CN101751787A - Multifunctional vehicle intelligent testing sensor and testing method thereof - Google Patents
Multifunctional vehicle intelligent testing sensor and testing method thereof Download PDFInfo
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- CN101751787A CN101751787A CN200810238807A CN200810238807A CN101751787A CN 101751787 A CN101751787 A CN 101751787A CN 200810238807 A CN200810238807 A CN 200810238807A CN 200810238807 A CN200810238807 A CN 200810238807A CN 101751787 A CN101751787 A CN 101751787A
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- 238000012360 testing method Methods 0.000 title claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 29
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- 238000004804 winding Methods 0.000 description 1
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Abstract
The invention provides a multifunctional vehicle intelligent testing sensor. The sensor comprises a power supply module, a geomagnetism sensitive element module and a control and communication module, wherein the geomagnetism sensitive element module comprises two sets of geomagnetism sensitive elements, a bias current circuit and a setting current circuit; the control and communication module comprises a single chip, a digital filtering module and a communication interface module. The invention provides a multifunctional vehicle intelligent testing sensor which has self-adaption, multifunction and can detect the flow, speed, occupation ratio, length and type of the tested vehicle. The sensor is based on the geomagnetism sensitive element and uses the embedded single chip as the core.
Description
Technical field
The invention belongs to traffic behavior detecting sensor technical field, relate in particular to multiple traffic behavior and realize Intelligent Measurement Design of Sensor and implementation method.
Background technology
It is the important prerequisite of carrying out traffic flow control and traffic administration such as inducing that road traffic state obtains, be the necessary basis of formulating traffic insurance measures such as traffic safety management strategy, traffic hazard detection, the analysis of traffic hazard reason, be the traffic infrastructure management, monitor and safeguard the indispensable firsthand information.Therefore to obtain be the basic major issue that traffic administration, traffic insurance and traffic infrastructure monitoring are safeguarded to traffic behavior.
The basis that traffic behavior obtains is a physical sensors, and used sensor type is a lot of in the road traffic system, as is used for the toroid winding, video image, radar of control of traffic and road, sensor such as infrared, ultrasonic; Sensors such as infrared, the radar that is used for that traffic safety ensures, ess-strain, ultrasonic, gas; Be used for the sensors such as temperature, pressure, ess-strain, gas, image of road infrastructure monitoring etc.Along with development of Urban Traffic, traffic system becomes and becomes increasingly complex, but above-mentioned these only towards one, two kind of fixation application and the sensor commonly used that not exclusively possesses functions such as self-adaptation, multi-functional networking can not satisfy the needs of Modern Traffic control, therefore development is used for the self-adaptation that traffic behavior obtains, but the novel intelligent sensor of multi-functional networking has great importance and practical value, these technology also are the key restriction technology of next step development of intelligent transportation system simultaneously, are the bases that constitutes Automatic Highway System.
Summary of the invention
The invention provides and a kind ofly possess self-adaptation, multi-functionally possess the flow that detects vehicular traffic, speed, occupation rate, vehicle commander, and the multifunctional traffic Vehicular intelligent detecting sensor and the detection method of vehicle simultaneously.
Multifunctional traffic Vehicular intelligent sensor of the present invention, by power module, magnetic-sensitive elements module and control and communication module three parts form, wherein, ground magnetic-sensitive elements module comprises two groups of ground magnetic-sensitive elements, bias current circuit and set current circuit, control comprises single-chip microcomputer, digital filtering module and communication interface module with communication module, and described single-chip microcomputer comprises control module, external bus interface, data processing module and A/D interface; Power module is respectively ground magnetic-sensitive elements module and control and communication module power supply; The simulating signal of ground magnetic-sensitive elements is eliminated interference parameter after the A/D interface of single-chip microcomputer is passed to data processing module by the control and the digital filtering module of communication module, and the digital signal after the processing is transferred to host computer through external bus interface and communication module.
Multifunctional traffic Vehicular intelligent sensor of the present invention is characterized in that, digital filtering module has adopted the wave digital lowpass filter based on triumphant damp window design FIR.
Multifunctional traffic Vehicular intelligent sensor of the present invention is characterized in that power module adopts external 24V power supply and 5V lithium battery power supply.
Multifunctional traffic Vehicular intelligent sensor of the present invention is characterized in that, every group of ground magnetic-sensitive elements comprises a single shaft and highly sensitive ground of a twin shaft magnetic-sensitive elements.
Multifunctional traffic Vehicular intelligent sensor of the present invention is characterized in that, what single-chip microcomputer adopted is the high-performance processor of the dsPIC series of Microchip company.
Multifunctional traffic Vehicular intelligent sensor of the present invention is characterized in that communication interface module comprises CAN bus, external storage and RS232.
Multifunctional traffic Vehicular intelligent detecting sensor detection method of the present invention is characterized in that described detection method is based on the ground magnetic-sensitive elements, is core with embedded single-chip microcomputer, based on the detection method of the telecommunication flow information of multicore sheet.
Multifunctional traffic Vehicular intelligent detecting sensor detection method of the present invention, it is characterized in that the automobile storage based on described sensor is that utilization ground magnetic-sensitive elements detects the vehicle terrestrial magnetic field image signal that is produced when vehicle passes through at the sensor place or stops in detection method, handle through single-chip microcomputer, and confirm the existence of sensor place or do not have vehicle, simultaneously testing result is exported.
The detection method of multifunctional traffic Vehicular intelligent detecting sensor of the present invention, it is characterized in that based on the computing method of the vehicle flowrate occupancy of ground magnetic-sensitive elements being: in a period of time T1, detect the time t of each car through sensor, and each car obtained through the time t accumulative total addition of sensor all cars utilize T2 can obtain one section vehicle flowrate occupancy in the set time T1 divided by T1 through the temporal summation T2 of sensors in this section time T 1.
The detection method of multifunctional traffic Vehicular intelligent detecting sensor of the present invention, it is characterized in that, be based on the information of two described sensors, writing time, the computing method that obtain the speed of a motor vehicle are: two sensors A are fixed on the different geographic position with B, utilize automobile storage can obtain same car successively by two sensors A, the time T 1 of B, T2 in detection method, utilize between sensors A and the B apart from S divided by the mistiming of time T 1 with T2.
The detection method of multifunctional traffic Vehicular intelligent detecting sensor of the present invention, the accurate detecting method that it is characterized in that the highway section vehicle flowrate of automobile storage whether is: in a period of time T, when detect automobile storage the time, single-chip microcomputer sends to its inner rolling counters forward instruction, count number and saving result, represent a car process, second car is through out-of-date, the results added of counting once and last time preserving is also preserved, and finishes until time T by that analogy.
The detection method of multifunctional traffic Vehicular intelligent detecting sensor of the present invention, it is characterized in that the vehicle calculation methods of length is: when vehicle enters the sensor scope, because the sensor surrounding magnetic field that vehicle causes changes, cause the sensor internal change in voltage, limit a threshold value, when surpassing this value, voltage represents that automobile storage exists, the moment when in like manner detecting vehicle and leaving, the mistiming t that enters and go out that writes down when passing through independent sensor according to each car, and the speed of a motor vehicle v that obtains of car speed computing method, multiply by the speed of a motor vehicle with the time and promptly obtain vehicle length.
Description of drawings
Fig. 1 is multifunctional traffic Vehicular intelligent Fundamentals of Sensors structural drawing
Fig. 2 is multifunctional traffic Vehicular intelligent sensor detecting method flow chart of data processing figure
Among the figure: 101, power module, 102 ground magnetic-sensitive elements modules, 103 controls and communication module, 201 flow chart of data processing figure, 202 ground magnetic-sensitive elements are corrected subroutine.
Embodiment
As Fig. 1 is multifunctional traffic Vehicular intelligent Fundamentals of Sensors structural drawing, by power module, magnetic-sensitive elements module and control and communication module three parts form, wherein, magnetic-sensitive elements module in ground comprises two groups of ground magnetic-sensitive elements, bias current circuit and set current circuit; Control comprises single-chip microcomputer, digital filtering module and communication interface module with communication module.It is based on geomagnetic sensor, with embedded single-chip microcomputer is core, detection method based on the telecommunication flow information of multicore sheet, realization traffic flow control, the state forecast and the early warning of traffic insurance and traffic infrastructure status monitoring, possesses the flow that detects vehicular traffic, speed, occupation rate, the vehicle commander, reach measuring ability to car shape, when the sensor network that the configuration traffic behavior obtains, obtain condition and characteristic sensor according to traffic behavior, reasonable disposition physical sensors and virtual-sensor, adopt and directly to measure traffic behavior and the flexible measurement method acquisition traffic behavior that combines, increase the controllability of obtaining traffic behavior.
As Fig. 2, described sensor is after starting working, and magnetic-sensitive elements resets at first over the ground, and measures the parameter of need of work automatically according to job requirement.Magnetic field around need learning before detection in the multifunctional traffic Vehicular intelligent geomagnetic sensor is then according to the definite parameter that detects of the size of surrounding magnetic field.
Carry out coherent detection then:
Whether automobile storage is.When there is vehicle at intelligence sensor of the present invention place, no matter whether static, ground magnetic-sensitive elements in the sensor detects reliably because the field signal that the effect of vehicle causes unusual, handle through single-chip microcomputer, and confirm the existence of sensor place or do not have vehicle, simultaneously testing result is exported.
The vehicle flowrate occupancy.Promptly in a period of time, as 30s, utilize automobile storage can obtain the time t of each car through sensor in detection method, the addition of the t of each car accumulative total is obtained the temporal summation T of this section all cars process sensors in the time, utilize time T divided by 30, can obtain the vehicle flowrate occupancy in one period set time.
The mensuration of the speed of a motor vehicle.Two groups of ground magnetic-sensitive elements are arranged among the present invention, the measurement of the speed of a motor vehicle is based on the information of two ground magnetic-sensitive elements, obtain the computing method of the speed of a motor vehicle thus, be about to two sensors A and B stationkeeping, utilize automobile storage can obtain same car successively by time T 1, the T2 of two sensors A and B in detection method, that utilizes two sensors obtains the speed of a motor vehicle apart from S divided by time T 1 and time T 2.
The mensuration of highway section vehicle flowrate.In a period of time, when detect automobile storage the time, the counter of the single-chip microcomputer inside technology that adds up finishes to draw total car number until during this period of time.
Car two length calculation.The mistiming t that enters and go out that writes down during magnetic-sensitive elements through one group of ground according to each car, and the vehicle velocity V that obtains of car speed computing method utilize speed V to multiply by time t again, obtain the length of this car.
In order to improve the analysis of harmonic precision, need carry out low-pass filtering treatment to the signal before analyzing, remove the interference of denoising and unwanted frequency composition.The present invention has increased digital filtering module, and described digital filtering module has adopted the wave digital lowpass filter of triumphant damp window design FIR, and it is at the aspects such as estimation of filtration, detection and the parameter of signal, and digital filter is to use the most a kind of linear system.Owing to often be mingled with noise and garbage signal composition in the signal, so must be with these interference component filterings.Filtering is the basis of signal Processing, can screen signal, only allows the signal of special frequency channel pass through.
The setting sampling frequency is 1000Hz, requires in passband 0≤f≤90Hz decay less than 1dB, stopband 150Hz≤f≤+ the last frequency of fadings of ∞ is greater than 40dB, and hn is unit impulse response, and then the MATLAB program of the FIR wave digital lowpass filter that designs with triumphant damp window is as follows:
Wave digital lowpass filter with triumphant damp window design FIR
f＝1000；fp＝90；fs＝150；rs＝50；
wp＝2×pi×fp÷f；ws＝2×pi×fs÷f；
DB＝ws□wp；
beta＝0.5842×(rs□21)^0.4+0.07886×(rs□21)；
M＝ceil((rs□8)÷2.285÷DB)；
wc＝(wp+ws)÷2÷pi；
hn＝firl(M，wc，kaiser(M+1，beta))；
n＝0；M；[H，w]＝freqz(hn，1)；
subplot(1，2，1)；stem(n，hn，’.’)；
Title (' amplitude-versus-frequency curve '); Xlabel (' n '); Ylabel (' h (n) ');
subplot(1，2，2)；plot(w/pi，20×log10(abs(H)))；
Title (' loss function curve '); Xlabel (' omega/pi '); Ylabel (' 201g| (Hg (omega) | ')
Claims (10)
1. multifunctional traffic Vehicular intelligent sensor, it is characterized in that, by power module, magnetic-sensitive elements module and control and communication module three parts form, wherein, ground magnetic-sensitive elements module comprises two groups of ground magnetic-sensitive elements, bias current circuit and set current circuit, control comprises single-chip microcomputer, digital filtering module and communication interface module with communication module, and described single-chip microcomputer comprises control module, external bus interface, data processing module and A/D interface; Power module is respectively ground magnetic-sensitive elements module and control and communication module power supply; The simulating signal of ground magnetic-sensitive elements is eliminated interference parameter after the A/D interface of single-chip microcomputer is passed to data processing module by the control and the digital filtering module of communication module, and the digital signal after the processing is transferred to host computer through external bus interface and communication module.
2. multifunctional traffic Vehicular intelligent sensor as claimed in claim 1 is characterized in that digital filtering module has adopted the wave digital lowpass filter based on triumphant damp window design FIR.
3. multifunctional traffic Vehicular intelligent sensor as claimed in claim 1 is characterized in that every group of ground magnetic-sensitive elements comprises a single shaft and highly sensitive ground of a twin shaft magnetic-sensitive elements.
4. multifunctional traffic Vehicular intelligent sensor as claimed in claim 1 is characterized in that communication interface module comprises CAN bus, external storage and RS232.
5. the detection method of utilizing multifunctional traffic Vehicular intelligent sensor as claimed in claim 1 to realize, it is characterized in that, described detection method is based on the ground magnetic-sensitive elements, is core with embedded single-chip microcomputer, based on the detection method of the telecommunication flow information of multicore sheet.
6. as claim 5 multifunctional traffic Vehicular intelligent detecting sensor detection method, it is characterized in that the automobile storage based on described sensor is that utilization ground magnetic-sensitive elements detects the vehicle terrestrial magnetic field image signal that is produced when vehicle passes through at the sensor place or stops in detection method, handle through single-chip microcomputer, and confirm the existence of sensor place or do not have vehicle, simultaneously testing result is exported.
7. as claim 5 multifunctional traffic Vehicular intelligent detecting sensor detection method, it is characterized in that based on the computing method of the vehicle flowrate occupancy of ground magnetic-sensitive elements being: in a period of time T1, detect the time t of each car through sensor, and each car obtained through the time t accumulative total addition of sensor all cars utilize T2 can obtain one section vehicle flowrate occupancy in the set time T1 divided by T1 through the temporal summation T2 of sensors in this section time T 1.
8. as claim 5 multifunctional traffic Vehicular intelligent detecting sensor detection method, it is characterized in that, be based on the information of two described sensors, writing time, the computing method that obtain the speed of a motor vehicle are: two sensors A are fixed on the different geographic position with B, utilize automobile storage can obtain same car successively by two sensors A, the time T 1 of B, T2 in detection method, utilize between sensors A and the B apart from S divided by the mistiming of time T 1 with T2.
9. as claim 5 multifunctional traffic Vehicular intelligent detecting sensor detection method, the accurate detecting method that it is characterized in that the highway section vehicle flowrate of automobile storage whether is: in a period of time T, when detect automobile storage the time, single-chip microcomputer sends to its inner rolling counters forward instruction, count number and saving result, represent a car process, second car is through out-of-date, the results added of counting once and last time preserving is also preserved, and finishes until time T by that analogy.
10. as claim 5 multifunctional traffic Vehicular intelligent detecting sensor detection method, it is characterized in that the vehicle calculation methods of length is: when vehicle enters the sensor scope, because the sensor surrounding magnetic field that vehicle causes changes, cause the sensor internal change in voltage, limit a threshold value, when surpassing this value, voltage represents that automobile storage exists, the moment when in like manner detecting vehicle and leaving, the mistiming t that enters and go out that writes down when passing through independent sensor according to each car, and the speed of a motor vehicle v that obtains of car speed computing method, multiply by the speed of a motor vehicle with the time and promptly obtain vehicle length.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908278A (en) * | 2010-08-09 | 2010-12-08 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN101923781A (en) * | 2010-07-28 | 2010-12-22 | 北京交通大学 | Vehicle type recognizing method based on geomagnetic sensing technology |
| CN102496286A (en) * | 2011-12-12 | 2012-06-13 | 无锡米兰磁传感网络有限公司 | Transportation vehicle detection sensor |
| CN102542809A (en) * | 2010-12-22 | 2012-07-04 | 无锡物联网产业研究院 | Method and system for detecting traffic information, and magnetic sensitive sensor nodes |
| CN103456176A (en) * | 2013-08-19 | 2013-12-18 | 程雄 | Processing method of magnetic field sensing signals of vehicle detecting device |
| CN104064032A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Vehicle induction detection device based on microprocessor |
| CN104183141A (en) * | 2014-08-28 | 2014-12-03 | 哈尔滨工程大学 | Wireless geomagnetism carport detector based on Internet of Things |
| CN104900069A (en) * | 2015-06-24 | 2015-09-09 | 西安华舜测量设备有限责任公司 | Micro-power-consumption magnetic signal detection device and application method thereof |
| CN105052084A (en) * | 2013-03-15 | 2015-11-11 | 思科技术公司 | Allocating computing resources based upon geographic movement |
| CN105607138A (en) * | 2016-01-05 | 2016-05-25 | 上海斐讯数据通信技术有限公司 | Anti-interference circuit and method for geomagnetic sensor |
| CN107895491A (en) * | 2017-11-16 | 2018-04-10 | 湖南工业大学 | Vehicle count pulse generating device based on earth magnetism sensing |
| CN110442991A (en) * | 2019-08-12 | 2019-11-12 | 江南大学 | A kind of dynamic sulfur recovery soft-measuring modeling method based on parametrization FIR model |
| CN115083183A (en) * | 2022-06-11 | 2022-09-20 | 杨立柱 | Intelligent induction lamp system for expressway |
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2008
- 2008-12-03 CN CN200810238807A patent/CN101751787A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101923781A (en) * | 2010-07-28 | 2010-12-22 | 北京交通大学 | Vehicle type recognizing method based on geomagnetic sensing technology |
| CN101923781B (en) * | 2010-07-28 | 2013-11-13 | 北京交通大学 | Vehicle type recognizing method based on geomagnetic sensing technology |
| CN101908278B (en) * | 2010-08-09 | 2013-12-18 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN101908278A (en) * | 2010-08-09 | 2010-12-08 | 北京交通发展研究中心 | Wireless magnetic induction intensity vehicle detection method and device |
| CN102542809A (en) * | 2010-12-22 | 2012-07-04 | 无锡物联网产业研究院 | Method and system for detecting traffic information, and magnetic sensitive sensor nodes |
| CN102542809B (en) * | 2010-12-22 | 2014-06-04 | 无锡物联网产业研究院 | Method and system for detecting traffic information, and magnetic sensitive sensor nodes |
| CN102496286A (en) * | 2011-12-12 | 2012-06-13 | 无锡米兰磁传感网络有限公司 | Transportation vehicle detection sensor |
| CN105052084A (en) * | 2013-03-15 | 2015-11-11 | 思科技术公司 | Allocating computing resources based upon geographic movement |
| CN105052084B (en) * | 2013-03-15 | 2018-11-27 | 思科技术公司 | Method and system based on geographical mobile distribution computing resource |
| CN104064032A (en) * | 2013-03-19 | 2014-09-24 | 成都凯智科技有限公司 | Vehicle induction detection device based on microprocessor |
| CN103456176A (en) * | 2013-08-19 | 2013-12-18 | 程雄 | Processing method of magnetic field sensing signals of vehicle detecting device |
| CN104183141A (en) * | 2014-08-28 | 2014-12-03 | 哈尔滨工程大学 | Wireless geomagnetism carport detector based on Internet of Things |
| CN104900069A (en) * | 2015-06-24 | 2015-09-09 | 西安华舜测量设备有限责任公司 | Micro-power-consumption magnetic signal detection device and application method thereof |
| CN105607138A (en) * | 2016-01-05 | 2016-05-25 | 上海斐讯数据通信技术有限公司 | Anti-interference circuit and method for geomagnetic sensor |
| CN107895491A (en) * | 2017-11-16 | 2018-04-10 | 湖南工业大学 | Vehicle count pulse generating device based on earth magnetism sensing |
| CN110442991A (en) * | 2019-08-12 | 2019-11-12 | 江南大学 | A kind of dynamic sulfur recovery soft-measuring modeling method based on parametrization FIR model |
| CN110442991B (en) * | 2019-08-12 | 2021-05-04 | 江南大学 | Dynamic sulfur recovery soft measurement modeling method based on parameterized FIR (finite Impulse response) model |
| CN115083183A (en) * | 2022-06-11 | 2022-09-20 | 杨立柱 | Intelligent induction lamp system for expressway |
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Open date: 20100623 |