CN201413576Y - Piezoelectric traffic flow investigation system - Google Patents
Piezoelectric traffic flow investigation system Download PDFInfo
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- CN201413576Y CN201413576Y CN2009201270712U CN200920127071U CN201413576Y CN 201413576 Y CN201413576 Y CN 201413576Y CN 2009201270712 U CN2009201270712 U CN 2009201270712U CN 200920127071 U CN200920127071 U CN 200920127071U CN 201413576 Y CN201413576 Y CN 201413576Y
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Abstract
The utility model discloses a piezoelectric traffic flow investigation system which is characterized by comprising n groups of sensor groups, 2n groups of signal amplification circuits, an AD conversion circuit and a data processing main-board, wherein n is a positive integer, each of sensor groups consists of a front piezoelectric sensor and a back piezoelectric sensor, and the front and the backpiezoelectric sensors in each of the sensor groups are embedded under the same lane pavement, the signal output end of each sensor is connected with the signal input end of each group of the signal amplification circuit in one-one correspondence, the signal output end of the signal amplification circuit is connected with the data input end of the AD conversion circuit, the data output end of theAD conversion circuit is connected with the signal input end of the data processing main-board, and the data processing main-board can analyze and process received data. The piezoelectric traffic flowinvestigation system can work around the clock under unattended conditions, obtains traffic data with higher precision, and has low cost.
Description
Technical field
The utility model belongs to the transport information technical field, a kind of specifically traffic flow detection system that is used for gathering highway section traffic.
Background technology
The traffic of investigation highway is a Basic Ways of obtaining traffic data, is the important foundation work of carrying out current situation of traffic analysis, prediction transport development prospect, circuit improvement and traffic programme.
The traffic data that obtains in the traffic study mainly comprises vehicle flowrate, vehicle, car Taoist monastic name, the speed of a motor vehicle, current direction, transit time etc.At present, the method for traffic study mainly contains two big classes: a class is the artificial observation method, and a class is automatic observation method.The artificial observation method is widely applicable, adaptability strong, maneuverability, but needs great amount of manpower, and is costly, and precision is difficult for guaranteeing the not enough detailed complete of the traffic data that obtains.Automatically observation method mainly utilizes equipment such as ground induction coil, video, radio radar, ultrasound wave, infrared ray, laser, but equipment complexity, damage easily, cost an arm and a leg, can't large tracts of land promote, or it is too big influenced by weather condition, can't guarantee round-the-clock operate as normal, precision is not enough, causes than mistake easily.
The utility model content
The purpose of this utility model provides a kind of piezoelectric type traffic flow investigation system, can be under complete unattended situation, and round-the-clock operate as normal is obtained the traffic data of degree of precision, and with low cost, is convenient to large tracts of land and promotes.
For achieving the above object, the utility model is explained a kind of piezoelectric type traffic flow investigation system, its key is: include n group sensor groups, 2n organizes signal amplification circuit, A/D convertor circuit and data processing mainboard, n is a positive integer, every group of sensor groups is made up of preceding piezoelectric transducer and back piezoelectric transducer, arrange before and after preceding piezoelectric transducer in described every group of sensor groups and the back piezoelectric transducer and be embedded under the same carriageway surfacing, the signal output part of each sensor and the signal input part of every group of signal amplification circuit connect one to one, the signal output part of signal amplification circuit is connected with the data input pin of described A/D convertor circuit, the data output end of this A/D convertor circuit connects the signal input part of data processing main plate, and this data processing mainboard carries out analyzing and processing to the data that receive.
It is in order better to analyze the current direction of vehicle that two piezoelectric transducers are set in a track.When vehicle is pressed onto preceding piezoelectric transducer on the track and back during piezoelectric transducer, two piezoelectric transducer generation deformation, and convert deformation to electric signal and export to signal amplification circuit, after signal amplification circuit amplifies this signal, the output amplifying signal is given A/D convertor circuit, after A/D convertor circuit carries out analog to digital conversion to this amplifying signal, the output digital signal is given the data processing mainboard, the data processing mainboard carries out data processing to the digital signal that receives, and analyzes to obtain traffic data from this digital signal.
The group that sensor groups can be set according to the number of track-lines on actual road surface is counted n, buries one group of sensor groups in each track underground.
If sensor buries too deeply, can reduce the sensitivity of sensor, if bury too shallowly, sensor damages easily, and is therefore restricted to the depth of burying of sensor.The depth of burying of piezoelectric transducer and back piezoelectric transducer is 1-2 centimetre before described.
Therefore two sensors is separated by too near, can cause relatively difficulty of data processing, and it is far away to be separated by, and may measure inaccurately, needs to select the suitable interval distance.Piezoelectric transducer and the back piezoelectric transducer 2-5 rice of being separated by before in described every group of sensor groups.
Described signal amplification circuit is by amplifying chip, filter capacitor, first diode, second diode, first pull down resistor, second pull down resistor, current-limiting resistance, feedback resistance, first, second, the 3rd, the 4th divider resistance and four-way switch are formed, first negative input of described amplification chip is connected with the signal output part of described sensor, this first normal phase input end that amplifies chip is through the first pull down resistor ground connection, cross-over connection feedback resistance between first output terminal of amplification chip and first negative input, this first output terminal connects filter capacitor one end through the first via switch of four-way switch, this first output terminal also is connected in series first, second, the 3rd, ground connection behind the 4th divider resistance, the common port of first divider resistance and second divider resistance is connected an end of second way switch of four-way switch, the other end of second way switch is connected with filter capacitor one end, the common port of second divider resistance and the 3rd divider resistance is connected an end of the Third Road switch of four-way switch, the other end of Third Road switch is connected with filter capacitor one end, the 3rd divider resistance is connected an end of the four-way switch of four-way switch with the common port of the 4th divider resistance, the other end of four-way switch is connected with filter capacitor one end, the negative electrode that connects second diode behind the other end serial connection current-limiting resistance of filter capacitor, the other end of this filter capacitor also connects second reverse input end that amplifies chip, second positive input that amplifies chip is through the second pull down resistor ground connection, second output terminal that amplifies chip connects the negative electrode of first diode, the anode of first diode is connected with described second reverse input end, described second output terminal also connects the anode of second diode, and the negative electrode of second diode outputs signal to described A/D convertor circuit.
Sensor output signal is through amplifying first negative input input of chip, amplify back output through two-stage, four-way switch and first, second, third, fourth divider resistance can be regulated the gain that amplify the second level, filter capacitor elimination direct current disturbs, first diode, second diode are used to prevent that negative signal from exporting to A/D convertor circuit after amplification filtering, cause the damage of A/D convertor circuit.
According to Ministry of Communications's agreement, at set intervals, must upload the traffic data statistical information of previous time period to data center of Ministry of Communications, for this reason, the utility model also includes the GPRS wireless router, and this GPRS wireless router is connected described data processing mainboard by wireless network with data center of Ministry of Communications.By the GPRS wireless router, data center of Ministry of Communications can also send instruction to the data processing mainboard, the work of control data processing main plate.
Remarkable result of the present utility model is: can be under complete unattended situation, round-the-clock operate as normal, obtain the traffic data of degree of precision, structure and simple to operate, easy to maintenance, saved manpower and materials, with low cost, and piezoelectric transducer to bury installation underground also fairly simple, be convenient to large tracts of land and promote.Can also communicate with data center of Ministry of Communications simultaneously, meet the requirement of Ministry of Communications's agreement.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is a piezoelectric transducer position view of the present utility model;
Fig. 3 is the structural representation of embodiment 1;
Fig. 4 is the piezoelectric transducer position view of embodiment 1;
Fig. 5 is the circuit connection diagram of embodiment 1;
Fig. 6 is a signal amplification circuit connection diagram among the embodiment 1;
Fig. 7 is the circuit connection diagram of embodiment 2.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Embodiment 1:
As Fig. 1,2,3,4, shown in 5: a kind of piezoelectric type traffic flow investigation system, include 2 groups of sensor groups 7,4 groups of signal amplification circuits 3, A/D convertor circuit 4 and data processing mainboard 5, every group of sensor groups 7 is made up of preceding piezoelectric transducer 1 and back piezoelectric transducer 2, preceding piezoelectric transducer 1 in described every group of sensor groups 7 and back piezoelectric transducer 2 are separated by to arrange before and after 3 meters and are embedded in following 1 centimetre of same carriageway surfacing, the signal input part of the signal output part of each sensor and every group of signal amplification circuit 3 connects one to one, the signal output part of signal amplification circuit 3 is connected with the data input pin of described A/D convertor circuit 4, the data output end of this A/D convertor circuit 4 connects the signal input part of data processing main plate 5, and the data of 5 pairs of receptions of this data processing mainboard are carried out analyzing and processing.
Described A/D convertor circuit 4 adopts PCM-8208BS type AD capture card, and the model of described data processing mainboard 5 is EPC-8000I.
As shown in Figure 6: described signal amplification circuit 3 amplifies chip U by the LF353 type, filter capacitor C, the first diode D1, the second diode D2, the first pull down resistor R3, the second pull down resistor R2, current-limiting resistance R1, feedback resistance R4, first, second, the 3rd, the 4th divider resistance R5, R6, R7, R8 and SW DIP-4 type four-way switch S form, first negative input-IN2 of described amplification chip U is connected with the signal output part of described sensor, this first normal phase input end+IN2 that amplifies chip U is through the first pull down resistor R3 ground connection, cross-over connection feedback resistance R4 between the first output terminal OUT2 of amplification chip U and the first negative input-IN2, this first output terminal OUT2 connects filter capacitor C one end through the first via switch of four-way switch S, this first output terminal OUT2 also is connected in series first, second, the 3rd, the 4th divider resistance R5, R6, R7, ground connection behind the R8, the common port of the first divider resistance R5 and the second divider resistance R6 is connected an end of second way switch of four-way switch S, the other end of second way switch is connected with filter capacitor C one end, the common port of the second divider resistance R6 and the 3rd divider resistance R7 is connected an end of the Third Road switch of four-way switch S, the other end of Third Road switch is connected with filter capacitor C one end, the 3rd divider resistance R7 is connected an end of the four-way switch of four-way switch S with the common port of the 4th divider resistance R8, the other end of four-way switch is connected with filter capacitor C one end, the negative electrode that connects the second diode D2 behind the other end serial connection current-limiting resistance R1 of filter capacitor C, the other end of this filter capacitor C also connects the second reverse input end-IN1 that amplifies chip U, second positive input+the IN1 that amplifies chip U is through the second pull down resistor R2 ground connection, the second output terminal OUT1 that amplifies chip U connects the negative electrode of the first diode D1, the anode of the first diode D1 is connected with described second reverse input end-IN1, the described second output terminal OUT1 also connects the anode of the second diode D2, and the negative electrode of the second diode D2 outputs signal to described A/D convertor circuit 4.
Shown in Fig. 1,3,5: native system also includes GPRS wireless router 6, and this GPRS wireless router 6 is connected described data processing mainboard 5 by wireless network with data center of Ministry of Communications.
Its principle of work is:
It is in order better to analyze the current direction of vehicle that two piezoelectric transducers are set in a track.When vehicle is pressed onto preceding piezoelectric transducer 1 on the track and back piezoelectric transducer 2, two piezoelectric transducer generation deformation, and convert deformation to electric signal and export to signal amplification circuit 3, after signal amplification circuit amplifies this signal, the output amplifying signal is given A/D convertor circuit 4, after 4 pairs of these amplifying signals of A/D convertor circuit carry out analog to digital conversion, the output digital signal is given data processing mainboard 5, the data processing mainboard carries out data processing to the digital signal that receives, and analyzes to obtain traffic data from this digital signal.
According to Ministry of Communications's agreement, at set intervals, data processing mainboard 5 can be uploaded the traffic data statistical information of previous time period by GPRS wireless router 6 to data center of Ministry of Communications, data center of Ministry of Communications can also send instruction to data processing mainboard 5, the work of control data processing main plate 5.
Embodiment 2:
As shown in Figure 7: present embodiment and embodiment 1 structure are roughly the same, and its difference is: the sensor groups 7 in the present embodiment is 4 groups, and signal amplification circuit 3 is 8 groups.
In the utility model not the connection of detailed description and structure be prior art in this area, do not describe in detail at this.
Claims (5)
1, a kind of piezoelectric type traffic flow investigation system, it is characterized in that: include n group sensor groups (7), 2n organizes signal amplification circuit (3), A/D convertor circuit (4) and data processing mainboard (5), n is a positive integer, every group of sensor groups (7) is made up of preceding piezoelectric transducer (1) and back piezoelectric transducer (2), arrange before and after preceding piezoelectric transducer (1) in described every group of sensor groups (7) and the back piezoelectric transducer (2) and be embedded under the same carriageway surfacing, the signal input part of the signal output part of each sensor and every group of signal amplification circuit (3) connects one to one, the signal output part of signal amplification circuit (3) is connected with the data input pin of described A/D convertor circuit (4), the data output end of this A/D convertor circuit (4) connects the signal input part of data processing main plate (5), and this data processing mainboard (5) carries out analyzing and processing to the data that receive.
2, piezoelectric type traffic flow investigation according to claim 1 system is characterized in that: before described piezoelectric transducer (1) and afterwards the depth of burying of piezoelectric transducer (2) be 1-2 centimetre.
3, piezoelectric type traffic flow investigation according to claim 1 system is characterized in that: piezoelectric transducer (1) and back piezoelectric transducer (2) the 2-5 rice of being separated by before in described every group of sensor groups (7).
4, piezoelectric type traffic flow investigation according to claim 1 system, it is characterized in that: described signal amplification circuit (3) is by amplifying chip (U), filter capacitor (C), first diode (D1), second diode (D2), first pull down resistor (R3), second pull down resistor (R2), current-limiting resistance (R1), feedback resistance (R4), first, second, the 3rd, the 4th divider resistance (R5, R6, R7, R8) and four-way switch (S) form, first negative input of described amplification chip (U) is connected with the signal output part of described sensor, this first normal phase input end that amplifies chip (U) is through first pull down resistor (R3) ground connection, cross-over connection feedback resistance (R4) between first output terminal of amplification chip (U) and first negative input, this first output terminal connects filter capacitor (C) end through the first via switch of four-way switch (S), this first output terminal also is connected in series first, second, the 3rd, the 4th divider resistance (R5, R6, R7, R8) back ground connection, first divider resistance (R5) is connected an end of second way switch of four-way switch (S) with the common port of second divider resistance (R6), the other end of second way switch is connected with filter capacitor (C) end, second divider resistance (R6) is connected an end of the Third Road switch of four-way switch (S) with the common port of the 3rd divider resistance (R7), the other end of Third Road switch is connected with filter capacitor (C) end, the 3rd divider resistance (R7) is connected an end of the four-way switch of four-way switch (S) with the common port of the 4th divider resistance (R8), the other end of four-way switch is connected with filter capacitor (C) end, other end serial connection current-limiting resistance (R1) back of filter capacitor (C) connects the negative electrode of second diode (D2), the other end of this filter capacitor (C) also connects second reverse input end that amplifies chip (U), second positive input that amplifies chip (U) is through second pull down resistor (R2) ground connection, second output terminal that amplifies chip (U) connects the negative electrode of first diode (D1), the anode of first diode (D1) is connected with described second reverse input end, described second output terminal also connects the anode of second diode (D2), and the negative electrode of second diode (D2) outputs signal to described A/D convertor circuit (4).
5, piezoelectric type traffic flow investigation according to claim 1 system, it is characterized in that: also include GPRS wireless router (6), this GPRS wireless router (6) is connected described data processing mainboard (5) by wireless network with data center of Ministry of Communications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201270712U CN201413576Y (en) | 2009-04-20 | 2009-04-20 | Piezoelectric traffic flow investigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201270712U CN201413576Y (en) | 2009-04-20 | 2009-04-20 | Piezoelectric traffic flow investigation system |
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| CN201413576Y true CN201413576Y (en) | 2010-02-24 |
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| CN2009201270712U Expired - Lifetime CN201413576Y (en) | 2009-04-20 | 2009-04-20 | Piezoelectric traffic flow investigation system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944290A (en) * | 2010-09-14 | 2011-01-12 | 深圳职业技术学院 | Traffic survey instrument and traffic survey method |
| CN102063795A (en) * | 2010-12-27 | 2011-05-18 | 交通运输部公路科学研究所 | System, method and device for acquiring information of intensive traffic flow |
| CN103134553A (en) * | 2013-01-31 | 2013-06-05 | 长安大学 | System and method of piezoelectric electricity self-generating speed and distance intelligent monitoring |
| CN103366562A (en) * | 2012-09-12 | 2013-10-23 | 国家纳米科学中心 | Traffic monitoring sensor and detection method |
| CN105825676B (en) * | 2016-05-26 | 2019-01-08 | 浙江索菱新能源汽车科技有限公司 | A kind of road vehicles traveling monitoring system based on Internet of Things |
-
2009
- 2009-04-20 CN CN2009201270712U patent/CN201413576Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101944290A (en) * | 2010-09-14 | 2011-01-12 | 深圳职业技术学院 | Traffic survey instrument and traffic survey method |
| CN101944290B (en) * | 2010-09-14 | 2012-06-06 | 深圳职业技术学院 | Traffic survey method |
| CN102063795A (en) * | 2010-12-27 | 2011-05-18 | 交通运输部公路科学研究所 | System, method and device for acquiring information of intensive traffic flow |
| CN102063795B (en) * | 2010-12-27 | 2015-01-21 | 交通运输部公路科学研究所 | System, method and device for acquiring information of intensive traffic flow |
| CN103366562A (en) * | 2012-09-12 | 2013-10-23 | 国家纳米科学中心 | Traffic monitoring sensor and detection method |
| CN103366562B (en) * | 2012-09-12 | 2016-04-06 | 北京纳米能源与系统研究所 | traffic monitoring sensor and detection method |
| CN103134553A (en) * | 2013-01-31 | 2013-06-05 | 长安大学 | System and method of piezoelectric electricity self-generating speed and distance intelligent monitoring |
| CN103134553B (en) * | 2013-01-31 | 2015-08-12 | 长安大学 | A kind of speed of a motor vehicle of piezoelectric self electricity and spacing intelligent monitor system and method |
| CN105825676B (en) * | 2016-05-26 | 2019-01-08 | 浙江索菱新能源汽车科技有限公司 | A kind of road vehicles traveling monitoring system based on Internet of Things |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20100224 |
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| CX01 | Expiry of patent term |