CN105513367A - Vehicle detection device - Google Patents
Vehicle detection device Download PDFInfo
- Publication number
- CN105513367A CN105513367A CN201610105641.2A CN201610105641A CN105513367A CN 105513367 A CN105513367 A CN 105513367A CN 201610105641 A CN201610105641 A CN 201610105641A CN 105513367 A CN105513367 A CN 105513367A
- Authority
- CN
- China
- Prior art keywords
- vehicle detection
- signal
- detection apparatus
- circuit
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
Abstract
The invention provides a vehicle detection device which comprises a magnetoresistive sensor, a signal amplifying circuit, a conversion circuit, a micro-control circuit (MCU) and a radio frequency module. The magnetoresistive sensor is used for converting detected magnetic field signals into analog voltage signals, the signal amplifying circuit is used for amplifying converted analog voltage signals, the conversion circuit is used for converting the analog voltage signals into digital signals, the MCU is used for collecting and detecting the digital signals, and the radio frequency module is used for receiving and/or transmitting the digital signals. The vehicle detection device can effectively traffic data collection.
Description
Technical field
The present invention relates to technical field of traffic control, particularly relate to a kind of vehicle detection apparatus.
Background technology
China's economic development is quick, and urbanization paces are constantly accelerated, and city automobile quantity is also constantly soaring, and urban traffic blocking is very serious.At present, the crossroad traffic light of China adopts the mode of set time to control mostly, cannot control traffic light flexibly according to the actual vehicle condition of road.If according to the situation of vehicle flowrate, automatically traffic light time can be adjusted, traffic system efficiency can be improved.Vehicle detection apparatus is most important traffic data collection equipment, understands real-time road, for follow-up control provides Back ground Information by it.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of vehicle detection apparatus and effectively can carries out traffic data collection.
For reaching above-mentioned purpose, the embodiment of the present invention provides a kind of vehicle detection apparatus to comprise: for the field signal detected is converted to analog voltage signal magnetoresistive transducer, be used for the described analog voltage signal after by conversion carry out amplifying signal amplifying circuit, be used for the analog voltage signal after by described amplification be converted to digital signal change-over circuit, be used for micro-control unit MCU that described digital signal is processed;
Described magnetoresistive transducer is connected with signal amplification circuit, and described signal amplification circuit is connected with change-over circuit, and described change-over circuit is connected with micro-control unit MCU.
Preferably, above-mentioned vehicle detection apparatus also comprises the degaussing circuit for applying instantaneous strong magnetic field to magnetoresistive transducer, and described degaussing circuit is connected with magnetoresistive transducer and micro-control unit MCU respectively.
Preferably, above-mentioned vehicle detection apparatus also comprises the radio-frequency module for sending described digital signal, and described micro-control unit MCU is connected with radio-frequency module.
Preferably, above-mentioned demagnetization modular circuit comprises the first demagnetization module and the second demagnetization module, and described first demagnetization module is connected with magnetoresistive transducer respectively with the second demagnetization module.
Preferably, above-mentioned magnetoresistive transducer first signal output part and secondary signal output terminal, described signal amplification circuit comprises the first signal input part and secondary signal input end that are connected with the first signal output part respectively.
Preferably, above-mentioned signal amplification circuit also comprises the 3rd signal output part, and described change-over circuit comprises the 3rd signal input part be connected with the 3rd signal output part; Change-over circuit is A/D change-over circuit.
Preferably, above-mentioned vehicle detection apparatus also comprises the power supply be connected with each circuit, described power supply Wei Li battery.
The beneficial effect of the embodiment of the present invention is: wireless vehicle detecting sensor is made up of magnetoresistive transducer, signal amplification circuit, A/D converting unit, MCU processing unit, degaussing circuit and radio-frequency module.Magnetoresistive transducer detects the changes of magnetic field because vehicle causes in real time, output voltage signal; Signal amplification circuit amplifies signal.Simulating signal after amplification is converted to digital signal and gives MCU processing unit by A/D converting unit; Signal is sent by radio-frequency module by MCU processing unit, for rear end equipment process, to adjust traffic light time in real time.When residing for magnetoresistive transducer, environment exists disturbing magnetic field, sensitivity will reduce greatly.Degaussing circuit will eliminate the magnetic hysteresis of magnetoresistive transducer, apply heavy current instantaneously and will carry out demagnetization, thus recover its sensitivity to the resistance of sensor set/reset band.
System adopts adc0809 and at89c52 chip good stability, and cost is low.Radio-frequency module is with nRF24L01 chip for core design, and it is responsible for data communication, and its current drain is low, adaptability highly versatile.。
Accompanying drawing explanation
Fig. 1 is the actual installation position view of vehicle detection apparatus of the present invention;
Fig. 2 is the structural representation of vehicle detection apparatus of the present invention;
Fig. 3 is the magnetoresistive transducer circuit diagram of vehicle detection apparatus of the present invention;
Fig. 4 is the signal amplification circuit figure of vehicle detection apparatus of the present invention;
Fig. 5 is the A/D change-over circuit circuit diagram of vehicle detection apparatus of the present invention;
Fig. 6 is the demagnetization module circuit diagram of vehicle detection apparatus of the present invention;
Fig. 7 is the microprocessing unit MCU circuit diagram of vehicle detection apparatus of the present invention;
Fig. 8 is the radio frequency module circuit figure of vehicle detection apparatus of the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with accompanying drawing, the invention will be further described, can not be used for limiting the scope of the invention.It should be noted that, when not conflicting, the various modes in the embodiment in the application and embodiment can combine mutually.
Fig. 1 is the actual installation position view of vehicle detection apparatus of the present invention, as shown in Figure 1, vehicle detection apparatus of the present invention is arranged at road edge, each edge, crossing is all provided with vehicle detection apparatus, for crossroad, crossing, east, south, west, north is respectively arranged with vehicle detection apparatus of the present invention, and the check point position of adjacent intersection is spaced, to avoid the pick-up unit between different crossing mutually to disturb, cause and detect data out of true.Vehicle detection apparatus of the present invention is not limited to diagramatic way and arranges, can operate according to actual conditions, and Fig. 1 is for ease of understanding the present invention with reference to using.
Fig. 2 is the structural representation of vehicle detection apparatus of the present invention, as shown in Figure 2, vehicle detection apparatus of the present invention comprises the magnetoresistive transducer for the field signal detected being converted to analog voltage signal, be connected with magnetoresistive transducer and the analog voltage signal after changing is carried out amplifying signal amplifying circuit, be connected to signal amplification circuit and analog voltage signal be converted to the A/D change-over circuit of digital signal, be connected with A/D change-over circuit and the micro-control unit MCU (MicrocontrollerUnit) digital signal being gathered and detects, the radio-frequency module be connected with micro-control unit MCU, and the degaussing circuit be connected with micro-control unit MCU and magnetoresistive transducer respectively.Micro-control unit MCU controls reception and the transmission that radio-frequency module carries out signal, and micro-control unit MCU also carries out work for controlling degaussing circuit simultaneously; Degaussing circuit is used for applying an instantaneous strong magnetic field to magnetoresistive transducer and recovers or keep the characteristic of sensor, and degaussing circuit will eliminate the magnetic hysteresis of magnetoresistive transducer, and magnetic resistance applies heavy current instantaneously to the resistance of sensor set/reset band and carries out demagnetization.Wherein, radio-frequency module comprises for sending described digital signal wireless transmitter module and the wireless receiving module for receiving digital signal; Vehicle detection apparatus also comprises the power supply be connected with each circuit, power supply Wei Li battery.
Fig. 3 is the magnetoresistive transducer circuit diagram of vehicle detection apparatus of the present invention, and as shown in Figure 3, comprise single-row 8 pins, wherein, 1 pin, 8 foots are connected with the first signal output part OUT1 and secondary signal output terminal OUT2 respectively; 2 pin are connected with VCC1; 3,5 pins are held with SR+ and SR-holds and is connected respectively; 4 pin ground connection; 6 pin, 7 pin ground connection respectively.Magnetoresistive transducer is a kind of magnetic field-voltage transitions sensor, and the car body of vehicle is all be made up of metal, and when vehicle can make the magnetic line of force in this region be distorted through a certain region, magnetoresistive transducer just can detect the changes of magnetic field because vehicle causes.Magnetoresistive transducer is converted field signal to voltage signal and is exported by the first output terminal OUT1 and the second output terminal OUT2.The magnetoresistive transducer model adopted in the present embodiment is HMC1021Z is the single shaft magnetoresistive transducer that a kind of 8-pinSIP encapsulates.
Fig. 4 is the signal amplification circuit figure of vehicle detection apparatus of the present invention, and as shown in Figure 4, signal amplification circuit comprises biserial pin, and often row 4 pins, are wherein connected with resistance R1 between 1 pin and 8 pin by totally 8; 2 pin first signal input parts are connected with magnetoresistive transducer first output terminal OUT1, and 3 pin are that secondary signal input end is connected with magnetoresistive transducer second output terminal OUT2; 4 pin ground connection; Electric capacity C1 is connected with between 7 pin and ground while that 7 pin being connected with VCC1; Be connected with resistance R2 between 5 pin and ground, be connected with resistance R3, one end of R2 is connected with R3, and one end is connected to ground in addition simultaneously and between power supply; 6 pin are connected with the 3rd signal output part OUT3.The model of the signal amplification circuit that this enforcement adopts is AD627, is a complete Micro Energy Lose instrument amplifier.Because the output difference sub-signal of magnetoresistive transducer is very little, for meeting the input voltage requirement of A/D converter, signal amplification circuit is needed to amplify signal, voltage signal through magneto-resistive transducer conversion passes through the first output terminal OUT1 and the second output terminal OUT2 input signal amplification circuit diagram first and second input end 2 pin and 3 pin, and the signal after amplifying is exported by the 3rd output terminal OUT3.
Fig. 5 is the A/D change-over circuit circuit diagram of vehicle detection apparatus of the present invention, and as shown in Figure 5, A/D change-over circuit has biserial pin, often row 14, totally 28 pins.Wherein 1 pin is that the 3rd signal input part IN3 is connected with the 3rd signal output part OUT3 of signal amplification circuit; Pin 17,14,15,8,18-21 is connected with UD0-UD7 respectively; 6 pin are connected with USTART; 7 pin are connected with UEOC; 9 pin are connected with UOE; 10 pin are connected with power supply VCC1; 12 pin are connected with VCC1,16 pin are connected to ground; 13 pin are connected to ground; 23,24,25 to hold with UADDA, UADDB, UADDC and be connected; 22 pin are held with UALE and are connected.The simulating signal that 3rd input end OUT3 inputs is converted to digital signal and gives MCU processing unit by A/D change-over circuit.The cmos component of the A/D change-over circuit model adopted in the present embodiment steering logic that to be ADC0809 be with 8 A/D converters, No. 8 multi-way switchs and MCU processing unit compatibility.A/D change-over circuit is used for that simulating signal is converted to digital signal and gives MCU processing unit.
Fig. 6 is the demagnetization module circuit diagram of vehicle detection apparatus of the present invention, as shown in Figure 6, demagnetization module comprises the first demagnetization module and the second demagnetization module, first demagnetization module is identical with the second demagnetization modular structure, all there is biserial pin, often row four pins, totally 8,2 pin of the first demagnetization module, 4 pin are held with USR+ and are connected; 1 pin ground connection; Resistance R4 is connected with between 3 pin and VCC1; 5 pin-8 pin are interconnected and jointly and between SR+ are connected with electric capacity C3.
2 pin, 4 pin of the second demagnetization module all with are all connected with USR-; 1 pin ground connection; 3 pin of the second demagnetization module be connected with 3 pin of the first demagnetization module and and be connected with electric capacity C2 between ground; 5 pin, 6 pin, 7 pin, 8 pin are all held with SR-and are connected.The SR+ end of the first demagnetization module and the SR-of the second demagnetization module hold and to hold with the Same Name of Ends SR+ of magnetic resistance inductor respectively and SR-holds and is connected.When residing for magnetoresistive transducer, environment exists disturbing magnetic field, the film magnetization polarity of sensor element can be damaged, and sensitivity will reduce greatly.At this moment, need to apply an instantaneous strong magnetic field to sensor recover or keep the characteristic of sensor.Degaussing circuit will eliminate the magnetic hysteresis of magnetoresistive transducer, apply heavy current instantaneously carry out demagnetization to the resistance of sensor set/reset band.The demagnetization module model adopted in the present embodiment is IRF7509.
Fig. 7 is the microprocessing unit MCU circuit diagram of vehicle detection apparatus of the present invention, as shown in Figure 7, comprises biserial pin, often row 20, and wherein pin 1-8 is respectively and is connected with UD0-UD7 respectively; Be connected with between 9 pin and supply voltage between electric capacity C11 and ground and be connected with resistance R7, and one end of electric capacity R7 is connected to ground, one end is connected with VCC1 in addition; 10 pin and 11 pin are held with USR+, USR-respectively and are connected; 21 pin-28 pin are held with UADDC, UADDB, UADDA, UALE, UClOCK, UOE, UEOC, USTART respectively and are connected; 31 ends are connected with VCC1; 34 pin-39 pin are connected with UIRQ, UMISO, UMOSI, USCK, UCSN, UCE, and and between supply voltage, be connected to resistance R13-R8; R13-R18 is connected with 34 pin-39 pin one end respectively, and one end is all connected with VCC1 in addition.The Same Name of Ends of A/D change-over circuit is connected with microprocessing unit MCU (Same Name of Ends connects description and repeats no more) respectively; Microprocessing unit MCU connection is the core of whole sensor node, carries out data acquisition and check processing, the transmitting-receiving of control radio-frequency module etc. to sensor.
Fig. 8 is the radio frequency module circuit figure of vehicle detection apparatus of the present invention, as shown in Figure 8, comprises 4 row pins, often row four pins, and 1 pin-pin is held with UCE, UCSN, USCK, UMOSI, UMISO respectively and is connected; 6 pin are held with UIRQ and are connected, and 7 pin are connected with VCC2, and 8 pin ground connection, are connected with electric capacity C4 between 9 pin and ground, be connected with electric capacity C5 between 10 pin and ground, are parallel with inductance X2 and resistance R5 between 9 pin and 10 pin; Electric capacity C6 is connected with between 11 pin and ground; 12 pin are connected with radio-frequency antenna respectively with 13 pin, and 14 pin are connected to ground; 15 pin are connected with VCC2; Be connected with resistance R6 between 16 pin and ground, 17 pin are connected to ground; 18 pin are connected with VCC2; Electric capacity C10 is connected with between 19 pin and ground; 20 pin are connected to ground.Radio-frequency module is responsible for data communication, completes the transmitting-receiving of packet.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. a vehicle detection apparatus, it is characterized in that, comprising: for the field signal detected is converted to analog voltage signal magnetoresistive transducer, be used for the described analog voltage signal after by conversion carry out amplifying signal amplifying circuit, be used for the analog voltage signal after by described amplification be converted to digital signal change-over circuit, be used for micro-control unit MCU that described digital signal is processed;
Described magnetoresistive transducer is connected with signal amplification circuit, and described signal amplification circuit is connected with change-over circuit, and described change-over circuit is connected with micro-control unit MCU.
2. vehicle detection apparatus as claimed in claim 1, is characterized in that: described vehicle detection apparatus also comprises the degaussing circuit for applying instantaneous strong magnetic field to magnetoresistive transducer, and described degaussing circuit is connected with magnetoresistive transducer and micro-control unit MCU respectively.
3. vehicle detection apparatus as claimed in claim 1, it is characterized in that: described vehicle detection apparatus also comprises the radio-frequency module for sending described digital signal, described micro-control unit MCU is connected with radio-frequency module.
4. vehicle detection apparatus as claimed in claim 2, it is characterized in that: described demagnetization modular circuit comprises the first demagnetization module and the second demagnetization module, described first demagnetization module is connected with magnetoresistive transducer respectively with the second demagnetization module.
5. vehicle detection apparatus as claimed in claim 1, it is characterized in that: described magnetoresistive transducer first signal output part and secondary signal output terminal, described signal amplification circuit comprises the first signal input part and secondary signal input end that are connected with the first signal output part respectively.
6. vehicle detection apparatus as claimed in claim 1, it is characterized in that: described signal amplification circuit also comprises the 3rd signal output part, described change-over circuit comprises the 3rd signal input part be connected with the 3rd signal output part.
7. the vehicle detection apparatus as described in claim 1 to 7 any one, is characterized in that: described change-over circuit is A/D change-over circuit.
8. the vehicle detection apparatus as described in claim 1 to 7 any one, is characterized in that: described vehicle detection apparatus also comprises the power supply be connected with each circuit, described power supply Wei Li battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610105641.2A CN105513367A (en) | 2016-02-25 | 2016-02-25 | Vehicle detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610105641.2A CN105513367A (en) | 2016-02-25 | 2016-02-25 | Vehicle detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105513367A true CN105513367A (en) | 2016-04-20 |
Family
ID=55721308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610105641.2A Pending CN105513367A (en) | 2016-02-25 | 2016-02-25 | Vehicle detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105513367A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10216760A1 (en) * | 2002-04-12 | 2003-10-23 | Ernst Bremicker Gmbh & Co Kg | Vehicle detection device for detecting a vehicle within a capture zone and controlling a traffic control device accordingly, whereby a passive magnetic sensor, e.g. a GMR, is mounted to the side of a vehicle passage |
| CN1983348A (en) * | 2005-12-14 | 2007-06-20 | 深圳市威捷机电技术有限公司 | Non-coil ground sensing system for inspecting automobile |
| KR20100134840A (en) * | 2009-06-16 | 2010-12-24 | 주식회사 우일 | Crossroads traffic information real-time collection system and method thereof |
| CN102360531A (en) * | 2011-09-30 | 2012-02-22 | 哈尔滨工业大学 | Intelligent traffic light control method and system based on wireless sensor network |
| CN202736294U (en) * | 2012-08-24 | 2013-02-13 | 成都天奥测控技术有限公司 | Wireless vehicle detection instrument |
| CN205692381U (en) * | 2016-02-25 | 2016-11-16 | 南京铁道职业技术学院 | A kind of vehicle detection apparatus |
-
2016
- 2016-02-25 CN CN201610105641.2A patent/CN105513367A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10216760A1 (en) * | 2002-04-12 | 2003-10-23 | Ernst Bremicker Gmbh & Co Kg | Vehicle detection device for detecting a vehicle within a capture zone and controlling a traffic control device accordingly, whereby a passive magnetic sensor, e.g. a GMR, is mounted to the side of a vehicle passage |
| CN1983348A (en) * | 2005-12-14 | 2007-06-20 | 深圳市威捷机电技术有限公司 | Non-coil ground sensing system for inspecting automobile |
| KR20100134840A (en) * | 2009-06-16 | 2010-12-24 | 주식회사 우일 | Crossroads traffic information real-time collection system and method thereof |
| CN102360531A (en) * | 2011-09-30 | 2012-02-22 | 哈尔滨工业大学 | Intelligent traffic light control method and system based on wireless sensor network |
| CN202736294U (en) * | 2012-08-24 | 2013-02-13 | 成都天奥测控技术有限公司 | Wireless vehicle detection instrument |
| CN205692381U (en) * | 2016-02-25 | 2016-11-16 | 南京铁道职业技术学院 | A kind of vehicle detection apparatus |
Non-Patent Citations (5)
| Title |
|---|
| 吕俊芳 等: "《传感器接口与检测仪器电路》", 28 February 2009 * |
| 吴兴福 等: "基于磁阻传感器的无线车辆检测传感器设计", 《北京汽车》 * |
| 王玮: "基于磁阻传感器的低功耗车辆检测技术研究", 《中国优秀硕士学位论文全文数据库·信息科技辑》 * |
| 谭吉祥 等: "智能交通灯控制系统的设计与实现", 《计算机与网络》 * |
| 陈朝大 等: "《单片机原理与应用—实验实训和课程设计》", 30 June 2014 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201993124U (en) | Multi-channel physical quantity measuring device | |
| CN201698588U (en) | Vehicle detection system based on double earth inductors | |
| CN101217002A (en) | A wireless transducer network device based on unloading lot detection based on magnetic sensitive technology | |
| CN102627115A (en) | Method and device for monitoring vehicle coming on railway based on geomagnetic anomaly | |
| CN101661057B (en) | Device for implementing power measurement based on resistance sampling by linear optocoupler | |
| CN104332056A (en) | Wireless vehicle detection device and detection method thereof | |
| CN109756269A (en) | A kind of visible light communication reception circuit | |
| CN203055147U (en) | Meter reading collector with switching power supply and power line carrier transceiving gain | |
| CN106161876B (en) | A kind of circuit inhibiting Earth noise interference | |
| CN105513367A (en) | Vehicle detection device | |
| CN205692381U (en) | A kind of vehicle detection apparatus | |
| CN201413576Y (en) | Piezoelectric traffic flow investigation system | |
| CN203455487U (en) | FPGA-based multifunctional electrical transmitter | |
| CN103491485A (en) | Dual-voice-coil horn D-class digital amplification system and signal processing method thereof | |
| CN201497776U (en) | Device for realizing power measurement based on resistance sampling by adopting linear photoelectric coupler | |
| CN202584299U (en) | Vehicle detection device based on ZigBee and giant magneto resistors (GMRs) | |
| CN205015397U (en) | Wireless frequency monitoring devices who charges | |
| CN201114405Y (en) | Remote sensing CCD camera driving circuit | |
| CN104766377A (en) | Frequency conversion identification system with rapid processing function | |
| CN202686391U (en) | Railway train approach monitoring device based on geomagnetic anomaly | |
| CN203405795U (en) | Receiving and transmitting circuit of infrared touch screen and infrared touch screen | |
| CN105137173A (en) | Wireless charging frequency monitoring device | |
| CN201247534Y (en) | Voice prompting device for traffic signal of municipal traffic intersection | |
| CN208044041U (en) | The AC220 outputs state detection circuits that mutual inductor combination monostable circuit is realized | |
| CN201303327Y (en) | Special-purpose short-range communication trackside device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160420 |
|
| RJ01 | Rejection of invention patent application after publication |