CN109448404A - Dysopia road vehicle warning system - Google Patents
Dysopia road vehicle warning system Download PDFInfo
- Publication number
- CN109448404A CN109448404A CN201811213740.8A CN201811213740A CN109448404A CN 109448404 A CN109448404 A CN 109448404A CN 201811213740 A CN201811213740 A CN 201811213740A CN 109448404 A CN109448404 A CN 109448404A
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- vehicle
- road
- dysopia
- led warning
- power supply
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F9/00—Arrangement of road signs or traffic signals; Arrangements for enforcing caution
- E01F9/60—Upright bodies, e.g. marker posts or bollards; Supports for road signs
- E01F9/604—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings
- E01F9/608—Upright bodies, e.g. marker posts or bollards; Supports for road signs specially adapted for particular signalling purposes, e.g. for indicating curves, road works or pedestrian crossings for guiding, warning or controlling traffic, e.g. delineator posts or milestones
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Theoretical Computer Science (AREA)
- Traffic Control Systems (AREA)
- Road Signs Or Road Markings (AREA)
Abstract
A kind of dysopia road vehicle warning system belongs to technical field of transportation, including power supply system, regulator rectifier circuit, SCM system, radar, LED warning sign, convex mirror, steering assistance traffic sign, piezoelectricity deceleration strip.Whole system is controlled by SCM system, and convex mirror, steering assistance traffic sign are set to the highlight of road vision obstacle, is equipped with bracket in road vision obstacle highlight, is installed former and later two radars, two LED warning signs on bracket.For the dysopia road in urban district, power supply system uses mains-supplied.For the dysopia road of similar mountain road, power supply system uses battery for whole system power supply.Furthermore it is also possible to install microwave antenna on bracket, communicated with there is the vehicle of vehicle condition.The present invention is arranged LED warning sign and replaces convex lens, is able to solve the convex lens display problem that information is single, sight is bad；The detection opposite side always information such as vehicle signal, speed, distance are pinpointed using radar, are able to solve the problem of convex lens can not work under bad weather and night conditions.
Description
Technical field
The present invention relates to dysopia road vehicle warning systems, belong to technical field of transportation.
Background technique
Dysopia road, especially sky way bend itself is narrow, in addition massif blocks sight, at turning
It usually will appear one section of blind area, vehicle driver, which is difficult to observe whether relative direction has, at this time carrys out vehicle, slow so as to cause meeting
Rush that the time is extremely short, and traffic accident easily occurs.Meanwhile vehicle flowrate is not under normal circumstances for the dysopia road of similar sky way
Greatly, since the devices such as dedicated powered lighting need not be arranged in objective condition limitation.Therefore, it is directed to dysopia road institute at present
The major measure taken is to set up convex lens in intersection, so that driver can see when by way of the bend to always
Vehicle.But this kind of method is clearly present following drawback: firstly, the setting of convex lens for driver, is only capable of the hair by light
It penetrates and observes opposite side always vehicle, but the information such as speed, the distance for carrying out vehicle are difficult to obtain by observation；Secondly, for night
It is significantly reduced with special circumstances, the useful effects of convex lens such as bad weathers, acquisition of this method to relative direction vehicle information at this time
With significant limitations.
Summary of the invention
In view of the defects existing in the prior art, it analyzes for these reasons, sufficiently combines dysopia road, especially disk
The characteristics of mountain highway, the present invention provides a kind of dysopia road vehicle warning systems.
It is above-mentioned in order to realize, the invention adopts the following technical scheme:
A kind of dysopia road vehicle warning system, including power supply system, regulator rectifier circuit, SCM system, thunder
Up to 2, LED warning sign 3, convex mirror 4, steering assistance traffic sign 5, piezoelectricity deceleration strip 6.Whole system is by SCM system control
System.The convex mirror 4, steering assistance traffic sign 5 are set to the highlight of road vision obstacle, prominent in road vision obstacle
Locate (such as corner) and be equipped with bracket, 2, two LED warning signs 3 of former and later two radars are installed on bracket.
The power supply system, for the dysopia road in urban district, the power supply mode of system uses mains-supplied.For
The dysopia road of similar mountain road uses battery for whole system power supply, is since inconvenience is arranged in its power supply facilities
Electric energy is utmostly collected, solar panels 1 are installed on bracket, the electric energy that solar panels 1 are collected is steady through photovoltaic power generation, rectification
Volt circuit rectified, after pressure stabilizing to charge the battery after, in addition, piezoelectric ceramics power generation sheet 8 can also charge to battery, to being
System carries out auxiliary power supply.
It is aobvious at night and bad weather effect to be able to solve convex lens by the way of radar fixed point detection for the radar 2
The problem of reducing is write, radar 2 can not only work normally under night and bad weather, and a variety of detection informations can also be provided, and can examine
It surveys whether opposite direction has carry out vehicle, carry out the information such as vehicle speed, distance, and relevant information is sent to the central processing unit of SCM system
STC89C52 is handled, and information that treated is fed back to signal warning lamp, passes through 3 alerting drivers opposite side of LED warning sign
To whether having and carry out vehicle.This mode can perceive the opposite vehicle that comes in advance and believe when driver being made to drive over dysopia road
Breath, the driving task pressure of driver, guarantee driving safety is effectively reduced.I.e. radar 2 can come detecting that relative direction has
Che Shi, while detected vehicle distance, and judge relative direction car speed.
The information of the LED warning sign 3 is shown using arrow logo in such a way that subtitle combines, when opposite direction is without coming
LED warning sign shows that green arrow mark, opposite direction have LED warning sign when carrying out vehicle to be displayed in red arrow logo when vehicle；And it will be opposite
The information such as speed, distance, type of vehicle show that this display mode can more intuitively carry out vehicle and pedestrian in LED warning sign
Warning.
The piezoelectricity deceleration strip 6 is simutaneously arranged on the dysopia road of the both direction before bend, can be to be
System provides part electric energy.The piezoelectric ceramics power generation sheet 8 of the lower arrangement V-type arrangement of the piezoelectricity deceleration strip 6, piezoelectric ceramics power generation sheet
8 connect SCM system by conducting wire.Utmostly to save power consumption, piezoelectric ceramics power generation sheet 8 is as system starting letter
Number generating device, only when vehicle crosses piezoelectricity deceleration strip 6, generates piezoelectric signal, system opens that (system is only having vehicle process
Shi Qidong).
The SCM system includes STC89C52 single chip system, transformer rectifier circuit system, and SCM system is logical
Conducting wire is crossed to connect with radar 2, LED warning sign 3, battery, solar panels 1；SCM system, piezoelectric ceramics power generation sheet 8 and storage
Battery is arranged in roadbed.
Furthermore it is also possible to install microwave antenna 7 on bracket, microwave antenna 7 is connect with SCM system by conducting wire.It is right
In there is vehicle condition vehicle, when vehicle triggering system starting, request signal is issued by microwave antenna 7, that installs on vehicle penetrates
Frequency identification transponder responds, and carries out two-way communication and data exchange, and central management system obtains vehicle identification information, such as
The information such as vehicle are shown on LED warning sign.Simultaneously in two vehicle meetings, to avoid driver from losing vigilance, it is based on car networking
Technology and sensor technology obtain ambient enviroment and information of vehicles, and are analyzed in real time, by two vehicle distances, car speed, vehicle
Type etc. passes to opposite side always vehicle.
Compared with prior art, the beneficial effects of the present invention are:
(1) present invention replaces single convex lens with LED warning sign, and LED warning sign can show arrow logo and subtitle, relatively
Direction does not carry out LED warning sign when vehicle and shows that green arrow mark, relative direction have LED warning sign when carrying out vehicle to be displayed in red arrow
Mark, and be aided with to carry out the information such as vehicle distance, speed and show, to efficiently solve, convex lens display information is single, sight is bad
Problem preferably plays a warning role dysopia road vehicle with pedestrian.
(2) present invention detects the opposite side always information such as vehicle signal, speed, distance using radar fixed point, and will be through center
Treated that information is shown by LED warning sign for processor.This mode makes driver can when driving over dysopia road
Perceive opposite direction in advance carrys out vehicle information, the driving task pressure of driver, guarantee driving safety is effectively reduced.Meanwhile
Solve the problems, such as that convex lens can not work under bad weather and night conditions.
(3) present invention is powered system using battery, in the dysopia road in similar mountain area to solve to power
The inconvenient problem of facility setting.Meanwhile being subtracted using the piezoelectricity that arrangement has generating function on solar panels and bend entranceway
Speed belt provides electric energy for system.In addition, piezoelectric ceramics power generation sheet is as system enabling signal utmostly to save power consumption
Generating device, system are only opened when there is opposed vehicle to pass through.
(4) present invention provides a kind of vehicle fortune based on radio-frequency technique and car networking technology for there is vehicle condition vehicle
Row status information detection scheme.For being equipped with the vehicle of radio-frequency identification transponder, when vehicle reaches dysopia road section
When, request signal is issued by microwave antenna, transponder responds, and carries out two-way communication and data exchange, centre management system
System obtains vehicle identification information, such as vehicle information is shown on LED warning sign, and driver is facilitated to understand opposed vehicle information.
For online vehicles, into dysopia section vehicle by vehicle to vehicle communication mode by vehicle relative distance, speed, vehicle
The information such as type pass to opponent vehicle, and driver is made to make anticipation in advance, improve driving ability, significantly reduce dysopia road
The security risk of road vehicles.With popularizing for radio-frequency technique and car networking, the present invention conforms better to following application
It needs.
Detailed description of the invention
Fig. 1 is road sections structural schematic diagram of the invention；
Fig. 2 is piezoelectric ceramics power generation sheet arragement construction schematic diagram of the invention；
Fig. 3 is system composition and structural schematic diagram of the invention；
Fig. 4 is schematic block circuit diagram of the invention
In figure: 1 solar panels, 2 radars, 3LED warning sign, 4 convex mirrors, 5 steering assistance traffic signs, 6 piezoelectricity slow down
Band, 7 microwave antennas, 8 piezoelectric ceramics power generation sheets.
Specific embodiment:
It is described further in the following with reference to the drawings and specific embodiments.
Firstly, the present invention replaces convex lens with LED warning sign to solve the problems, such as that convex lens shows that information is single, sight is bad.
The information of LED warning sign shows that using arrow logo in such a way that subtitle combines, LED warning sign is aobvious when opposite direction does not carry out vehicle
Show that green arrow identifies, opposite direction has when carrying out vehicle LED warning sign be displayed in red arrow logo, and by opposite speed, distance, vehicle class
The information such as type are shown in LED warning sign.This display mode can more intuitively warn vehicle and pedestrian.
Secondly, the present invention is pinpointed using radar to solve the problems, such as that convex lens reduces at night and bad weather significant effect
Detection.Radar can not only work normally under night and bad weather, and a variety of detection informations can also be provided, and whether can detect opposite direction
Have and carry out vehicle, carry out the information such as vehicle speed, distance, and relevant information is sent to system central processor STC89C52 single chip and is carried out
Whether processing, information that treated are fed back to signal warning lamp, are had by LED warning sign alerting drivers relative direction come vehicle.
This mode can be perceived in advance when driver being made to drive over dysopia road it is opposite carry out vehicle information, driven with being effectively reduced
The driving task pressure for the person of sailing, guarantee driving safety.
Finally, for system power supply problem, the present invention is based on two kinds of classification to provide corresponding solution.On the one hand, for
The power supply mode of the dysopia road in similar urban district, system uses mains-supplied.On the other hand, for similar mountain road
Dysopia road, since inconvenience is arranged in its power supply facilities, using storage battery power supply.Utmostly to collect electric energy, the present invention
To charge the battery using solar panels, both direction is respectively arranged the piezoelectricity deceleration for having generating function while before bend
Band provides certain electric energy for system；Utmostly to save power consumption, piezoelectric ceramics power generation sheet is sent out as system enabling signal
Generating apparatus, the system only starting when there is vehicle to pass through.
In addition, for there is vehicle condition vehicle, the present invention is based on penetrate to provide more detailed road vehicle status information
Frequency technology and car networking technology provide a kind of travel condition of vehicle infomation detection scheme.For being equipped with radio-frequency identification transponder
Vehicle, when vehicle reach dysopia road section when, request signal is issued by microwave antenna, transponder responds, and
Two-way communication and data exchange are carried out, central management system obtains vehicle identification information, such as vehicle information is on LED warning sign
Display facilitates driver to understand opposed vehicle information.For online vehicles, the vehicle into dysopia section passes through Che-vehicle
The information such as vehicle relative distance, speed, type of vehicle are passed to opponent vehicle by communication modes, make that driver in advance pre-
Sentence, improve driving ability, significantly reduces the security risk of dysopia road vehicle.
System structure of the invention is as follows:
Dysopia road vehicle warning system of the invention, as shown in attached drawing 1, Fig. 2, Fig. 3, Fig. 4, including: too
Positive energy plate 1, radar 22, LED warning sign 23, convex mirror 4, steering assistance traffic sign 5, deceleration strip 6, piezoelectric ceramics power generation
Piece 8, battery, SCM system, microwave antenna 7.
Road sections structure of the invention is as shown in Figure 1,2, the LED warning sign 23 of radar 2, deceleration strip 6, deceleration strip 6
Lower section is equipped with piezoelectric ceramics power generation sheet 8, solar panels 1, steering assistance mark 5, convex mirror 4 and microwave antenna 7.
Personnel of driving is warned in order to multi-faceted, the caution device includes LED warning sign 23, steering assistance
Traffic sign 5, convex mirror 4.
When automobile drives into from bend entrance, wheel can be pressed through successively compartment of terrain from deceleration strip 6, and piezoelectric ceramics is made to generate electricity
Piece 8 generates intermittent voltage, to trigger system.Whether 22 detection relative directions of radar, which have, is come vehicle and speed, distance,
State is shown on LED warning sign 3.So, the driver in bend the content for seeing that LED warning sign is shown will
Vigilance is generated at once, so that the vehicle to opposite avoids.
The common strip deceleration strip of the deceleration strip 6 plays decelerating effect to dysopia road vehicle is driven into.
The 8 arragement construction schematic diagram of piezoelectric ceramics power generation sheet cloth as shown in Fig. 2, piezoelectric ceramics power generation sheet 8 is in the shape of the letter V
It sets, increases arrangement areas, vehicle crosses piezoelectric ceramics power generation sheet triggering system and opens.
The radar 22 can detect relative direction have carry out vehicle when, while detected vehicle distance, and judge opposite
Direction car speed.
Whether the LED warning sign 23 have come vehicle using according to relative direction using color alerts, and relative direction, which has, to be come
Vehicle is identified with red arrow and is warned；Relative direction is identified with green arrow and is warned without vehicle is carried out.
The radio frequency that the microwave antenna 7 is installed in starting, with vehicle when vehicle drives into dysopia road triggering system
It identifies that transponder carries out two-way communication and data exchange, obtains vehicle identification information, such as vehicle, above- mentioned information are alert in LED
Show and is shown on board.
In two vehicle meetings, to avoid driver from losing vigilance, by car networking technology, by two vehicle distances, car speed,
Type of vehicle passes to relative direction vehicle, so that driver is had good judgement, consciously improves driving ability, make a policy, greatly
The security risk of dysopia road vehicle is reduced greatly.
The common convex mirror of the convex mirror 4 plays warning to the vehicle for driving into bend.
The solar panels 1 can photovoltaic power generation, by transformation, rectification, to charge the battery, to circuit system assist supply
Electricity.
8 instantaneous voltage of piezoelectric ceramics power generation sheet can reach 10~30V, show that its mean power P is about 0.495mW.
Sky way is generally two-way two lane, and Class IV highway standard can build 4.5m, and experiment measures, and arranges 120, each piezoelectricity produces
Raw power is 59.4mW, collects a small amount of electric energy.
Assembly relation of the invention is as follows:
Piezoelectric ceramics power generation sheet 8 connects SCM system by conducting wire, and the SCM system includes STC89C52 mono-
Piece machine system, transformer rectifier circuit system, SCM system connect radar 2, LED warning sign 23, battery, too by conducting wire
Positive energy plate 1, microwave antenna 7；SCM system, piezoelectric ceramics power generation sheet 8 and battery are in roadbed.
Convex mirror 4, steering assistance traffic sign 5 establish the highlight in dysopia road, and the highlight is vehicle
Enter deceleration strip 6 before, driver and passenger can be clearly seen that.
Design principle of the invention is as follows:
Opposite both direction at dysopia road, especially sky way turning places monitoring warning system respectively
System, every side control a LED warning sign.Convex mirror and steering assistance traffic sign are established into the protrusion in dysopia road
Place, driver and passenger can be clearly seen that, play forewarning function to a certain extent.Using piezoelectric ceramics power generation sheet as generating element
And system switching element, vehicle is detected with radar, after radar start work, when detecting the vehicle for driving towards turning,
System is then sent by single-chip microcontroller STC89C52 by processing result (whether have carry out vehicle, carry out vehicle speed, carry out vehicle distance), system connects
After receiving signal, control LED warning sign shows content to prompt driver to take care meeting.At turning, if opposite side
When Xiang Weiyou vehicle occurs, LED warning sign shows green arrow mark, and relative direction has when carrying out vehicle, is displayed in red arrow logo.
When piezoelectric ceramics power generation sheet triggering system is opened, microwave antenna also starts, with the radio-frequency identification transponder installed on vehicle into
Row two-way communication and data exchange obtain vehicle identification information, such as vehicle from central management system, by above- mentioned information in LED
It is shown on warning sign, while by car networking technology, two vehicle distances, car speed, type of vehicle is passed into relative direction vehicle
, so that driver is understood the information of opposite side always vehicle in time, makes anticipation in advance, make a policy.
When wherein a side has vehicle to pass through deceleration strip, pressure acts on deceleration strip side piezo-electric generating piece, single-chip microcontroller system
System is by transformer rectifier circuit, and by piezoelectric ceramics power generation sheet electricity, transformation, rectification to charge the battery and are radar, LED
Warning sign, SCM system power supply, while the electric signal that piezoelectric ceramics power generation sheet issues is as activation system.Piezoelectric ceramics power generation
Piece electricity is insufficient for system work requirements, and setting solar panels carry out collection part electric energy.
The above is the specific embodiment of the invention and the technical principle used, and conceives to be done if under this invention
Change, the spirit that the function generated is still covered without departing from specification and attached drawing, in the protection model of the invention patent
Within enclosing.
Claims (3)
1. a kind of dysopia road vehicle warning system, which is characterized in that the dysopia road vehicle warning system
Slow down including power supply system, regulator rectifier circuit, SCM system, radar (2), LED warning sign (3), convex mirror (4), piezoelectricity
Band (6)；Whole system is controlled by SCM system；The convex mirror (4) is set to the highlight of road vision obstacle, and in road
Road dysopia highlight is equipped with bracket, installs former and later two radars (2), two LED warning signs (3) on bracket；
The power supply system, for the dysopia road in urban district, the power supply mode of system uses mains-supplied；For similar
The dysopia road of mountain road uses battery for whole system power supply, installs solar panels (1) on bracket, the sun
Can plate (1) collect electric energy, rectified through photovoltaic power generation, regulator rectifier circuit, after pressure stabilizing to charge the battery after, in addition,
Piezoelectric ceramics power generation sheet (8) can also charge to battery, carry out auxiliary power supply to system；
By the way of radar fixed point detection, whether detectable opposite direction has is carried out vehicle, comes vehicle speed, distance letter the radar (2)
Breath, and relevant information is sent to SCM system and is handled, information that treated is fed back to signal warning lamp, and is passed through
Whether LED warning sign (3) alerting drivers relative direction, which has, is carried out vehicle；
The information of the LED warning sign (3) is shown using arrow logo in such a way that subtitle combines, when opposite direction does not carry out vehicle
When LED warning sign show green arrow mark, opposite direction has LED warning sign when carrying out vehicle to be displayed in red arrow logo；And by opposite vehicle
The information such as speed, distance, type of vehicle are shown in LED warning sign；
The piezoelectricity deceleration strip (6) is simutaneously arranged on the dysopia road of the both direction before bend, piezoelectricity deceleration strip
(6) piezoelectric ceramics power generation sheet (8) are arranged under, piezoelectric ceramics power generation sheet (8) connects SCM system by conducting wire；Piezoelectric ceramics hair
Electric piece (8) is used as system enabling signal generating device, and only when vehicle crosses piezoelectricity deceleration strip (6), system is opened；
The SCM system is connect by conducting wire with radar (2), LED warning sign (3), battery, solar panels (1)；It is single
Piece machine system, piezoelectric ceramics power generation sheet (8) and battery are arranged in roadbed.
2. a kind of dysopia road vehicle warning system according to claim 1, which is characterized in that can also be in bracket
Upper installation microwave antenna (7), microwave antenna (7) are connect with SCM system by conducting wire；For there is vehicle condition vehicle, work as vehicle
When triggering system starting, microwave antenna (7) issues request signal, and the radio-frequency identification transponder installed on vehicle responds,
And relevant information is shown on LED warning sign.
3. a kind of dysopia road vehicle warning system according to claim 1 or 2, which is characterized in that can be with root
Steering assistance traffic sign (5) are set according to situation, steering assistance traffic sign (5) is set to the highlight of road vision obstacle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213740.8A CN109448404A (en) | 2018-10-18 | 2018-10-18 | Dysopia road vehicle warning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213740.8A CN109448404A (en) | 2018-10-18 | 2018-10-18 | Dysopia road vehicle warning system |
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| Publication Number | Publication Date |
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| CN109448404A true CN109448404A (en) | 2019-03-08 |
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ID=65546589
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811213740.8A Pending CN109448404A (en) | 2018-10-18 | 2018-10-18 | Dysopia road vehicle warning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113920783A (en) * | 2021-10-12 | 2022-01-11 | 长沙理工大学 | Self-powered curve meeting early warning system |
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| CN201334646Y (en) * | 2008-12-30 | 2009-10-28 | 李彰晟 | Attention device for spherical road-reflecting mirror |
| JP2010065402A (en) * | 2008-09-09 | 2010-03-25 | Japan Carlit Co Ltd:The | Safety system for road and alarm method |
| CN204385643U (en) * | 2015-01-08 | 2015-06-10 | 重庆交通大学 | A kind of safety alarm device for section, sharp turn |
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2018
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055672A (en) * | 2007-05-16 | 2007-10-17 | 天津理工大学 | Vehicular real time monitoring system based on the radio RF recognition technology |
| JP2010065402A (en) * | 2008-09-09 | 2010-03-25 | Japan Carlit Co Ltd:The | Safety system for road and alarm method |
| CN201334646Y (en) * | 2008-12-30 | 2009-10-28 | 李彰晟 | Attention device for spherical road-reflecting mirror |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113920783A (en) * | 2021-10-12 | 2022-01-11 | 长沙理工大学 | Self-powered curve meeting early warning system |
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Application publication date: 20190308 |
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