CN202102594U - Vehicle-detecting device - Google Patents
Vehicle-detecting device Download PDFInfo
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- CN202102594U CN202102594U CN2011201744307U CN201120174430U CN202102594U CN 202102594 U CN202102594 U CN 202102594U CN 2011201744307 U CN2011201744307 U CN 2011201744307U CN 201120174430 U CN201120174430 U CN 201120174430U CN 202102594 U CN202102594 U CN 202102594U
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- magnetic field
- magnetoresistive transducer
- detection apparatus
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- vehicle
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Abstract
The utility model relates to a vehicle-detecting device, which comprises a sensor, an amplifier, a processing unit and a wireless receiving-transmitting unit; the sensor is used for detecting the intensity of a magnetic field, converting the intensity information of the magnetic field into an intensity signal of the magnetic field and sending the intensity signal of the magnetic field to the amplifier; the amplifier is used for carrying out amplification processing for the received intensity signal of the magnetic field and sending the amplified intensity signal of the magnetic field to the processing unit; the processing unit is used for receiving the amplified intensity signal of the magnetic field, judging whether a vehicle passes or not according to the intensity signal of the magnetic field, generating vehicle-covering information including time data and sending the vehicle-covering information to the wireless receiving-transmitting unit; and the wireless receiving-transmitting unit is used for sending the received vehicle-covering information through an antenna. In the vehicle-detecting device disclosed by the utility model, three paths of magnetic resistance are utilized for detection, so that the detecting precision is improved; a bran-new detecting means is selected, so that the detecting accuracy and reliability are improved; and meanwhile, the mode of wireless communication is applied, so that the construction difficulty is greatly lowered.
Description
Technical field
The utility model relates to a kind of vehicle detection apparatus, relates in particular to a kind of pick-up unit that utilizes geomagnetic effect that the vehicle that passes through is detected.
Background technology
Along with development of times, traffic problems have become a big problem in puzzlement city, gather with regard to the automobile information that needs road pavement and crossing if hope the transport solution problem, for example gather automobile and cross information.
Existing automobile information acquisition mode has electromagnetic sensing, ultrasonic sensing, radar detection, Video Detection or the like.Ring coil type vehicle detection apparatus for example; When vehicle through being embedded in the toroid winding under the road surface; Cause the variation of coil magnetic field, detecting device calculates the information of vehicle in view of the above, draws the traffic parameters such as flow, speed, time occupancy and length of vehicle thus; And be uploaded to central control system, to satisfy the needs of traffic control system.
But prior art is because self measuring principle limits, and when wagon flow is blocked up, following distance is less than 3m the time, and its accuracy of detection will reduce significantly, even can't detect.And cut the influence that is subject to freezing, subgrade settlement, physical environment such as saline and alkaline.Great in constructing amount in the practice of construction process, the havoc road surface.Be prone in the use be damaged, be difficult to safeguard, and the cost of construction and maintenance is high.Operational use time is short.
The utility model content
The purpose of the utility model is the defective to prior art, and a kind of vehicle detection apparatus is provided, and not influenced by weather effect and light, and fiduciary level is high, and the working time is of a specified duration.
For realizing above-mentioned purpose, the utility model provides a kind of vehicle detection apparatus, and said vehicle detection apparatus specifically comprises: sensor, amplifier, processing unit and wireless transmit/receive units;
Said sensor is connected with said amplifier, and said amplifier is connected with said processing unit, and said processing unit is connected with said wireless transmit/receive units;
The intensity in said sensor magnetic field converts the strength information in magnetic field the strength signal in magnetic field into and sends to said amplifier; Said amplifier carries out the strength signal in the magnetic field that receives processing and amplifying and sends to said processing unit; Said processing unit receives the strength signal in the magnetic field after amplifying, and has judged whether that according to the strength signal in this magnetic field vehicle passes through, and generates to comprise that the vehicle of time data covers information, and sends to said wireless transmit/receive units; The said vehicle that said wireless transmit/receive units will receive through antenna covers information and sends.
Said sensor is the single shaft magnetoresistive transducer.
Said sensor is the diaxon magnetoresistive transducer, and said vehicle detection apparatus comprises a switch element, and said diaxon magnetoresistive transducer is connected with said amplifier through said switch element; Said diaxon magnetoresistive transducer detects the intensity in the magnetic field of both direction, and generates the strength signal in two-way magnetic field, is sent to said amplifier through said switch element.Said diaxon magnetoresistive transducer is specially the twin shaft magnetoresistive transducer of intensity in the magnetic field of the both direction that detects quadrature.
Said sensor is single shaft magnetoresistive transducer and twin shaft magnetoresistive transducer, and said vehicle detection apparatus comprises a switch element, and said single shaft magnetoresistive transducer is connected with said amplifier through said switch element respectively with the twin shaft magnetoresistive transducer; Said single shaft magnetoresistive transducer generates the strength signal in one tunnel magnetic field, and said twin shaft magnetoresistive transducer generates the strength signal in two-way magnetic field, all opens the unit through one and is sent to said amplifier.Said single shaft magnetoresistive transducer and said diaxon magnetoresistive transducer are specially the magnetoresistive transducer of intensity in the magnetic field of three directions that detect quadrature.
Said vehicle detection apparatus also comprises power supply, is connected with said processing unit.Said vehicle detection apparatus also comprises PMU, is connected with processing unit with said power supply.
The vehicle detection apparatus of the utility model utilizes three road magnetic resistance to detect, and has improved accuracy of detection, selects for use brand-new detection means to improve detection accuracy and reliability, uses the mode of radio communication simultaneously, greatly reduces the difficulty of construction.
Description of drawings
Fig. 1 is one of synoptic diagram of the utility model vehicle detection apparatus;
Fig. 2 be the utility model vehicle detection apparatus synoptic diagram two.
Embodiment
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
The vehicle detection apparatus of the utility model is a kind of earth magnetism type pick-up unit, utilizes the input in magnetic field, the face of land is judged passing through of vehicle.
Fig. 1 is one of synoptic diagram of the utility model vehicle detection apparatus, and is as shown in the figure, and the vehicle detection apparatus of the utility model specifically comprises sensor 10, amplifier 20, processing unit 30 and wireless transmit/receive units 40.
Fig. 2 be the utility model vehicle detection apparatus synoptic diagram two; As shown in the figure, the vehicle detection apparatus of present embodiment specifically comprises sensor 10, switch element 60, amplifier 20, processing unit 30, wireless transmit/receive units 40, antenna 50, power supply 70 and PMU 80.
The implementation of sensor 10 has a lot, the present embodiment utilization be that single shaft magnetoresistive transducer 11 adds twin shaft magnetoresistive transducer 12.Realization can also have a lot; For example can be only with a single shaft magnetoresistive transducer 11; So just do not need switch element 60 to switch, and the detection side of this single shaft magnetoresistive transducer to the vehicle operating direction should be consistent, so just can effectively improve accuracy of detection.And can be only with a twin shaft magnetoresistive transducer 12; This twin shaft magnetoresistive transducer 12 detects the Strength Changes in the magnetic field of both direction; Generate the strength signal in two-way magnetic field, switch through switch element 60 and send, and this both direction that is detected should be a quadrature; In addition, one of them direction should be consistent with the vehicle operating direction.
The sensor 10 of present embodiment is that a single shaft magnetoresistive transducer 11 adds a twin shaft magnetoresistive transducer 12; Single shaft magnetoresistive transducer 11 detects the Strength Changes in the magnetic field of a direction; And twin shaft magnetoresistive transducer 12 detects the Strength Changes in the magnetic field of both direction; And these three directions all are quadratures, can realize high-precision test thus, and having is exactly one of them detection side to being consistent with the wagon flow direction again.Detect through detecting magnetic flux during the Strength Changes in two sensor magnetic fields.
The detection principle of two magnetoresistive transducers is the same, all is the Strength Changes that detects earth magnetism, can detect magnetic field intensity E or magnetic induction density B.After the Strength Changes in single shaft magnetoresistive transducer 11 detection magnetic fields, generate the strength signal in one tunnel magnetic field; And after the Strength Changes in twin shaft magnetoresistive transducer 12 detection magnetic fields, generating the strength signal in two-way magnetic field, the strength signal in this three tunnel magnetic field must all will send through switch element 60.
Because the strength signal in three tunnel above-mentioned magnetic fields is simulating signals, so switch element 60 also is an analog switch, switch element 60 switches three tunnel above-mentioned magnetic fields of output in turn under the control of processing unit 30 strength signal is to amplifier 20.
Antenna 50 can be a directional antenna; The benefit of directional antenna has converging action exactly; Can and be converged in certain scope the signal bondage that sends; Signal intensity in this scope can make that thus the propagation distance of signal is distant, and the antijamming capability of signal can strengthen thereupon also than the convergent averaged magnitude is not big.
In addition; Because generally the utility model vehicle detection apparatus is a passive device; Must carry out work with the electric weight of self battery; And in order to increase serviceable life, if effectively saves energy loss and power consumption are with extremely important, the electric energy loss of the utility model effective saveall through a kind of mechanism.
Because the working environment of the utility model vehicle detection apparatus is very abominable; Possibly be very high high temperature; Also possibly be low-down low temperature, therefore just need battery to have working temperature very on a large scale, the battery of the utility model can utilize lithium thionyl chloride cell to realize; Battery capacity is big, can be operated in 80 and spend the temperature range of subzero 40 degree.
All power supplies of power supply 70 are not direct power supplies; At processing unit 30 inner constantly synchronous clocks; This clock is to realize through constantly receiving a time synchronization information that issues by wireless transmit/receive units 40; Wireless receiving and dispatching power supply 40 sends to processing unit 30 with this time synchronization information, and processing unit 30 is calibrated the time data of internal operation according to this time synchronization information.Stipulated a time slot in this synchronizing information, the vehicle detection apparatus of the utility model is only worked in the official hour gap, outside this time slot, is in dormant state.
When the clock arrival of 30 li of processing units needs the time slot of work; The utility model vehicle detection apparatus is when dormant state changes duty into; Processing unit 30 is from waking up; Give single shaft magnetoresistive transducer 11,12 power supplies of twin shaft magnetoresistive transducer, control wireless transmit/receive units 40 then and wake up, wireless transmit/receive units 40 works on power.Simultaneously, 80 work of processing unit 30 control PMUs are switch element 60 and amplifier 20 powered operation.
When the clock of 30 li of processing units when arriving the time slot of dormancy; The utility model vehicle detection apparatus is when duty changes dormant state into; Processing unit 30 stops to be single shaft magnetoresistive transducer 11,12 power supplies of twin shaft magnetoresistive transducer; Control wireless transmit/receive units 40 dormancy, wireless transmit/receive units 40 dormancy that do not power on.Simultaneously, 80 dormancy of processing unit 30 control PMUs are cut to the power supply of switch element 60, amplifier 20, like this single shaft magnetoresistive transducer 11, twin shaft magnetoresistive transducer 12, switch element 60, also dormancy of amplifier 20.Processing unit 30 self carries out dormancy equally except that keeping clock.
Utilization is according to the work of the time slot of synchronous clock and the switching of dormancy; When not needing work, make the utility model vehicle detection apparatus be in dormant state, thereby can work on power constantly; Effectively practice thrift the consumption of electric energy, guaranteed working long hours of the utility model.
The concrete operative scenario and the course of work are following:
The vehicle detection apparatus of the utility model can be pressed with anti-by waterproof and dustproof, has two-layer housing, is filled with silica gel in the internal layer shell, be used for waterproof with dustproof, and internal layer shell has waterproof and dustproof effect equally.The main effect of outer casing is resistance to compression, utilizes the material with resistance to compression physical characteristics to make outer casing.The utility model can have the anti-pressure energy power of 15-20 ton, and can be installed in the below, road surface in any highway section, so long as the highway section that needs the detection vehicle to pass through all is fine, for example often is used for before the crossing.The position, road surface of the vehicle detection apparatus of the utility model is installed at needs.
When dispatching from the factory, vehicle detection apparatus has been made and encapsulation finishes, and is installed under the road surface then.
Vehicle detection apparatus has a networking and initialized process before use; After installing, need accept networking information; The time of reception synchronizing information; Carry out clock synchronization, and learn thus by network allocation and give the working time of self and the time slot of dormancy time, accomplish network process.
So-called initialization procedure its objective is the background magnetic field for self-adaptation this locality, theoretically, and the different geographical place; Background magnetic field is not identical; So just need an adaptive initialization procedure, thereby guarantee the degree of accuracy of detection, prevent the generation of erroneous detection as far as possible.Initialized process is exactly constantly to accept the change information of magnetic field intensity, through initialized mechanism, confirms local background magnetic field, utilizes the variation of magnetic field intensity to judge whether that vehicle passes through according to this background magnetic field.
Measuring process is following:
Step 101, detect the Strength Changes in three magnetic fields on the orthogonal directions, generate the strength signal in three tunnel magnetic fields by single shaft magnetoresistive transducer and twin shaft magnetoresistive transducer;
Step 102, the switching of the switch element of control module control sends to amplifier with the strength signal in above-mentioned three tunnel magnetic fields;
Step 103 sends to control module after the strength signal amplification of amplifier with above-mentioned three tunnel magnetic fields;
Step 104, control module has judged whether that according to the strength signal in this three tunnel magnetic field vehicle passes through, if having vehicle through generate a vehicle that includes the time data that vehicle passes through and cover information;
Step 105, control module covers the information transmission through the antenna of wireless transmit/receive units with vehicle.
Before measuring, the utility model also has a wakeup process, then has a sleep procedure after measuring.Wakeup process is: when the clock arrival in the processing unit needs the time slot of work; The utility model vehicle detection apparatus is when dormant state changes duty into; Processing unit is controlled wireless transmit/receive units then and is waken up from waking up, and wireless transmit/receive units 40 works on power.Simultaneously, the work of processing unit control PMU is single shaft magnetoresistive transducer, twin shaft magnetoresistive transducer, switch element, amplifier powered operation.
Sleep procedure is: when the clock in the processing unit when arriving the time slot of dormancy, the utility model vehicle detection apparatus when duty changes dormant state into, the dormancy of processing unit control wireless transmit/receive units, the wireless transmit/receive units dormancy that do not power on.Simultaneously, the dormancy of processing unit control PMU is cut to the power supply of single shaft magnetoresistive transducer, twin shaft magnetoresistive transducer, switch element, amplifier, like this single shaft magnetoresistive transducer, twin shaft magnetoresistive transducer, switch element, also dormancy of amplifier.Processing unit self carries out dormancy equally except that keeping clock.
The vehicle detection apparatus of the utility model owing to have the adaptive process of background magnetic field, therefore can effectively reduce the detection error; Utilize dormancy and arouse machine processed to effectively reduce power consumption, increased serviceable life, and utilize three road magnetic resistance to detect, improved accuracy of detection equally.Have, the utility model vehicle detection apparatus selects for use brand-new detection means to improve detection accuracy and reliability again.Use the mode of radio communication simultaneously, greatly reduce the difficulty of construction.Through well-designed detecting device, reduced the damage of road pavement greatly, reduced the dependence of environment to external world.
It should be noted last that; Above embodiment is only unrestricted in order to the technical scheme of explanation the utility model; Although the utility model is specified with reference to preferred embodiment; Those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement the technical scheme of the utility model, and do not break away from the spirit and the scope of the utility model technical scheme.
Claims (8)
1. a vehicle detection apparatus is characterized in that, said vehicle detection apparatus specifically comprises: sensor, amplifier, processing unit and wireless transmit/receive units;
Said sensor is connected with said amplifier, and said amplifier is connected with said processing unit, and said processing unit is connected with said wireless transmit/receive units;
The intensity in said sensor magnetic field converts the strength information in magnetic field the strength signal in magnetic field into and sends to said amplifier; Said amplifier carries out the strength signal in the magnetic field that receives processing and amplifying and sends to said processing unit; Said processing unit receives the strength signal in the magnetic field after amplifying, and has judged whether that according to the strength signal in this magnetic field vehicle passes through, and generates to comprise that the vehicle of time data covers information, and sends to said wireless transmit/receive units; The said vehicle that said wireless transmit/receive units will receive through antenna covers information and sends.
2. vehicle detection apparatus according to claim 1 is characterized in that, said sensor is the single shaft magnetoresistive transducer.
3. vehicle detection apparatus according to claim 1 is characterized in that, said sensor is the diaxon magnetoresistive transducer, and said vehicle detection apparatus comprises a switch element, and said diaxon magnetoresistive transducer is connected with said amplifier through said switch element; Said diaxon magnetoresistive transducer detects the intensity in the magnetic field of both direction, and generates the strength signal in two-way magnetic field, is sent to said amplifier through said switch element.
4. vehicle detection apparatus according to claim 3 is characterized in that, said diaxon magnetoresistive transducer is specially the twin shaft magnetoresistive transducer of intensity in the magnetic field of the both direction that detects quadrature.
5. vehicle detection apparatus according to claim 1; It is characterized in that; Said sensor is single shaft magnetoresistive transducer and twin shaft magnetoresistive transducer; Said vehicle detection apparatus comprises a switch element, and said single shaft magnetoresistive transducer is connected with said amplifier through said switch element respectively with the twin shaft magnetoresistive transducer; Said single shaft magnetoresistive transducer generates the strength signal in one tunnel magnetic field, and said twin shaft magnetoresistive transducer generates the strength signal in two-way magnetic field, all opens the unit through one and is sent to said amplifier.
6. vehicle detection apparatus according to claim 5 is characterized in that, said single shaft magnetoresistive transducer and said diaxon magnetoresistive transducer are specially the magnetoresistive transducer of intensity in the magnetic field of three directions that detect quadrature.
7. vehicle detection apparatus according to claim 5 is characterized in that said vehicle detection apparatus also comprises power supply, is connected with said processing unit.
8. vehicle detection apparatus according to claim 7 is characterized in that said vehicle detection apparatus also comprises PMU, is connected with processing unit with said power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201744307U CN202102594U (en) | 2011-05-27 | 2011-05-27 | Vehicle-detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201744307U CN202102594U (en) | 2011-05-27 | 2011-05-27 | Vehicle-detecting device |
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| Publication Number | Publication Date |
|---|---|
| CN202102594U true CN202102594U (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201744307U Expired - Lifetime CN202102594U (en) | 2011-05-27 | 2011-05-27 | Vehicle-detecting device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867419A (en) * | 2012-08-13 | 2013-01-09 | 朝为物联网技术（上海）有限公司 | Radio frequency (RF) device and system for detecting geomagnetic variation |
| CN103106809A (en) * | 2012-12-31 | 2013-05-15 | 北京时代凌宇科技有限公司 | Detecting method and device for parking car tracking positioning |
| CN103632569A (en) * | 2013-11-13 | 2014-03-12 | 北京青创智通科技有限公司 | Double-axis geomagnetic stall detecting method and double-axis geomagnetic stall detecting device |
| CN114966488A (en) * | 2021-02-24 | 2022-08-30 | 丰田自动车株式会社 | Magnetic field evaluation system for vehicle and storage medium |
-
2011
- 2011-05-27 CN CN2011201744307U patent/CN202102594U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867419A (en) * | 2012-08-13 | 2013-01-09 | 朝为物联网技术（上海）有限公司 | Radio frequency (RF) device and system for detecting geomagnetic variation |
| CN103106809A (en) * | 2012-12-31 | 2013-05-15 | 北京时代凌宇科技有限公司 | Detecting method and device for parking car tracking positioning |
| CN103632569A (en) * | 2013-11-13 | 2014-03-12 | 北京青创智通科技有限公司 | Double-axis geomagnetic stall detecting method and double-axis geomagnetic stall detecting device |
| CN103632569B (en) * | 2013-11-13 | 2016-11-23 | 雷振山 | A kind of two-axis geomagnetic method for detecting parking stalls and device |
| CN114966488A (en) * | 2021-02-24 | 2022-08-30 | 丰田自动车株式会社 | Magnetic field evaluation system for vehicle and storage medium |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CX01 | Expiry of patent term |
Granted publication date: 20120104 |