CN106640119B - Road tunnel passageway shading automatic regulating system - Google Patents
Road tunnel passageway shading automatic regulating system Download PDFInfo
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- CN106640119B CN106640119B CN201710148435.4A CN201710148435A CN106640119B CN 106640119 B CN106640119 B CN 106640119B CN 201710148435 A CN201710148435 A CN 201710148435A CN 106640119 B CN106640119 B CN 106640119B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000005286 illumination Methods 0.000 claims description 51
- 238000001514 detection method Methods 0.000 claims description 22
- 238000011144 upstream manufacturing Methods 0.000 claims description 15
- 239000011120 plywood Substances 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
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- 230000008450 motivation Effects 0.000 claims 1
- 206010039203 Road traffic accident Diseases 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 3
- 230000004438 eyesight Effects 0.000 description 3
- 230000004313 glare Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
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- 230000004301 light adaptation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Classifications
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- 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
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
- E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
- E06B9/26—Lamellar or like blinds, e.g. venetian blinds
- E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of road tunnel passageway shading automatic regulating systems, belong to traffic and transport field；Include the shading tent being arranged outside tunnel entrance and the control system for adjusting shading tent obscurity, the control system includes external signal collecting unit, AD conversion module, control unit, motor transmission agent.The present invention carries out automatic shading control using control system to tunnel entrance, pass through the foundation of control unit, it can be under different external light intensities and different flow speeds, enable driver's smooth transition of ambient light when coming in and going out tunnel, it realizes and the obscurity of road tunnel passageway shading tent is automatically adjusted, so as to greatly reduce road tunnel passageway traffic accident rate.
Description
Technical field
The present invention relates to traffic and transport fields, and in particular to a kind of road tunnel passageway shading automatic regulating system.
Background technology
In some mountainous regions and knob, vcehicular tunnel is wide because of the advantages that it can reduce mileage, saving fuel oil
General application.Due to the closure of highway tunnel structure, keep luminance difference inside and outside tunnel very big.When driver drives vehicle discrepancy highway
When tunnel, the illumination environment of this mutation can not be rapidly adapted to, is caused in tunnel entrance road section traffic volume Frequent Accidents.Needle at present
It is many to the method for tunnel entrance section shading facility, but majority is all fixed light shading device, it cannot be according to different outsides
The speed of wagon flow at illumination environment and entrance voluntarily adjusts obscurity.Based on this background, according to inside and outside tunnel not
Same illumination environment and flow speeds, in tunnel, entrance section provides a kind of illumination gradually gradual change adapting to Driver Vision characteristic
Auto light-shading system seems particularly necessary.
Utility model content
In order to make up the deficiency of prior art, the present invention provides a kind of road tunnel passageway shading automatic regulating system.
The technical solution adopted by the present invention is：
A kind of road tunnel passageway shading automatic regulating system, it is characterised in that：Include to be arranged in tunnel entrance
Outer shading tent and the control system for adjusting shading tent obscurity, the control system include that external signal acquisition is single
Member, AD conversion module, control unit, motor transmission agent are slidably fitted with barn door, electric-motor drive on the shading tent
System is connected with barn door control；The external signal collecting unit includes speed signal collecting unit, illumination intensity signal acquisition
Unit, speed signal collecting unit include wagon detector and the speed being connect with the signal output end of wagon detector letter
Number collecting unit, wagon detector are mounted on tunnel entrance upstream, and illumination intensity signal collecting unit includes external illuminance detection
Device, internal luminance detection device and the illumination letter being connect with the signal output end of external illuminance detector, internal luminance detection device
Number processing unit, external illuminance detector, internal luminance detection device are separately mounted in the upstream and shading tent of shading tent, speed
The signal input part of signal gathering unit, the signal output end access AD conversion module of illumination intensity signal processing unit；The control
Unit includes PLC and feedback unit, and feedback unit includes Hall sensor and the signal output end with Hall sensor
The signal blocking of connection, amplification, shaping circuit, Hall sensor are mounted on barn door, and AD conversion module and signal blocking are put
Greatly, the signal output end of shaping circuit is respectively connected to PLC, and the signal output end of PLC connects motor transmission agent；According to tunnel
Road internal and external environment illumination difference and traffic flow speed when by tunnel entrance, it is special in conjunction with driver's light vision
Property, it determines the obscurity of shading tent, related switch amount, the analog quantity of adjustment barn door position is controlled using PLC, realize
Road tunnel passageway light automatically adjusts.
A kind of road tunnel passageway shading automatic regulating system, it is characterised in that：The barn door includes
Spaced multiple top plates, multiple lower plywoods, top plate, the quantity of lower plywood are consistent, and the both sides of shading tent are additionally provided with slot
Road, the lower plywood are fixed on shading tent, and top plate is installed in the channel by roller-coaster, and the both ends of conduit are distinguished
Equipped with limited block.
A kind of road tunnel passageway shading automatic regulating system, it is characterised in that：The electric-motor drive system
System includes multiple motor, and each motor is connected to by transmission gear for electric motor on a top plate respectively, each motor point
Its corresponding top plate is not controlled to slide on conduit.
A kind of road tunnel passageway shading automatic regulating system, it is characterised in that：The interior lights are according to detection
The quantity of device is consistent with the quantity of top plate, and each internal illumination detector is separately mounted to one end that each lower plywood is located at upstream,
Vehicle is travelled to shading tent, and the inside illumination detector for being located at upstream is used as outside relative to next internal illumination detector
Illumination detector detects external luminance signal, external luminance signal that the inside illumination detector of upstream detects and next
It inside luminance signal that internal illumination detector detects while accessing illumination intensity signal processing unit and is handled.
A kind of road tunnel passageway shading automatic regulating system, it is characterised in that：The Hall sensor
Quantity is consistent with the quantity of top plate, and a Hall sensor is installed on each top plate, and Hall sensor is collected electronic
The signal of machine speed and shading Board position feeds back to PLC.
Motor quantity determines that light shielding length is determined according to actual tunnel internal and external environment according to practical light shielding length.
It is an advantage of the invention that：
The present invention carries out automatically controlling tunnel entrance shading using automatic control unit, by acquiring inside and outside tunnel
Intensity of illumination and traffic flow speed, noctovision characteristic curve bright according to driver, the illumination that control unit adjusts changeover portion are strong
Degree reduces traffic accident to which maximum possible provides optimum visual environment for driver.
Description of the drawings
Fig. 1 is the structure principle chart of the present invention.
Fig. 2 is shading tent appearance diagram.
Fig. 3 is barn door side view.
Fig. 4 is shading tent schematic diagram with an automatic light meter.
Fig. 5 is illumination intensity signal detector location figure.
Fig. 6 is system execution flow chart.
Specific implementation mode
Invention is further described in detail for the example provided below in conjunction with attached drawing.
Referring to Fig.1, a kind of road tunnel passageway shading automatic regulating system includes to be arranged outside tunnel entrance
Shading tent and control system for adjusting shading tent obscurity, control system includes external signal collecting unit 1, AD conversion
Module, control unit 3, motor transmission agent 4.
External signal collecting unit 1 includes speed signal collecting unit 5, illumination intensity signal collecting unit 6；The speed signal
Collecting unit includes wagon detector 8, speed signal processing unit 9；The illumination intensity signal collecting unit includes external illuminance inspection
Survey device 10, internal luminance detection device 11, illumination intensity signal processing unit 12.
AD conversion module uses AD converter 2.
Control unit 3 includes the PLC13 being connect with 2 output end of AD converter, signal blocking, amplification, shaping circuit 14, suddenly
That sensor 15, wherein Hall sensor 15 form feedback unit 7 with signal blocking, amplification, shaping circuit 14, and Hall is passed
The signal of 15 collected electromotor velocity of sensor and shading Board position feeds back to PLC13.
It is illustrated in figure 2 entire shading tent appearance style, shading tent includes barn door, conduit 20, and barn door includes
Spaced multiple top plates 18, multiple lower plywoods 19, top plate 18, the quantity of lower plywood 19 are consistent, and lower plywood 19 is fixed
It is arranged on shading tent, top plate 18 is slidably mounted on by idler wheel 21 in conduit 20, and the both ends of conduit 20 are respectively equipped with limit
Block 22.
If Fig. 3 is barn door pattern, it can be seen that shading tent includes limited block 22 (limitation top plate shift position), upper layer
Plate 18 (slidably), lower plywood 19 (fixed), conduit 20 and idler wheel 21.Motor 16 controls top plate 18 and moves, on
Laminate 18 can be moved back and forth by conduit 20.
Motor transmission agent 4 includes multiple motors 16, electric-motor drive device 17；Motor 16 respectively with PLC13,
Electric-motor drive device 17 connects, and each motor 16 is connected to by transmission gear for electric motor 17 on a top plate 18 respectively, respectively
Motor 16 controls its corresponding top plate 18 and is slided on conduit 20 respectively..
The quantity of internal illumination detector 11 is consistent with the quantity of top plate 18, and each internal illumination detector 18 is pacified respectively
It is located at one end of upstream mounted in each lower plywood 19, vehicle is travelled to shading tent, is located at 11 phase of inside illumination detector of upstream
External luminance signal is detected as external illumination detector for next internal illumination detector, the interior lights of upstream are according to inspection
It surveys the external luminance signal that device detects and the inside luminance signal that next internal illumination detector detects while accessing photograph
Degree signal processing unit 12 is handled.
The quantity of Hall sensor 15 is consistent with the quantity of top plate 18, and a hall sensing is installed on each top plate 18
The signal of device 15,15 collected electromotor velocity of Hall sensor and shading Board position feeds back to PLC.
As shown in figure 4, the case where figure (a) indicates the case where half shading of shading tent, and figure (b) indicates 3/4 shading of shading tent, figure
(c) the full shading of shading tent is indicated, to achieve the purpose that regulating illumination intensity.The present invention to total length be S shading tent with every Si
It is controlled for a length unit segmentation, is positioned by limited block, to prevent barn door from exceeding mobile range.
It is entire in illumination difference maximum and the maximum setting of average speed since entire shading tent total length is constant
The maximum length Smax of shading tent.Smax is determined according to the external environment in specific each tunnel.Transition is calculated according to detection data
Section S length, works as S<When Smax, brightness adjustment control is carried out according to the total length of S；Work as S>It is carried out according to the total length of Smax when Smax
Brightness adjustment control.It is no more than defined dazzle threshold range as standard using illumination inside and outside every section of shading tent so that tunnel entrance section
Illumination difference is gradually reduced.Luminance detection device is separately positioned on tunnel entrance inside and outside, as shown in Figure 5.Speed detector is distinguished
Setting is at 400 meters of tunnel entrance upstream.To ensure the illumination for the time adjustment shading tent for having sufficient, to make driver
The safety tunnel entrance under smooth illumination environment.Since the variation of terrain vehicle stream mode is system every 3 at times
Minute detection is primary, and barn door is once adjusted.
The realization principle of road tunnel passageway shading automatic regulating system of the present invention includes：
Firstly the need of the total length for determining that shading tent needs under normal circumstances.In order to adapt to most of the circumstances item
Part takes the inside and outside portion's illumination difference in tunnel maximum and Maximum speed limit Vmax is criterion, calculating shading tent according to Historical Monitoring data
Total length Smax.
Smax=VmaxT
Wherein, T is driver's glare recovery time under maximal illumination difference.
(1) driver's light and dark adaptation visual characteristic：
Lout=1KEout (1)
Lin=1KEin (2)
In formula：Lout is tunnel the luminance of outer caves, cd/m2；Lin is brightness in Tunnel, cd/m2；Eout is outside Tunnel
Illumination, lx；Ein is illumination in Tunnel, lx；K is road surface average brightness and average illumination coefficient of conversion, lx/ (cdm2), pitch
Concrete road surface takes 15-22lx/ (cdm2)；Cement concrete pavement takes 10~13lx/ (cdm2).
Existed by Li Yingtao etc.《Road tunnel passageway dim light grid section reasonable length is studied》As a result tunnel entry and exit known to
Glare recovery time is respectively：
Tin=0.0204 (Eout-Ein) 0.6031 (3)
Tout=0.0201 (Eout-Ein) 0.6012 (4)
Dazzle threshold value TI：
TI=65LoutLin100% (5)
CIE (International Commission on Illumination) recommendation is：Non- common section is 10%, and busy section is 15%.According to dazzle
Threshold value TI, determines illumination range, prevents dazzle.From formula (5)：
Lout=165TILin0.8 (6)
The outside illumination Lout, i of previous segment length Si as next segment length Si+1 internal brightness Lin, i (i=1,
2、3……n)。
The outside illumination within the scope of dazzle threshold value TI is obtained, external illuminance Eout, i (i=can be converted by formula (1)
1、2、3……n)；According to glare recovery time and by flow speeds determine the shading in this specific illumination range
The length Si (n of i=1,2,3 ...) of canopy.
(2) shading tent length is determined according to flow speeds：
In tunnel entrance, due to being influenced by factors such as speed management and control, the speed of operation of vehicle can occur certain
Variation.The maximum travel speed that motor vehicle passes through tunnel under normal circumstances is determined according to the actual conditions of route by management unit
, there is different standard of the limited speed for different road conditions.Such as highway, some are consistent with section speed limit, have
A little speed limits are that 80km/h is even lower；For urban road, 60km/h is typically limited to hereinafter, the tunnel of row may be mixed to people's vehicle
Road or bidirectional tunnel, speed limit is in 40km/h or less.For the shading facility length for the tunnel entrance that different management speeds require
There should be different standards.
Zhang Shengrui etc. is mentioned in the freeway tunnel traffic safety strategy based on speed control, in the tunnel of not speed limit
In road driving conditions, in tunnel portal section, large car velocity variations are little, and small-sized vehicle speed can mutate.Tunnel portal
Section, compact car speed difference are more than 20km/h, belong to easy hair accident section, dangerous larger.Therefore it is arranged at tunnel entrance automatic
Shade can reduce vehicle when coming in and going out tunnel, and speed is widely varied, to reduce traffic accident rate,
Increase the traffic safety at tunnel entrance.
As shown in Fig. 4 (a), due to the limitation of shading tent physical property so that vehicle is directly entered half shading of shading tent
State.So the Driver Vision of this critical section (entrance is shading tent first segment, and outlet section is shading tent final stage) returns
The multiple time calculates as follows：
Entrance：Tin, 1=0.0204 (Eout, 1-Ein, 1) 0.6031 (7)
Outlet section：Tout, n=0.0201 (Eout, n-Ein, n) 0.6012 (8)
Wherein, the n of i=1,2,3 ....
1) in the tunnel for having speed limit to require, vehicle speed before entering tunnel, which can all drop to, to be limited within speed, with limitation
Speed V is standard, and setting every section of shade length of tunnel entrance is：
Sin, i=TinV (9)
Sout, i=ToutV (10)
Wherein, the n of i=1,2,3 ..., V are the speed of entrance upstream vehicle.
Critical section shading tent length is：
Sin, 1=Tin, 1V (11)
Sout, 1=Tout, 1V (12)
It is to obtain shading tent total length at tunnel entrance：
Sin=∑s Sin, i (13)
Sout=∑s Sout, i (14)
2) in the tunnel required without speed limit, vehicle close to speed when tunnel entrance be it is uncertain, can not foundation
Velocity standard.
The speed Vt of wagon flow is obtained according to real-time velocity test, judges the length of shading tent.The every section of screening of tunnel entrance
Electro-optical device length is：
Sin, i=VtTin (15)
Sout, i=VtTout (16)
Wherein, the n of i=1,2,3 ..., Vt are the detection speed of entrance upstream vehicle.
Critical section shading tent length is：
Sin, 1=Tin, 1Vt (17)
Sout, 1=Tout, 1Vt (18)
Tunnel entrance shading tent total length is：
Sin=∑s Sin, i (19)
Sout=∑s Sout, i (20)
(3) control unit designs
Design control circuit, including power supply, signal acquisition part, signal conversion part point, detection part and feedback stage.It is logical
The design of control circuit is crossed, and then realizes the with an automatic light meter of shading tent.
Control system is mainly made of PLC, Hall sensor, signal blocking amplification and rectification circuit.Wherein pass through PLC, control
Startup, stopping and the initialization of each hardware module of motor processed.Position and speed of the system using Hall sensor measurement motor
Sensor pulse signal data are stored in PLC by degree.When shading tent moves, the signal that PLC receives Hall sensor transmission is determined
Determine the rotary state of motor.
By introducing Hall sensor in PLC, to analyze signal.The arteries and veins directly exported due to Hall sensor
It is irregular to rush signal, therefore by shaping circuit, the pulse signal blocking exported to hall device amplifies, is shaped to standard side
Wave.Then processed signal input PLC is completed into feedback.
It is as follows：
Step 1：Speed V, inside illumination Ein and external illuminance are collected respectively by external signal collecting unit
The external informations such as Eout.
Step 2：It acquires the speed signal of wagon flow and is handled.
Step 3：Collected external signal is AD converted.
Step 4：Transformed signal is input to PLC, the length Si of every section of shading tent is calculated by PLC, passes through PLC pairs
Each generator is respectively controlled.
Step 5：Judge whether the calculated shading tent total length S of detection is less than maximum length Smax, if less than according to total
Length S carries out brightness adjustment control, and brightness adjustment control is carried out according to maximum total length Smax if being not less than.
Step 6：Each unit shading Board position is detected by Hall sensor, it then will be at the signal that detected
Reason, feeds back to PLC.
Step 7：Judge whether barn door reaches designated position, the step 8 if arrival designated position is just kept straight on refers to if not reaching
Then return to step 4 are set in positioning.
Step 8：PLC carries out the initialization of modules, is transferred to step 1.
Claims (5)
1. a kind of road tunnel passageway shading automatic regulating system, it is characterised in that：Include to be arranged outside tunnel entrance
Shading tent and control system for adjusting shading tent obscurity, the control system include that external signal acquisition is single
Member, AD conversion module, control unit, motor transmission agent are slidably fitted with barn door, electric-motor drive on the shading tent
System is connected with barn door control；The external signal collecting unit includes speed signal collecting unit, illumination intensity signal acquisition
Unit, speed signal collecting unit include wagon detector and the speed being connect with the signal output end of wagon detector letter
Number collecting unit, wagon detector are mounted on tunnel entrance upstream, and illumination intensity signal collecting unit includes external illuminance detection
Device, internal luminance detection device and the illumination letter being connect with the signal output end of external illuminance detector, internal luminance detection device
Number processing unit, external illuminance detector, internal luminance detection device are separately mounted in the upstream and shading tent of shading tent, speed
The signal input part of signal gathering unit, the signal output end access AD conversion module of illumination intensity signal processing unit；The control
Unit includes PLC and feedback unit, and feedback unit includes Hall sensor and the signal output end with Hall sensor
The signal blocking of connection, amplification, shaping circuit, Hall sensor are mounted on barn door, and AD conversion module and signal blocking are put
Greatly, the signal output end of shaping circuit is respectively connected to PLC, and the signal output end of PLC connects motor transmission agent；According to tunnel
Internal and external environment illumination difference and traffic flow speed when by tunnel entrance, in conjunction with driver's light visual characteristic,
The obscurity for determining shading tent controls related switch amount, the analog quantity of adjustment barn door position using PLC, realizes public
The entrance light automatic adjustment of road tunnel.
2. a kind of road tunnel passageway shading automatic regulating system according to claim 1, it is characterised in that：The screening
Tabula rasa includes spaced multiple top plates, multiple lower plywoods, and top plate, the quantity of lower plywood are consistent, and the two of shading tent
Side is additionally provided with conduit, and the lower plywood is fixed on shading tent, and top plate is installed in the channel by roller-coaster, conduit
Both ends be respectively equipped with limited block.
3. a kind of road tunnel passageway shading automatic regulating system according to claim 2, it is characterised in that：The electricity
Motivation transmission system includes multiple motor, and each motor is connected to by transmission gear for electric motor on a top plate respectively,
Each motor controls its corresponding top plate and is slided on conduit respectively.
4. a kind of road tunnel passageway shading automatic regulating system according to claim 2, it is characterised in that：In described
The quantity of portion's luminance detection device is consistent with the quantity of top plate, and each internal luminance detection device is separately mounted to each lower plywood positioned at upper
One end of trip, vehicle are travelled to shading tent, are located at the inside luminance detection device of upstream relative to next internal luminance detection
Device detects external luminance signal as external illuminance detector, and the exterior light that the inside luminance detection device of upstream detects shines letter
Number and the inside luminance signal that detects of next internal luminance detection device while accessing illumination intensity signal processing unit and handled.
5. a kind of road tunnel passageway shading automatic regulating system according to claim 2, it is characterised in that：It is described suddenly
Your quantity of sensor is consistent with the quantity of top plate, and a Hall sensor is installed on each top plate.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107355231B (en) * | 2017-06-29 | 2019-08-27 | 西安建筑科技大学 | A kind of light adjusting system and method for the outer extended segment of tunnel portal of highway |
| CN107956479B (en) * | 2017-11-21 | 2023-11-17 | 贵阳电气控制设备有限公司 | Highway tunnel visual environment improving equipment and improving method thereof |
| CN109826642B (en) * | 2019-01-17 | 2020-05-29 | 招商局重庆交通科研设计院有限公司 | Tunnel hole external dimming method |
| CN111750299A (en) * | 2020-07-06 | 2020-10-09 | 中铁建大桥工程局集团电气化工程有限公司 | Highway tunnel vision safety guiding device |
| CN113823094B (en) * | 2021-11-17 | 2022-02-18 | 四川九通智路科技有限公司 | Tunnel real-time monitoring management system and method based on traffic flow big data |
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| CN203052515U (en) * | 2013-01-18 | 2013-07-10 | 湖南省交通科学研究院 | Tunnel natural lighting system |
| CN104864355A (en) * | 2015-05-15 | 2015-08-26 | 长安大学 | Method for achieving illumination of highway tunnel without artificial light source |
| CN206957729U (en) * | 2017-03-14 | 2018-02-02 | 合肥工业大学 | Road tunnel passageway shading automatic regulating system |
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