmission parent device 4, and transmits a response signal indicating that the selection has been recognized. 4 is returned (S33). In this way, communication between the illuminance sensor 3 and the transmission parent device 4 is established, and the transmission parent device 4 sends the illuminance information signal request signal to the illuminance sensor 3 based on the reception of the response signal from the illuminance sensor 3. It is sent out (S34). When the illuminance sensor 3 receives the illuminance information signal request signal from the transmission parent device 4, the illuminance sensor 3 returns an illuminance information signal exceeding the reference to the transmission parent device 4 (S35). In order to maintain the illuminance of the illumination area A1 (see FIG. 1) constant based on the measured illuminance indicated by the excess illuminance information signal from the illuminance sensor 3 when the transmission parent device 4 receives the excess illuminance information signal from the illuminance sensor 3. Is transmitted to each lighting device 2, and the lighting device 2 is dimmed and controlled (S36).

Next, operation | movement of the illumination control system 1 of this embodiment is demonstrated with reference to FIG. FIG. 6 shows an example of a change in illuminance in the illumination area A1 controlled by the illumination control system 1. In the figure, the target illuminance is I _T , the allowable range is A ₂ , the illuminance threshold that is a criterion for determining whether or not the transmission condition of the illuminance sensor 3 exceeds the illuminance information signal is satisfied, I _TH , Let T ₁ be the interval of regular transmission (interval of regular illuminance measurement). Here, it is assumed that the transmission condition is that the illuminance in the illumination area A1 is lower than the threshold value _ITH (third condition).

As shown, from being periodically transmitted illumination information signal in the illumination area A1 to transmit the master unit 4 at intervals T ₁ time from the illuminance sensor 3, the transmission master station 4 is the illumination information signal Based on this, it is possible to control the lighting device 2 with an appropriate time interval. Therefore, the control can be made more efficient than in the case of constant control.

Further, since the illuminance of the illumination devices 2 as illuminance in the illumination area A1 is within the allowable range A ₂ is controlled, it is possible to maintain the illuminance in the illumination area A1 substantially constant.

Further, even if the illuminance in the illumination area A1 falls below the threshold value _ITH due to the influence of outside light or the like during the period of regular transmission of the illuminance information signal, conventionally, the transmission master unit 4 receives the next illuminance information signal. Until the illuminance control of each lighting device 2 is performed, the illuminance in the illumination area A1 is left as it is. Here, since the illuminance is below the threshold I _TH standards, the conventional time lag until the illuminance in the illumination area A1 is returned to within the permissible range A ₂ and T _2.

On the other hand, in this embodiment, when the illuminance in the illumination area A1 is lower than the threshold value _ITH , the illuminance sensor 3 sends an illuminance information signal exceeding the reference to the transmission parent device 4. Therefore, the transmission master unit 4 does not wait for the next illuminance information signal by regular transmission, and controls the illuminance of each lighting device 2 based on the illuminance information signal exceeding the reference to allow the illuminance in the illumination area A1. it can be quickly returned to the range a _2. Therefore, the time lag T ₃ of the present embodiment is shorter than the conventional time lag T ₂ . As a result, even if the illuminance change in the illumination area A1 is abrupt, the amount of change can be reduced, and the accuracy of illuminance control can be improved.

  Further, although not shown in FIG. 6, when the illuminance sensor 3 sends an illuminance information signal exceeding the reference together with the interrupt signal, the transmission master unit 4 performs the illuminance control processing of the lighting device 2 based on the interrupt signal. Can be preferentially executed. Therefore, the response speed of the illuminance control when the illuminance changes can be improved.

  Next, an illumination control system 1 according to a modification of the embodiment will be described with reference to FIG. FIG. 7 shows a configuration of the illumination control system 1 of the present modification. In this modification, the illuminance sensor 3 further includes a timer 37. The control circuit 34 uses the timer 37 to acquire current time information indicating the current time (time information acquisition unit), and based on the acquired current time information, the transmission condition for the illuminance information signal exceeding the reference of the illuminance sensor 3 (Hereinafter simply referred to as transmission conditions) is automatically changed. The transmission condition is changed according to the time zone. The operation unit 35 and the setting device 5 of the illuminance sensor 3 respectively have condition automatic change setting switches 35e and 51f for setting automatic change of the transmission condition or canceling the setting.

  Here, a time zone from sunrise to sunset is defined as a first time zone, and a time zone from sunset to the next daybreak (sunrise) is defined as a second time zone. Comparing the first time zone and the second time zone, in the first time zone, the illuminance of the sunlight L2 to be inserted into the illumination area A1 (see FIG. 1) is greatly attributed to the height of the sun and the weather. The amount of change in illuminance in the illumination area A1 increases. Moreover, the illuminance of the sunlight L2 may fluctuate significantly in a short time, and the illuminance change rate per predetermined time in the illumination area A1 may increase. On the other hand, since the illuminance of the illumination area A1 is hardly affected by the sunlight L2 in the second time zone, even if the illuminance of the illumination area A1 changes, the change amount is small and the change rate is also low. .

  Therefore, the control circuit 34 changes the transmission condition in the first time zone to the first condition in which the change amount of the measured illuminance per predetermined time exceeds the reference predetermined value, or the second condition in which the change rate exceeds the reference predetermined value. Set. Whether the transmission condition for the first time period is set to the first condition or the second condition may be set in advance or may be set by a user operation. Then, the control circuit 34 sets the transmission condition in the second time zone to a third condition where the measured illuminance exceeds or falls below the reference threshold.

  FIG. 8 shows the procedure of the transmission condition automatic change processing in this modification. The control circuit 34 acquires the current time information using the timer 37 when the automatic change setting of the transmission condition is made by either of the condition automatic change setting switches 35e and 51f (Yes in S51) (S52). Then, the control circuit 34 determines whether or not the current time is the first time zone, and determines that the current time is the first time zone (Yes in S53), sets the transmission condition to the first condition or the second condition. Then, the illuminance control of each lighting device 2 is performed based on the set conditions (S55).

  On the other hand, when it is determined that the current time is not the first time zone but the second time zone (No in S53), the control circuit 34 sets the transmission condition to the third condition (S56). Illuminance control is performed (S57).

  In this modification, the illuminance control suitable for the time zone can be performed, and the illuminance control performance can be improved.

  In addition, this invention is not limited to the structure of said embodiment and modification, Various deformation | transformation are possible according to a use purpose. For example, the processes S11 to S14 illustrated in FIG. 3 may be omitted.

  Further, the illuminance sensor 3 may be timed by a timer and voluntarily transmit an illuminance information signal to the transmission master unit 4 voluntarily. Further, if the change rate of the measured illuminance per predetermined time is higher than a predetermined value, the control circuit 34 of the illuminance sensor 3 sets the transmission condition for the illuminance information signal exceeding the reference to the first condition or the second condition, and the above change If the rate is lower than the predetermined value, the transmission condition may be set to the third condition. In that case, fine illuminance control becomes possible.

  Further, communication between the illuminance sensor 3 and the transmission parent device 4 may be performed by a polling method. In this case, when the transmission master unit 4 receives the illuminance change information signal from the illuminance sensor 3 (see S31 in FIG. 5), it returns a polling signal to the illuminance sensor 3, and then establishes polling communication between them. Is done.

The transmission master unit 4 may be provided separately from the distribution board and may be installed on the ceiling or the like. Further, the control circuit 42 of the transmission parent device 4 may store a history of measured illuminance in a memory based on the illuminance information signal periodically transmitted from the illuminance sensor 3. Then, the control circuit 42, based on the history, and predicts a change in illuminance of the illumination area A1, the prediction based on the result, allowable illuminance of the illumination area A1 ranges A ₂ beforehand so as not to outside the illumination devices 2 The illuminance control may be performed.

DESCRIPTION OF SYMBOLS 1 Lighting control system 2 Lighting apparatus 3 Illuminance sensor 33 Communication circuit (illuminance information sending part)
34 Control circuit (illuminance information sending part, time information obtaining part)
37 Timer 4 Transmission master unit (lighting control device)
A1 lighting area

Claims (2)

An illumination device capable of adjusting the illuminance;
An illuminance sensor for measuring illuminance in an illumination area by the illumination device;
In an illumination control system comprising: an illumination control device that sends a control signal for controlling the illumination intensity of the illumination device to the illumination device, based on an illumination information signal indicating illumination intensity measured by the illumination sensor;
The illuminance sensor has an illuminance information transmission unit that transmits the illuminance information signal to the illumination control device, and a time information acquisition unit that acquires time information indicating the current time ,
The illuminance information sending unit periodically sends the illuminance information signal at a predetermined time interval, and also sends the illuminance information signal when the change in the measured illuminance satisfies a predetermined condition. In the first time zone from sunrise to sunset, the first condition in which the amount of change in the measured illuminance per predetermined time exceeds the reference predetermined value, or the second condition in which the change rate exceeds the reference predetermined value is set. In the second time zone from sunset to the next sunrise , the illumination control system is set to a third condition in which the measured illuminance exceeds or falls below a reference threshold . The illuminance information sending unit sends an interrupt signal that determines a priority of sending processing of the control signal based on the illuminance information signal together with the illuminance information signal to the illumination control device,
The lighting control device, when receiving an interrupt signal from the illuminance information sending unit, an illumination according to claim 1, characterized in that to perform the transmission processing of the control signals in priority defined by said interrupt signal Control system.

Images