CN1478687A - Pulse width coding induction type absolute locator - Google Patents
Pulse width coding induction type absolute locator Download PDFInfo
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- CN1478687A CN1478687A CNA021143609A CN02114360A CN1478687A CN 1478687 A CN1478687 A CN 1478687A CN A021143609 A CNA021143609 A CN A021143609A CN 02114360 A CN02114360 A CN 02114360A CN 1478687 A CN1478687 A CN 1478687A
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- train
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- address mark
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Abstract
An absolute locator based on pulse width encoding and electromagnetic induction principle for magnetic levitation train is disclosed. The train-carried active sensor can scan the inactive position marking plates, which are arranged along the railway and have the address code generated by specially processing the electrically conducting metal on it. The train-carried reader can read the position information on the making plates. Its advantages are high anti-interference power and correctness, and low cost.
Description
Technical field
The present invention relates to a kind of absolute pointing device of rail mounted train.
Background technology
For the safe operation of magnetic-levitation train, the speed closed loop control of the accurate location of realization train and lead must be installed locomotive velocity measuring on magnetic-levitation train and location is put system.For common wheel rail railway, mainly by track circuit be installed in position and the speed that photoelectric encoder on the wheel is determined train, because magnetic-levitation train does not have wheel, do not contact between vehicle and the track during operation, therefore to the testing the speed and locate the method for measurement that to quote traditional railway of magnetic-levitation train, must study the method for locating speed measurement that makes new advances.
In the position fixing system that tests the speed of at present domestic magnetic suspension train, generally adopt the relative positioning method to measure the position of train, and the error of relative positioning can be along with time integral, so must will revise the position of train at a certain distance.This invents a kind of just device that is used to measure the magnetic suspension train absolute location.And this invention not only adapts to magnetic suspension train, equally also can be applicable to the absolute fix of common wheel track railway.
Summary of the invention
The objective of the invention is to measure the absolute location of track train, have accurate positioning, reliability height, characteristics such as with low cost and easy for installation.
The absolute pointing device according to the present invention mainly comprises the induction reader that is installed on the car body, is installed in address mark plate two parts of track both sides.
Description of drawings
Fig. 1 is address mark plate scheme drawing (unit is millimeter, and is as follows).
Fig. 2 is vehicle-mounted reader scheme drawing.
Fig. 3 is the Address Recognition principle schematic.
Fig. 4 is the transmission circuit scheme drawing.
Fig. 5 is the acceptor circuit scheme drawing.
Embodiment
The principle of work of absolute pointing device is by vehicle-mounted active sensor (abbreviation reader) track passive site identification plate along the line (abbreviation identification plate) to be scanned, and obtains location information.Address code on the identification plate is to realize by the conducting metal on the identification plate being carried out special processing.Identification plate is installed on the fixed position of track both sides.The location information on the identification plate was read in the variation of electromagnetic field when vehicle-mounted reader passed through identification plate by measuring.More high-performance electromagnetic wave emission can guarantee that system is not subjected to the interference of extraneous rain, snow and electromagnetism.And system works alone fully, and is irrelevant with train operation state.
As shown in Figure 2, vehicle-mounted reader is a U type groove, the cooresponding 1 group of coil (another group coil among the figure designs for system redundancy) that is distributed with on the cell wall on both sides, and the long 10cm of coil, wide 3cm is made by coiling of 10 circle copper or printed circuit board (PCB).Wherein Yi Bian coil is a transmitter coil, and another side is a receiving coil.Address code on the tick lables plate is worked out by cutting on metal sheet.Transmitter coil passes to the sinusoidal alternating current I=I of certain amplitude, certain frequency
mSin (ω t).According to electromagnetic induction principle, can produce induced voltage E on another receiving coil.From the energy point of view analysis, when conducting metal is put into the magnetic field of variation, in metal, will produce certain electric current (electromagnetic eddy), can consume part energy.Simultaneously, identification plate also has certain reflex to electromagnetic wave.So, the identification plate slotting position the induced voltage E1 that produces of right coil, than slotting position not the induced voltage E2 that produces of right coil big, have the relation of E1＞E2.Get fixed VREF (Voltage Reference) V
Ref, satisfy E1＞V
RefThe relation of＞E2.Just can determine by comparing induced voltage whether the pairing identification plate of coil zone slots.
Address code is to work out by the slot pitch difference of slotting on the identification plate.As shown in Figure 3, first group of slot pitch L0 is as the canonical reference slot pitch, and the slot pitch L of binary data bit＞L0 represents binary one (being designated as L2), and slot pitch L＜L0 represents Binary Zero (being designated as L1).
The Address Recognition principle as shown in Figure 3, when train when the identification plate, at first the edge of identification plate can block coil, produces a low level, as initial signal, the preparation reading.Time interval through first group of groove is a canonical reference time T 0, time interval T1, T2, T3, the T4 of 4 groups of grooves after record passes through successively later on.If Ti＞T0, then i bit address position is 1; If Ti＜T0, then i bit address position is 0 (i=1,2,3,4), thereby can identify the address information on the identification plate.
General identification plate relatively shorter (50cm is following), and the acceleration ratio of train is lower (less than 1.5m/s
2), as long as guarantee L2＞L0, L1＜L0 has certain allowance, just can ignore the influence of acceleration/accel and high-speed cruising, thinks that train at the uniform velocity passes through identification plate.Thereby the difference of slot pitch length just is reflected as the gap of time, further is converted into binary address information by judgement.Calculate with the data instance in the accompanying drawing 1, consider two kinds of limiting cases:
1. train is with initial velocity 500km/h, acceleration/accel 1.5m/s
2Pass through identification plate.The address information of identification plate is 1110, consider last right time T 4 whether less than T0.
Known: V
0=500km/h=139m/s a=1.5m/s
2L
0=0.04m L
1=0.02m L
2=0.06m
By formula: V
0T
0+ aT
0 2/ 2=L
0V
4 2-V
0 2=2a (L
0+ 3L
2) V
4T
4+ aT
4 2/ 2=L
1
Draw: T
0=0.29ms T
4=0.14ms T
0＞T
4
2. train is with initial velocity 500km/h, acceleration/accel-1.5m/s
2Pass through identification plate.The address information of identification plate is 1111, consider last right time T 4 whether greater than T0.
Known: V
0=500km/h=139m/s a=-1.5m/s
2L
0=0.04m L
1=0.02m L
2=0.06m
By formula: V
0T
0+ aT
0 2/ 2=L
0V
4 2-V
0 2=2a (L
0+ 3L
2) V
4T
4+ aT
4 2/ 2=L
2
Draw: T
0=0.29ms T
4=0.43ms T
0＜T
4
As seen under the situation of train high speed, high acceleration operation, absolute pointing device fully can normal operation.
The hardware circuit of system mainly comprises two parts: transmission circuit (as Fig. 4) and reception judging circuit (as Fig. 5).Transmission circuit is fairly simple, mainly is the pure oscillation signal that produces certain frequency, by launching behind gain-adjusted, the power gain.Acceptor circuit mainly be to the small-signal that induction receives amplify, after the Filtering Processing by envelope detection circuit filtering high-frequency signal, the signal that extracts low frequency variations carries out voltage ratio, draws digital signal.In judging circuit, need get a VREF (Voltage Reference), owing to reasons such as emission voltage fluctuations, can cause the fluctuation of induced voltage, if be taken as fixing VREF (Voltage Reference), may cause system's erroneous judgement.For the reliability of enhanced system can extract transmitting terminal voltage voltage for referencial use, because being approximated to direct ratio, induced voltage and transmitting terminal voltage changes, so when the transmitting terminal change of voltage, VREF (Voltage Reference) also can change thereupon, make the reliable part enhancing of differentiation of data.
In concrete application process, absolute pointing device is formed the position fixing system of train together as the redundancy of relative positioning system.Each identification plate comprises 4 bit address information, can 4 be used in combination, and 16 binary address sign indicating number is provided.As placing group mark plates every 100 meters, can translate length of line is L=100 * 2
16=6500km.By increasing or reduce the quantity of identification plate, make the application of system unrestricted.In order further to guarantee the reliability of locating data, two groups of coils (as Fig. 1) can be installed on reader, two groups of coils are redundant each other, read data successively.Two secondary data are compared, if identically think that then data are correct and keep, if differently then think error in data and abandoning.When having double error, correct data can obtain by the location information of last time and the mileage number weighting of enforcement.
Considering the needs of train two way, can transform identification plate, is axle with the right hand edge of identification plate, and the image copying identification plate gets final product.Also can oppositely directed each other identification plate be installed in the track both sides, when train travels with different directions, read the identification plate of different sides.
Identification plate is made simply in this absolute pointing device, and is easy for installation, do not need substantially to safeguard, very low for a large amount of place in operation costs.And the antijamming capability of vehicle-mounted reader is strong, and accuracy of reading is a kind of ideal style of magnetic suspension train absolute fix, and the installation site of this sensor is slightly made an amendment, and also can use in the absolute fix of wheel track railway and go.
Claims (8)
1. absolute pointing device that is applied to guideway vehicle, its feature comprises the vehicle-mounted reader (3) that is installed on car body (1) two bottom sides, and is installed in the passive address mark plate (4) on the track (2).
2. absolute pointing device according to claim 1 is characterized in that vehicle-mounted reader (3) outward appearance is a U type groove, the cooresponding induction coil that is distributed with on the cell wall of both sides.
3. vehicle-mounted reader according to claim 2 (3) is that location information on the identification plate (4) is read in the variation of electromagnetic field when measuring through identification plate (4).
4. absolute pointing device according to claim 1 is characterized in that address mark plate (4) is conductive metal sheet or the sheet material that is covered with conducting metal.
5. address mark plate according to claim 4 (4) is characterized in that the positioning address sign indicating number is by working out at fluting on the metal sheet or on the metal level.
6. address mark plate according to claim 4 (4) is characterized in that the positioning address sign indicating number is to discern by the spacing difference of slotting position.
7. address mark plate according to claim 4 (4) is characterized in that two standard cell being arranged as the baseline trough distance at the plate edge.
8. address mark plate according to claim 4 (4), when considering the train two way, can image copying identification plate (4); Oppositely directed identification plate (4) perhaps is installed in the track both sides, when train travels with different directions, is read the identification plate (4) of different sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021143609A CN1478687A (en) | 2002-08-27 | 2002-08-27 | Pulse width coding induction type absolute locator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021143609A CN1478687A (en) | 2002-08-27 | 2002-08-27 | Pulse width coding induction type absolute locator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1478687A true CN1478687A (en) | 2004-03-03 |
Family
ID=34142040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021143609A Pending CN1478687A (en) | 2002-08-27 | 2002-08-27 | Pulse width coding induction type absolute locator |
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| Country | Link |
|---|---|
| CN (1) | CN1478687A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934806A (en) * | 2010-09-07 | 2011-01-05 | 中国人民解放军国防科学技术大学 | High-precision speed measurement positioning method and system for medium and low-speed maglev trains |
| CN102650687A (en) * | 2011-02-23 | 2012-08-29 | 宏碁股份有限公司 | Electronic device and positioning method thereof |
| CN107121149A (en) * | 2017-07-13 | 2017-09-01 | 中国人民解放军国防科学技术大学 | A kind of high-speed magnetic floating rail based on eddy current effect examines absolute mileage reading device |
| CN107121150A (en) * | 2017-07-13 | 2017-09-01 | 中国人民解放军国防科学技术大学 | A kind of high-speed magnetic floating rail based on giant magnetoresistance effect examines absolute mileage reading device |
| CN107921598A (en) * | 2015-07-24 | 2018-04-17 | 斯蒂沃控股有限公司 | The work supporting block with encoder element for production equipment |
| CN110104027A (en) * | 2019-05-27 | 2019-08-09 | 上海电气泰雷兹交通自动化系统有限公司 | A kind of localization method of wheel-rail train |
| CN112729089A (en) * | 2020-12-28 | 2021-04-30 | 无锡广联数字传感科技有限公司 | Displacement sensor applied to multiple occasions |
| CN113075736A (en) * | 2021-03-24 | 2021-07-06 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Magnetic suspension train absolute positioning equipment and method |
| CN113619651A (en) * | 2021-09-01 | 2021-11-09 | 中车株洲电力机车有限公司 | Magnetic-levitation train, speed-measuring and positioning method and system, track and metal toothed slot plate |
-
2002
- 2002-08-27 CN CNA021143609A patent/CN1478687A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101934806B (en) * | 2010-09-07 | 2012-11-14 | 中国人民解放军国防科学技术大学 | High-precision speed measurement positioning method and system for medium and low-speed maglev trains |
| CN101934806A (en) * | 2010-09-07 | 2011-01-05 | 中国人民解放军国防科学技术大学 | High-precision speed measurement positioning method and system for medium and low-speed maglev trains |
| CN102650687A (en) * | 2011-02-23 | 2012-08-29 | 宏碁股份有限公司 | Electronic device and positioning method thereof |
| CN107921598A (en) * | 2015-07-24 | 2018-04-17 | 斯蒂沃控股有限公司 | The work supporting block with encoder element for production equipment |
| US10365637B2 (en) | 2015-07-24 | 2019-07-30 | Stiwa Holding Gmbh | Workpiece carrier with a code element for a production unit |
| CN107121149A (en) * | 2017-07-13 | 2017-09-01 | 中国人民解放军国防科学技术大学 | A kind of high-speed magnetic floating rail based on eddy current effect examines absolute mileage reading device |
| CN107121150A (en) * | 2017-07-13 | 2017-09-01 | 中国人民解放军国防科学技术大学 | A kind of high-speed magnetic floating rail based on giant magnetoresistance effect examines absolute mileage reading device |
| CN107121149B (en) * | 2017-07-13 | 2023-08-29 | 中国人民解放军国防科学技术大学 | High-speed magnetic levitation track absolute mileage reading device based on eddy current effect |
| CN107121150B (en) * | 2017-07-13 | 2023-08-29 | 中国人民解放军国防科学技术大学 | High-speed magnetic levitation track absolute mileage reading device based on giant magnetoresistance effect |
| CN110104027A (en) * | 2019-05-27 | 2019-08-09 | 上海电气泰雷兹交通自动化系统有限公司 | A kind of localization method of wheel-rail train |
| CN112729089A (en) * | 2020-12-28 | 2021-04-30 | 无锡广联数字传感科技有限公司 | Displacement sensor applied to multiple occasions |
| CN113075736A (en) * | 2021-03-24 | 2021-07-06 | 通号(北京)轨道工业集团有限公司轨道交通技术研究院 | Magnetic suspension train absolute positioning equipment and method |
| CN113619651A (en) * | 2021-09-01 | 2021-11-09 | 中车株洲电力机车有限公司 | Magnetic-levitation train, speed-measuring and positioning method and system, track and metal toothed slot plate |
| CN113619651B (en) * | 2021-09-01 | 2023-09-05 | 中车株洲电力机车有限公司 | Magnetic levitation train, speed measuring and positioning method and system, track and metal tooth slot plate |
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