JP3976667B2 - Lighting control device and lighting control system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting control device and a lighting control system that control lighting of a plurality of light emitters arranged at predetermined intervals on a road.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in the field of ITS (Intelligent Transport Systems), a line-of-sight guidance sign, a so-called delineator, for guiding a driver's line of sight at night, during rainfall, and in dense fog is known. The purpose of the delineator is to prevent traffic accidents by clearly indicating the road alignment along the side of the roadway and guiding the driver's line of sight. This delineator includes a reflection type in which illumination from a vehicle is reflected by a reflector, and a self-emission type in which light is emitted by a light emitter. In particular, the self-luminous type uses a high-luminance illuminant to improve visibility and is effective in preventing traffic accidents.
[0003]
By the way, since the field of view becomes worse at night or in dense fog, it is necessary to make the luminous body emit light with higher brightness than usual. Therefore, a self-light-emitting road sign system that changes the light emission luminance of the light emitters according to the weather conditions has been proposed. In this self-luminous road sign system, the optimum light emission luminance with a constant contrast is calculated based on the road background luminance obtained by the illuminometer, and the visibility information output from the visibility meter is calculated based on the optimum light emission luminance. Based on this, the delineator is controlled (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
WO 01/15116 Pamphlet
[0005]
[Problems to be solved by the invention]
However, in the self-luminous road sign system described in Patent Document 1, it is possible to control on / off of all the light emitters at once, but it is difficult to control on / off of each light emitter individually. Met.
[0006]
In addition, there is a system for controlling on / off of each light emitter by individually controlling the light emitter, but in such a system, the light adjustment of the light emitter has not been performed individually.
[0007]
The present invention has been made in order to solve the above-described problem. A lighting control device and a lighting control system capable of individually controlling on / off of a plurality of light emitters and controlling dimming. Is intended to provide.
[0008]
[Means for Solving the Problems]
A lighting control device according to the present invention is a lighting control device that controls lighting of a plurality of light emitters arranged at predetermined intervals on a road, A main controller, and a plurality of controllers, wherein the main controller is connected in series to the plurality of controllers, a plurality of light emitters are connected to each controller, and a weather condition detection sensor is connected to the main controller The meteorological condition detection sensor is connected and includes an illuminometer that detects illuminance in the observation area and a visibility meter that detects visibility in the observation area, and the main controller is output from the meteorological condition detection sensor A dimming control signal for controlling dimming of the light emitter based on weather conditions is output to the controller, and a serial signal for individually controlling on / off of the light emitter is output to the controller, The controller determines the serial signal according to the number of light emitters connected to the controller. The light emitter connected to the controller is dimmed by changing the duty ratio of the converted parallel signal based on the dimming control signal. is there .
[0009]
According to this configuration, A serial signal for individually controlling on / off of the light emitters is converted into a parallel signal having a number of bits corresponding to the number of light emitters connected to the controller. The on / off of a plurality of light emitters arranged on the road at predetermined intervals is individually controlled, The parallel signal converted based on the dimming control signal for controlling the dimming of the light emitter based on the weather situation output from the weather condition detection sensor By changing the duty ratio, the brightness of the plurality of light emitters can be adjusted, and on / off control and light control of the plurality of light emitters can be performed simultaneously.
[0011]
According to this configuration, a signal for individually controlling on / off of each light emitter is converted into a parallel signal parallel to each light emitter by converting a serial signal input in series on a time series. It is possible to individually control on / off of the light emitters, and since the transmitted signal is a serial signal, it is possible to transmit a long distance.
[0013]
According to this configuration, it is possible to control dimming of a plurality of light emitters according to weather conditions. For example, the light emitters are appropriately dimmed to a driver of a vehicle in a bad visibility region where visibility is impaired. By doing so, visibility is improved and it can contribute to safe driving.
[0020]
A lighting control system according to the present invention is a lighting control system that controls lighting of a plurality of light emitters arranged at predetermined intervals on each road at an intersection where one road and the other road intersect, Claims provided on said one road 1 The 1st lighting control device comprised by the lighting control device of a statement, and the claim provided in the other road 1 A second lighting control device configured by the lighting control device described above, a first luminous body group controlled by the first lighting control device, and a second controlled by the second lighting control device. The first lighting control device controls the first light emitting group according to the state of the vehicle traveling on the other road detected by the second lighting control device, and the first lighting control device The second lighting control device controls the second light emission group according to the state of the vehicle traveling on one road detected by the first lighting control device.
[0021]
According to this configuration, the first light emitter group is controlled in accordance with the state of the vehicle traveling on the other road detected by the second lighting control device, and one of the first lighting control devices detected by the first lighting control device. Since the second luminous body group is controlled according to the state of the vehicle traveling on the road, it is possible to urge the driver of the vehicle traveling on one road and the vehicle traveling on the other road to be alerted.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings. In addition, about the same structure in each figure, the same code | symbol is attached | subjected and the description is abbreviate | omitted.
[0023]
FIG. 1 is a conceptual diagram for explaining an embodiment of a road traffic system according to the present invention, and FIG. 2 is a block diagram showing an embodiment of the road traffic system according to the present invention.
[0024]
In the road traffic system 1 shown in FIG. 1, along the road side of the road 2, a weather condition detection sensor 3, a main controller 4, controllers 5a, 5b, 5c, etc., a plurality of line-of-sight guidance signs 6a, 6b, 6c, and information display A plate 7 is installed. The weather condition detection sensor 3 is connected to the main controller 4. The main controller 4 is connected in series to a plurality of controllers 5a, 5b, 5c. A plurality of gaze guidance signs 6a, 6b, 6c,... Are connected to each controller 5a, 5b, 5c... In this embodiment, 16 gaze guidance signs 6a to 6p are connected to one controller. . In FIG. 1, only the controller 5a and the line-of-sight guidance signs 6a, 6b, and 6c are illustrated.
[0025]
The meteorological condition detection sensor 3 is a sensor that detects the meteorological condition on the road 2 and includes a visibility meter 31 and an illuminometer 32 as shown in FIG. The visibility meter 31 is a weather observation instrument for measuring the concentration of suspended matters in the atmosphere by irradiating near infrared rays and measuring the brightness of the outside air. As the visibility meter 31 used in the present embodiment, there are a transmission type visibility meter and a reflection type visibility meter.
[0026]
The transmission type visibility meter measures the horizontal transmittance between two points of the concentration of minute suspended matter in the atmosphere, and obtains the visibility value based on this transmittance.
[0027]
FIG. 3 is a schematic diagram showing an example of a transmission type visibility meter. As shown in FIGS. 3 (a) and 3 (b), the transmission type visibility meter 31a has a projector 311 that emits near infrared rays, a light receiver 312 that receives near infrared rays, and a change amount of light received by the light receiver 312. A control arithmetic circuit 313 that calculates and calculates the visibility value is provided. As shown in FIG. 3 (a), in the transmissive range meter 31a, near-infrared light emitted from the projector 311 proceeds in the direction of the arrow in the figure in a state where there is no floating substance, but is received by the light receiver 312 100%. As shown in FIG. 3B, in the state where there is a suspended matter 8, near infrared rays emitted from the projector 311 are scattered by the suspended matter 8, and the light received by the light receiver 312 is attenuated and the amount of light is reduced. It uses the principle.
[0028]
On the other hand, the reflection type visibility meter measures the concentration of minute suspended matter in a limited area by a forward scattering method using scattering by floating matters in the atmosphere, and converts it to a visibility value.
[0029]
FIG. 4 is a schematic diagram showing an example of a reflective visibility meter. As shown in FIGS. 4 (a) and 4 (b), the reflection-type visibility meter 31b includes a projector 311 ′ that emits near infrared rays, a light receiver 312 ′ that receives near infrared rays, and a light amount received by the light receiver 312 ′. A control arithmetic circuit 313 ′ for calculating the amount of change and calculating the visibility value is provided. As shown in FIG. 4 (a), the reflection-type visibility meter 31b does not receive near-infrared light emitted from the projector 311 ′ in the direction of the arrow in the figure in a state where there is no floating object, and is not received by the light receiver 312 ′. Although it is 0, as shown in FIG. 4B, near-infrared light is scattered by the floating material 8 in the state where the floating material 8 is present, and a part of the near-infrared light emitted from the projector 311 ′ is transferred to the light receiver 312 ′. This is based on the principle that light is received and the amount of light increases.
[0030]
The illuminance meter 32 measures illuminance in a traveling environment such as fog and snow over the day and night. Based on the measurement data obtained by the illuminometer 32, the light emission luminance of the light emitter is controlled so as to have an appropriate contrast for the eyes of the driver.
[0031]
In the present embodiment, the weather condition detection sensor 3 is configured by the visibility meter 31 and the illuminometer 32. However, the present invention is not particularly limited to this, and the weather condition detection sensor 3 may be, for example, a wind direction / Other sensors for observing weather conditions such as an anemometer, thermometer, and hygrometer may be provided.
[0032]
1 and 2, the main controller 4 sends a dimming control signal for controlling the dimming of the light emitter based on the weather conditions output from the weather condition detection sensor 3 to the controllers 5a, 5b, 5c. And serial signals for individually controlling on / off of the light emitters are output to the controllers 5a, 5b, 5c.
[0033]
The controllers 5a, 5b, 5c,..., Which are lighting control devices, convert serial signals for individually controlling on / off of the light emitters output from the main controller 4 into parallel signals, and the duty of the converted parallel signals. The ratio is changed based on the dimming control signal, and is output to each gaze guidance sign as a drive signal.
[0034]
The line-of-sight guidance mark 6 a is a so-called delineator in which a light emitter DR <b> 1 for performing self-luminous display is provided above the column 43. The shape of the delineator in the present embodiment is, for example, a circular shape, but the present invention is not particularly limited to this, and may be another shape such as an elliptical shape or a quadrangular shape. An arrow feather display may be used. As the light emitter DR1, a light emitting diode (LED), a laser, an EL (electroluminescence), an ultraviolet (UV) lamp, an optical fiber that guides light from a light source, and the like are used. It should be noted that the light guides DR2 to DR16 are provided on the line-of-sight guide signs 6b to 6p other than the line-of-sight guide mark 6a, respectively. The controller 5a is connected to the light emitters DR1 to DR16, the controller 5b is connected to the light emitters DR17 to DR32, and the controller 5c is connected to the light emitters DR33 to DR48.
[0035]
Here, a method for controlling the light emission luminance of the light emitter by the weather condition detection sensor 3 will be described. Since the light emitters DR1 to DR48 are the same, a method for controlling the light emission luminance of the light emitter DR1 will be described below.
[0036]
First, it is necessary to set the background luminance with respect to the illuminance in advance. This background luminance is the reflection luminance of sunlight, and as an example, the white reflection luminance of snow is set. Then, based on the measurement data of the illuminometer 32, the environmental illuminance (illuminance information) is calculated. Next, the light emission luminance at which the contrast is constant with respect to the change in the background luminance is calculated. This contrast is represented by the difference or ratio between the light emission luminance of the light emitter DR1 and the background luminance, or the ratio between the difference and the background luminance. Then, at a specific point that the driver wants to visually recognize, the light emission luminance is corrected so as to have a predetermined light emission luminance based on the transmittance calculated from the measurement value obtained by the visibility meter 31. A drive signal to the light emitter DR1 is controlled so that the light emission luminance of the light emitter DR1 of the line-of-sight guidance mark 6a is set to the corrected light emission luminance.
[0037]
Thus, the optimum light emission luminance is calculated based on the illuminance information output from the illuminance meter 32 so as to obtain a constant contrast, and the visibility information output from the visibility meter 31 is calculated based on the calculated optimum light emission luminance. Because the light emitter is dimmed based on the light, the light emitter can be dimmed according to the weather conditions, and the light emitter is appropriately dimmed to the driver of the vehicle in the visibility-impaired area, improving visibility And can contribute to safe driving.
[0038]
The information display board 7 displays character information set in advance according to the traveling environment of the road 2, and displays various road information based on the weather conditions detected by the weather condition detection sensor 3. As the character information displayed on the information display board 7, for example, characters that prompt the driver to drive safely, such as “safe driving”, “traveling caution”, and “forward attention” are displayed. The information display board 7 is provided with a light emitter similar to the line-of-sight guidance sign 6a, and the display portion is dimmed based on the visibility value and the illuminance detected by the visibility meter 31 and the illumination meter 32 as described above. Is done.
[0039]
FIG. 5 is a block diagram showing an embodiment of the controller 5a. As shown in FIG. 5, the controller 5 a includes a serial / parallel converter 51 and a latch register 52. The controllers 5b, 5c,... Have the same configuration as the controller 5a and will not be described. Only the controller 5a will be described below.
[0040]
A latch signal, a synchronous clock signal, a serial signal, and an enable signal are input as input signals from the main controller 4 to the controller 5a. The serial / parallel converter 51 converts serial signals that are sequentially input into parallel signals based on the synchronous clock signal, and outputs the parallel signals to the latch register 52. The serial signal is a signal in which on / off control signals for individually controlling on / off of each light emitter are arranged in series for each light emitter, and is parallel to each light emitter in synchronization with a synchronization clock signal. Converted to a signal. In the present embodiment, the number of bits of the parallel signal converted by the serial / parallel converter 51 is 16 bits because the number of light emitters connected to the controller 5a is 16. The serial / parallel converter 51 in the present embodiment converts the serial signal into a 16-bit parallel signal. However, the present invention is not particularly limited to this, and the controller 5a, such as 8 bits, 32 bits, and 64 bits, is used. You may change suitably according to the number of the light-emitting bodies connected.
[0041]
The latch register 52 latches an input parallel signal, and holds a parallel signal for controlling on / off of each light emitter in synchronization with the latch signal. In addition, an enable signal is input to the latch register 52. The enable signal is a dimming control signal for controlling dimming of each light emitter, and controls the dimming of the light emitter by changing the duty ratio of the parallel signal input to the latch register 52.
[0042]
Next, the operation of the controller 5a will be described. First, a serial signal for controlling on / off of each light emitter is input to the serial / parallel converter 51. The serial / parallel converter 51 converts the input serial signal into a parallel signal for each light emitter in synchronization with the synchronous clock signal, and outputs the parallel signal to the latch register 52. The latch register 52 latches the input parallel signal in synchronization with the latch signal, and also changes the duty ratio of the parallel signal in a batch by the enable signal input to the output enable of the latch register 52. The parallel signal with the changed duty ratio is output to each of the light emitters DR1 to DR16.
[0043]
Here, a method for controlling the light control of the light emitter will be described. Dimming of the illuminant is performed by controlling the pulse width of a pulse signal (parallel signal) applied to the illuminant so as to obtain a predetermined light emission luminance. The pulse used is a high-speed pulse incapable of recognizing blinking by the eyes, and the power consumed by the light emitter is controlled by changing the pulse width.
[0044]
FIG. 6 is a diagram illustrating an example of a voltage waveform having a predetermined pulse width used when the light emitter is dimmed. FIGS. 6A, 6B, 6C, and 6D show pulse signal waveforms applied to the light emitter when 100%, 50%, 30%, and 0% are turned on, respectively. When the light emitter is turned on at 100%, a certain level of voltage Vd (V) is applied to the light emitter as shown in FIG. When the luminous body is turned on at 50%, as shown in FIG. 6B, the luminous body has a voltage Vd (V) such that the duty ratio D (D = B / A) is 50% (0.5). ) Is applied. When the light emitter is turned on at 30%, as shown in FIG. 6C, the light emitter has a voltage Vd (V) such that the duty ratio D (D = B / A) is 30% (0.3). ) Is applied. When the light emitter is turned on at 0%, a voltage of 0 (V) is applied to the light emitter as shown in FIG. With respect to these pulse signal waveforms, for example, when 50% is lit, one pulse may be 50%, or the total of pulses in a certain time may be 50%. Such a pulse signal waveform is not limited to the waveform shown in FIG. 6 and can be set as appropriate.
[0045]
Note that the latch signal, the synchronous clock signal, the serial signal, and the enable signal are each output to the next controller 5b, and the controller 5b performs the same operation as the controller 5a described above, and the light emitter connected to the controller 5b. Control of DR17 to DR32 is performed.
[0046]
As described above, a serial signal in which signals for individually controlling on / off of the light emitters DR1 to DR16 are serially input in time series is converted into parallel parallel signals for the light emitters DR1 to DR16. Thus, on / off of the plurality of light emitters DR1 to DR16 can be individually controlled, and a long distance can be transmitted because a transmitted signal is serial.
[0047]
In addition, all lighting to turn on all of the plurality of light emitters, all turn off to turn off all of the plurality of light emitters, blinking lighting to blink by repeating turning on and off at regular intervals, and timing of turning on and off each light emitting body It is possible to perform flow lighting or the like for lighting so as to flow by shifting.
[0048]
Further, in the latch register 52, since the duty ratio of the parallel signal for controlling on / off for each light emitter is changed in a lump, the circuit configuration can be simplified.
[0049]
In addition, a plurality of drive signals created by the serial / parallel converter 51 of the controller 5a can individually control on / off of the plurality of light emitters DR1 to DR16 arranged at predetermined intervals on the road, and a latch register. 52, the brightness of the plurality of light emitters DR1 to DR16 can be adjusted by changing the duty ratio of the drive signal, and the on / off control and the light control of the plurality of light emitters DR1 to DR16 are performed. Can be done simultaneously.
[0050]
FIG. 7 is a schematic diagram for explaining another embodiment according to the present invention. In another embodiment, as shown in FIG. 7, the presence or absence of a stop vehicle C1 on the road 2 is detected, and when there is a stop vehicle C1, other vehicles are changed by changing the light emission colors of a plurality of light emitters. Inform C2 of the presence of the stopped vehicle C1.
[0051]
A road traffic system 1 ′ according to another embodiment further includes stopped vehicle detection sensors 9a, 9b, 9c,... That detect the presence or absence of a stopped vehicle in addition to the configuration of the road traffic system 1 shown in FIG. The stop vehicle detection sensors 9a, 9b, 9c,... Are, for example, sensors that detect that the vehicle has stopped for a certain period of time, and well-known sensors are used. The stopped vehicle detection sensor 9a is provided at a position where at least a stopped vehicle existing between the light emitters DR1 to DR16 connected to the controller 5a can be detected. Similarly, the stop vehicle detection sensor 9b can detect a stop vehicle existing between the light emitters DR17 to DR32 connected to the controller 5b, and the stop vehicle detection sensor 9c is connected to the controller 5c. It is possible to detect a stopped vehicle existing between the light emitters DR33 to DR48.
[0052]
In FIG. 7, the stop vehicle detection sensor 9 b detects the presence of the stop vehicle C <b> 1, and the detected detection signal is transmitted to the main controller 4. The main controller 4 transmits to the controller 5b a light emission color change signal that changes the light emission color of the light emitters DR17 to DR32 based on the received detection signal. The controller 5b is, for example, a light emitter that is normally lit in a green light emission color. Control is performed based on the emission color change signal so that DR17 to DR32 are lit in red emission color.
[0053]
In addition, as a method of changing the light emission color of the light emitters, for example, the light emitters DR17 ′ to emit light with a light emission color different from the light emitters DR17 to DR32 at the same position as the light emitters DR17 to DR32 that emit light with a predetermined light emission color. DR32 ′ is provided, and the illuminator that emits light is switched from the illuminators DR17 to DR32 to the illuminators DR17 ′ to DR32 ′. That is, normally, the light emitting elements DR17 to DR32 that emit green light are turned on, and the emission color of the line-of-sight guidance sign is changed by switching to the light emitters DR17 ′ to DR32 ′ that emits red light by detecting a stopped vehicle.
[0054]
In this way, by changing the light emission color of the light emitters DR17 to DR32 among the light emitters DR1 to DR48, the stopped vehicle C1 is made to the light emitters DR17 to DR32 with respect to the driver of the other vehicle C2 traveling on the road 2. It is possible to notify that the vehicle is present at the position of, and contribute to the prevention of traffic accidents. In particular, when it is difficult to visually recognize a stopped vehicle at the time of heavy fog or at night, the driver can confirm the presence or absence of the stopped vehicle by a change in the emission color of the light emitter.
[0055]
FIG. 8 is a schematic diagram for explaining still another embodiment according to the present invention. In the present embodiment, at the intersection where one road and the other road intersect, it is provided on one road that there is a vehicle traveling on the other road with respect to a vehicle traveling on one road. A plurality of light emitters provided on the other road are informed by controlling lighting of the plurality of light emitters and that there is a vehicle traveling on one road with respect to a vehicle traveling on the other road. Notification is made by controlling lighting. As shown in FIG. 8, for example, at a junction where the main road 2a on an expressway and the side road 2b for entering the main road 2a merge, the side road 2b is connected to a vehicle C3 traveling on the main road 2a. The presence of the traveling vehicle C4 is notified by controlling the lighting of the light emitters DR1 to DR16. Further, the presence of a vehicle C3 traveling on the main road 2a is notified to the vehicle C4 traveling on the side road 2b by controlling lighting of the light emitters DR17 to DR32.
[0056]
The road traffic system 1 ″ in the present embodiment further includes traveling vehicle detection sensors 10a and 10b in addition to the configuration of the road traffic system 1 shown in FIG. 1. The traveling vehicle detection sensor 10a is a vehicle traveling on the main road 2a. A known sensor is used to detect C3, and the traveling vehicle detection sensor 10a outputs a detection signal to the main controller 4 when the traveling vehicle C3 is detected. Serial signals are output so that the light emitters DR17 to DR32 (second light emitter group) blink.
[0057]
Similarly, the traveling vehicle detection sensor 10b is a sensor that detects the vehicle C4 traveling on the side road 2b, and a known sensor is used. The traveling vehicle detection sensor 10b outputs a detection signal to the main controller 4 when the traveling vehicle C4 is detected. The main controller 4 outputs a serial signal to the controller 5a (first lighting control device) so as to blink the light emitters DR1 to DR16 (first light emitter group).
[0058]
As described above, the second light emitter groups DR17 to DR32 are controlled according to the state of the traveling vehicle C3 detected by the controller 5a which is the first lighting control device, and the controller 5b which is the second lighting control device. Since the first light emitter groups DR1 to DR16 are controlled according to the detected state of the traveling vehicle C4, it is possible to urge the driver of each vehicle to be alerted.
[0059]
In the present embodiment, the vehicle traveling on the main road 2a and the vehicle traveling on the side road 2b are informed that the other vehicles have entered, but the present invention is not particularly limited thereto, It may be an embodiment in which only the vehicle running on one road is notified by controlling the lighting of a plurality of light emitters provided on the other road that there is a vehicle running on the other road.
[0060]
In the present embodiment, the first light emitter groups DR1 to DR16 and the second light emitter groups DR17 to DR32 are controlled so as to blink, thereby notifying that the vehicles are running. The present invention is not particularly limited to this. For example, the light-emitting bodies of the respective line-of-sight guidance signs are arranged in an arrow shape, and there is a vehicle traveling on the other road with respect to a vehicle traveling on one road. May be notified by changing the direction of the arrow.
[0061]
Further, in the present embodiment, the lighting control of the light emitters provided on each road is assumed to be control at the junction where the main road on an expressway and the side road for entering the main road merge. However, the present invention is not particularly limited to this. For example, lighting control of light emitters provided on each road may be performed at an intersection where one road and the other road intersect, and at each intersection where a plurality of roads intersect, The lighting control of the provided light emitter may be used.
[0062]
Although the weather condition detection sensor 3 includes the visibility meter 31 in the present embodiment, the present invention is not particularly limited thereto, and the line-of-sight guidance sign 6 a may include the visibility meter 31.
[0063]
In the present embodiment, the lighting control device has been described as controlling the lighting of the light-emitting body used for the line-of-sight guidance sign, but the present invention is not particularly limited to this, for example, along the roadside line of the road and the center line. The lighting of the light emitters used for the linear pointers that are continuously installed may be controlled. In this case, the road alignment can be recognized by the driver even during heavy fog or at night, which can contribute to prevention of traffic accidents.
[0064]
Moreover, you may control lighting of the light-emitting body used for the guide light installed in the sharp curve area etc. where a road width is narrow. In this case, for example, a first vehicle detection sensor that detects the first vehicle is provided on one of a plurality of guide lights that are grounded at predetermined intervals along the road, and a second vehicle that detects the second vehicle is provided on the other side. Vehicle detection sensor. When a vehicle is detected by the first vehicle detection sensor and the second vehicle detection sensor, a detection signal is transmitted to the main controller 4, and the main controller 4 that has received the detection signal blinks the light emitter of the guide light. A serial signal to be controlled is transmitted to each controller. Each controller can prompt the driver to warn of approaching an oncoming vehicle, decelerate, and guide the line of sight by driving each light emitter to blink.
[0065]
Further, a speed detection sensor for detecting the moving speed of the vehicle may be further provided, and the light emitter may be turned on so as to flow according to the moving speed of the vehicle detected by the speed detecting sensor. For example, it is possible to reliably guide the driver's line of sight by turning on the light emitter so as to flow at a speed faster than the moving speed of the vehicle detected by the speed detection sensor.
[0066]
In addition, by using the lighting control device 1 according to the present invention on a road with poor visibility such as a curve, a driver of a vehicle traveling on the road can visually recognize the alignment of the road, which contributes to prevention of a traffic accident. Can do.
[0067]
【The invention's effect】
As described above, according to the lighting control device according to the present invention, A serial signal for individually controlling on / off of the light emitters is converted into a parallel signal having a number of bits corresponding to the number of light emitters connected to the controller. The on / off of a plurality of light emitters arranged on the road at predetermined intervals is individually controlled, The parallel signal converted based on the dimming control signal for controlling the dimming of the light emitter based on the weather situation output from the weather condition detection sensor By changing the duty ratio, the brightness of the plurality of light emitters can be adjusted, and on / off control and light control of the plurality of light emitters can be performed simultaneously.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram for explaining an embodiment of a road traffic system according to the present invention.
FIG. 2 is a block diagram showing an embodiment of a road traffic system according to the present invention.
FIG. 3 is a schematic diagram showing an embodiment of a transmission type visibility meter.
FIG. 4 is a schematic diagram showing an embodiment of a reflective visibility meter.
FIG. 5 is a block diagram showing an embodiment of a controller 5a.
FIG. 6 is a diagram showing an example of a voltage waveform having a predetermined pulse width used when dimming a light emitter.
FIG. 7 is a schematic diagram for explaining another embodiment according to the present invention.
FIG. 8 is a schematic diagram for explaining still another embodiment according to the present invention.
[Explanation of symbols]
1 Road traffic system
1a First lighting control device
1b Second lighting control device
2 roads
2a main road
2b Side road
3 weather condition detection sensor
4 Main controller
5a, 5b, 5c ... Controller (lighting control device)
6a, 6b, 6c ... Gaze guidance signs
9a, 9b, 9c ... Stop vehicle detection sensor
10a, 10b Traveling vehicle detection sensor
31 Visibility meter
31a Transmission type visibility meter
31b Reflective visibility meter
32 Illuminance meter
51 Serial / parallel converter
52 Latch register
311, 311 'Floodlight
312 and 312 ′
313,313 'control arithmetic circuit
DR1 to DR48 luminous body

Claims (2)

A lighting control device that controls lighting of a plurality of light emitters arranged at predetermined intervals on a road,
It has a main controller and multiple controllers.
The main controller is connected in series to the plurality of controllers, each controller is connected to a plurality of light emitters,
A weather condition detection sensor is connected to the main controller, and the weather condition detection sensor includes an illuminometer that detects illuminance in the observation area and a visibility meter that detects visibility in the observation area,
The main controller outputs a dimming control signal for controlling dimming of the light emitter based on the weather condition output from the weather condition detection sensor, and individually turns on / off the light emitter. A serial signal for control is output to the controller,
The controller converts the serial signal into a parallel signal having a number of bits corresponding to the number of light emitters connected to the controller, and changes the duty ratio of the converted parallel signal based on the dimming control signal. Thus, the lighting control device is configured to perform dimming of the light emitter connected to the controller. A lighting control system that controls lighting of a plurality of light emitters arranged at predetermined intervals on each road at an intersection where one road and the other road intersect,
A first lighting control device comprising the lighting control device according to claim 1 provided on the one road;
A second lighting control device comprising the lighting control device according to claim 1 provided on the other road;
A first luminous body group controlled by the first lighting control device;
A second light emitter group controlled by the second lighting control device,
The first lighting control device controls the first light emission group according to the state of the vehicle traveling on the other road detected by the second lighting control device,
The lighting control system, wherein the second lighting control device controls the second light emission group according to a state of a vehicle traveling on one road detected by the first lighting control device.

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