EP2349810A1 - Wheel sensor - Google Patents
Wheel sensorInfo
- Publication number
- EP2349810A1 EP2349810A1 EP09736400A EP09736400A EP2349810A1 EP 2349810 A1 EP2349810 A1 EP 2349810A1 EP 09736400 A EP09736400 A EP 09736400A EP 09736400 A EP09736400 A EP 09736400A EP 2349810 A1 EP2349810 A1 EP 2349810A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- sensor
- wheel
- rail
- sensor coil
- 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
- 230000001939 inductive effect Effects 0.000 claims abstract description 8
- 230000003993 interaction Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 3
- 230000011664 signaling Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000035945 sensitivity Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000004804 winding Methods 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
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/162—Devices for counting axles; Devices for counting vehicles characterised by the error correction
-
- 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
- B61L1/16—Devices for counting axles; Devices for counting vehicles
- B61L1/163—Detection devices
- B61L1/165—Electrical
Definitions
- Corresponding wheel sensors have at least one sensor coil, which is arranged in an electrical oscillating circuit and fed with an alternating current.
- the iron mass of a passing wheel or a passing axle leads to a damping of the magnetic field of the sensor coil, so that a drive through a wheel on the basis of a change caused by the properties, such as the vibration amplitude or the quality of the electrical resonant circuit is detectable.
- inductively operating wheel sensors are relatively sensitive to inductively coupled noise voltages on the working frequency, as they can be caused for example by rail currents.
- the return current of a locomotive through the rail or the harmonic content of this return conductor current cause a disturbance signal in the form of a beat.
- such a beating is usually difficult to distinguish from a signal caused by wheeling.
- working on an inductive active principle wheel sensors can be disturbed in practice, for example, by arranged in their vicinity sensors with the same operating frequency;
- disturbances can also be caused or induced by pulse-like high commutation current edges of the rail current or by lines and transformers of passing trains.
- the present application relates to a wheel sensor, in particular for train detection systems, with at least one sensor device with an AC powered sensor coil sensitive to an inductive interaction of the sensor coil with rolling wheels of rail vehicles sensitive electrical resonant circuit and a further coil with the sensor coil for the suppression of external interference in a Counter circuit is connected.
- Such a wheel sensor is known from published German patent application DE 101 37 519 A1.
- the known wheel sensor on two coils having substantially the same geometry and the same number of turns, the coils overlap relative to a mounted on the rail wheel sensor in the rail longitudinal direction and are connected in a counter circuit.
- both coils are involved in wheel detection and, in the case of an interference field caused by a rail current, for example, essentially passes through equally strong alternating magnetic fields, which are thus compensated due to the counter-switching of the coils.
- the present invention has for its object to provide an alternative or further wheel sensor of the aforementioned type with particularly good interference suppression.
- a wheel sensor in particular for train detection systems, having at least one sensor device with an alternating current fed sensor coil of an inductive interaction of the sensor coil with passing wheels of rail vehicles.
- sensitive electrical resonant circuit and a further coil which is connected to the sensor coil for suppressing external interference fields in a counter circuit, wherein the further coil is arranged below the sensor coil and the distance between the further coil and the sensor coil is at least one third of the inner diameter of the sensor coil ,
- the further coil of the wheel sensor is thus arranged below the sensor coil, wherein the distance between the further coil and the sensor coil is at least one third of the inner diameter of the sensor coil.
- the indication "below” with respect to the arrangement of the further coil to the sensor coil refers to the alignment of a wheel sensor properly mounted in the rail area This means that the longitudinal axis of the sensor coil is usually substantially perpendicular to the longitudinal direction of the rail.
- the further coil is not laterally in the wheel sensor according to the invention It is of great importance for the functionality of such an arrangement that the distance between the further coil and the sensor coil is at least one-third of the distance between the other coil and the sensor coil s inside diameter of the sensor coil is, otherwise a sufficient sensitivity of the sensor coil is not guaranteed on surveillancerollende wheels. This results from the fact that with a shorter distance of the superimposed coils due to the mutual induction taking place a nearly complete ge compensation would be made in the event of damp
- the further coil is arranged below the sensor coil and at the same time the distance between the further coil and the sensor coil is at least one third of the inner diameter of the sensor coil, it is now advantageously ensured that the further coil is a compensation coil with respect to its function ie essentially only the compensation of interference fields, in particular of rail currents, is used.
- the further coil has a larger distance to a wheel or wheel flange of a wheel to be detected, and thus its magnetic field is not or only comparatively slightly influenced by the passing iron mass.
- the magnetic field of a rail current circulating the rail flows through both coils, i. the sensor coil and the other coil, in opposite directions and thus at least largely compensated.
- advantageously also disturbances from other sources are compensated by the arrangement of the coils in the wheel sensor. This concerns, for example, disturbances caused by current cables running in the vicinity of the sensor or possible interference effects of adjacent sensors.
- the wheel sensor according to the invention has the advantage that the superimposed arrangement of the coils leads to the fact that for each of the coils, ie both for the sensor coil and for the further coil, the housing length of the wheel sensor in the rail longitudinal direction can be fully utilized , This allows a particularly large Einwirks the professionrollenden wheel, whereby a particularly high sensitivity of the wheel sensor is achieved. This applies in particular also in the case of a lateral offset of the iron mass to be detected caused by differently worn wheel rims.
- the wheel sensor according to the invention is configured such that the further coil is arranged such that its longitudinal axis runs parallel to that of the sensor coil. Due to the fact that the winding planes of the sensor coil and the further coil are parallel or at least substantially parallel to one another in this case, a particularly good compensation of interference fields is achieved.
- the wheel sensor according to the invention is so pronounced that the further coil is arranged such that its longitudinal axis corresponds to that of the sensor coil.
- the longitudinal axes of the further coil and the sensor coil coincide, i. that the two coils are arranged centrally above one another. This is preferred since, in particular, for rail currents which generate a field symmetrical to the rail, the best possible compensation of the resulting magnetic interference field or of the resulting interference voltage induced by the magnetic interference field is made possible.
- the sensor coil has a core.
- the wheel sensor according to the invention is designed such that the sensor coil is an air-core coil.
- the further coil is also described with regard to the further coil.
- the further coil is an air-core coil.
- the sensor coil and the further coil can be coils of the same type.
- the further coil differs from the sensor coil with respect to its type, in particular its geometry and / or its number of turns. This is advantageous because the magnetic field generated by a rail current due to the
- Rail geometry usually has a height dependence.
- the other coil has the same shape or shape, ie. in particular their geometry, and / or their number of turns differs from the sensor coil, as this allows an optimal compensation of disturbances.
- the wheel sensor according to the invention can also be embodied such that at least two sensor devices spaced apart from one another are mounted in the rail longitudinal direction relative to a wheel sensor mounted in the rail region.
- This offers the advantage that by means of the at least two sensor devices, which each have a sensor coil and a further coil, a determination of the direction of travel of the passing wheel is made possible.
- the two sensor devices or sensor channels generate successively time-offset signals when they are passed through a wheel of a rail vehicle, which signals can be used in a subsequent evaluation unit for detecting the direction of travel of the rail vehicle.
- Figure 1 is a schematic sectional view of a first embodiment of an on the
- Figure 2 is a side perspective view of a mounted on a rail second embodiment of a wheel sensor according to the invention with two sensor devices.
- Figure 1 shows a schematic sectional view of a first embodiment of a mounted on the rail wheel sensor according to the invention. Shown is in a section perpendicular to the rail longitudinal direction, a wheel sensor 1, which has a sensor coil 2 and a further coil 3. The sensor coil 2 and the further coil are arranged in a housing 4 of the wheel sensor 1, the wheel sensor 1 or the housing 4 of the wheel sensor 1 being fastened by means of fastening means 5 to a rail 10.
- the sensor coil 2 is fed by an alternating current and is part of a sensitive to an inductive interaction of the sensor coil 2 with regardrollenden wheels resonant circuit.
- the sensor coil 2 is connected to suppress interference fields with the other coil 3 in a counter circuit.
- FIG. 1 omits not only the illustration of the aforementioned electrical components or connections, but moreover also a reproduction of further components of the wheel sensor 1 which are known per se. This applies, for example, to an optionally in the wheel Sensor 1 existing monitoring or evaluation circuit and cable guides from and to the wheel sensor. 1
- the wheel sensor 1 is shown in its position on the rail when crossing a wheel 20 having a flange 21. As shown in FIG. 1, the sensor coil 2 of the wheel sensor 1 is positioned on the rail 10 in such a way that the field of the sensor coil 2 is damped or damped by the wheel flange 21 of the wheel 20.
- the further coil 3 is arranged below the sensor coil 2 in relation to a wheel sensor 1 mounted or mounted on the rail.
- the distance A between the sensor coil 2 and the further coil 3 is at least one third of the inner diameter D of the sensor coil 2. This ensures that the influence of the further coil 3 with respect to a wheel detection is sufficiently low, so that a otherwise due to the countercurrent of the sensor coil 2 and the further coil 3 caused reduction of the sensitivity or the operability of the wheel sensor 1 with respect to wheels to be detected 20 or flanges 21 of wheels 20 is avoided.
- the further coil 3 substantially does not contribute to the wheel detection, but at least mainly serves the compensation of interference fields, in particular the rail current compensation.
- both the sensor coil 2 and the further coil 3 are air-core coils, thereby avoiding problems that arise in may occur due to saturation effects in coils with iron cores.
- the sensor coil 2 and the further coil 3 are arranged with respect to their type, i. in particular their geometry and / or their number of turns, from each other. This can advantageously be used to achieve an optimum interference field compensation as a function of the respective rail profile.
- the background here is that, for example, the magnetic field caused by a rail current is generally not height-dependent due to the rail geometry, so that the voltage induced in the sensor coil 2 when using similar coils will usually deviate from the voltage induced in the further coil 3.
- Figure 2 shows a perspective side view of a mounted on a rail second embodiment of a wheel sensor according to the invention with two sensor devices.
- the illustrated wheel sensor 1 has two sensor coils 2 and 6 and two further coils 3 and 7, which are housed in the housing 4 of the wheel sensor 1.
- the coils 2 and 3 as well as the coils 6 and 7 are part of a sensor device, ie the illustrated wheel sensor 1 has two sensor devices.
- the sensor coil 2 or 6 of the respective sensor device with the respective further coil 3 or 7 of the respective Sensor device connected in a counter circuit, so that interference fields are compensated.
- the wheel sensor 1 has two sensor devices, due to a temporal correlation of the signals detected by the sensor devices, it becomes possible to determine the direction of travel of a passing wheel or of a rail vehicle rolling past it. Due to this, the wheel sensor shown is particularly suitable for use in the context of train detection systems.
- the wheel sensor 1 is advantageous to the extent that externally induced disturbances are largely suppressed because they affect both the sensor coil 2 and 6 and the further coil 3 and 7 substantially equally.
- These include in particular rail currents, since the symmetry of the coupling is particularly high here.
- disturbances of other sources can be compensated advantageously.
- the superimposed arrangement of the coils of a sensor device advantageously makes it possible, in an embodiment with only one sensor device, for each of the coils, i. For example, both for the sensor coil 2 and for the further coil 3, the length of the housing 4 in the rail longitudinal direction can be fully utilized.
- the wheel sensor according to the invention advantageously also allows a particularly compact design, i. a particularly small housing length in the rail longitudinal direction to realize. This is particularly advantageous in situations where space is limited on the track.
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008056481A DE102008056481A1 (en) | 2008-11-05 | 2008-11-05 | wheel sensor |
PCT/EP2009/062913 WO2010052081A1 (en) | 2008-11-05 | 2009-10-05 | Wheel sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2349810A1 true EP2349810A1 (en) | 2011-08-03 |
EP2349810B1 EP2349810B1 (en) | 2014-08-13 |
Family
ID=41396051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09736400.4A Active EP2349810B1 (en) | 2008-11-05 | 2009-10-05 | Wheel sensor |
Country Status (5)
Country | Link |
---|---|
US (1) | US8590845B2 (en) |
EP (1) | EP2349810B1 (en) |
CN (1) | CN102202953B (en) |
DE (1) | DE102008056481A1 (en) |
WO (1) | WO2010052081A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009053257B4 (en) * | 2009-11-05 | 2013-10-02 | Siemens Aktiengesellschaft | wheel sensor |
DE102009053801B4 (en) * | 2009-11-18 | 2019-03-21 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Method and device for condition monitoring at least one wheelset bogie of a rail vehicle |
CN103448752B (en) * | 2013-09-18 | 2015-10-28 | 周口市凯旺电子科技有限公司 | A kind of wheel sensor |
CN107016171B (en) * | 2017-03-14 | 2020-08-18 | 哈尔滨工业大学 | Optimization method for spatial configuration of induction coil of unilateral axle counting sensor |
DE102018111454A1 (en) * | 2018-05-14 | 2019-11-14 | PINTSCH TIEFENBACH GmbH | Sensor for detecting metal parts, and method for attenuating a magnetic field |
DE102018111448A1 (en) * | 2018-05-14 | 2019-11-14 | PINTSCH TIEFENBACH GmbH | Sensor for detecting metal parts, and method for attenuating a magnetic field |
ES2862195T3 (en) * | 2018-09-06 | 2021-10-07 | Frauscher Sensortechnik GmbH | Sensor layout |
DE102019125883A1 (en) * | 2019-09-26 | 2021-04-01 | Schaeffler Technologies AG & Co. KG | Linear actuator with measuring device for determining a position of a linearly movable component |
DE102021212809A1 (en) | 2021-11-15 | 2023-05-17 | Siemens Mobility GmbH | Sensor device and method for detecting a change in magnetic field |
CN114670893B (en) * | 2022-04-26 | 2024-04-30 | 南京拓控信息科技股份有限公司 | Detection method for wheel falling block |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4365196A (en) * | 1977-12-14 | 1982-12-21 | Finch Colin M | Proximity sensing transducer with simulation means |
AU9059198A (en) * | 1997-09-04 | 1999-03-22 | L.B. Foster Company | Railway wheel counter and block control systems |
AT406139B (en) | 1998-04-08 | 2000-02-25 | Frauscher Josef | WHEEL SENSOR |
DE10137519A1 (en) | 2001-07-30 | 2003-02-13 | Siemens Ag | Wheel sensor for a unit signaling a clear railway line has an inductive sensor on a railway line to detect a change in a magnetic field as the iron wheels of a railway vehicle pass over a rail |
DE10221577B3 (en) | 2002-05-08 | 2004-03-18 | Siemens Ag | Magnetic wheel sensor |
CN2661525Y (en) * | 2003-11-20 | 2004-12-08 | 徐大年 | Anti interference wheel detector |
CN201028974Y (en) * | 2007-02-06 | 2008-02-27 | 河南辉煌科技股份有限公司 | Wheel sensor |
-
2008
- 2008-11-05 DE DE102008056481A patent/DE102008056481A1/en not_active Withdrawn
-
2009
- 2009-10-05 EP EP09736400.4A patent/EP2349810B1/en active Active
- 2009-10-05 US US13/127,844 patent/US8590845B2/en active Active
- 2009-10-05 CN CN200980144035.XA patent/CN102202953B/en active Active
- 2009-10-05 WO PCT/EP2009/062913 patent/WO2010052081A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010052081A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102202953A (en) | 2011-09-28 |
CN102202953B (en) | 2015-06-17 |
US8590845B2 (en) | 2013-11-26 |
EP2349810B1 (en) | 2014-08-13 |
US20110210213A1 (en) | 2011-09-01 |
WO2010052081A1 (en) | 2010-05-14 |
DE102008056481A1 (en) | 2010-05-06 |
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