JP6083543B2 - Lighting control system - Google Patents

Description

  The present invention relates to an illumination control system that includes an illuminance sensor and controls a dimming state of a lighting fixture.

  2. Description of the Related Art Conventionally, lighting control systems that can control the dimming states of a plurality of lighting fixtures individually or collectively in cooperation with sensors such as a brightness sensor and a human sensor have been introduced. In this illumination control system, the illuminance of the luminaire can be appropriately controlled according to the brightness and time zone of outside light, so that energy saving can be achieved.

  In the illumination control system, the illuminance sensor performs dimming control of the luminaire so that the average illuminance of the irradiated surface immediately below the illuminance sensor is always kept constant according to the detection value. For this reason, when the user uses the sensor-equipped lighting fixture 91 as shown in FIG. 14, it is necessary to individually set the illuminance value to be kept constant by feedback control. This is because the light detected by the sensor-equipped lighting fixture 91 depends on the reflectivity of the desk top surface 92 and the like serving as the irradiated surface.

  There is also known an illumination control device that instructs a remote control command to a measurement / measurement mode, changes a dimming signal value for a lighting fixture, and detects illuminance at that time (see, for example, Patent Document 1). This lighting control device sets and stores dimming curve data indicating the correlation between the calculated dimming signal value and the dimming rate based on the measured illuminance detection value. Based on this, dimming control is performed.

  Furthermore, the target value of the output value of the illuminance sensor that is set to make the illuminance of the illuminated surface substantially constant can be automatically set, and even if the reflectance of the illuminated surface changes due to layout changes, etc. There is also known a lighting fixture that can keep the illuminance of the lamp substantially constant (see, for example, Patent Document 2).

JP 2001-338774 A JP 2005-243314 A

  However, in the above conventional method, using a dedicated setting device or the like, the correlation ratio between the illuminance value detected by the illuminance sensor installed on the ceiling surface and the illuminance value of the irradiated surface is acquired in advance to obtain the illuminance sensor. Setting work is required, which is time consuming and difficult to set. In addition, this setting work is required every time the interior is changed or the floor layout is changed, which is a burden for the installer and the building manager.

  Furthermore, in the illumination control system, when automatically controlling the illuminance of the luminaire (feedback control), it is preferable to perform dimming control within the target illuminance range with as few controls as possible without causing illuminance overshoot.

  The present invention has been made in view of the above-described problem, and illumination that can control a dimming space to a constant target illuminance based on a predetermined dimming control algorithm while eliminating the need for prior illuminance setting work and the like. An object is to provide a control system.

In order to achieve the above object, the present invention relates to an illuminance sensor that measures the illuminance of a surface to be illuminated, and light to a lighting fixture so that the illuminance of the surface to be illuminated becomes a target illuminance value based on the output value of the illuminance sensor. In the illumination control system including a control unit that controls output, the control unit stores the preset target illuminance value and the measured illuminance value measured by the illuminance sensor, and the target illuminance Determining means for detecting a difference between a value and the measured illuminance value, and determining whether or not the difference is within an allowable range , wherein the determination means includes the target illuminance value and the measured illuminance value; If it is determined that the difference is not within the allowable range, the lighting fixture is assumed to be all of the contribution to the measured illuminance value, and the lighting is performed using a predetermined ratio that is predetermined within a range not exceeding the target illuminance value. Dimming system for fixtures It is characterized in further comprising a control information generation means for generating amount.

  In this illumination control system, it is preferable that the control information generation unit generates a dimming level that is the dimming control amount so as to satisfy the following expression as the predetermined ratio.

(Equation 1)
L _{n + 1} = Ln · At / An
Here, L _{n + 1} : dimming level at time point (n + 1), Ln: dimming level at time point n, At: target illuminance value (lx), and An: measured illuminance value (lx) at time point n.

  In this illumination control system, it is preferable that the control information generation unit generates a dimming level that is the dimming control amount so as to satisfy the following expression as the predetermined ratio.

(Equation 2)
L _{n + 1} = Ln · At (1 ± ε) / An
Here, L _{n + 1} : Light control level at time point (n + 1), Ln: Light control level at time point n, At: Target illuminance value (lx), An: Measured illuminance value (lx) at time point n, ε: Target illuminance value This is a ratio of an allowable error with respect to (lx).

  In this illumination control system, when the control information generation unit determines that the difference between the measured illuminance value and the target illuminance value is within an allowable range after the control with the dimming control amount, Ends the dimming control process, if it is determined that it is not within the allowable range, the control relation value is calculated based on the dimming change amount and the illuminance value change amount based on the previous control, and the control relation value and It is preferable to generate the next dimming control amount based on the difference.

  In this lighting control system, it is preferable that the control information generation unit does not update the control-related value while holding the control-related value in the storage unit for a predetermined period.

  According to the illumination control system of the present invention, the control relationship value is calculated by measuring the illuminance value change amount with a small dimming control value, and the difference between the control relationship value and the measured current illuminance value and the target illuminance value is calculated. Based on this, dimming control can be performed. For this reason, it is possible to control the dimming space to a constant target illuminance while eliminating the need for prior illuminance setting work using a dedicated setting device or the like.

1 is an overall configuration diagram of a lighting control system according to Embodiment 1 of the present invention. It is an arrangement plan of lighting fixtures in the same lighting control system. It is a functional block diagram of a lighting fixture same as the above. It is a graph for demonstrating the light control algorithm in the control part of a lighting fixture same as the above. (A) The graph for demonstrating the control relation value used for an algorithm same as the above, (b) It is a table which shows the relationship between the light control variation | change_quantity and illuminance value variation | change_quantity used for an algorithm same as the above. It is a flowchart which shows the operation | movement procedure of a lighting control system same as the above. (A) And (b) is a graph for demonstrating the light control algorithm in the illumination control system which concerns on Embodiment 2 of this invention. (A) And (b) is a graph for demonstrating the light control algorithm in the illumination control system which concerns on Embodiment 3 of this invention. It is a functional block diagram of the lighting fixture with which the lighting control system which concerns on Embodiment 4 of this invention is provided. It is a graph for demonstrating the calculation of the light control amount of the control information generation part with which a lighting fixture same as the above is provided. It is a figure which shows the operation example of the actual light control of an illumination control system same as the above. It is a figure which shows the operation example of the other actual dimming control of an illumination control system same as the above. It is a graph for demonstrating the calculation of the light control amount of the control information generation part which concerns on the 1st modification of the illumination control system which concerns on Embodiment 4. FIG. It is explanatory drawing of the illumination control system using the conventional illumination intensity sensor.

(Embodiment 1)
FIG. 1 shows a configuration of a lighting control system 1 according to the first embodiment. The lighting control system 1 includes a transmission unit 2, a relay control terminal 3, a remote control relay 4, a remote control transformer 5, a remote control switch 6, an illuminance sensor 7, and a lighting fixture 8. The relay control terminal 3, the remote control switch 6, and the illuminance sensor 7 are connected to the transmission unit 2 via a two-wire signal line, and exchange of information with the transmission unit 2 is performed on the signal line. This is done through a transmission signal transmitted in a multiplex transmission system. The illumination control system 1 can achieve energy saving by realizing dimming control of one or a plurality of lighting fixtures 8 and automation of on / off state control using the illuminance sensor 7.

  Based on the transmission signals from the remote control switch 6 and the illuminance sensor 7, the transmission unit 2 specifies the lighting fixture 8 to be controlled from the address information included in the transmission signal, and specifies the control state for the lighting fixture 8. And the transmission unit 2 transmits the address information of the lighting fixture 8, and its control state as a control command signal with respect to the terminal 3 for relay control corresponding to the lighting fixture 8 used as control object.

  The relay control terminal 3 has a function as a load control terminal that controls the state of the lighting fixture 8 according to the control state of the relay. The relay control terminal 3 sends a control signal to the remote control relay 4 corresponding to the lighting fixture 8 to be controlled among the remote control relays 4 connected to the relay control terminal 3 based on the transmission signal from the transmission unit 2. Thus, the state of the remote control relay 4 is controlled. Each relay of the remote control relay 4 is controlled by the relay control terminal 3 to turn on / off the commercial AC from the breaker power supply (AC 100 or 200 V) 9 or the like, so that the lighting fixture 8 is turned on or off. To.

  The remote control transformer 5 supplies driving power to the relay control terminal 3 and the remote control relay 4.

  The remote control switch 6 has a function as an input terminal for outputting a control command for controlling the lighting fixture 8. Specifically, the remote control switch 6 is a terminal that is installed on, for example, an arbitrary wall such as a room and can be pushed by a user using the lighting fixture 8. In response to any of the operation switches being operated, the remote control switch 6 transmits the address information associated with the operation switch and the operation state of the operation switch to the transmission unit 2 as a control command.

  The illuminance sensor 7 is installed on a ceiling surface or the like, and detects the brightness around the detection area (detected illuminance range 100 to 2000 lux or the like). The illuminance sensor 7 illuminates so that the illuminance of the irradiated surface such as a desk is set to a constant target illuminance value, that is, the amount of incident light to the illuminance sensor 7 is constant regardless of changes in ambient brightness. It has a function of automatically adjusting the light output of the instrument 8. The “target illuminance value” is a target value of the amount of light reflected from the sensor detection range and incident on the illuminance sensor 7 installed on the ceiling surface.

  The illuminance sensor 7 is set with an individual address or a group address corresponding to the luminaire 8 in the detection space using an address setting device, and the dimming control of one or a plurality of luminaires 8 can be performed simultaneously. Based on the detected illuminance, the illuminance sensor 7 transmits a control signal including address information and control information to the transmission unit 2 via the transmission signal line in order to control the luminaire 8. Here, the user is not required to perform a setting operation for setting the correlation ratio of the illuminance between the ceiling position and the irradiated surface position in the illuminance sensor 7 in advance using a dedicated setting device or the like.

  The lighting fixture 8 present in the lighting control system 1 is a fluorescent lamp or LED lighting that can be adjusted in a stepwise fine dimming level (%) such as 0 to 100%, and is uniquely specified by a load address. can do. Specifically, a unique identifier called a load channel (Ch) is assigned to the relay control terminal 3, and a load number (Nm) is assigned to the remote control relay 4 connected to the relay control terminal 3. A unique identifier called is assigned. The load address (Ch-Nm) is configured by combining the load channel (Ch) and the load number (Nm).

  Next, a lighting apparatus incorporating a sensor unit for detecting illuminance will be described with reference to FIG. The lighting fixture 8 is attached to the ceiling of an office, etc., and each lighting fixture 8 is connected via a power supply line, and the sensor unit 81 and the control unit are individually incorporated in the lighting fixture 8. The control part with which the lighting fixture 8 is provided is accommodated in the inside of a reflecting plate, and the sensor part 81 has exposed only the front light-incidence surface from the reflecting plate outside. By incorporating the sensor unit 81 in the lighting fixture 8 in this way, a detailed lighting control system capable of controlling the brightness of each lighting fixture 8 can be obtained. For example, the influence of control of other lighting fixtures 8 by group control is considered. Dimming control is possible.

  Next, the functional configuration of the lighting fixture 8 incorporating the sensor unit 81 shown in FIG. 2 will be described with reference to FIG. The lighting fixture 8 includes a sensor unit 81 that changes an output voltage value according to brightness, a lighting circuit unit 82 that has a function of lighting the lamp 84, and a lighting circuit unit 82 that corresponds to a voltage value output from the sensor unit 81. The control part 83 which controls this light control signal, and the lamp | ramp 84 which is a light source are provided. The lighting circuit unit 82 and the control unit 83 are supplied with AC power from a commercial power source, and the sensor unit 81 is supplied with power from the control unit 83.

  The sensor unit 81 is a photodiode having a good linearity of a current value with respect to an incident light amount as a sensor element. The sensor unit 81 detects external light within the detection range, reflected light from the lamp 84, and the like, converts a current output in accordance with the voltage into a voltage value, and outputs the voltage value to the microcomputer unit 12. The brightness value (voltage value) detected by the sensor unit 81 is determined by the reflectance of the irradiated surface such as a floor surface or a desk surface directly under the sensor unit 81, and the coverage such as a floor surface or a desk surface directly under the sensor unit 81. It is proportional to the illuminance on the irradiated surface. In addition, since the sensor part 81 has finger-light property (40 degree | times etc. of all directions), it is necessary to attach toward the direction which takes light.

  For example, the lighting circuit unit 82 can dimm the lamp 84 as a light source at a dimming step (dimming level (%)) from 0% to 100%, and the PWM (Pulse) from the control unit 83 can be dimmed. With Modulation) Dimming is controlled by the duty value of the signal.

  The control unit 83 includes a power supply unit 11, a microcomputer unit 12 (hereinafter referred to as a microcomputer unit), a storage unit 13, and a dimming signal output unit 14. The output voltage value from the sensor unit 81 is input to the microcomputer unit 12, and the output of the dimming signal output unit 14 is connected to the lighting circuit unit 82.

  The power supply unit 11 has versatility that can handle, for example, an input voltage AC100V to 254V, and outputs an output voltage of 10V that is a dimming signal output voltage and 5V that is a control power supply voltage. The microcomputer unit 12 calculates the voltage value from the sensor unit 81 and controls the dimming signal so that the voltage value input from the sensor unit 81 matches the target value held by the storage unit 13. The microcomputer unit 12 includes a determination unit 15 that detects a difference between a target illuminance value set in advance or calculated by a predetermined method and a measured illuminance value measured by the sensor unit 81. Then, it is determined whether or not the difference is within an allowable range. The storage unit 13 is a memory unit that stores a target illuminance value, a luminous flux attenuation curve of the lamp 84 that changes with time, and the like. The dimming signal output unit 14 converts the dimming signal output from the microcomputer unit 12 into a predetermined voltage, and outputs the converted signal to the lighting circuit unit 82.

  The lamp 84 is a fluorescent lamp or LED lighting that can be adjusted in a stepwise fine dimming level (%) such as 0 to 100%. The LED lighting includes a dedicated driver IC having an LED element and a dimming circuit unit, and realizes a dimming function with high accuracy by PWM control or the like that changes a duty ratio (ratio between on time and off time). Note that the illuminance sensor 7 shown in FIG. 1 has a functional configuration including a sensor unit 81 and a control unit 83 in which the lighting circuit unit 82 and the lamp 84 are separated from the lighting fixture 8 shown in FIG.

  Next, an algorithm for dimming control when performing dimming control of the lighting fixture 8 will be described with reference to FIG. In FIG. 4, a curve 41 indicates a change in illuminance of the lighting fixture 8, and a curve 42 indicates a change in dimming output of the lighting fixture 8.

  The determination unit 15 detects a difference between the current illuminance value (A_0) actually detected using the sensor unit 81 and a preset target illuminance value (T), and determines whether the value is within a predetermined allowable range or out of range. judge. This allowable range is, for example, within a range of about ± 5% of the target illuminance value (T).

When the determination unit 15 determines that the value is outside the allowable range, the microcomputer unit 12 changes the dimming level at a small dimming level (%) once in a short period (t_1−t_0 in FIG. 4) as indicated by the curve 42. Dimming control is performed with an amount (ΔL_1 = L_1−L_0). The sensor unit 81 detects an illuminance value change amount before and after the change amount ΔL_1 (ΔA_1 = A_1−A_0). Further, the microcomputer unit 12 calculates the control relationship value Kn shown in FIG. 5A from the relationship between the dimming change amount ΔL_1 and the measured illuminance value change amount ΔA_1 based on, for example, the following (Equation 1). The control relation value Kn is, for example, the ratio of the illuminance value change amount measured by the sensor unit 81 to the dimming change amount of the dimming level (%).
Kn = illuminance value change amount (lx) / light control change amount (%) (Expression 1)

  Next, the microcomputer unit 12 uses the calculated control relation value Kn to control the dimming level (%) to be controlled as shown by the curve 42 from the difference between the target illuminance value and the illuminance value measured by the sensor unit 81. Dimming change amount (ΔL_2 = L_2−L_1) is calculated, and a dimming signal is generated. Then, the dimming signal output unit 14 outputs the dimming signal to the lighting circuit unit 82, and performs dimming control with the dimming change amount ΔL_2 in the period (t_2−t_1). As a result, an illuminance value change amount (ΔA_2 = A_2−A_1) is generated, and the microcomputer unit 12 repeats the same control until the measured illuminance value converges within the allowable range from the target illuminance value T, and is detected by the sensor unit 81. When the illuminance value to be set falls within the allowable range from the target illuminance value T, the dimming control is terminated.

  Specifically, as shown in FIG. 5B, when the preset target illuminance value is 750 (lx) and the current illuminance value measured by the sensor unit 81 is 550 (lx), the illuminance value The difference is 200 (lx), which is not an allowable range. For this reason, the microcomputer unit 12 first performs dimming control with a small dimming change amount (3%) once in a short period, and the sensor unit 81 performs the illuminance value change amount (30 ( lx)). Then, the control relation value Kn = 30/3 = 10 is calculated from the above (Equation 1), and in order to obtain the target illuminance value 750 (lx), in the next control, the illuminance value is the dimming change amount (17%). It is estimated that the amount of change (the amount of change of 170 (lx) is a total of 200 (lx)). Thereafter, the determination unit 15 confirms whether or not the illuminance value measured by the sensor unit 81 falls within the allowable range of the target illuminance value T, and ends the dimming control if within the allowable range.

  Next, the operation procedure of the illumination control system 1 according to the first embodiment will be described with reference to FIG. First, the determination unit 15 checks whether or not the difference between the current illuminance value and the target illuminance value is within an allowable range (S61). If the difference is within the allowable range (Yes in S61), it is not necessary to perform dimming control.

  If the difference is outside the allowable range (No in S61), the microcomputer unit 12 of the control unit 83 performs dimming control once with a small dimming control amount (%) (S62). Then, the microcomputer unit 12 calculates the control relation value Kn based on the formula 1 from the dimming control amount (%) and the illuminance value change amount (lx) measured in the sensor unit 81 (S63). The microcomputer unit 12 calculates the next dimming change amount (%) based on the control relation value Kn and the difference between the measured illuminance value measured by the sensor unit 81 and the target control value (S64). The dimming control is performed again based on the dimming change amount (%) (S65). In the light control shown in S64, the difference between the measured illuminance value and the target illuminance value already measured in S62 may be used, or after S63, the difference between the current illuminance value and the target illuminance value measured again is used. May be.

  Next, the determination unit 15 obtains the difference between the current illuminance value and the target illuminance value again, and if the difference is within the allowable range (Yes in S66), the dimming control is terminated and is outside the allowable range. In some cases (No in S66), feedback control is repeated to repeat the processing in S62 and subsequent steps.

  As described above, the illumination control system 1 according to Embodiment 1 has a relationship between the dimming change amount (%) that is the change amount of the dimming level at the first small value and the illuminance value change amount (ln). A control algorithm for calculating the control relation value Kn from the above and performing dimming control again so as to obtain the target illuminance value T is provided. For this reason, the illumination control system 1 does not require the illuminance setting work for setting the correlation between the illuminance between the floor surface and the ceiling surface as in the prior art, and the illuminance setting work even if the interior or floor layout is changed. Dimming control can be performed without carrying out the operation, and construction and energy saving can be realized.

  Further, in the control algorithm described above, since the light control is calculated using the detection value of the sensor unit 81, the change of the external light amount, the opening / closing of the blind, the lighting of the other lighting fixtures 8 by the group control, Appropriate dimming control can be realized even in an environment where the light quantity changes every moment such as turning off.

(Embodiment 2)
A lighting control system according to Embodiment 2 of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure similar to the illumination control system 1 which concerns on the said Embodiment 1, and the detailed description is abbreviate | omitted (hereinafter the same).

  In the illumination control system 1 according to the first embodiment, as shown in FIG. 7A, the illuminance value detected by the sensor unit 81 by performing dimming control of the luminaire 8 when the external light decreases. Is converged within the allowable range from the target illuminance value T. Thereafter, the target illuminance value T may change to a new target illuminance value T ′ due to a change in the amount of external light or the like. In this case, in the first embodiment, for example, the value of the control relation value Kn already acquired in the period (t_1−t_0) in the figure is used again in the period (t_4−t_3). For this reason, in the period (t_4−t_3), the illuminance value greatly changes with the same inclination as the period (t_2−t_1), and the illuminance value A_0 (lx) is significantly lower than the newly set target illuminance value T ′. It is assumed that the target illuminance value T ′ cannot be successfully converged. In such a case, the lighting fixture 8 may flicker due to an overshoot of the illuminance value.

  Therefore, in the lighting control system 1 according to the second embodiment, as shown in FIG. 7B, when the measured illuminance value converges within the allowable range from the target illuminance value using the algorithm according to the first embodiment. Once, the value of the control relation value Kn is reset. When the target illuminance value T is changed to T ′, a new control relation value Kn is calculated again based on the above algorithm. For example, in the period (t_4−t_3) in FIG. 7B, the first control relation value Kn is calculated with the dimming change amount (%) of the dimming level set to 10% of (t_2−t_1).

  As described above, in the second embodiment, the control relation value Kn is reset after the difference between the target illuminance value T and the measured illuminance value falls within the allowable range, so that the target illuminance value T becomes a new target illuminance value T. In the case of changing to ', the controlled illuminance value is not greatly deviated from the target illuminance value T'. Therefore, in this Embodiment 2, the flickering of the lighting fixture 8 by the overshoot of illumination value can be prevented.

(Embodiment 3)
An illumination control system according to Embodiment 3 of the present invention will be described with reference to FIG. In the first embodiment, after the illuminance value measured by the sensor unit 81 converges to the target illuminance value T, the control relation value Kn that has already been calculated is used as it is. The flickering of the lighting fixture 8 due to overshoot may occur.

  In the third embodiment, when the current illuminance value converges within the allowable range of the target illuminance value T and then continues within the set predetermined period, The value of the relation value Kn is reset. This is because it is assumed that the ambient environment such as outside light does not change so much within a short time after the current illuminance value converges to the target illuminance value T, and the control relation value Kn can be used as it is. Because. On the other hand, when the predetermined illuminance has elapsed since the current illuminance value converged to the target illuminance value T, it is assumed that the ambient environment such as outside light has changed, and the amount of change in light control level (%) and the illuminance value This is because it is highly possible that the correlation with the change amount (lx) has changed and the control relationship value Kn has changed.

  FIG. 8A shows a case where the current illuminance value is changed to a new target illuminance value T ′ in (t_3−t_2) in a short period D1 after the current illuminance value converges to the target illuminance value T. There is no need to reset the control relationship value Kn. On the other hand, FIG. 8B shows a case where the current illuminance value is changed to a new target illuminance value T ′ after (t_n−t_2) of D2 has elapsed for a predetermined period or more after the current illuminance value has converged to the target illuminance value T. In this case, since the change of the surrounding environment is assumed, it is necessary to reset the value of the control relation value Kn.

  As described above, in the present third embodiment, in order to prevent the control relationship value Kn from being reset or not reset based on the period after the current illuminance value converges to the allowable range of the target illuminance value T, Flickering of the lighting fixture 8 due to overshoot can be reduced. Note that it is determined not to reset or not to reset the control related value Kn based on the number of frames in which the calculation process of the dimming control is performed, not the period after the current illuminance value converges to the allowable range of the target illuminance value T. May be. Further, the present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

(Embodiment 4)
A lighting control system according to Embodiment 4 of the present invention will be described with reference to FIGS.

  The illumination control system 1 according to the first embodiment acquires a control relation value Kn that is a ratio of the dimming change amount and the illuminance value change amount at the first time of the dimming sequence, and based on the control relation value Kn, The dimming control amount of the lighting fixture is calculated so that the target illuminance is automatically reached once. However, when the surrounding environment does not change since the parameter (change rate) such as the control-related value Kn is first set, the lighting control system 1 according to the first embodiment can be appropriately applied. The surrounding environment changes. In this case, (1) there is no standard for determining the first dimming level, (2) it is difficult to determine the update timing of the control related value Kn, and (3) the degree of change in the dimming level when the control related value Kn is acquired. Adjustment is difficult. (4) If there are many control points, the memory area for storing the parameters for calculation increases. (5) If the feedback control of the illuminance of the luminaire is also implemented in the application program, the complicated processing becomes more complicated. There is a possibility of becoming.

  In particular, when the data acquisition interval of the illuminance sensor is long (for example, once every several tens of seconds), if the illuminance value once overshoots when performing automatic illuminance control, the target illuminance is reduced after the illuminance becomes brighter. Control within the range is required, and the number of times of control until the target illuminance is reached increases. For this reason, the illumination control system according to the fourth embodiment controls the illuminance value within the target illuminance range without overshooting as few times as possible when performing automatic control (feedback control).

  Next, the functional configuration of the lighting fixture 8 provided in the lighting control system according to the fourth embodiment will be described with reference to FIG. The lighting fixture 8 includes a control information generation unit 16 in addition to the configuration of the lighting fixture 8 of the first embodiment. The control information generation unit 16 generates a dimming control amount for the lamp 84 or the like using a predetermined ratio that is determined in advance within a range not exceeding the target illuminance value, assuming that the contribution of the lighting device is all of the measured illuminance value.

  Next, an algorithm for calculating the dimming control amount in the control information generation unit 16 will be described with reference to FIG. As shown in FIG. 10 (a), the values detected at arbitrary time points n and n + 1 have the following relationships (Equation 2) to (Equation 5).

An = Ae + KnLn (Expression 2)
A _{n + 1} = Ae + KnL _{n + 1} (Equation 3)
γn = Ae / An (Expression 4)
Here, if Ae at n and n + 1 does not change,
Ae = γ _{n + 1} A _{n + 1} = γnAn (Expression 5)

  In addition, Ln is a light control level (light control rate) which is a light control output value of the light control unit or communication lighting fixture in arbitrary time n. However, here, Ln ≠ 0. Kn (lx) is the degree of influence of the dimming output on the measured illuminance value of the sensor (the illuminance change amount per dimming level change amount), and is the control relation value. An (lx) is a measured illuminance value of the sensor at an arbitrary time point n. At (lx) is a target illuminance value that is illuminance to be converged by feedback control. Ae (lx) is an ambient light illuminance value that is an illuminance occupied by factors other than the target lighting fixture in the measured illuminance value of the sensor. γn is an external light rate (%) which is a ratio of Ae to An. The following (Expression 6) to (Expression 8) can be derived from the above (Expression 2) to (Expression 5).

  Here, since the external light rate γn is 0 ≦ γn <1 by definition, the relations of (Equation 9) and (Equation 10) are established at arbitrary time points n and n + 1. (Equation 9) is a case where the illuminance is increased and (Equation 10) is a case where the illuminance is controlled to decrease.

If A _{n + 1} → At, the following (Expression 11) and (Expression 12) are derived.

Therefore, even if environmental parameters such as the ambient light illuminance Ae are unknown, even if the dimming level is changed based on at least the following (Expression 13) derived from (Expression 11) and (Expression 12), excessive feedback occurs. There is nothing. This boundary value is a value when γn = 0, and is equivalent to considering that all of the measured illuminance values are due to the illuminance of the luminaire itself.
L _{n + 1} = Ln · At / An (Expression 13)

  Therefore, the control information generation unit 16 assumes that the illumination device is all of the contribution of the measured illuminance value at the next control time point n + 1, and is a predetermined ratio that is determined in advance within a range not exceeding the target illuminance value (Formula 13). ) Can be used to generate a dimming control amount for the lighting fixture.

  When the control is performed based on (Equation 13), as shown in FIG. 10B, An + 1 and γn have the following relationship (Equation 14). Therefore, it can be seen that the closer γn is to 0, that is, the greater the contribution of the measured illuminance value of the illuminating device, the greater the degree of asymptoticity to the target illuminance value at one dimming control amount.

  Next, an operation example of actual dimming control when the illumination control system according to the fourth embodiment is used will be described with reference to FIG. FIG. 11 is an operation example in the case where the measured illuminance value detected by the illuminance sensor is only the illumination of the luminaire and the outside light is small. When the dimming level is 0 (%), the illuminance is about 245 (lx) ( 15 to 30%). In FIG. 11, ◇ (111) indicates the current illuminance value (lx), Δ (112) indicates the target illuminance value (lx), and □ (113) indicates the transition of the dimming level (%) for each step. .

  Then, when dimming control is performed on the lighting fixture based on the above (Equation 13), as shown in FIG. 11, it is difficult to converge to the target illuminance value at one time in a step with a relatively large initial motion width, Is stable, and illumination control in which the illuminance value does not overshoot can be realized.

  Next, another operation example of actual dimming control when the illumination control system according to the fourth embodiment is used will be described with reference to FIG. FIG. 12 is an operation example in the case where the measured illuminance value detected by the illuminance sensor is large in outside light with illuminance other than that of the lighting fixture. When the dimming level is 0 (%), the illuminance is about 1970 (lx). (About 60 to 75%). In FIG. 12, ◇ (121) indicates the current illuminance value (lx), Δ (122) indicates the target illuminance value (lx), and □ (123) indicates the transition of the dimming level (%) for each step. .

  And if the dimming control is performed on the lighting fixture based on the above (Equation 13), the number of times of control until it converges to the target illuminance value increases because the external light is large. It can be realized by dimming control within 3 times, and the behavior of illuminance control can be made smooth overall.

  As described above, in the illumination control system according to the fourth embodiment, the control information generation unit 16 determines in advance that the illumination device is all of the contribution of the measured illuminance value and does not exceed the target illuminance value. Based on the obtained (Equation 13), a dimming control amount for the lighting fixture is generated. For this reason, when the current measured illuminance value is not within the allowable range of the target illuminance value, the dimming level is controlled based on the measured illuminance value, and the dimming control according to the lighting environment that changes in real time such as the sunshine state is performed. realizable. Moreover, since the control information generation part 16 can set the next light control amount within the range which does not exceed a target illumination value based on (Formula 13), it can suppress the overshoot of illumination intensity even if a control interval becomes long. .

  That is, in the lighting control system according to the fourth embodiment, it is not considered to converge to the target illuminance value at once by (Equation 13), and even if environmental parameters such as outside light are unknown, the dimming control amount Can be made asymptotic to the target illuminance value within a safe range that does not overshoot. For this reason, it is possible to achieve illumination control in which the first dimming control level is as large as possible, the holding parameters for illuminance feedback control are reduced, and parameters and sequences depending on time are eliminated.

  In the dimming control according to the fourth embodiment, the condition of γn = 1 is excluded. This is because γn = 1, for example, because (a) the illuminance sensor is installed outside the influence range of illumination, and (b) the luminaire is off.

  In the case of (a), no matter how the illumination is controlled, the detected illuminance of the sensor is not affected, and the feedback control loop does not end or does not start. In actual operation, such installation is not considered as not being performed. Further, in the case of (b), it becomes a problem how much the dimming level of the illumination is turned on first. As a method of determining the lighting level, for example, (1) the previous level (level before turning off) is used, (2) the light control level lower limit value or upper limit value is used (lower limit value = 0 is invalid), (3 ) In addition, there are three possible ways of calculating from some formula.

(First modification)
A first modification of the fourth embodiment will be described with reference to FIG. According to the feedback control of the illumination control system according to the fourth embodiment, the target illuminance value may not be reached by one feedback control unless the ambient light illuminance Ae = 0. Therefore, when it is desired to improve the convergence speed or to bring the target illuminance value closer to the target illuminance value by a single dimming control, it is necessary to tune the feedback control amount (the dimming control amount).

  Since it is considered that there are few cases where the ambient light illuminance Ae = 0 in the actual operating environment, the feedback control amount is basically insufficient. For this reason, although it changes so that a feedback control amount may become large, it is not desirable to overshoot a target illumination intensity value by it. Therefore, in this modified example, as shown in FIG. 13, as the specification of the illumination control system, a certain error ± ε (ε> 0) is allowed with respect to the target illuminance value. Then, feedback control is performed aiming at the allowable limit (upper limit). In FIG. 13, the upper limit of the allowable error range ± ε (for example, about ± 5%) is set as the target illuminance value based on the following (Equation 15), so that the behavior of the lighting control system does not overshoot. The accuracy of dimming control can be increased. As long as there is external light, the difference between the target illuminance value and the measured illuminance value after dimming control does not basically become zero. Therefore, in practice, accuracy or speed can be improved by feedback control according to the following (Equation 15).

  However, in this modification, a rounding error or the like of the calculated value occurs due to various restrictions, and there is a possibility that the oscillation operation may reciprocate near the boundary between the upper limit and the lower limit of the allowable error range. For this reason, it is desirable to make ε in (Equation 15) slightly smaller for mounting in the illumination control system.

(Second modification)
A second modification of the fourth embodiment will be described. When feedback dimming control is performed based on (Equation 13) of the fourth embodiment, there is no data to be held for the loop of the feedback dimming control, so there are advantages such as memory consumption reduction compared to the previous method. . However, since the convergence within one or two times is not guaranteed theoretically, when the convergence by the feedback control within the prescribed number of times is necessary, the dimming control is performed to be larger based on (Equation 13) for the first time. The next and subsequent times are dealt with by switching to the feedback control using the control relation value Kn according to the first embodiment.

  With this control, in this modification, the dimming rate is calculated in consideration of the control relation value Kn for the illuminance of the lighting device, so that accurate control can be performed and the number of times of control up to the target illuminance can be reduced, The convergence speed to the target illuminance value can be ensured. In addition, since the environmental state often does not change in a short period, unnecessary control processing can be avoided by maintaining the control-related value Kn in the storage unit for a predetermined period and not updating it.

DESCRIPTION OF SYMBOLS 1 Lighting control system 2 Transmission unit 3 Relay control terminal 4 Remote control relay 5 Remote control transformer 6 Remote control switch 7 Illuminance sensor 8 Illumination fixture 11 Power supply part 12 Microcomputer part (calculation means)
13 Storage unit (storage means)
14 Light control signal output unit 15 Determination unit (determination means)
16 Control information generation part 81 Sensor part (illuminance sensor)
82 Lighting circuit section 83 Control section 84 Lamp

Claims (5)

Illumination provided with an illuminance sensor that measures the illuminance of the illuminated surface, and a control unit that controls the light output to the luminaire so that the illuminance of the illuminated surface becomes the target illuminance value based on the output value of the illuminance sensor In the control system,
The controller is
Storage means for storing the preset target illuminance value and the measured illuminance value measured by the illuminance sensor;
A determination unit that detects a difference between the target illuminance value and the measured illuminance value and determines whether the difference is within an allowable range ;
In the determination means, when it is determined that the difference between the target illuminance value and the measured illuminance value is not within an allowable range, the luminaire is assumed to be all of the contribution to the measured illuminance value, and the target illuminance value is A lighting control system further comprising control information generating means for generating a dimming control amount for the lighting fixture using a predetermined ratio that is predetermined within a range that does not exceed the range . Wherein said control information generating means, wherein the predetermined ratio, and generates the light control level at which the dimming level so as to satisfy the condition of the following expression, the lighting control system of claim 1, wherein a.
(Equation 1)
L _{n + 1} = Ln · At / An
L _{n + 1} : Light control level at time point (n + 1) Ln: Light control level at time point n At: Target illuminance value (lx)
An: Measurement illuminance value at time n (lx) Wherein said control information generating means, wherein the predetermined ratio, and generates the light control level at which the dimming level so as to satisfy the condition of the following expression, the lighting control system of claim 1, wherein a.
(Equation 2)
L _{n + 1} = Ln · At (1 ± ε) / An
L _{n + 1} : Light control level at time point (n + 1) Ln: Light control level at time point n At: Target illuminance value (lx)
An: Measurement illuminance value at time n (lx)
ε: Percentage of error allowed for target illuminance value (lx) The control information generation unit performs dimming control processing when the determination unit determines that the difference between the measured illuminance value and the target illuminance value is within an allowable range after the control with the dimming control amount. On the other hand, if it is determined that it is not within the allowable range, the control relationship value is calculated based on the dimming change amount and the illuminance value change amount based on the previous control, and based on the control relationship value and the difference, lighting control system according to any one of claims 1 to 3 to produce a next light control level, it is characterized. 5. The illumination control system according to claim 4, wherein the control information generation unit does not update the control-related value while holding the control-related value in the storage unit for a predetermined period.