AU2021100316A4 - Equivalent Lighting Based Highway Tunnel Portal Dimming System - Google Patents
Equivalent Lighting Based Highway Tunnel Portal Dimming System Download PDFInfo
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- AU2021100316A4 AU2021100316A4 AU2021100316A AU2021100316A AU2021100316A4 AU 2021100316 A4 AU2021100316 A4 AU 2021100316A4 AU 2021100316 A AU2021100316 A AU 2021100316A AU 2021100316 A AU2021100316 A AU 2021100316A AU 2021100316 A4 AU2021100316 A4 AU 2021100316A4
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- lighting
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- 230000007704 transition Effects 0.000 claims abstract description 31
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 238000002834 transmittance Methods 0.000 claims description 25
- 239000004973 liquid crystal related substance Substances 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000004313 glare Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 241000283070 Equus zebra Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/04—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures
- F21S8/046—Lighting devices intended for fixed installation intended only for mounting on a ceiling or the like overhead structures having multiple lighting devices, e.g. connected to a common ceiling base
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
- F21V9/45—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity by adjustment of photoluminescent elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides an equivalent lighting based highway portal dimming
system, comprising a light awning disposed at the portal and an auxiliary dimming
subsystem disposed at the portal, wherein the light awning comprises rib beams of
arc-shaped structures, longitudinal beams and a ceiling, the rib beams being arranged
perpendicular to a direction in which the tunnel extends, and the longitudinal beams
being parallel to the direction in which the tunnel extends; the light awning is divided
into N sections from a direction away from the portal to a direction close to the portal,
spacing between adjacent rib beams in the same section is equal, and the spacing of
the rib beams in different sections is gradually decreased from one end away from the
portal to one end close to the portal; and the auxiliary dimming subsystem comprises
a light acquisition device disposed on the top of the lighting awning, a light diffusing
device disposed at the transition section of the tunnel, a detecting unit for detecting
tunnel parameters, and a controller unit. With the above structure, a light condition of
the light awning at the tunnel portal can be effectively adjusted in combination with
structural characteristics of the light awning, an external illumination condition and the
like, thus effectively ensuring driving safety
-1/4
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| . Ill I I I - I
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Fig 1
Description
-1/4
|| I I I I 'IIFIIW
| . Ill I I I -I
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Fig 1
Equivalent Lighting Based Highway Tunnel Portal Dimming System
The invention relates to a traffic lighting system, in particular to an
equivalent lighting based highway portal dimming system.
In highway traffic, tunnels are a common and extremely important
transportation facility. The lighting of tunnels seriously affects the safety of
road traffic.
A portal (including the exit and entrance) of the tunnel is a junction of a
dark space inside the tunnel and a bright space outside. Because of a large
difference in brightness between the inside and outside of the tunnel, there is
a huge visual bright and dark mutation when the driver enters or exits the
tunnel, namely a black-hole effect when the driver enters the tunnel and a
white-hole effect when the driver exits the tunnel during the day as well as a
white-hole effect when the driver enters the tunnel and a black-hole effect
when the driver exits the tunnel at night; and lighting at the tunnel portal
seriously affects driving safety as there is a hysteresis in human adaptation.
A light awning is provided at the portal of the tunnel for dimming so as to
help the driver to adapt to the bright and dark mutation well in the prior art.
Without considering influences on driver's vision, the light awning may still
affect driving safety.
Therefore, there is a need to propose a new system to solve the above
technical problems.
In view of this, it is the object of the invention to provide an equivalent
lighting based highway portal dimming system, which can effectively adjust a
light condition of the light awning at the tunnel portal in combination with
structural characteristics of the light awning, an external illumination condition
and the like, thus achieving uniform brightness transition, ensuring that the
driver can adapt to a lighting environment in the tunnel while entering the
portal and effectively ensuring driving safety.
The invention provides an equivalent lighting based highway portal
dimming system, including a light awning disposed at the portal and an
auxiliary dimming subsystem disposed at the portal;
the light awning includes rib beams of arc-shaped structures, longitudinal
beams and a ceiling, where the rib beams are arranged perpendicular to a
direction in which the tunnel extends, and the longitudinal beams are parallel
to the direction in which the tunnel extends; the light awning is divided into N
sections from a direction away from the portal to a direction close to the
portal, spacing between adjacent rib beams in the same section being equal,
and the spacing of the rib beams in different sections being gradually
decreased from one end away from the portal to one end close to the portal;
the auxiliary dimming subsystem includes a light acquisition device
disposed on the top of the lighting awning, a light diffusing device disposed at
the transition section of the tunnel, a detecting unit for detecting tunnel parameters, and a controller unit, where the output end of the detecting unit is connected to the input end of the controller; the controller unit adjusts an angle of the light acquisition device according to the parameters output by the detecting unit, controls light transmittance of the light diffusing device and the operation of a lighting lamp at the transition section of the tunnel, and the light acquisition device transmits light to the light diffusing device through a light guide tube.
Further, the spacing between adjacent rib beams in the same section is
determined as follows:
construct a light transmittance calculation model Ei of the light awning:
where Ei is the light transmittance of the light awning in the i-th section,
and the value of i is increased from one end away from the portal to one end
close to the portal, i being, 2..., N; H is a sun elevation angle at maximum
sunlight intensity per year, tO is the longest glare time of the driver in the
tunnel per year, fO is a road friction coefficient, S is a length of the light
awning, V is a design speed, and N is a total number of sections divided by
the light awning;
construct a light transmittance and light transmission area model of the
light awning:
Ai is an area of a light-transmitting portion at the i-th section of the light
awning, and Bi is an area of an opaque portion at the i-th section of the light
awning;
the area Ai of the light-transmitting portion at the i-th section of the light
awning is obtained from the formula (1) and the formula (2); the spacing between the adjacent rib beams at the i-th section of the light awning is obtained by dividing the area Ai of the light-transmitting portion at the i-th section of the light awning by a transverse width of the light awning.
Further, the light acquisition device includes a Fresnel lens, a light
acquisition cover, a rotatable mounting frame and a mounting base;
the light acquisition cover is fixedly disposed on the rotatable mounting
frame, the rotatable mounting frame is disposed on the mounting base, the
rotatable mounting frame is driven to rotate by a motor, the light acquisition
cover is of a funnel-shaped structure, and an expanding end of the light
acquisition cover faces towards the Fresnel lens, the Fresnel lens is fixedly
disposed at the expanding end of the light acquisition cover; the light input
end of the light guide tube is mounted at a reducing end of the light acquisition
cover, and a light reflection layer is coated on the inner side wall of the light
acquisition cover.
Further, the light diffusing device includes a light diffusing mounting
base, a light diffusing cover, a reflecting plate and a liquid crystal light valve
plate;
The light diffusing cover is of an inverted funnel-shaped structure, the
reflecting plate is fixedly disposed in the light diffusing cover, and the light
output end of the light guide tube is mounted at the reducing end of the light
diffusing cover and is opposite to the reflecting plate, a reflecting surface of
the reflecting plate is of a convex arc-surface, a light reflecting layer is coated
on the inner side wall of the light diffusing cover, and the liquid crystal light valve plate is fixedly mounted at the end part of the expanding end of the light diffusing cover, and is controlled by the controller unit.
Further, the controller unit includes a controller, a lighting drive circuit, a
rotation drive circuit, and a light valve plate drive circuit;
the control input end of the lighting drive circuit is connected to the
controller, the control end of the rotation drive circuit is connected to the
controller, the control output end of the lighting drive circuit is connected to the
control input end of the lighting lamp in the tunnel, the control output end of
the rotation drive circuit is connected to the control input end of the motor of
the light acquisition device, the signal input end of the controller is connected
to the output end of the detecting unit, the input end of the light valve plate
drive circuit is connected to the control output end of the controller, and the
output end of the light valve plate drive circuit is connected to the liquid crystal
light valve plate.
Further, the detecting unit includes a brightness sensor outside the
tunnel, a brightness sensor at the portal, a vehicle speed sensor, and a sun
height angle sensor;
the output ends of the brightness sensor outside the tunnel, the
brightness sensor at the portal, the vehicle speed sensor, and the solar height
angle sensor are all connected to the controller.
Further, the controller unit outputs a control signal as follows:
the controller obtains a brightness signal outside the tunnel, output by the
brightness sensor outside the tunnel, and calculates a brightness value L2 in the light awning according to the brightness signal outside the tunnel and the light transmittance of the light awning; the controller acquires a brightness signal of a transition section at the portal, detected by the lighting brightness sensor inside the tunnel, and obtains a brightness value Li of the transition section at the portal; when Li is greater than L2, the controller firstly outputs a control signal to the lighting drive circuit to control the lighting lamp in the transition section at the portal to reduce the lighting power. If Li is still greater than L2, a lighting tool in the transition section is turned off; when the lighting lamp is turned off and Li is greater than L2, the controller outputs a control signal to the light valve plate drive circuit to reduce the light transmittance of the liquid crystal light valve plate until Li is equal to L2; when Li is smaller than L2, the controller firstly outputs a control signal to the light valve plate drive circuit to control the liquid crystal light valve plate to increase the light transmittance. If the light transmittance of the liquid crystal light valve plate is increased to the maximum, and Li is smaller than L2, the controller outputs the control signal to the lighting drive circuit, and the lighting lamp in the transition section is controlled to increase the lighting power until
Li is equal to L2.
The invention has the beneficial effects that: according to the invention, a
light condition of the light awning at the tunnel portal can be effectively
adjusted in combination with structural characteristics of the light awning, an
external illumination condition and the like, thus achieving uniform brightness
transition, ensuring that the driver can adapt to a lighting environment in the tunnel while entering the portal and effectively ensuring driving safety. Lamp layout at the transition section of the tunnel portal can be reduced by the aid of natural light, and lighting design standards can be achieved as well as lighting quantity necessary to meet driving safety is met, thus effectively reducing energy consumption of tunnel lighting, reducing tunnel operation cost and facilitating environmental protection.
The invention is further described below in conjunction with the
accompanying drawings and embodiments:
FIG.1 is a schematic view of the structure of the invention.
FIG.2 is a schematic structural view of a light acquisition device of the
invention.
FIG.3 is a schematic structural view of a light diffusing device of the
invention.
FIG.4 is a schematic view showing an axial measurement structure of the
light awning of the invention.
FIG.5 is a block diagram showing the electrical principle of the invention.
The invention will be further described in detail below with reference to
the accompanying drawings, as shown in the drawings:
The invention provides an equivalent lighting based highway portal
dimming system, comprising a light awning disposed at an portal and an
auxiliary dimming subsystem disposed at the portal;
the light awning includes rib beams 2 of arc-shaped structures,
longitudinal beams 2 and a ceiling 7, where the rib beams 2 are arranged
perpendicular to a direction in which the tunnel extends, and the longitudinal
beams 3 are parallel to the direction in which the tunnel extends; the light
awning is divided into N sections from a direction away from the portal to a
direction close to the portal, spacing between adjacent rib beams in the same
section being equal, and the spacing of the rib beams in different sections
being gradually decreased from one end away from the portal to one end
close to the portal;
the auxiliary dimming subsystem includes a light acquisition device 1
disposed on the top of the lighting awning, a light diffusing device 4 disposed
at the transition section of the tunnel, a detecting unit for detecting tunnel
parameters, and a controller unit, where the output end of the detecting unit is
connected to the input end of the controller; the controller unit adjusts an
angle of the light acquisition device according to the parameters output by the
detecting unit, controls light transmittance of the light diffusing device and the
operation of a lighting lamp at the transition section of the tunnel, and the light
acquisition device transmits light to the light diffusing device 4 through a light
guide tube 6. The above structure can effectively adjust a light condition of the
light awning at the tunnel portal in combination with structural characteristics
of the light awning, an external illumination condition and the like, thus
achieving uniform brightness transition, ensuring that the driver can adapt to a lighting environment in the tunnel while entering the portal and effectively ensuring driving safety.
In this embodiment, the spacing between adjacent rib beams in the same
section is determined by the following method:
construct a light transmittance calculation model Ei of the light awning:
where Ei is the light transmittance of the light awning in the i-th section,
and the value of i is increased from one end away from the portal to one end
close to the portal, i being, 2..., N; H is a sun elevation angle at maximum
sunlight intensity per year, tO is the longest glare time of the driver in the
tunnel per year; According to the actual geographical location and altitude of
the tunnel and according to the existing algorithm, fO is a road friction
coefficient, S is a length of the light awning, V is a design speed, and N is a
total number of sections divided by the light awning;
construct a light transmittance and light transmission area model of the
light awning:
Ai is an area of a light-transmitting portion at the i-th section of the light
awning, and Bi is an area of an opaque portion at the i-th section of the light
awning;
the area Ai of the light-transmitting portion at the i-th section of the light
awning is obtained from the formula (1) and the formula (2);
the spacing between the adjacent rib beams at the i-th section of the light
awning is obtained by dividing the area Ai of the light-transmitting portion at
the i-th section of the light awning by a transverse width of the light awning.
By the above method, the spacing between the rib beams, which facilitates
the uniform transition of the transition section from the tunnel to the tunnel
portal, and the reasonable spacing of the rib beams arranged by the above
method can help reduce the influence of the zebra effect on the driver.
In this embodiment, the light acquisition device 1 includes a Fresnel lens
101, a light acquisition cover 102, a rotatable mounting frame 103 and a
mounting base 104;
the light acquisition cover is fixedly disposed on the rotatable mounting
frame, the rotatable mounting frame is disposed on the mounting base, the
rotatable mounting frame is driven to rotate by a motor, the light acquisition
cover is a funnel-shaped structure, and an expanding end of the light
acquisition cover faces towards the Fresnel lens, the Fresnel lens is fixedly
disposed at the expanding end of the light acquisition cover; the light input
end of the light guide tube is mounted at a reducing end of the light acquisition
cover, and a light reflection layer is coated on the inner side wall of the light
acquisition cover. With the above structure, Fresnel lens can achieve good
condensing of natural light, thereby facilitating the light guide tube to transmit
the light beam to the light diffusing device, and on the other hand, the light
acquisition cover of the above structure can effectively enhance the
condensing effect to avoid weakening of the natural light. The rotatable
mounting frame with the existing structure can be driven to rotate by the
motor, thereby realizing tracking of sunlight and ensuring that sunlight can be
vertically irradiated onto the Fresnel lens; the rotatable mounting frame can
realize integral rotation of the rotatable mounting frame by operation of a
motor-driven rotary shaft 105 disposed on the mounting base, and realizes adjustment on an angle of inclination of the Fresnel lens by rotating a motor driven rotary shaft 106 disposed on the end part at the upper end of the rotatable mounting frame, thereby realizing that the whole light acquisition cover and the Fresnel lens face towards the sunlight all the time.
In this embodiment, the light diffusing device 4 includes a light diffusing
mounting base 401, a light diffusing cover 402, a reflecting plate 404, and a
liquid crystal light valve plate 403;
The light diffusing cover is of an inverted funnel-shaped structure, and the
reducing end of the light diffusing cover is fixedly disposed on the light
diffusing mounting base, the reflecting plate is fixedly disposed in the light
diffusing cover, and the light output end of the light guide tube is mounted at
the reducing end of the light diffusing cover and opposite to the reflecting
plate, the reflecting surface of the reflecting plate is a convex arc-shaped
surface, a light reflecting layer is coated on the inner side wall of the light
diffusing cover, and the liquid crystal light valve plate is fixedly mounted on
the end part at the expanding end of the light diffusing cover and is controlled
by the controller unit. The light beam, which is transmitted to the light diffusing
device by the light guide tube, is still a concentrated beam. If it is directly
irradiated into the tunnel, strong spots will be formed, which not only will
improve integral lighting of the transition section of the tunnel, but also will
affect safe driving of the driver. Through co-action of the structures, light is
diffused and reflected into the light diffusing cover by the reflecting plate, and
is reflected to the liquid crystal light valve plate through the light diffusing
cover; and lighting brightness of the light diffusing device is adjusted by
adjusting light transmittance of the liquid crystal light valve plate, thereby achieving effect of auxiliary lighting dimming and facilitating saving energy consumption.
In this embodiment, the controller unit includes a controller, a lighting
drive circuit, a rotation drive circuit, and a light valve plate drive circuit;
the control input end of the lighting drive circuit is connected to the
controller, the control end of the rotation drive circuit is connected to the
controller, the control output end of the lighting drive circuit is connected to the
control input end of the lighting lamp in the tunnel, the control output end of
the rotation drive circuit is connected to the control input end of the motor of
the light acquisition device, the signal input end of the controller is connected
to the output end of the detecting unit, the input end of the light valve plate
drive circuit is connected to the control output end of the controller, and the
output end of the light valve plate drive circuit is connected to the liquid crystal
light valve plate, where all drive circuits are existing drive circuits and can be
directly available on the market, which will not be described herein, and the
controller is an existing single chip microcomputer.
the detecting unit includes a brightness sensor outside the tunnel, a
brightness sensor at the portal, a vehicle speed sensor, and a sun height
angle sensor;
the output ends of the brightness sensor outside the tunnel, the
brightness sensor at the portal, the vehicle speed sensor, and the solar height
angle sensor are all connected to the controller;
wherein the vehicle speed sensor is used to assist the controller to output
a control signal to the lighting drive circuit; the lighting lamp has different lighting powers in accordance with different vehicle speeds and different time periods, for example, if the vehicle speed is lower than the design speed at a morning peak, it means that the traffic flow is great and the lightning brightness needs to increase; if the vehicle speed is greater and is a designed highest speed per hour at night, it means that the traffic flow is small, and a standard lightning brightness is adopted; the sun height angle sensor is used to detect the position, at different time periods in daytime, of the sun, and the controller the solar altitude angle sensor is used to detect the position of the daytime sun at different time periods, and the controller controls the rotatable mounting frame in accordance with a position signal to make the Fresnel lens and the light acquisition cover face towards the sun, thereby realizing acquisition of natural light to the maximum extent.
In this embodiment, the controller unit controls the brightness of the
transition section between the light awning and the portal as follows:
the controller obtains a brightness signal outside the tunnel, output by the
brightness sensor outside the tunnel, and calculates a brightness value L2 in
the light awning according to the brightness signal outside the tunnel and the
light transmittance of the light awning;
the controller acquires a brightness signal of a transition section at the
portal, detected by the lighting brightness sensor inside the tunnel, and
obtains a brightness value Li of the transition section at the portal;
when Li is greater than L2, the controller firstly outputs a control signal to
the lighting drive circuit to control the lighting lamp in the transition section at the portal to reduce the lighting power. If Li is still greater than L2, a lighting tool in the transition section is turned off; when the lighting lamp is turned off and Li is greater than L2, the controller outputs a control signal to the light valve plate drive circuit to reduce the light transmittance of the liquid crystal light valve plate until Li is equal to L2; when Li is smaller than L2, the controller firstly outputs a control signal to the light valve plate drive circuit to control the liquid crystal light valve plate to increase the light transmittance. If the light transmittance of the liquid crystal light valve plate is increased to the maximum, and Li is smaller than L2, the controller outputs the control signal to the lighting drive circuit, and the lighting lamp in the transition section is controlled to increase the lighting power until
Li is equal to L2.
At last, it should be illustrated that the above embodiments are only used
to illustrate the technical schemes of the invention without limitation, although
the invention has been described in detail with reference to preferred
embodiments thereof, and ordinary people skilled in the art should understand
that modifications or equivalent substitutions can be made on the technical
schemes of the invention without departing from the spirit scope of the
technical schemes of the invention, all of which should be contained within the
scope of the claims of the invention.
Claims (7)
1. An equivalent lighting based highway portal dimming system,
characterized by comprising a light awning disposed at the portal and an
auxiliary dimming subsystem disposed at the portal, wherein the light awning
comprises rib beams of arc-shaped structures, longitudinal beams and a
ceiling, the rib beams being arranged perpendicular to a direction in which the
tunnel extends, and the longitudinal beams being parallel to the direction in
which the tunnel extends, the light awning being divided into N sections from
a direction away from the portal to a direction close to the portal, spacing
between adjacent rib beams in the same section being equal, and the spacing
of the rib beams in different sections being gradually decreased from one end
away from the portal to one end close to the portal;
the auxiliary dimming subsystem comprises a light acquisition device
disposed on the top of the lighting awning, a light diffusing device disposed at
the transition section of the tunnel, a detecting unit for detecting tunnel
parameters, and a controller unit, the output end of the detecting unit being
connected to the input end of the controller, the controller unit adjusting an
angle of the light acquisition device according to the parameters output by the
detecting unit, controlling light transmittance of the light diffusing device and
the operation of a lighting lamp at the transition section of the tunnel, and the
light acquisition device transmitting light to the light diffusing device through a
light guide tube.
2. The equivalent lighting based highway portal dimming system
according to the claim 1, wherein the spacing between adjacent rib beams in
the same section is determined as follows:
construct a light transmittance calculation model Ei of the light awning:
wherein Ei is the light transmittance of the light awning in the i-th section,
and the value of i is increased from one end away from the portal to one end
close to the portal, i being, 2..., N; H is a sun elevation angle at maximum
sunlight intensity per year, tO is the longest glare time of the driver in the
tunnel per year, fO is a road friction coefficient, S is a length of the light
awning, V is a design speed, and N is a total number of sections divided by
the light awning;
construct a light transmittance and light transmission area model of the
light awning:
wherein Ai is an area of a light-transmitting portion at the i-th section of
the light awning, and Bi is an area of an opaque portion at the i-th section of
the light awning;
the area Ai of the light-transmitting portion at the i-th section of the light
awning is obtained from the formula (1) and the formula (2);
the spacing between the adjacent rib beams at the i-th section of the light
awning is obtained by dividing the area Ai of the light-transmitting portion at
the i-th section of the light awning by a transverse width of the light awning.
3. The equivalent lighting based highway portal dimming system
according to the claim 1, wherein the light acquisition device comprises a
Fresnel lens, a light acquisition cover, a rotatable mounting frame and a
mounting base, the light acquisition cover being fixedly disposed on the
rotatable mounting frame, the rotatable mounting frame being disposed on the
mounting base, the rotatable mounting frame being driven to rotate by a
motor, the light acquisition cover being of a funnel-shaped structure, and an
expanding end of the light acquisition cover facing towards the Fresnel lens,
the Fresnel lens being fixedly disposed at the expanding end of the light
acquisition cover, the light input end of the light guide tube being mounted at a
reducing end of the light acquisition cover, and a light reflection layer being
coated on the inner side wall of the light acquisition cover.
4. The equivalent lighting based highway portal dimming system
according to the claim 1, wherein the light diffusing device comprises a light
diffusing mounting base, a light diffusing cover, a reflecting plate and a liquid
crystal light valve plate,
the light diffusing cover being of an inverted funnel-shaped structure, the
reflecting plate being fixedly disposed in the light diffusing cover, the light
output end of the light guide tube being mounted at the reducing end of the
light diffusing cover and being opposite to the reflecting plate, a reflecting
surface of the reflecting plate being of a convex arc-surface, a light reflecting
layer being coated on the inner side wall of the light diffusing cover, and the
liquid crystal light valve plate being fixedly mounted at the end part of the
expanding end of the light diffusing cover, and being controlled by the
controller unit.
5. The equivalent lighting based highway portal dimming system
according to the claim 2, wherein the controller unit comprises a controller, a
lighting drive circuit, a rotation drive circuit, and a light valve plate drive circuit,
the control input end of the lighting drive circuit being connected to the
controller, the control end of the rotation drive circuit being connected to the
controller, the control output end of the lighting drive circuit being connected
to the control input end of the lighting lamp in the tunnel, the control output
end of the rotation drive circuit being connected to the control input end of the
motor of the light acquisition device, the signal input end of the controller
being connected to the output end of the detecting unit, the input end of the
light valve plate drive circuit being connected to the control output end of the
controller, and the output end of the light valve plate drive circuit being
connected to the liquid crystal light valve plate.
6. The equivalent lighting based highway portal dimming system
according to the claim 5, wherein the detecting unit comprises a brightness
sensor outside the tunnel, a brightness sensor at the portal, a vehicle speed
sensor, and a sun height angle sensor,
the output ends of the brightness sensor outside the tunnel, the
brightness sensor at the portal, the vehicle speed sensor, and the solar height
angle sensor being all connected to the controller.
7. The equivalent lighting based highway portal dimming system
according to the claim 5, wherein the controller unit controls the brightness of
the transition section between the light awning and the portal as follows: the controller obtains a brightness signal outside the tunnel, output by the brightness sensor outside the tunnel, and calculates a brightness value L2 in the light awning according to the brightness signal outside the tunnel and the light transmittance of the light awning; the controller acquires a brightness signal of a transition section at the portal, detected by the lighting brightness sensor inside the tunnel, and obtains a brightness value Li of the transition section at the portal; when Li is greater than L2, the controller firstly outputs a control signal to the lighting drive circuit to control the lighting lamp in the transition section at the portal to reduce the lighting power. If Li is still greater than L2, a lighting tool in the transition section is turned off; when the lighting lamp is turned off and Li is greater than L2, the controller outputs a control signal to the light valve plate drive circuit to reduce the light transmittance of the liquid crystal light valve plate until Li is equal to L2; when Li is smaller than L2, the controller firstly outputs a control signal to the light valve plate drive circuit to control the liquid crystal light valve plate to increase the light transmittance. If the light transmittance of the liquid crystal light valve plate is increased to the maximum, and Li is smaller than L2, the controller outputs the control signal to the lighting drive circuit, and the lighting lamp in the transition section is controlled to increase the lighting power until
Li is equal to L2.
Fig 1 -1/4-
-2/4-
Fig 2
-3/4-
Fig 4 Fig 3
-4/4- 19 Jan 2021 2021100316
Brightness controller outside the tunnel Sun height sensor brightness sensor Controller at the portal Vehicle speed sensor
Lighting Rotation drive circuit drive circuit
Lighting Motor lamp
Fig 5
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100316A AU2021100316A4 (en) | 2021-01-19 | 2021-01-19 | Equivalent Lighting Based Highway Tunnel Portal Dimming System |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021100316A AU2021100316A4 (en) | 2021-01-19 | 2021-01-19 | Equivalent Lighting Based Highway Tunnel Portal Dimming System |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021100316A4 true AU2021100316A4 (en) | 2021-04-15 |
Family
ID=75397127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021100316A Active AU2021100316A4 (en) | 2021-01-19 | 2021-01-19 | Equivalent Lighting Based Highway Tunnel Portal Dimming System |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021100316A4 (en) |
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2021
- 2021-01-19 AU AU2021100316A patent/AU2021100316A4/en active Active
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