CN101814238B - Loop vehicle detector and vehicle detection method - Google Patents
Loop vehicle detector and vehicle detection method Download PDFInfo
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- CN101814238B CN101814238B CN 201010148307 CN201010148307A CN101814238B CN 101814238 B CN101814238 B CN 101814238B CN 201010148307 CN201010148307 CN 201010148307 CN 201010148307 A CN201010148307 A CN 201010148307A CN 101814238 B CN101814238 B CN 101814238B
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Abstract
The invention provides a loop vehicle detector which is internally provided with a plurality of external feeder lines, a secondary coil inductance connected with the external feeder lines, a channel scanning circuit connected with the secondary coil inductance and a singlechip connected with the channel scanning circuit, wherein the singlechip controls the channel scanning circuit to open the next input channel and close the previous one; and when the singlechip detects that the connection between one of the input channels and the external feeder lines is interrupted, the singlechip shields the input channels and detects the next input channel, thereby shortening the scanning period, accelerating the scanning frequency, enhancing the system precision and improving the reliability of data acquisition compared with the prior art.
Description
Technical field
The present invention relates to a kind of Loop Vehicle Detector and vehicle checking method, particularly a kind of Loop Vehicle Detector and vehicle checking method that improves the data acquisition reliability.
Background technology
Loop Vehicle Detector is as the front end of urban traffic signal machine, for traffic control system provides magnitude of traffic flow raw information, for optimization control scheme provides raw information; Perhaps this Loop Vehicle Detector can be used as coil form electric police grasp shoot control module.The principle of work of Loop Vehicle Detector is: when vehicle was in the detection territory of inductive coil, the toroid winding inductance value changed, and changed indication by corresponding predetermined oscillation frequency and detected the existence of vehicle in the territory or pass through; Vehicle carries out the vehicle flowrate counting during by coil, and relies on the Time Calculation vehicle average velocity of vehicle by the front and back coil.From the above mentioned, the data acquisition of Loop Vehicle Detector is mainly finished by each passage coil oscillation frequency changed, therefore the passage sequential scanning circuit of high reliability is exactly a technology emphasis of toroid winding detecting device, and in the sweep circuit of present Loop Vehicle Detector, it is bigger to crosstalk during high-frequency signal transmission, especially many group high-frequency signal lines near the time particularly evident, greatly influenced the reliability of data acquisition.
Therefore, need a kind of new Loop Vehicle Detector to address the above problem.
Summary of the invention
At the existing problem and shortage of above-mentioned existing Loop Vehicle Detector, the purpose of this invention is to provide a kind of Loop Vehicle Detector and vehicle checking method, this Loop Vehicle Detector and vehicle checking method can improve the data acquisition reliability.
For achieving the above object, the present invention can adopt following technical scheme: a kind of Loop Vehicle Detector has some outside feeder lines, the secondary inductance that is connected with outside feeder line, the passage sweep circuit that connects secondary inductance and the single-chip microcomputer of interface channel sweep circuit in this Loop Vehicle Detector; Has multiselect one circuit in the described passage sweep circuit, this multiselect one circuit has the corresponding input channel of some and outside feeder line, and make synchronization can only have the signal of an outside feeder line to import into input channel, make next input channel open and close by Single-chip Controlling and close an input channel; When single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel.
The present invention is compared with prior art: by Single-chip Controlling passage sweep circuit, make next input channel open and close and close an input channel; When single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel; Thereby shorten the scan period, accelerate sweep frequency and improve system's degree of accuracy, the reliability of data acquisition is improved with respect to prior art.
For achieving the above object, the present invention also can adopt following technical scheme: a kind of vehicle checking method, wagon detector is provided, has the single-chip microcomputer of some outside feeder lines, the passage sweep circuit that is connected with outside feeder line and interface channel sweep circuit in this wagon detector; Has multiselect one circuit in the described passage sweep circuit, this multiselect one circuit has the corresponding input channel of some and outside feeder line, and make synchronization can only have the signal of an outside feeder line to import into this input channel, make input channel scanning one by one in order by Single-chip Controlling; Imbed described outside feeder line underground, when vehicle passes through, outside feeder line produces induction and produces signal and import into and to detect in the input channel and via single-chip microcomputer, when single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel.
The present invention is compared with prior art: make input channel scanning one by one in order by Single-chip Controlling; Imbed described outside feeder line underground, when vehicle passes through, outside feeder line produces induction and produces signal and import into and to detect in the input channel and via single-chip microcomputer, when single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel; Use this kind scan mode to shorten the scan period, accelerate sweep frequency and improve system's degree of accuracy, the reliability of data acquisition is improved with respect to prior art.
Description of drawings
Fig. 1 is the electrical block diagram of Loop Vehicle Detector of the present invention.
Fig. 2 is the structural representation of passage sweep circuit in the Loop Vehicle Detector of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand following embodiment only is used to the present invention is described and is not used in and limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
See also shown in Figure 1, electrical block diagram for Loop Vehicle Detector of the present invention, wherein, have some outside feeder lines, the secondary inductance that is connected with outside feeder line, the passage sweep circuit that connects secondary inductance and the single-chip microcomputer of interface channel sweep circuit in this Loop Vehicle Detector; Please consult shown in Figure 2 again, the squaring circuit that comprises multiselect one circuit, the capacitance three-point type oscillating circuit that is connected with multiselect one circuit and connection capacitance three-point type oscillating circuit in the described passage sweep circuit, this multiselect one circuit has the corresponding input channel of some and outside feeder line, but the equal transmission signals of each input channel is to multiselect one circuit.
Please consult Fig. 2 again and in conjunction with shown in Figure 1, wherein said multiselect one circuit can adopt four to select a circuit as required, or eight select a circuit, or 16 select a circuit etc.Selecting a circuit with eight is example, promptly this circuit has eight input channels, but each bar passage all transmission signals eight selects in the circuit to this, and synchronization can only have the signal of an outside feeder line to input to input channel, make input channel scanning one by one in order by the single-chip microcomputer feedback control signal with control, i.e. control makes next input channel open and close and closes an input channel; When single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, Loop Vehicle Detector has a bright lamp of display lamp reports to the police, and single-chip microcomputer is a feedback control signal with this input channel shielding and detect next input channel.Use this kind sequential scan mode can prevent signal cross-talk, close the passage that feeder line opens circuit automatically, shorten the scan period, accelerate sweep frequency and improve system's degree of accuracy.
See also shown in Figure 2ly, enter in the capacitance three-point type oscillating circuit and conversion of signals become oscillator signal and transfer in the squaring circuit from the signal of multiselect one circuit output.This capacitance three-point type oscillating circuit is a prior art, and its advantage improves the direct current biasing of oscillator signal for improving the quiescent point of entire circuit, makes oscillator signal stable.In the present invention, some input channels of described multiselect one circuit can shared this capacitance three-point type oscillating circuit, can guarantee the stability and the simplified structure of every input channel input signal.Oscillator signal transfers in the squaring circuit back and changes into square-wave signal and transfer in the single-chip microcomputer by transferring to squaring circuit, and is detected to finish the testing of whole wagon detector by single-chip microcomputer.
When needs carry out vehicle detection, some feeder lines of this Loop Vehicle Detector are imbedded underground that vehicle passes through, when vehicle passes through from the ground, outside feeder line produces induction and produces signal and import into to be conveyed in the input channel and via above-mentioned detection step and detect in the single-chip microcomputer, thereby finishes whole testing process.Loop Vehicle Detector in this kind vehicle checking method adopts sequential scan mode, and can close the passage that feeder line opens circuit automatically, thereby shorten the scan period, accelerate sweep frequency and improve system's degree of accuracy, the reliability of data acquisition and efficient are improved greatly with respect to prior art.
Claims (10)
1. a Loop Vehicle Detector has some outside feeder lines, the secondary inductance that is connected with outside feeder line, the passage sweep circuit that connects secondary inductance and the single-chip microcomputer of interface channel sweep circuit in this Loop Vehicle Detector; It is characterized in that: have multiselect one circuit in the described passage sweep circuit, this multiselect one circuit has the corresponding input channel of some and outside feeder line, and make synchronization can only have the signal of an outside feeder line to import into input channel, make input channel scanning one by one in order by the single-chip microcomputer feedback control signal with control, i.e. control makes next input channel open and close and closes an input channel; When single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel.
2. Loop Vehicle Detector according to claim 1, it is characterized in that: also comprise a capacitance three-point type self-excited oscillator in the passage sweep circuit of described Loop Vehicle Detector, public this capacitance three-point type self-excited oscillator of described some input channels.
3. Loop Vehicle Detector according to claim 1 and 2, it is characterized in that: also comprise a squaring circuit in the passage sweep circuit of described Loop Vehicle Detector, this squaring circuit will change into square-wave signal from the signal of described input channel input and be input in the single-chip microcomputer.
4. Loop Vehicle Detector according to claim 3 is characterized in that: described multiselect one circuit adopts four to select a circuit or eight to select a circuit or 16 to select a circuit.
5. Loop Vehicle Detector according to claim 4 is characterized in that: also be provided with alarm lamp on the described Loop Vehicle Detector, when described single-chip microcomputer detected wherein an input channel and interrupts with being connected of outside feeder line, alarm lamp was bright.
6. a vehicle checking method is characterized in that: wagon detector is provided, has the single-chip microcomputer of some outside feeder lines, the passage sweep circuit that is connected with outside feeder line and interface channel sweep circuit in this wagon detector; Has multiselect one circuit in the described passage sweep circuit, this multiselect one circuit has the corresponding input channel of some and outside feeder line, and make synchronization can only have the signal of an outside feeder line to import into this input channel, make input channel scanning one by one in order by Single-chip Controlling; Imbed described outside feeder line underground, when vehicle passes through, outside feeder line produces induction and produces signal and import into and to detect in the input channel and via single-chip microcomputer, when single-chip microcomputer detects when interrupting being connected of wherein an input channel and outside feeder line, single-chip microcomputer is with this input channel shielding and detect next input channel.
7. vehicle checking method according to claim 6 is characterized in that: also comprise a capacitance three-point type self-excited oscillator in the passage sweep circuit of described wagon detector, public this capacitance three-point type self-excited oscillator of described a plurality of input channels.
8. according to claim 6 or 7 described vehicle checking methods, it is characterized in that: also comprise a squaring circuit in the described passage sweep circuit, and use this squaring circuit that the signal of described input channel input is changed into square-wave signal to be input in the single-chip microcomputer.
9. according to claim 6 or 7 described vehicle checking methods, it is characterized in that: be connected with secondary inductance between described outside feeder line and the passage sweep circuit, when the inductance of outside feeder line changes, thereby cause that secondary inductance changes to provide signal to the passage sweep circuit.
10. vehicle checking method according to claim 6 is characterized in that: described multiselect one circuit is to adopt four to select a circuit or eight to select a circuit or 16 to select a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010148307 CN101814238B (en) | 2010-04-15 | 2010-04-15 | Loop vehicle detector and vehicle detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010148307 CN101814238B (en) | 2010-04-15 | 2010-04-15 | Loop vehicle detector and vehicle detection method |
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| CN101814238A CN101814238A (en) | 2010-08-25 |
| CN101814238B true CN101814238B (en) | 2011-10-19 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578279A (en) * | 2013-11-21 | 2014-02-12 | 北方工业大学 | Method and device for detecting annular coil vehicle |
| CN105279976A (en) * | 2015-11-26 | 2016-01-27 | 南京莱斯信息技术股份有限公司 | Self-adaptive wireless vehicle detector |
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| SU737978A1 (en) * | 1977-08-30 | 1980-05-30 | Предприятие П/Я Г-4437 | Contact-free magnetic mass presence sensor |
| JP2001006087A (en) * | 1999-06-23 | 2001-01-12 | Parking System Technology Kk | Vehicle detecting method |
| EP1103938A1 (en) * | 1999-05-25 | 2001-05-30 | Matsushita Electric Industrial Co., Ltd. | Electromagnetic wave lane marker, device for detecting electromagnetic wave lane marker, and traffic system |
| CN2836132Y (en) * | 2005-11-14 | 2006-11-08 | 张永军 | Loop coil vehicle detector |
| CN201035762Y (en) * | 2007-02-09 | 2008-03-12 | 张万勤 | Vehicle single channel electronic control apparatus |
| CN101311982A (en) * | 2007-05-22 | 2008-11-26 | 深圳市哈工大交通电子技术有限公司 | Vehicle assorted check detection device and method |
| KR20090055788A (en) * | 2007-11-29 | 2009-06-03 | 서울통신기술 주식회사 | Road side equipment and method for measuring using the one |
| WO2009145384A1 (en) * | 2008-05-27 | 2009-12-03 | Jeong Jun Lee | The combined loop type auto-mobile sensor using loop coil and parking information system the same |
| CN201369103Y (en) * | 2009-03-16 | 2009-12-23 | 安徽科力信息产业有限责任公司 | On-road vehicle detecting device based on proximity inductive sensor technology |
| CN201435148Y (en) * | 2009-04-29 | 2010-03-31 | 上海宝康电子控制工程有限公司 | DSP-based embedding-type wireless high-definition electronic police |
-
2010
- 2010-04-15 CN CN 201010148307 patent/CN101814238B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU737978A1 (en) * | 1977-08-30 | 1980-05-30 | Предприятие П/Я Г-4437 | Contact-free magnetic mass presence sensor |
| EP1103938A1 (en) * | 1999-05-25 | 2001-05-30 | Matsushita Electric Industrial Co., Ltd. | Electromagnetic wave lane marker, device for detecting electromagnetic wave lane marker, and traffic system |
| JP2001006087A (en) * | 1999-06-23 | 2001-01-12 | Parking System Technology Kk | Vehicle detecting method |
| CN2836132Y (en) * | 2005-11-14 | 2006-11-08 | 张永军 | Loop coil vehicle detector |
| CN201035762Y (en) * | 2007-02-09 | 2008-03-12 | 张万勤 | Vehicle single channel electronic control apparatus |
| CN101311982A (en) * | 2007-05-22 | 2008-11-26 | 深圳市哈工大交通电子技术有限公司 | Vehicle assorted check detection device and method |
| KR20090055788A (en) * | 2007-11-29 | 2009-06-03 | 서울통신기술 주식회사 | Road side equipment and method for measuring using the one |
| WO2009145384A1 (en) * | 2008-05-27 | 2009-12-03 | Jeong Jun Lee | The combined loop type auto-mobile sensor using loop coil and parking information system the same |
| CN201369103Y (en) * | 2009-03-16 | 2009-12-23 | 安徽科力信息产业有限责任公司 | On-road vehicle detecting device based on proximity inductive sensor technology |
| CN201435148Y (en) * | 2009-04-29 | 2010-03-31 | 上海宝康电子控制工程有限公司 | DSP-based embedding-type wireless high-definition electronic police |
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| CN101814238A (en) | 2010-08-25 |
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