CN104504911B - A kind of speed measurer for motor vehicle and speed-measuring method - Google Patents
A kind of speed measurer for motor vehicle and speed-measuring method Download PDFInfo
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- CN104504911B CN104504911B CN201410802786.9A CN201410802786A CN104504911B CN 104504911 B CN104504911 B CN 104504911B CN 201410802786 A CN201410802786 A CN 201410802786A CN 104504911 B CN104504911 B CN 104504911B
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/052—Detecting movement of traffic to be counted or controlled with provision for determining speed or overspeed
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Traffic Control Systems (AREA)
Abstract
The invention discloses a kind of speed measurer for motor vehicle, including：The support bar of upper pavement surface is arranged at along road bearing of trend, support bar two ends difference fixed range sensor installs a control element in the middle of support bar；The control element controls two range sensors on its both sides and gathers its distance to the ground information between road surface along perpendicular to the direction of pavement of road respectively, and the range data signal that process is obtained is sent to the control element；The control element goes out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send, additionally, a kind of the invention also discloses motor vehicle speed measuring method.Speed measurer for motor vehicle provided by the present invention and speed-measuring method, the vehicle speed measurement of motor vehicles is realized by range sensor and control element, it is to avoid use radar installations, can avoid discovery being detected in advance by driver, and the time of testing the speed is shorter, the effect of management and control motor vehicle speed is played beneficial to which.
Description
Technical field
The present invention relates to field of traffic control, more particularly to a kind of speed measurer for motor vehicle and speed-measuring method.
Background technology
Speed measurer for motor vehicle is the road equipment of the road speed for measuring motor vehicles, and which is used for by monitor mode control
The road speed of constraint motor vehicles.
At present, speed measurer for motor vehicle mostly is radar velocity measurement device.Radar velocity measurement device is the survey based on Doppler effect
By the detecting such as such as cell phone apparatus, speed variator, the radar signal of its transmitting are easily found that driver is tended to by radar detector
Radar velocity measurement device is found in advance Deng product, causes the section motor vehicle from speeding situation for being not provided with radar velocity measurement device tight
Weight, is unfavorable for reaching the purpose of the road speed that control constrains motor vehicles.
In addition, the time of testing the speed of radar velocity measurement device generally wants 2s-3s, the time of testing the speed is longer.
In sum, a kind of speed measurer for motor vehicle avoided using radar how is provided, to play conscientiously motor vehicles survey
Management and control of the speed variator to motor line vehicle speed is acted on, and is those skilled in the art's problem demanding prompt solution.
The content of the invention
To solve above-mentioned technical problem, the invention discloses a kind of speed measurer for motor vehicle, which includes：
Support bar, is set in parallel in upper pavement surface along road bearing of trend；
Range sensor, is provided with two, is fixedly installed in support bar two ends respectively；
Control element, is fixedly mounted on the support bar between two range sensors；
Wherein, the level signal feedback for feedback level signal is additionally provided between the range sensor and control element
Line, altogether ground wire and control signal wire, under the control of the control element, edge is perpendicular to pavement of road for the range sensor
Direction gather its distance to the ground information between road surface, and the range data signal that obtains will be processed be sent to the control
Element, the control element go out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send.
Further, the range sensor includes a data acquisition portion and circuit board, and the data acquisition portion is along vertical
In the direction collection distance to the ground information on road surface, the circuit board is sent after processing to the distance to the ground information for gathering
To the control element.
Preferably, the control element controls the data acquisition portion alternation of two range sensors.
Further, the range sensor is stored with its background distance value with road surface；The range sensor is at which
The background distance value that actual range data and its of collection is stored is identical, or the difference of actual range data and background distance value
Value less than preset value when, to the control element send low level signal, both differences exceed the preset value when to
The control element sends high level signal.
Preferably, the preset value is set to less than 50cm.
Preferably, two range sensors are respectively first that the direct of travel along the motor vehicles sets gradually
Range sensor and second distance sensor；The control element is receiving the high level that first range sensor sends
Start timing during signal, and preserve time when which receives following signal successively：The height electricity that the second distance sensor sends
The time t1 of ordinary mail number, first range sensor send the time t2 and the second distance sensor of low level signal
Send time t3 during low level signal；The control element is sensed according to first range sensor and the second distance
Device the distance between D, and t1, t2, t3 calculate the average speed and accekeration of the motor vehicles.
Alternatively, two range sensors be respectively that the direct of travel along the motor vehicles sets gradually first away from
From sensor and second distance sensor；The control element is receiving the high level letter that first range sensor sends
Number when start timing, and record duration t when the second distance sensor sends high level signal, according to described the
One range sensor and the second distance sensor the distance between D, calculate the average speed of the motor vehicles.
Further, the range sensor sample frequency is 1ksps-100ksps, and sampling precision is 1cm-15cm.
Further, the length range of the support bar is 0.5m-1.2m, and the control element is single-chip microcomputer.
Based on another design of the present invention, a kind of motor vehicle speed measuring side for above-mentioned speed measurer for motor vehicle is also provided
Method, which comprises the steps：
A support bar be arranged in parallel in upper pavement surface along road bearing of trend, range sensor is respectively mounted in support bar two
End, also installs a control element in the middle of support bar；
Two range sensors receive the control command of the control element, alternately along perpendicular to the side of pavement of road
To its distance to the ground information between road surface of collection, and the range data signal that process is obtained is sent to into the control unit
Part；
The control element goes out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send.
Compared with prior art, speed measurer for motor vehicle provided by the present invention and speed-measuring method, by range sensor
The vehicle speed measurement of motor vehicles is realized with control element, it is to avoid use radar installations, can avoid being detected by driver in advance and send out
It is existing, and the time of testing the speed is shorter, plays the effect of management and control motor vehicle speed beneficial to which.
Description of the drawings
Fig. 1 is the main structure diagram of the speed measuring device of motor vehicles provided in an embodiment of the present invention；
Fig. 2 is the overlooking the structure diagram of the speed measuring device of motor vehicles provided in an embodiment of the present invention；
Wherein, each reference is as follows：
100- range sensors；101- circuit boards；102- shells；103- signal projectors；104- signal receivers；105-
Control signal wire；107-106- level signal feedback lines；Common ground wire；200- control elements；300- support bars.
Specific embodiment
Following examples are only used for clearly illustrating technical scheme, and can not limit the present invention with this
Protection domain.As in description and claim some vocabulary used in censuring particular elements.People in the art
Member is, it is to be appreciated that hardware manufacturer may call same part with different nouns.This specification and claims are not
In the way of the difference of title is used as distinguishing part, but the difference with part functionally is used as the criterion distinguished.Say
Bright book subsequent descriptions are to implement the better embodiment of the present invention, and so description is to illustrate this new rule as mesh
, it is not limited to the scope of the present invention.Protection scope of the present invention ought be defined depending on the defined person of claims.
The present invention is described in further details with specific embodiment below in conjunction with the accompanying drawings.
Referring to the drawings 1, a kind of speed measurer for motor vehicle disclosed in the embodiment of the present invention, including：Support bar 300, control
Element 200 and range sensor 100, wherein, support bar 300 is arranged on upper pavement surface along the bearing of trend of road；Control element
200 are fixed on support bar 300；Range sensor is provided with 2, is separately fixed at 300 two ends of support bar；Specifically, the survey
In speed variator, the level signal feedback line for feedback level signal between range sensor 100 and control element 200, is additionally provided with
106th, common ground wire 107 and control signal wire 105.
Under the control of control element 200, edge gathers described two range sensors 100 perpendicular to the direction of pavement of road
Its distance to the ground information between road surface, and the range data signal that process is obtained is sent to into the control element 200；Control
The velocity amplitude of the range data signal of change motor vehicles that element processed 200 is sent according to two range sensors 100.
The speed measuring device of motor vehicles provided in an embodiment of the present invention passes through range sensor 100 and control element 200 is realized
The speed of measurement motor vehicles, it is to avoid use radar installations, can avoid being detected discoverys in advance by driver, manages beneficial to its performance
The effect of control motor vehicle speed.
Specifically, above-mentioned support bar 300 is arranged on above road with the state parallel to the road surface of road, is be arranged in parallel,
Certainty of measurement is higher.
In the speed measuring device that above-described embodiment is provided, range sensor 100 includes adopting perpendicular to the direction on road surface for edge
The data acquisition portion of collection distance to the ground information, and for process distance to the ground information that above-mentioned data acquisition portion gathered and
The range data information that process is obtained is sent to into the circuit board 101 of control element 200.The range sensor 100 also includes
One shell 102, data acquisition portion and circuit board 101 are arranged in shell 102；The data acquisition portion bag of range sensor 100
The signal projector 103 and signal receiver 104 being connected with circuit board 101 respectively is included, signal projector 103 is sent out to road surface in real time
The number of delivering letters, the signal that 104 real-time reception of signal receiver is returned from ground.
Due to data acquisition portion need to towards ground sending signal and receive by ground return signal, in order to avoid two away from
Data acquisition portion transmission signal and the echo-signal for receiving from sensor 100 is interfered, and above-mentioned control element 200 is controlled
The data acquisition portion alternation of two range sensors 100 of system.If collection period is two range sensors 100 of 100us,
Both are respectively first range sensor and second distance sensor of the travel direction setting along vehicle, and control element 200 is controlled
The data acquisition portion for making the first range sensor is sent and received signal in front half period；To after 50us, first distance
The data acquisition portion of sensor 100 sends and receives signal and completes, the 101 start to process number of circuit board of first range sensor
According to the distance to the ground information that collection portion gathers, meanwhile, control element 200 controls the data acquisition of second range sensor 100
Portion sends and receives signal；After 50us, the circuit board 101 of the first range sensor obtains range data letter through data processing
Control element 200 is ceased and sends that information to, control element 200 controls the data acquisition portion of the first range sensor and enters again
The data collection task that row sends and receives signal, meanwhile, the data acquisition portion of second distance sensor sends and receives signal
Complete, and the distance to the ground information that its data acquisition portion of 101 start to process of circuit board of second distance sensor gathers；So
Above-mentioned steps repeatedly again after 50us, 2 alternately data collection tasks of range sensor 100.
Specifically, in above-mentioned speed measuring device, 2 range sensors 100 preserve background distance value respectively (does not have vehicle
Distance to the ground value by the case of), both respectively by transmitting the form of high and low level to control to control element 200
Whether element 200 reacts has automobile below.In order to avoid foreign body (toy such as run) the triggering range sensor on road surface
100 pass on lower section to have the error message that automobile passes through to control element 200, and above-mentioned range sensor 100 is preferably arranged at which
When the difference of the background distance value that the distance for measuring is preserved with which is less than preset value, remains to control element 200 and transmit
Representative does not have the low level signal that automobile passes through, and the actual range data gathered at which when the range sensor are stored with which
When the background distance value is identical, low level signal is also sent.Specifically, as the minimum point vertically of vehicle body is general
50cm higher than ground, above-mentioned preset value may be configured as, less than 50cm, being preferably arranged to 30cm.
In the speed measuring device that above-described embodiment is provided, control element 200 can measure car by the way of measurement average speed
Distance to the ground data message that speed, such as range sensor 100 are measured at which is background distance value or the difference with background distance value
During less than preset value, low level signal is sent to control element 200；Headstock reach the first range sensor below when, first away from
High level signal is sent to control element 200 from sensor, control element 200 starts meter when above-mentioned high level signal is received
When；When headstock is reached below second distance sensor, second distance sensor sends high level signal, control to control element 200
Element processed 200 preserves corresponding timing time t, then using first range sensor 100 and second range sensor 100
The average speed of automobile is obtained divided by the computing mode of above-mentioned time t apart from D.
Although above-mentioned method of testing can calculate the average speed of motor vehicles, this cannot react accurate response car
Speed and acceleration, therefore preferably, above-mentioned control element 200 is set to speed and the acceleration for obtaining automobile in the following way
Degree, to obtain more accurate measurement：
When the headstock of motor vehicles reaches the lower section of the first range sensor, the first range sensor is found range to be become from generation
Change, which produces high level signal, and feeds back to control element 200 by level signal feedback line 106, and control element 200 starts
Timing.
When headstock reaches the lower section of second distance sensor, second distance sensor is found range from also changing, its
High level signal is produced, and control element 200 is fed back to by its level signal feedback line 106, control element 200 is preserved now
Time counting value t1, and continue timing.
When the tailstock leaves the lower section of the first range sensor, the first range sensor is found range from being returned to the previous back of the body
Scape value is less than preset value with the difference of background value, and the first range sensor becomes generation low level letter again by high level signal is produced
Number, and sending the low level signal to control element 200, control element 200 preserves time counting value t2 now, and continues
Timing.
When the tailstock leaves the lower section of second distance sensor, second distance sensor is found range from being returned to the previous back of the body
Scape value is less than preset value with the difference of background value, and second distance sensor becomes generation low level letter again by high level signal is produced
Number, and sending the low level signal to control element 200, control element 200 preserves time counting value t3 now, timing knot
Beam.
Above-mentioned control element 200 is according to above-mentioned clocking value t1, t2, t3, and the horizontal range of two range sensors 100
D, can obtain the average speed operational formula (4) of automobile with reference to following kinesiology fundamental formular (1), (2) and (3) and accelerate
The operational formula (5) of degree：
Instantaneous velocity vt=v0+at………………(1)
The motor vehicles obtained by above-mentioned calculation can accurately reflect motor vehicles average speed and acceleration magnitude, this
Outward, in above-mentioned speed measuring device, common ground wire 107 is additionally provided between range sensor 100 and control element 200 and for circuit board
The control signal wire 105 communicated between 101 and control element 200.
Specifically, above-described embodiment provide speed measuring device in, described two range sensors be same model, parameter phase
Same range sensor, so ensure that its transfer rate, and frequency acquisition is in the same size, certainly, above-mentioned two Distance-sensing
Device is alternatively the range sensor of different parameters, and the control element may be disposed at any suitable location on support bar, or not
Be installed on the support bar, be arranged on outside support bar, in principle the control element be at receive it is described two away from
Carry out in the range of signal transmission from sensor.
Specifically, in the speed measuring device that above-described embodiment is provided, it is 1ksps- that range sensor 100 is sample frequency
The high speed range sensor of 100ksps, its sampling precision are 1cm-15cm.
In addition, in above-mentioned speed measuring device, the length range of support bar 300 is 0.5m-1.2m, accordingly, is fixed on support
Horizontal range D of two range sensors 100 at 300 two ends of bar is 1m or so.
Speed measuring device provided in an embodiment of the present invention also has the time of testing the speed short, it is adaptable to which vehicle flowrate is big, the road that speed is fast
The characteristics of face.Passed with the high speed distance for sample frequency being 10ksps (measuring once distance of reaction over the ground in 0.0001 second) below
The speed measuring device of sensor 100 specifically introduce by taking the speed of the car of the 4.8m length in 60km/h travelings as an example by detection, running car
1.6mm (spacing of two range sensors 100) then triggers whole speed measuring device immediately, and 1.6mm is for whole rate results
Measurement does not affect substantially, and car is reached below the first range sensor from headstock, leaves second distance sensor to the tailstock
Lower section, (control element can be ignored substantially to the calculating time of speed), whole process takes less than 0.4 second.
Specifically, in the speed measuring device that above-described embodiment is provided, control element 200 is single-chip microcomputer, and the single-chip microcomputer is 51
Series A T89C2051 chips.Certainly, above-mentioned control element 200 can also adopt other PLC technology element chips, here not to make
Any restriction.
Based on another design of the present invention, a kind of motor vehicle speed measuring side for above-mentioned speed measurer for motor vehicle is also provided
Method, the method comprise the steps：
A support bar be arranged in parallel in upper pavement surface along road bearing of trend, range sensor is respectively mounted in support bar two
End, also installs a control element in the middle of support bar；It is additionally provided with for feedback level between the range sensor and control element
The level signal feedback line of signal, altogether ground wire and control signal wire.
Two range sensors receive the control command of the control element, alternately along perpendicular to the side of pavement of road
To its distance to the ground information between road surface of collection, and the range data signal that process is obtained is sent to into the control unit
Part；
The control element goes out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send,
Its computational methods is identical with the method used in above-mentioned measurement apparatus, and here no longer elaborates.
The speed-measuring method has certainty of measurement high, and avoids the advantage using radar, it is easy to accomplish, can be widely applied to existing
For in motor vehicle speed monitoring field.
It should be noted that the foregoing is only presently preferred embodiments of the present invention, the patent of the present invention is not thereby limited
Protection domain, the present invention can also carry out the improvement of material and structure to the construction of above-mentioned various parts, or adopt skill
Art equivalent is replaced.Therefore the equivalent structure change made by all description and diagramatic content with the present invention, or directly or
Apply to indirectly other correlative technology fields be all contained in the same manner the present invention it is covered in the range of.
Claims (8)
1. a kind of speed measurer for motor vehicle, it is characterised in that include：
Support bar, is set in parallel in upper pavement surface along road bearing of trend；
Range sensor, is provided with two, is fixedly installed in support bar two ends respectively；
Control element, is fixedly mounted on the support bar between two range sensors；
Wherein, be additionally provided between the range sensor and control element level signal feedback line for feedback level signal,
Common ground wire and control signal wire, under the control of the control element, edge is perpendicular to pavement of road for the range sensor
Direction gathers its distance to the ground information between road surface, and the range data signal that process is obtained is sent to the control unit
Part, the control element go out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send；
The range sensor includes a data acquisition portion and circuit board, and the data acquisition portion edge is adopted perpendicular to the direction on road surface
Collection distance to the ground information, the circuit board are sent to the control unit after processing to the distance to the ground information for gathering
Part；
The control element controls the data acquisition portion alternation of two range sensors.
2. speed measuring device as claimed in claim 1, it is characterised in that the range sensor is stored with its background with road surface
Distance value；The range sensor is identical with the background distance value which stores in the actual range data which gathers, or real
When the difference of border range data and background distance value is less than preset value, low level signal is sent to the control element, two
The difference of person sends high level signal to the control element when exceeding the preset value.
3. speed measuring device as claimed in claim 2, it is characterised in that the preset value is set to 50cm.
4. speed measuring device as claimed in claim 3, it is characterised in that two range sensors are respectively along described motor-driven
The first range sensor and second distance sensor that the direct of travel of car sets gradually；The control element receive it is described
Start timing during the high level signal that the first range sensor sends, and preserve time when which receives following signal successively：Institute
State the time t1 of high level signal of second distance sensor transmission, first range sensor send low level signal when
Between the time t3 of t2 and second distance sensor when sending low level signal；The control element according to described first away from
From sensor and the second distance sensor the distance between D, and t1, t2, t3 calculate the average speed of the motor vehicles
Degree and accekeration.
5. speed measuring device as claimed in claim 3, it is characterised in that two range sensors are respectively along described motor-driven
The first range sensor and second distance sensor that the direct of travel of car sets gradually；The control element receive it is described
Start timing during the high level signal that the first range sensor sends, and record in second distance sensor transmission high level
Duration t during signal, according to first range sensor and the second distance sensor the distance between D, meter
Calculate the average speed of the motor vehicles.
6. speed measuring device as claimed in claim 1, it is characterised in that the range sensor sample frequency is 1ksps-
100ksps, sampling precision are 1cm-15cm.
7. speed measuring device as claimed in claim 1, it is characterised in that the length range of the support bar is 0.5m-1.2m, institute
Control element is stated for single-chip microcomputer.
8. a kind of motor vehicle speed measuring method based on the arbitrary described speed measuring device of the claims 1-7, it is characterised in that bag
Include following steps：
A support bar be arranged in parallel in upper pavement surface along road bearing of trend, range sensor is respectively mounted in support bar two ends,
One control element is also installed in the middle of support bar；
Two range sensors receive the control command of the control element, and alternately edge is adopted perpendicular to the direction of pavement of road
Collect its distance to the ground information between road surface, and the range data signal that process is obtained is sent to into the control element；
The control element goes out the velocity amplitude of motor vehicles according to the range data signal of change that two range sensors send.
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| CN201410802786.9A CN104504911B (en) | 2013-12-25 | 2014-12-18 | A kind of speed measurer for motor vehicle and speed-measuring method |
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| CN201320873754 | 2013-12-25 | ||
| CN2013208737549 | 2013-12-25 | ||
| CN201410802786.9A CN104504911B (en) | 2013-12-25 | 2014-12-18 | A kind of speed measurer for motor vehicle and speed-measuring method |
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| CN201420818766.6U Active CN204256961U (en) | 2013-12-25 | 2014-12-18 | A kind of speed measurer for motor vehicle |
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| CN105300914B (en) * | 2015-12-04 | 2018-05-15 | 安徽宝龙环保科技有限公司 | A kind of Design of Vehicle Tail Gas Analyzer |
| CN106205149A (en) * | 2016-09-30 | 2016-12-07 | 浙江多普勒环保科技有限公司 | A kind of measuring car height, the speed measurer for motor vehicle of vehicle commander and detection method thereof |
| CN109979204A (en) * | 2019-04-02 | 2019-07-05 | 浙江多普勒环保科技有限公司 | Light cuts multilane speed and acceleration detecting and its method |
| CN111239720B (en) * | 2020-01-17 | 2022-04-22 | 深圳市戴升智能科技有限公司 | Vehicle speed measuring method and device, computer equipment and storage medium |
| CN111796284A (en) * | 2020-08-07 | 2020-10-20 | 南通博远智能科技有限公司 | Speed measuring radar with angle self-adaptive adjustment and speed measuring method |
| CN114720718A (en) * | 2022-03-18 | 2022-07-08 | 安徽省公路桥梁工程有限公司 | Pavement speed measuring method |
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| NL8402094A (en) * | 1984-07-02 | 1986-02-03 | Philips Nv | METHOD FOR DRIVING A TRAFFIC CONTROL SYSTEM AND THE TRAFFIC CONTROL SYSTEM FOR APPLYING THE METHOD |
| GB8727824D0 (en) * | 1987-11-27 | 1987-12-31 | Combustion Dev Ltd | Monitoring means |
| US5173692A (en) * | 1990-08-13 | 1992-12-22 | Ai Computer Services, Inc. | System and method of vehicle detection |
| DE19919925C2 (en) * | 1999-04-30 | 2001-06-13 | Siemens Ag | Arrangement and method for the simultaneous measurement of the speed and the surface shape of moving objects |
| CN2658868Y (en) * | 2003-11-20 | 2004-11-24 | 郝振军 | Road vehicle speed monitoring device |
| WO2006138749A1 (en) * | 2005-06-22 | 2006-12-28 | Gebert Ruediger Heinz | Method and system for speed measurement |
| CN201017476Y (en) * | 2007-02-12 | 2008-02-06 | 王宝根 | Fixed overspeed vehicle laser speed testing evidence obtaining device |
| CN101206229B (en) * | 2007-12-11 | 2010-12-08 | 长安大学 | Method for matching vehicle speed based on linear array CCD image |
| CN101587645A (en) * | 2009-06-02 | 2009-11-25 | 同济大学 | Single-point geomagnetic type vehicle detection apparatus and detection method |
| KR101061588B1 (en) * | 2010-04-07 | 2011-09-20 | 오성레이저테크 (주) | Apparatus and method for estimating car speed using laser |
| CN102226932B (en) * | 2011-05-31 | 2013-11-06 | 东北大学 | Vehicle speed measuring method based on radio frequency identification technology |
| CN102354454B (en) * | 2011-09-28 | 2013-11-06 | 杨多猛 | Vehicle speed measuring method |
| CN102789691A (en) * | 2012-08-21 | 2012-11-21 | 北京信息科技大学 | Detecting method and detecting system of flow and speed of vehicles |
| CN203225009U (en) * | 2012-12-12 | 2013-10-02 | 北京万集科技股份有限公司 | Laser type traffic condition investigation system |
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- 2014-12-18 CN CN201410802786.9A patent/CN104504911B/en active Active
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| CN204256961U (en) | 2015-04-08 |
| CN104504911A (en) | 2015-04-08 |
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