EP1453714A1 - Verfahren und system zur detektion von objekten längs eines geleises - Google Patents
Verfahren und system zur detektion von objekten längs eines geleisesInfo
- Publication number
- EP1453714A1 EP1453714A1 EP02774656A EP02774656A EP1453714A1 EP 1453714 A1 EP1453714 A1 EP 1453714A1 EP 02774656 A EP02774656 A EP 02774656A EP 02774656 A EP02774656 A EP 02774656A EP 1453714 A1 EP1453714 A1 EP 1453714A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- detectors
- track
- response signals
- signals
- detector
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 38
- 238000001514 detection method Methods 0.000 title claims description 11
- 238000005481 NMR spectroscopy Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000009466 transformation Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L1/00—Devices along the route controlled by interaction with the vehicle or train
- B61L1/02—Electric devices associated with track, e.g. rail contacts
- B61L1/08—Electric devices associated with track, e.g. rail contacts magnetically actuated; electrostatically actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L29/00—Safety means for rail/road crossing traffic
Definitions
- the present invention relates to a method and a system for the detection of objects along a track according to the preamble of patent claims 1 and 10, respectively.
- Proof of whether a section of track or a section of track is occupied by a railroad car can be made, for example, with the following means: i) sections of track are monitored with so-called axle counters. The axes are counted both when a train enters a section of the route and when it leaves the section concerned, and if this is the same, this section of the route is released. ii) Specially shorter track sections such as Turnouts are secured with so-called track circuits in which one rail is electrically insulated from the other rail. When driving on such a section, an electric circuit is closed by the wheels of an axle and an occupied state can thereby be derived.
- the techniques mentioned above work reliably, but they are limited to the occupancy of a track section by railroad cars and locomotives. A car that got stuck on a level crossing, for example, cannot be found using the above-mentioned means.
- the method with the track circuits is subject to malfunctions in winter service with salt use, for example in the area of train stations or level crossings, because the salt water on the route has a relatively low resistance and forms a flat electrical line between two rails. This effect of false detections occurs both in a direct current circuit and when using a signal of a few kHz. Repeating a measurement within a few seconds does not provide any new status information.
- Vehicle Presence System discloses a system in which passive magnetic detectors are arranged along a railroad track in the track bed in order to determine the track occupancy in the vicinity of a level crossing Comparison of signals that were previously stored in the absence of objects and signals that were recorded at a point in time determined by the detection and with the stored signals
- the present invention is therefore based on the object of specifying a method and a system for the detection of objects along a track, which can be implemented with little circuitry complexity, is independent of direct and indirect weather influences and also monitors a route, including the immediate surroundings scalable resolution allowed.
- a response signals to a pulse packet sent to detectors are detected;
- B the recorded response signals are transformed into a signal in the frequency domain;
- the response signals transformed into the frequency space are compared with previously stored response signals which were stored in the absence of an object in accordance with method steps A and B, a determined inequality being assessed as the presence of an object; a method has been created that is independent of the weather and allows a robust detection of objects along and in the immediate vicinity of a track.
- the method according to the invention is a static method insofar as dubious results a check of the track for the presence of objects can be repeated several times without an on-site inspection having to be carried out.
- the detectors can be positioned along the track in a freely selectable sequence; the procedure can optimally be based on the putative
- step C the response signals transformed into the frequency space can be assigned to the detectors; an object detected by a detector can be located precisely and an intervention detachment can be directed precisely to the relevant point on the railway line (claim 7).
- FIG. 1 a shows the section of the route provided with detectors
- FIG. 1b Assignment of signals after transformation into the frequency domain
- FIG. 2 construction of a detector
- Figure 3 representation of the transmitted pulse packet, signal curve for the gradient coil and response signal.
- Figure la shows a section of the route in the overview.
- Parallel to a track 1 are 2 metal detectors D ⁇ at a distance a from the track axis ; D 2 , .., are arranged in freely selectable spaces, .., d 34 , d 45 , .. (not fully shown and enumerated in Fig. La). These gaps result from the operational requirements of a railway administration; Typical orders of magnitude for these gaps are 5 m .. 200 m, for the distance a to the track axis 3 to 6 m.
- the metal - hereinafter briefly detectors D x, D 2, .. called, are connected to a transmitting / receiving unit 5, wherein a detector D n geometrically the last detector.
- the index n stands for the maximum number of detectors, typical values for n being in the order of 10 .. 100.
- FIG. 2 shows the structure of a detector D 1 operating according to the NMR (Nuclear Magnetic Resonance) method, which has a permanent magnet 10, a gradient coil 11 and a transmission / Receiving coil 14 contains.
- the permanent magnet 10 is horseshoe-shaped, a water sample 12 is arranged in the air gap, which is surrounded both by the gradient coil 11 and by the transmission / reception coil 14. It is to be provided constructively that the B field generated in the transmission / reception coil 14 is orthogonal to the B field of the permanent magnet 10.
- the water sample 12 consists of a glass body filled with distilled water, a typical internal volume (also called measurement volume) of the glass body is of the order of magnitude of 0.5 cm.
- the design of the measurement volume must be such that on the one hand the highest possible signal intensity is achieved - this is an advantage of a relatively large measurement volume - and on the other hand a high homogeneity of the permanent magnetic field must be ensured via the corresponding measurement volume.
- the H nuclei of the water molecules H 2 0 are particularly suitable for the NMR method.
- the so-called Larmor frequency of the H-core is 42MHz / Tesla.
- the signal intensity of the response signal S R is largely determined by the homogeneity of the magnetic field in the air gap. Relatively large metallic objects in the immediate vicinity of the permanent magnet influence the homogeneity of the magnetic field in the air gap, which leads to a line broadening and thus almost or completely to an extinction of the NMR signal.
- the structure and mode of operation of such a detector O 1 is referred to by a person skilled in the art as a so-called NMR detector.
- the individual detectors D 1 , D 2 , etc. are individually characterized by their own number of turns N 1 N 2 , .. of the gradient coil 11.
- the gradient coils 11 of the individual detectors D 1 , D 2 etc. are connected in parallel with one another and connected to a gradient amplifier (not shown in FIG. 1 a).
- the gradient amplifier can be part of the transmitting / receiving unit 5.
- the individual transmission / reception coils 14 are preferably connected in parallel to the transmission / reception unit 5; serial connection is also possible.
- a pulse packet S p (also called a transmission pulse) is shown in FIG. 3 below, which is transmitted from the transmitting / receiving unit 5 to the detectors D 1 # D 2 , etc.
- a square wave signal S A is applied to the gradient coils 11 by the gradient amplifier.
- Rectangular signal S A depending on the acquisition time or also the observation time called t A , is approximately 2 s. Together with the individual number of turns of the gradient coil 11, an additional field individual to the permanent magnetic field can be superimposed for each detector D x , D 2 . This additional field is matched to the local position of the detector D k in question. The adjustment can also be carried out in the evaluation unit with correction values.
- the individual number of turns N., N 2 of the gradient coil of the detectors D ⁇ , D 2 arranged along a track 1 also results in a detector-specific frequency band for the response signal S R for a transmitted pulse packet S p .
- the pulse width t p must be selected so that all hydrogen atoms in the various detectors O., D 2 , etc.
- the response signal S R of a detector D to a transmitted pulse packet S p is also shown in FIG. 3 in the time domain.
- the typical observation time (acquisition time) is 1 s, the amplitude in the range of mV.
- the response signal S R is mapped into the frequency domain by means of a Fourier transformation.
- the result of this mapping of the response signals S R can be seen from FIG. 1b with a curve S Rf shown in simplified form.
- a broken scale - but not shown as such - shows the number of turns N, N 2 , etc. different response signals P x , P 2 , etc. are shown.
- an implementation provides the inventive method, that after installation of the aforementioned system along a TRACK IS 1, p at emitted pulse packets S into the frequency domain transformed the detectors D 1, D 2 attributable response signals P 1 # P 2 in either the transmitting / receiving unit 5 or in an assigned evaluation unit.
- These stored response signals P ⁇ , P 2 , P 3 , etc. can be assigned the same or individual tolerance bands for all.
- the aforementioned square-wave signal for the acquisition and the pulse packet S p are transmitted in a fixed time frame or as required.
- the response signals S R thereby received are transformed into the frequency domain and compared with the stored response signals P- L , P 2 , P 3 , etc.
- An inequality or an inequality outside of the aforementioned tolerance band leads to the generation of a signal from which an occupancy of the track 1 or track section in question arises.
- the embodiment of the method according to the invention described above was primarily aimed at the detection of non-railroad objects 6.
- the proposed method can also be used for railway operations themselves and for tracking a train along a section of track.
- the system and method according to the invention is not limited to the embodiment described above; further evaluation methods are possible, in particular by means of a two-dimensional Fourier transformation in order to be able to eliminate time delay shifts.
- the method explained above is not limited to railway technology, but can also be used, for example, in a matrix arrangement of detectors at a distance of, for example, 0.5 m for the detection of metallic objects such as mines.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Geophysics And Detection Of Objects (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02774656A EP1453714B1 (de) | 2001-12-14 | 2002-09-27 | Verfahren und system zur detektion von objekten längs eines geleises |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01129777 | 2001-12-14 | ||
| EP01129777A EP1319570A1 (de) | 2001-12-14 | 2001-12-14 | Verfahren und System zur Detektion von Objekten längs eines Geleises |
| PCT/EP2002/010838 WO2003051700A1 (de) | 2001-12-14 | 2002-09-27 | Verfahren und system zur detektion von objekten längs eines geleises |
| EP02774656A EP1453714B1 (de) | 2001-12-14 | 2002-09-27 | Verfahren und system zur detektion von objekten längs eines geleises |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1453714A1 true EP1453714A1 (de) | 2004-09-08 |
| EP1453714B1 EP1453714B1 (de) | 2006-11-22 |
Family
ID=8179537
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01129777A Withdrawn EP1319570A1 (de) | 2001-12-14 | 2001-12-14 | Verfahren und System zur Detektion von Objekten längs eines Geleises |
| EP02774656A Expired - Lifetime EP1453714B1 (de) | 2001-12-14 | 2002-09-27 | Verfahren und system zur detektion von objekten längs eines geleises |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01129777A Withdrawn EP1319570A1 (de) | 2001-12-14 | 2001-12-14 | Verfahren und System zur Detektion von Objekten längs eines Geleises |
Country Status (5)
| Country | Link |
|---|---|
| EP (2) | EP1319570A1 (de) |
| AT (1) | ATE345964T1 (de) |
| DE (1) | DE50208808D1 (de) |
| ES (1) | ES2277621T3 (de) |
| WO (1) | WO2003051700A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102673610B (zh) * | 2012-05-29 | 2015-06-24 | 北京佳讯飞鸿电气股份有限公司 | 铁路防灾异物侵限监控系统 |
| CN104627205A (zh) * | 2014-12-17 | 2015-05-20 | 西南交通大学 | 基于光纤光栅传感器闭环回路的铁路异物侵限监测系统 |
| CN111079734B (zh) * | 2019-12-12 | 2020-07-31 | 哈尔滨市科佳通用机电股份有限公司 | 铁路货车三角孔异物检测方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4968979A (en) * | 1985-04-19 | 1990-11-06 | Omron Tateisi Electronics Co. | Vehicle detecting system |
| GB2286248B (en) * | 1991-06-07 | 1995-11-22 | British Tech Group | Detection method and apparatus |
| US5868360A (en) * | 1997-06-25 | 1999-02-09 | Primetech Electronics Inc. | Vehicle presence detection system |
-
2001
- 2001-12-14 EP EP01129777A patent/EP1319570A1/de not_active Withdrawn
-
2002
- 2002-09-27 ES ES02774656T patent/ES2277621T3/es not_active Expired - Lifetime
- 2002-09-27 AT AT02774656T patent/ATE345964T1/de active
- 2002-09-27 EP EP02774656A patent/EP1453714B1/de not_active Expired - Lifetime
- 2002-09-27 DE DE50208808T patent/DE50208808D1/de not_active Expired - Lifetime
- 2002-09-27 WO PCT/EP2002/010838 patent/WO2003051700A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03051700A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003051700A1 (de) | 2003-06-26 |
| EP1453714B1 (de) | 2006-11-22 |
| DE50208808D1 (de) | 2007-01-04 |
| ES2277621T3 (es) | 2007-07-16 |
| ATE345964T1 (de) | 2006-12-15 |
| EP1319570A1 (de) | 2003-06-18 |
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