CN204010318U - A kind of vehicle count device - Google Patents
A kind of vehicle count device Download PDFInfo
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- CN204010318U CN204010318U CN201420421837.9U CN201420421837U CN204010318U CN 204010318 U CN204010318 U CN 204010318U CN 201420421837 U CN201420421837 U CN 201420421837U CN 204010318 U CN204010318 U CN 204010318U
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- infrared inductor
- processing circuit
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- infrared
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Abstract
A vehicle count device, comprises the first infrared inductor, the second infrared inductor, signal processing circuit, data processing circuit, and the first infrared inductor is arranged at track road center or top center position, track, for detection of vehicle; The second infrared inductor is identical with the direction that the first infrared inductor is responded to, for detection of road; Described signal processing circuit receives described the first infrared inductor and the second infrared inductor signal, carries out, after filtering, amplification, exporting the voltage signal of the first infrared inductor and the second infrared inductor to data processing circuit; Described data processing circuit is done subtraction process to the first infrared inductor voltage signal and the second infrared inductor voltage signal of input, and voltage difference and threshold voltage signal are compared, and determines whether that having vehicle passes through.The utility model is done subtraction to signal after adopting two infrared inductors to measure respectively, has eliminated the impact of environmental aspect on counting assembly, counts accurately, is convenient to debugging.
Description
Technical field
The utility model relates to vehicle count device, particularly a kind of device that vehicle in advancing on road is counted.
Background technology
China's Road Development is through fast development, and along with the anxiety of land resource, path resource management enters into precision management and optimizing phase.The parameters such as the magnitude of traffic flow, vehicle, the speed of a motor vehicle and vehicle density are to realize the Main Basis of precision management and optimization.By time vehicle count accurately, can understand and grasp current traffic information completely, and can utilize the means such as Based Intelligent Control and prediction, carry out effective traffic control, guarantee the optimum utilization of the unimpeded and existing road of road traffic.
Road vehicles counting is mainly divided into several forms such as inductive coil detection, ultrasound examination, microwave detection, infrared detection, video detection.Inductive coil is one of mode being most widely used during traffic flow is adjusted, and can obtain the basic telecommunication flow informations such as vehicle appearance, process, counting and lane occupancy ratio.Its outstanding advantages is that technology comparative maturity, vehicle count are accurate, but the main deficiency existing is that in installation process, road pavement is destroyed greatly, need to suspend traffic, and affects road life, in use procedure, easily by damages such as heavy vehicle, road surface repairings, there is the problem that vehicle discrimination is low simultaneously.For the traffic flow adjusting system carrying out based on means such as ultrasound wave, microwave, videos, detect principle comparatively advanced, but exist the requirement of system mounting condition high, be subject to the problems such as the large and reliability of environmental influence is low.For infrared detection, except existing the problems referred to above, because needs are responded to thermal source, in the winter time with tend to produce malfunctioning situation in summer, noon and evening.
Summary of the invention
The technical problems to be solved in the utility model overcomes above-mentioned technical matters exactly, proposes a kind of vehicle count device, and it is highly sensitive, strong to adaptive capacity to environment.
In order to address the above problem, the utility model provides a kind of vehicle count device, comprises the first infrared inductor, the second infrared inductor, signal processing circuit, data processing circuit, wherein,
The first infrared inductor is arranged at track road center or top center position, track, for detection of vehicle; The second infrared inductor is identical with the direction that the first infrared inductor is responded to, for detection of road;
Described signal processing circuit receives described the first infrared inductor and the second infrared inductor signal, carries out, after filtering, amplification, exporting the voltage signal of the first infrared inductor and the second infrared inductor to data processing circuit;
Described data processing circuit is done subtraction process to the first infrared inductor voltage signal and the second infrared inductor voltage signal of input, and voltage difference and threshold voltage signal are compared, and determines whether that having vehicle passes through;
Real-time vehicle count information is stored by memory circuitry, and sent into screen display device.
Preferably, also comprise the 3rd infrared inductor, the 3rd infrared inductor is identical with the first direction that infrared inductor is responded to, and the 3rd infrared inductor is parallel with road direction with the first infrared inductor line, and the first infrared inductor and the 3rd infrared inductor interval arrange.
Preferably, also comprise debugging apparatus, by debugging apparatus, threshold voltage signal is set.
Vehicle count device of the present utility model, adopt two infrared inductors, measuring vehicle infrared signal and environment infrared signal, obtain voltage difference by signal being carried out to subtraction operation respectively, voltage difference and threshold voltage signal are compared, thereby draw vehicle count information.In actual working environment, due to the variation of the actual environment situations such as morning and evening, season, weather, the counting assembly under operating mode there will be the problem of miscount.The utility model is done subtraction to signal after adopting two infrared inductors to measure respectively, has eliminated the impact of environmental aspect on counting assembly, counts accurately, is convenient to debugging.
Accompanying drawing explanation
Fig. 1 is the counting assembly installation site schematic diagram of the utility model embodiment;
Fig. 2 is the utility model embodiment counting assembly structural principle schematic diagram.
Embodiment
Hereinafter in connection with accompanying drawing, embodiment of the present utility model is elaborated.
As shown in Figure 1, the vehicle count device installation site schematic diagram of the utility model embodiment, wherein, the first infrared inductor 1 is arranged on road center, conventionally can be arranged on bridge below or erecting device is set separately and install, the second infrared inductor 2 can be arranged on road side, also can be arranged on intransitable other places of vehicle near the first infrared inductor, under working condition, while not having vehicle to pass through, the first infrared inductor and the second infrared inductor institute sensing signal are basic identical.In the utility model, infrared inductor can adopt heat to release infrared inductor.
The 3rd infrared inductor 3, the three infrared inductors can also be set and be arranged on equally road center, and the line of the 3rd infrared inductor and the first infrared inductor is parallel with road, the two is separated with certain distance.
When vehicle 4 travels along the direction of arrow in Fig. 1, it will be by the 3rd infrared inductor, the first infrared inductor institute sensing, but can be by the second infrared inductor sensing.
Object basis is in ceaselessly to extraneous infrared radiation, and in addition, vehicle generally has the high-temperature part as engine, water tank, and when the vehicle in motion passes through infrared inductor, infrared inductor can detect and collect signal, and produces corresponding waveform; Then signal is amplified under distortionless prerequisite, and be converted into voltage signal, in general, after comparing with threshold voltage signal, can judge whether that vehicle passes through.
Yet for example in summer, path temperature is in general higher, the vehicle travelling on road and path temperature are approximate, and infrared inductor, in testing process, is usually judged by accident, make actual vehicle counting produce larger error.
In the utility model, the second infrared inductor induction earth's surface identical with condition of road surface, by numerical value and by the first infrared inductor induced signal subtraction, then difference and threshold signal are compared, thereby eliminated the interference of surface temperature to actual vehicle counting.
As Fig. 2, show the structural principle of the utility model counting assembly.Under original state, infrared inductor 1 and infrared inductor 2 all continue to detect, and produce corresponding waveform; Then signal is sent into signal processing circuit, in signal processing circuit, under distortionless prerequisite, amplify, and be converted into voltage signal; In data processing circuit, voltage is carried out to subtraction and compare with threshold voltage, once coincidence counting condition increases by 1 by memory counts numerical value, and numerical value is presented on display.
Each ingredient of the utility model is carried out to brief description below as follows:
One, infrared inductor
Select commercially available infrared inductor.When sensor signal produces pulse, the voltage of input end continues to have voltage input, and when vehicle is through out-of-date, voltage meeting change, is sent to variation in voltage by circuit.
Two, signal processing circuit
Signal processing circuit comprises wave filter and amplifying circuit two parts.Adopt capacitor to carry out filtering to power supply, power supply flows into infrared inductor power end, and output terminal enters operational amplification circuit after the low-pass filtering of resistance and capacitor.After operational amplification circuit amplifies 300 times, send into data processing circuit.Wherein signal processing circuit concrete structure belongs to technology well known in the art.
Three, data processing circuit
Data processing circuit comprises subtracter and comparator circuit.Subtracter can be selected MSC51 or 89C51 chip, can complete the voltage ratio of the first infrared inductor and the second infrared inductor.The magnitude of voltage obtaining by subtracter computing, compares with predefined threshold voltage signal, once judgement the first infrared inductor and the second infrared inductor voltage difference are greater than threshold voltage, are determined with vehicle and pass through.Above-mentioned subtracter and comparator circuit are well known in the art.
Four, the display circuit of display
In the utility model embodiment, display chip adopts serial LCD chip 12864, and wherein each pin circuit wiring is as the criterion to meet actual displayed needs, and serial LCD chip 12864 belongs to general-purpose chip.
Five, memory circuitry
Memory chip is used for storing counting situation.Select 24C256 chip, belong to 256K bit serial CMOS EPROM, 32768 bytes are contained in inside.Concrete method of attachment and pin function are conventional connection, by interface microcontroller treating apparatus, are controlled.
By the actual test to different time, 2 time, pavement temperature is the highest in the afternoon, morning 4 left and right, pavement temperature is lower, all the other times, pavement temperature all changes.North road surface maximum temperature difference in summer is in 40 degree left and right, and south road surface maximum temperature difference in summer even can reach 50 degree.The north of china in winter road surface temperature difference is 35 degree left and right, and the south road surface temperature difference in winter can reach 40 degree left and right.The conventional infrared vehicle counter of at any time calibrating, all cannot maintain twenty four hours calibration-free.And calibration at every turn all can cause counting interrupt.Calibration based on experience value, cannot adapt to the weather changing at any time, and these factors directly cause infrared counting inaccurate.
In the utility model, due to the existence of the second infrared inductor, effectively got rid of the impact of external environment.
The following describes the behaviour in service of the 3rd infrared inductor in the utility model.
Use above-mentioned the first infrared inductor and the second infrared inductor to coordinate, can complete the accurate counting to vehicle.Under some occasion, also need to calculate the speed of a motor vehicle.Now, the 3rd infrared inductor is linked to system.
With reference to Fig. 1, when vehicle passes through, after the 3rd infrared inductor induction, send signal, send into signal processing circuit.Through in data processing circuit with the second infrared inductor relatively after, judge vehicle process.Subsequently, the 3rd infrared inductor senses same vehicle process, through in data processing circuit with the second infrared inductor relatively after, judge vehicle process.Because the 3rd infrared inductor and the first infrared inductor distance is determined, by this distance with judge that vehicle elapsed time difference does division arithmetic for twice, can obtain real-time vehicle speed.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (2)
1. a vehicle count device, comprises the first infrared inductor, the second infrared inductor, signal processing circuit, data processing circuit, it is characterized in that,
The first infrared inductor is arranged at track road center or top center position, track, for detection of vehicle; The second infrared inductor is identical with the direction that the first infrared inductor is responded to, for detection of road;
Described signal processing circuit receives described the first infrared inductor and the second infrared inductor signal, carries out, after filtering, amplification, exporting the voltage signal of the first infrared inductor and the second infrared inductor to data processing circuit;
Described data processing circuit is done subtraction process to the first infrared inductor voltage signal and the second infrared inductor voltage signal of input, and voltage difference and threshold voltage signal are compared, and determines whether that having vehicle passes through;
Real-time vehicle count information is stored by memory circuitry, and sent into screen display device.
2. according to the vehicle count device of claim 1, characterized by further comprising the 3rd infrared inductor, the 3rd infrared inductor is identical with the first direction that infrared inductor is responded to, the 3rd infrared inductor is parallel with road direction with the line of the first infrared inductor, and the first infrared inductor and the 3rd infrared inductor interval arrange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420421837.9U CN204010318U (en) | 2014-07-29 | 2014-07-29 | A kind of vehicle count device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420421837.9U CN204010318U (en) | 2014-07-29 | 2014-07-29 | A kind of vehicle count device |
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| Publication Number | Publication Date |
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| CN204010318U true CN204010318U (en) | 2014-12-10 |
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| CN201420421837.9U Expired - Fee Related CN204010318U (en) | 2014-07-29 | 2014-07-29 | A kind of vehicle count device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110288833A (en) * | 2019-07-15 | 2019-09-27 | 北京航空航天大学 | A kind of vehicle flow detection system based on high-precision infrared sensor array |
-
2014
- 2014-07-29 CN CN201420421837.9U patent/CN204010318U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110288833A (en) * | 2019-07-15 | 2019-09-27 | 北京航空航天大学 | A kind of vehicle flow detection system based on high-precision infrared sensor array |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |