CN2854729Y - Road vehicle detection device based on flat capacitance sensor - Google Patents
Road vehicle detection device based on flat capacitance sensor Download PDFInfo
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- CN2854729Y CN2854729Y CN 200520099179 CN200520099179U CN2854729Y CN 2854729 Y CN2854729 Y CN 2854729Y CN 200520099179 CN200520099179 CN 200520099179 CN 200520099179 U CN200520099179 U CN 200520099179U CN 2854729 Y CN2854729 Y CN 2854729Y
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- electric capacity
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Abstract
The utility model belongs to a road vehicle detection system based on plate capacitor sensor, which comprises a low-frequency oscillation circuit (2), a frequency-to-voltage conversion circuit (3), a analog-to-digital conversion circuit (4), a single-chip control circuit (5), and a display circuit (6), the output of the low-frequency oscillation circuit (2) being connected to the input of the frequency-to-voltage conversion circuit (3), the output of the frequency-to-voltage conversion circuit (3) being connected to the input of the analog-to-digital conversion circuit (4), the output of the analog-to-digital conversion circuit (4) being connected to the input of the single-chip control circuit (5), and the display circuit (6) being connected to the single-chip control circuit (5), wherein the variable capacitor of the low-frequency oscillation circuit (2) is replaced by a variable-distance plate capacitor (1) that is embedded in a lane (7). The utility model has the advantages of low cost and less environmental influence on detection results.
Description
Technical field
The utility model belongs to a kind of road vehicle pick-up unit, and particularly a kind of use capacity plate antenna sensor is counted vehicle detection apparatus with check weighing to the vehicle of process.
Background technology
Multiple wagon detector is arranged at present, can be divided into 3 classes by the electromagnetic wavelength scope of working method and monitor work: magnetic is wagon detector, ripple wagon detector and video frequency vehicle detecting device frequently frequently.Magnetic frequency wagon detector is based on the wagon detector of electromagnetic induction principle.Main use is the toroid winding detecting device in the magnetic frequency detecting device, and it is many to be characterized in surveying parameter, and induction sensitivity is adjustable, and the adaptability of use is bigger, installs not too complicated.Shortcoming is because the distortion on road surface etc. can influence the serviceability and the life-span of detecting device.Ripple detecting device frequently is with microwave, ultrasound wave and infrared ray etc. the vehicle launching electromagnetic wave to be produced the detecting device of induction.Ripple detecting device frequently all is to hang to install, and does not destroy the road surface, move, set up conveniently, and long service life, but accuracy of detection is subject to the influence of environment.Video detector partly is made up of electron camera, image processor and display etc. usually.By the image of taking is carried out the process that Flame Image Process is judged vehicle.Its shortcoming is that real-time is poor, and the vehicle detection precision is subjected to the restriction of total system software and hardware condition, and is subject to the influence of weather condition, and cost is higher usually.
Summary of the invention
The purpose of this utility model is to provide that a kind of cost is low, the testing result little road vehicle pick-up unit based on the capacity plate antenna sensor affected by environment.
To achieve these goals, the technical solution of the utility model is: based on the road vehicle pick-up unit of capacity plate antenna sensor, it comprises low-frequency oscillatory network 2, frequency-voltage conversion circuit 3, analog to digital conversion circuit 4, single chip machine controlling circuit 5 and display circuit 6, the output of low-frequency oscillatory network 2 links to each other with the input of frequency-voltage conversion circuit 3, the output of frequency-voltage conversion circuit 3 links to each other with the input of analog to digital conversion circuit 4, the output of analog to digital conversion circuit 4 links to each other with the input of single chip machine controlling circuit 5, and display circuit 6 links to each other with single chip machine controlling circuit 5; It is characterized in that: the variable capacitance of low-frequency oscillatory network 2 is the capacity plate antenna 1 of pole-changing distance, and the capacity plate antenna 1 of pole-changing distance is embedded on the track 7.
The capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at outside the sealing rubber cover, electric capacity top crown 8, electric capacity bottom crown 10 are respectively scale copper, and medium is a rubber.
The capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, electric capacity bottom crown 10 is a shape plate, electric capacity top crown 8 is positioned at the middle part, shape chamber and middle filling of electric capacity bottom crown 10 expires medium 9, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at outside the sealing rubber cover, electric capacity top crown 8, electric capacity bottom crown 10 are respectively scale copper, and medium is a rubber.
The capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at outside the sealing rubber cover, electric capacity top crown 8 is metal knitted net, electric capacity bottom crown 10 is a scale copper, and medium is a rubber.
The utility model its working principles is: (capacity plate antenna 1 of pole-changing distance is the variable capacitance Cx among Fig. 3 to the capacity plate antenna 1 by being installed in the pole-changing distance on the track, and the C among Fig. 3 is for being reference capacitance, and Cc is a trimmer.) detecting passing through of vehicle, the top crown of the capacity plate antenna 1 of pole-changing distance is movable, out-of-date when the vehicle pressure, because the effect of pressure is filled in the medium generation deformation between the two-plate, the two-plate spacing reduces.According to capacity plate antenna computing formula C=
ε S/
d, when polar plate spacing d reduced, because DIELECTRIC CONSTANT and pole plate useful area S are constant, so capacitor C increased.At this moment, be that the oscillation frequency of the RC oscillatory circuit of chief component will change with the capacity plate antenna.According to the oscillatory circuit frequency formula
Resistance R wherein
fConstant, capacitor C increases.Therefore the frequency of the signal of oscillatory circuit generation reduces.This frequency signal is converted to and the corresponding analog voltage signal of frequency values through frequency-voltage conversion circuit, this voltage signal carries out quantization encoding through the A/D change-over circuit by its amplitude again and is converted to the manageable digital signal of single-chip microcomputer, give single-chip microcomputer with this coding transmission, single-chip microcomputer just can judge whether the weight of the vehicle that car passes through and passes through according to resulting numerical value.Through handling, can realize that when do not have vehicle to pass through the voltage quantized signal that single-chip microcomputer obtains is 0 or is approximately 0, as vehicle by the time, the pressure of vehicle is big more, the voltage value that single-chip microcomputer obtains is just big more, by display circuit 6 demonstration testing results.
The utility model adopts said structure, the capacity plate antenna that uses the pole-changing distance is as sensor, can be according to having or not vehicle to cross because vehicle presses the capacitance variations that causes to judge, while can be detected for dynamic and static vehicle according to the weight of the big or small dynamic estimation vehicle of capacitance variation; Adopt the capacity plate antenna 1 of pole-changing distance, it is simple in structure, cost is low, and the capacity plate antenna 1 of pole-changing distance is embedded on the track 7, and testing result is affected by environment little.Low-frequency oscillatory network is selected the RC low-frequency oscillatory network for use, and its cost is low, and power is little, power saving.
Description of drawings
Fig. 1 is the structural drawing of the utility model embodiment 1
Fig. 2 is the structural representation of the utility model embodiment 2
Fig. 3 is circuit theory diagrams of the present utility model
Fig. 4 is the capacity plate antenna structural representation of the pole-changing distance among the utility model embodiment 1, the embodiment 2
Fig. 5 is the capacity plate antenna structural representation of the pole-changing distance among the utility model embodiment 3
Fig. 6 is the capacity plate antenna structural representation of the pole-changing distance among the utility model embodiment 4
Fig. 7 is the capacity plate antenna structural representation of the pole-changing distance among the utility model embodiment 5
Fig. 8 is the vertical view of electric capacity top crown among Fig. 7
Among the figure: the capacity plate antenna of 1-pole-changing distance, 2-low-frequency oscillatory network, 3-frequency-voltage conversion circuit, 4 analog to digital conversion circuits, 5-single chip machine controlling circuit, 6-display circuit, 7-track, 8-electric capacity top crown, 9-medium, 10-electric capacity bottom crown, 11-rubber skin plating.
Embodiment
The present invention is further described below in conjunction with accompanying drawing and example.
Embodiment 1:
As Fig. 1, shown in Figure 3, road vehicle pick-up unit based on the capacity plate antenna sensor, it comprises capacity plate antenna 1, low-frequency oscillatory network 2, frequency-voltage conversion circuit 3, analog to digital conversion circuit 4, single chip machine controlling circuit 5 and the display circuit 6 of pole-changing distance, the output of low-frequency oscillatory network 2 links to each other with the input of frequency-voltage conversion circuit 3, the output of frequency-voltage conversion circuit 3 links to each other with the input of analog to digital conversion circuit 4, the output of analog to digital conversion circuit 4 links to each other with the input of single chip machine controlling circuit 5, and display circuit 6 links to each other with single chip machine controlling circuit 5; The variable capacitance of low-frequency oscillatory network 2 is that (pole plate of the capacity plate antenna 1 of the pole-changing distance back ground connection of connecting with reference capacitance C, trimming capacitor C c, another pole plate of the capacity plate antenna 1 of pole-changing distance connects respectively the resistance R with low-frequency oscillatory network 2 for the capacity plate antenna 1 of pole-changing distance
f, integrated operational amplifier negative pole link to each other), the capacity plate antenna 1 of pole-changing distance is embedded on the track 7.As shown in Figure 4, the capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at sealing rubber cover outer (not drawing sealing rubber cover among the figure), electric capacity top crown 8, electric capacity bottom crown 10 are respectively scale copper, and medium is a rubber.
Embodiment 2:
As Fig. 2, shown in Figure 3, road vehicle pick-up unit based on the capacity plate antenna sensor, it comprises capacity plate antenna 1, low-frequency oscillatory network 2, frequency-voltage conversion circuit 3, analog to digital conversion circuit 4, single chip machine controlling circuit 5 and the display circuit 6 of pole-changing distance, the output of low-frequency oscillatory network 2 links to each other with the input of frequency-voltage conversion circuit 3, the output of frequency-voltage conversion circuit 3 links to each other with the input of analog to digital conversion circuit 4, the output of analog to digital conversion circuit 4 links to each other with the input of single chip machine controlling circuit 5, and display circuit 6 links to each other with single chip machine controlling circuit 5; The variable capacitance of low-frequency oscillatory network 2 is that (pole plate of the capacity plate antenna 1 of the pole-changing distance back ground connection of connecting with reference capacitance C, trimming capacitor C c, another pole plate of the capacity plate antenna 1 of pole-changing distance connects respectively the resistance R with low-frequency oscillatory network 2 for the capacity plate antenna 1 of pole-changing distance
f, integrated operational amplifier negative pole link to each other), the capacity plate antenna 1 of pole-changing distance is embedded on the track 7; When carrying out vehicle detection and check weighing, the wheel that only need find out vehicle one side was pressed and was got final product, therefore, the pole plate length of the capacity plate antenna 1 of pole-changing distance is reduced by half, only the capacity plate antenna 1 of pole-changing distance is installed in a side in track, as Fig. 2, so both save material, do not influenced the precision of measurement again.
As shown in Figure 4, the capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at sealing rubber cover outer (not drawing sealing rubber cover among the figure), electric capacity top crown 8, electric capacity bottom crown 10 are respectively scale copper, and medium is a rubber.
Embodiment 3: basic identical with embodiment 1 or embodiment 2, difference only is the capacity plate antenna 1 of pole-changing distance.As shown in Figure 5, the capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, electric capacity bottom crown 10 is a shape plate, electric capacity top crown 8 is positioned at the middle part, shape chamber and the middle full medium 9 (electric capacity top crown 8 is isolated with electric capacity bottom crown 10) of filling of electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 is positioned at sealing rubber cover, and electric capacity top crown 8, the joint of electric capacity bottom crown 10 lays respectively at sealing rubber cover outer (not drawing sealing rubber cover among the figure), electric capacity top crown 8, electric capacity bottom crown 10 is respectively scale copper, and medium is a rubber.The capacity plate antenna 1 of pole-changing distance just is equivalent to the parallel connection of the movable capacity plate antenna of two top crowns like this, and it is out-of-date that automobile is pressed, and the change amount of electric capacity is exactly the twice of single electric capacity, and it is obvious to detect effect.Use shape plate that bottom crown is encased, played the effect of shielding.
Embodiment 4: basic identical with embodiment 1 or embodiment 2, difference only is the capacity plate antenna 1 of pole-changing distance.As shown in Figure 6, the capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, rubber skin plating 11, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at the casing that 6 rubber skin platings 11 are formed, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at outside the rubber skin plating 11, electric capacity top crown 8, electric capacity bottom crown 10 are respectively scale copper, and medium is a rubber.Use rubber skin plating 11 with electric capacity top crown 8, medium 9, electric capacity bottom crown 10 parcels, played preventing that rainwater from influencing the capacity plate antenna 1 detection effect of pole-changing distance, the effect of shielding extraneous interference.
Embodiment 5: basic identical with embodiment 1 or embodiment 2, difference only is the capacity plate antenna 1 of pole-changing distance.As Fig. 7, shown in Figure 8, the capacity plate antenna 1 of described pole-changing distance comprises electric capacity top crown 8, medium 9, electric capacity bottom crown 10, medium is between electric capacity top crown 8, electric capacity bottom crown 10, electric capacity top crown 8, medium 9, electric capacity bottom crown 10 are positioned at sealing rubber cover, and the joint of electric capacity top crown 8, electric capacity bottom crown 10 lays respectively at sealing rubber cover outer (not drawing sealing rubber cover among the figure), electric capacity top crown 8 is metal knitted net, and electric capacity bottom crown 10 is a scale copper, and medium is a rubber.At the shortcoming of movable plate electrode use copper sheet easy deformation and fracture, use good springiness, weave metal knitted closely net as movable plate electrode, because the braiding of metal knitted net is closely, when calculating, can look as a whole.Press out-of-dately when vehicle,, can stand for a long time to roll and do not rupture, prolonged the life-span of whole sensor because the elasticity of wire netting itself can restore to the original state rapidly after the generation deformation.
The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.
Claims (4)
1. based on the road vehicle pick-up unit of capacity plate antenna sensor, it comprises low-frequency oscillatory network (2), frequency-voltage conversion circuit (3), analog to digital conversion circuit (4), single chip machine controlling circuit (5) and display circuit (6), the output of low-frequency oscillatory network (2) links to each other with the input of frequency-voltage conversion circuit (3), the output of frequency-voltage conversion circuit (3) links to each other with the input of analog to digital conversion circuit (4), the output of analog to digital conversion circuit (4) links to each other with the input of single chip machine controlling circuit (5), and display circuit (6) links to each other with single chip machine controlling circuit (5); It is characterized in that: the variable capacitance of low-frequency oscillatory network (2) is the capacity plate antenna (1) of pole-changing distance, and the capacity plate antenna of pole-changing distance (1) is embedded on the track (7).
2. the road vehicle pick-up unit based on the capacity plate antenna sensor according to claim 1, it is characterized in that: the capacity plate antenna of described pole-changing distance (1) comprises electric capacity top crown (8), medium (9), electric capacity bottom crown (10), medium is positioned at electric capacity top crown (8), between the electric capacity bottom crown (10), electric capacity top crown (8), medium (9), electric capacity bottom crown (10) is positioned at sealing rubber cover, and electric capacity top crown (8), the joint of electric capacity bottom crown (10) lays respectively at outside the sealing rubber cover, electric capacity top crown (8), electric capacity bottom crown (10) is respectively scale copper, and medium is a rubber.
3. the road vehicle pick-up unit based on the capacity plate antenna sensor according to claim 1, it is characterized in that: the capacity plate antenna of described pole-changing distance (1) comprises electric capacity top crown (8), medium (9), electric capacity bottom crown (10), electric capacity bottom crown (10) is a shape plate, electric capacity top crown (8) is positioned at the middle part, shape chamber and middle filling of electric capacity bottom crown (10) expires medium (9), electric capacity top crown (8), medium (9), electric capacity bottom crown (10) is positioned at sealing rubber cover, and electric capacity top crown (8), the joint of electric capacity bottom crown (10) lays respectively at outside the sealing rubber cover, electric capacity top crown (8), electric capacity bottom crown (10) is respectively scale copper, and medium is a rubber.
4. the road vehicle pick-up unit based on the capacity plate antenna sensor according to claim 1, it is characterized in that: the capacity plate antenna of described pole-changing distance (1) comprises electric capacity top crown (8), medium (9), electric capacity bottom crown (10), medium is positioned at electric capacity top crown (8), between the electric capacity bottom crown (10), electric capacity top crown (8), medium (9), electric capacity bottom crown (10) is positioned at sealing rubber cover, and electric capacity top crown (8), the joint of electric capacity bottom crown (10) lays respectively at outside the sealing rubber cover, electric capacity top crown (8) is metal knitted net, electric capacity bottom crown (10) is a scale copper, and medium is a rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520099179 CN2854729Y (en) | 2005-12-02 | 2005-12-02 | Road vehicle detection device based on flat capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520099179 CN2854729Y (en) | 2005-12-02 | 2005-12-02 | Road vehicle detection device based on flat capacitance sensor |
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| CN2854729Y true CN2854729Y (en) | 2007-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520099179 Expired - Fee Related CN2854729Y (en) | 2005-12-02 | 2005-12-02 | Road vehicle detection device based on flat capacitance sensor |
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| CN (1) | CN2854729Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102669000A (en) * | 2012-05-09 | 2012-09-19 | 杨栋 | Intelligent crib capable of detecting ingredients and weight of material by utilizing capacitance method |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN103927883A (en) * | 2014-04-04 | 2014-07-16 | 中国科学院电工研究所 | Impedance imaging vehicle detection system and method based on piezoresistance materials |
| CN112113649A (en) * | 2020-08-10 | 2020-12-22 | 华南理工大学 | Two-dimensional monitoring system and method for bridge structure response under vehicle load and action thereof |
-
2005
- 2005-12-02 CN CN 200520099179 patent/CN2854729Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102669000A (en) * | 2012-05-09 | 2012-09-19 | 杨栋 | Intelligent crib capable of detecting ingredients and weight of material by utilizing capacitance method |
| CN102669000B (en) * | 2012-05-09 | 2014-12-17 | 珠海同方爱德科技有限公司 | Intelligent crib capable of detecting ingredients and weight of material by utilizing capacitance method |
| CN102750828A (en) * | 2012-07-24 | 2012-10-24 | 苏州工业园区七星电子有限公司 | Crossing vehicle flow monitoring system |
| CN103927883A (en) * | 2014-04-04 | 2014-07-16 | 中国科学院电工研究所 | Impedance imaging vehicle detection system and method based on piezoresistance materials |
| CN103927883B (en) * | 2014-04-04 | 2016-03-23 | 中国科学院电工研究所 | Based on electrical impedance imaging vehicle detecting system and the detection method of pressure drag material |
| CN112113649A (en) * | 2020-08-10 | 2020-12-22 | 华南理工大学 | Two-dimensional monitoring system and method for bridge structure response under vehicle load and action thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |