CN101113886A - Device used for measuring distance between moving object and its railway - Google Patents
Device used for measuring distance between moving object and its railway Download PDFInfo
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- CN101113886A CN101113886A CNA2007100498411A CN200710049841A CN101113886A CN 101113886 A CN101113886 A CN 101113886A CN A2007100498411 A CNA2007100498411 A CN A2007100498411A CN 200710049841 A CN200710049841 A CN 200710049841A CN 101113886 A CN101113886 A CN 101113886A
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Abstract
The invention discloses a distance between a moving object and the track detecting device. A high frequency signal source, a transducer and a signal processing circuit of the detecting device are arranged in a moving object. Wherein, the transducer is constituted by an induction winding and the length of the induction winding along the track is equal to or is integer times as much as one longitudinal interval of the periodic variation of the track magnetic resistance or track resistance. The device is suitable for the distance detection between a maglev-vehicle and the track and can not be affected by the track magnetic resistance variation. The device has the advantages of high detection accuracy, all components of the device being arranged on the moving object, less quantity of components, low cost and easy maintenance.
Description
Technical Field
The present invention relates to a device for detecting a distance between a moving object and a track thereof, and more particularly, to a device for detecting a distance between a magnetic levitation vehicle and a track thereof.
Background
The following two methods are generally used to detect the distance between the moving object and the track: the first is that an electric signal transmitter with a certain shape is laid along the track, a receiver is arranged on a vehicle, and the electric signal received by the receiver is in inverse proportion to the distance to attenuate, so that the distance between the suspended moving object and the track can be detected; the second method is that the moving object receiver detects the distance from the phase shift (delay component) of the pulse signal or the M-sequence signal transmitted from the track transmitter.
The disadvantages of both methods are: because the signal transmitter is installed on the ground, the cost is high when the track is long; and the signal emitter is active, and is inconvenient to maintain when a fault occurs. In addition, when the detection device designed by the two methods is applied to the situation that the track magnetic resistance or the resistance has periodic variation, the periodic variation of the measurement signal can be caused, and the accuracy of distance detection is influenced. For example, the magnetic resistance of a magnetic levitation track used in rail transit changes periodically, so that neither method is suitable for detecting the distance between a magnetic levitation vehicle and the track.
Disclosure of Invention
The invention aims to provide a device for detecting the distance between a moving object and a track thereof, which is suitable for detecting the distance between the moving object and the track with periodic variation of the magnetic resistance or the resistance thereof, is not influenced by the periodic variation of the magnetic resistance or the resistance of the track during detection, and has high detection precision; and the device that it needs to install is few, and is with low costs, the easy maintenance.
The technical scheme adopted by the invention is as follows: a device for detecting the distance between a moving object and the orbit thereof comprises a signal entering sensor of a high-frequency signal source, and a signal processing circuit for processing the signal sensed by the sensor, and is characterized in that: the high-frequency signal source, the sensor and the signal processing circuit are all arranged on the moving object, wherein the sensor detection head consists of an induction winding.
The induction winding (A) is composed of 2 or more than 2 induction coils which are longitudinally arranged in an even number, have the same size and have the same number of turns and are wound by a lead, and the winding directions of the adjacent induction coils are opposite; the length of the sensing winding along the longitudinal direction of the track is equal to an integral multiple of the longitudinal spacing of one period of the track reluctance or resistance period change;
or the induction windings are 2 groups or more than 2 groups, the adjacent induction windings are sequentially staggered in the longitudinal direction of the track, and the staggered distance of the adjacent windings is equal to the integral multiple of the longitudinal distance of one period of track magnetic resistance or resistance period change divided by the number of the windings.
The working process and principle of the invention are as follows:
during measurement, a high-frequency signal generated by the signal generator is sent to an induction coil of an induction winding of the sensor, the high-frequency signal with the same frequency exists in the induction coil, and a signal processor receives a high-frequency voltage signal generated on the induction coil. The amplitude of the high-frequency voltage signal is in direct proportion to the inductance of the coil, and the inductance of the induction coil is in inverse proportion to the vertical distance (gap) between the tracks below the induction coil, so that the signal processing circuit can measure the gap between the moving object and the tracks through the amplitude of the received high-frequency voltage signal. And the influence of the track magnetic resistance or the periodic change of the resistance on the measurement result is eliminated by 2 or more than 2 induction coils or 2 or more than 2 windings in specific distribution.
Compared with the prior art, the invention has the beneficial effects that:
1. because the amplitude output of the high-frequency voltage in the coil is changed along with the period change of the magnetic resistance or resistance in the track, the amplitude output of the high-frequency voltage in the coil is changed along with the sine period of the same period. In the invention, 2 or more than 2 induction coils are specifically distributed in one winding, so that the phase difference of the amplitude change of the high-frequency induction voltage in each induction coil is equal to one or more phases of 360 degrees. Such as: the number of the induction coils is 6, the length of the induction coils is equal to 2 times of the longitudinal distance (D) of one period of the track reluctance or resistance periodic variation, and the phase difference between the adjacent coils is 120 degrees. After the voltage signals of the coils are added, sinusoidal variable quantities of the coils are mutually offset due to the change of the magnetic resistance or the resistance period, and the sinusoidal variable quantities are zero; the amplitude of the voltage signal output to the signal processing circuit is the amplitude of the signal related only to the track gap. The invention can also adopt 2 or more than 2 windings (namely, a single coil or a plurality of coils form the windings) with specific distribution, and when the output signals of the voltage amplitude of each winding are added in the signal processing circuit, the sinusoidal variation of each winding caused by the reluctance or resistance period variation is also cancelled. Therefore, the detection device of the invention is suitable for detecting the distance between the moving object and the track with periodically changed magnetic resistance or resistance, is not influenced by the periodically changed magnetic resistance or resistance of the track during detection, and has high detection precision.
2. Because the high-frequency signal source, the sensor and the signal processing circuit are all arranged on the moving object and move along with the moving object, and no device is arranged on the track, compared with the existing method for arranging the device along the track, the method has the advantages that the number of devices required to be arranged is greatly reduced, the cost is low, and the maintenance is extremely convenient.
3. The device of the invention utilizes electromagnetic signals, so the requirement on the working environment is lower, and the work of the device is not influenced by rain, snow, dust and the like.
In the induction winding composed of 2 or more than 2 identical induction coils, the winding directions of adjacent induction coils are opposite. Therefore, the mutual inductance between the coils is maximized, the amplitude of the output voltage on the whole induction winding is maximized, and the detection sensitivity of the device is improved; meanwhile, the external interference magnetic field can generate induced current with the same spatial direction in adjacent coils of the winding, and the winding directions of the adjacent coils are opposite, so that the influence of the adjacent coils on the final output current of the winding is mutually counteracted. Thereby further improving the detection accuracy and precision of the invention.
The invention is described in further detail below with reference to the following figures and detailed description.
Drawings
Fig. 1 is a schematic circuit diagram of a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a spatial position relationship between a sensing winding and a track according to a first embodiment of the present invention. The induction windings are overlapped in the vertical direction, namely are positioned on the same horizontal plane; however, for the convenience of observation, each induction winding is translated up and down.
Fig. 3 is a schematic diagram illustrating the winding directions of the induction coils in the induction winding and the mutual connection relationship thereof according to the first embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating the winding directions of the induction coils in the induction winding and another mutual connection relationship thereof according to the first embodiment of the present invention.
In fig. 3 and 4: the right side portion of the left induction coil is actually overlapped with the left side portion of the adjacent right induction coil, but for the convenience of observation, the overlapped portion is shifted left and right to be mutually staggered.
Detailed Description
Example one
Fig. 1 to 4 show that one embodiment of the present invention is: a device for detecting the distance between a moving object and its orbit comprises a high-frequency signal source, a signal input sensor, and a signal processing circuit for processing the signal sensed by the sensor. The high-frequency signal source S, the sensor and the signal processing circuit PS are all arranged on a moving object, wherein the sensor consists of an induction winding:
each group of induction windings A consists of 4 induction coils L which are longitudinally arranged and have the same size and are wound by a lead, the winding directions of the adjacent induction coils are opposite, and the four induction coils are respectively marked as L 1 、L 2 、L 3 、 L 4 . The length of the sensing winding in the longitudinal direction is equal to 2 times the longitudinal spacing D of one period of the track reluctance or resistance period change.
The induction windings A of the present example are 3 groups marked as A 1 、A 2 、A 3 With adjacent induction windings A in orbitThe adjacent windings A are staggered in the longitudinal position in sequence, and the staggered distance D of the adjacent windings A is equal to 1 time of the longitudinal distance D of one period of the periodic variation of the track magnetic resistance divided by 3 (namely the number of windings).
The 3 windings a are themselves coincident in vertical position, i.e. in the same horizontal plane. In fig. 2, 3 windings are vertically translated and staggered for convenient viewing.
Fig. 3 and 4 show two connection relationships of four coils L of the induction winding a, but each of the 4 induction coils L is wound by one wire and arranged in the longitudinal direction, and the winding directions of adjacent induction coils L are opposite.
Winding A i (i =1 to 3) amplitude e of the output voltage signal Ai For the amplitude e of the voltage on the respective coil ji The sum, expressed in terms of an equivalent mathematical expression, is as follows:
e ji is A i J-th coil L of winding j And (3) outputting the voltage.
The longitudinal length of the induction winding is the same as 2 times of the longitudinal distance (D) of one period of track magnetic resistance or resistance period change, and when the phase difference of adjacent coils of the same induction winding is pi, the voltage amplitude of each coil in the induction winding is as follows:
wherein x is the position of the coil, D is the width of two adjacent high (low) magnetic resistance or resistance regions, and M ji Is A i J-th coil L of winding j Amplitude of signal variation due to reluctance or resistance variation, E ji Is the induction alternating current signal amplitude corresponding to a certain measuring distance of the coil under normal conditions.
Since each coil L is constructed identically and is placed in the same manner, the parameters of each coil are considered identical, i.e., M, regardless of errors and disturbances ji And E ji The same applies to (j =1 to 4,), and M and E are used.
Thus, substituting equation (2) into equation (1) will eliminate the position-dependent part of the amplitude variation, leaving the position-independent part, i.e., winding A i The output voltage amplitude of (d) is:
e Ai ＝e 1i +e 2i +e 3i +e 4i ＝4E (i＝1～3) (3)
it is clear that the more coils in the winding, the less errors and disturbances the value of the total output voltage e is subjected to, the more accurate the detected distance value.
When the high-frequency signal source provides high-frequency signals with the same frequency and the same size for all the windings, the voltage amplitude outputs of the three windings A are superposed in the signal processing circuit, and the total voltage amplitude e obtained is three windings A 1 、A 2 、A 3 The sum of the voltage amplitudes at, i.e.:
e＝e A1 +e A2 +e A3 ＝12E (4)
it can be seen from the equation (4) that the output e of the multi-coil multi-winding structure is only related to the distance between the moving object and the track, and is not related to the position of the detection device, i.e. the periodic variation of the track reluctance or resistance, so that the influence of the reluctance or resistance variation on the output voltage of the induction coil can be eliminated. Meanwhile, the superposition of the three windings A can avoid and reduce the influence of random errors and interference generated by a single winding on a measurement result: such as errors due to coil edge effects in the windings and non-uniform distance between the windings and the track. And, many windings A have the redundancy, once some windings or information channel break down, the whole device still can continue to use, just detect the accuracy and reduce.
Example two
This example is substantially the same as the first example, except that: the sense windings a are reduced to one set.
EXAMPLE III
This example is substantially the same as the first example, except that: the induction windings A are divided into two groups, and one induction coil C is arranged in each group. The staggered distance of the two groups of windings along the longitudinal direction of the track is half of the length period of the track magnetic resistance or resistance. At any time during detection, the high-frequency voltage amplitude values generated by the track magnetic resistance or the resistance period change on the two windings have the same magnitude and opposite directions.
The invention can be used for detecting the distance between various objects with periodically changed magnetic resistance or resistance and moving objects on the upper part of the objects, such as the gap between a magnetic suspension vehicle and a magnetic suspension track, so as to be beneficial to ensuring the stable suspension and the high-speed and safe operation of the magnetic suspension vehicle.
Claims (2)
1. An apparatus for detecting the distance between a moving object and its orbit, comprising a signal from a high-frequency signal source entering a sensor, the signal sensed by the sensor being processed by a signal processing circuit, characterized in that: the high-frequency signal source (S), the sensor and the signal processing circuit (PS) are all arranged on the moving object, wherein the sensor consists of an induction winding (A):
the induction winding (A) is composed of 2 or more than 2 induction coils (L) which are longitudinally arranged in an even number, have the same size and have the same number of turns and are wound by a lead, and the winding directions of the adjacent induction coils are opposite; the length of the induction winding (A) along the longitudinal direction of the track is equal to integral multiple of the longitudinal distance (D) of one period of track magnetic resistance or resistance period change;
or the induction windings (A) are 2 groups or more than 2 groups, the adjacent induction windings (A) are sequentially staggered in the longitudinal direction of the track, and the staggered distance (D) of the adjacent windings (A) is equal to the integral multiple of the longitudinal pitch (D) of one period of track magnetic resistance or resistance period change divided by the number of windings.
2. The apparatus of claim 1, wherein the distance between the mobile object and the orbit is determined by: in the induction winding (A) formed by the 2 or more than 2 same induction coils (L), the winding directions of the adjacent induction coils (L) are opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100498411A CN100494877C (en) | 2007-08-24 | 2007-08-24 | Device for measuring distance between moving object and its railway |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100498411A CN100494877C (en) | 2007-08-24 | 2007-08-24 | Device for measuring distance between moving object and its railway |
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| Publication Number | Publication Date |
|---|---|
| CN101113886A true CN101113886A (en) | 2008-01-30 |
| CN100494877C CN100494877C (en) | 2009-06-03 |
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| CNB2007100498411A Expired - Fee Related CN100494877C (en) | 2007-08-24 | 2007-08-24 | Device for measuring distance between moving object and its railway |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270344A (en) * | 2010-06-04 | 2011-12-07 | 东芝阿尔派·汽车技术有限公司 | Moving object detection apparatus and moving object detection method |
| CN105333810A (en) * | 2015-11-03 | 2016-02-17 | 西南交通大学 | Low-speed magnetic suspension train gap sensor in three-probe time sharing detection |
| CN109029228A (en) * | 2018-05-30 | 2018-12-18 | 中南大学 | It is a kind of for measuring the system and method for rail vehicle offset opposite with rail |
| CN109323646A (en) * | 2018-11-13 | 2019-02-12 | 阿斯科纳科技（深圳）有限公司 | A kind of position sensor system applied to linear motor vector controlled |
| CN111207663A (en) * | 2020-01-17 | 2020-05-29 | 中车株洲电力机车有限公司 | Gap measuring unit, suspension sensor, speed measuring method and suspension gap measuring method |
| CN113815680A (en) * | 2021-09-16 | 2021-12-21 | 宁夏大学 | Railway track sand burying detection system and early warning method |
-
2007
- 2007-08-24 CN CNB2007100498411A patent/CN100494877C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270344A (en) * | 2010-06-04 | 2011-12-07 | 东芝阿尔派·汽车技术有限公司 | Moving object detection apparatus and moving object detection method |
| CN105333810A (en) * | 2015-11-03 | 2016-02-17 | 西南交通大学 | Low-speed magnetic suspension train gap sensor in three-probe time sharing detection |
| CN105333810B (en) * | 2015-11-03 | 2018-01-05 | 西南交通大学 | The probe timesharing detection medium-and low-speed maglev train gap sensor of one kind three |
| CN109029228A (en) * | 2018-05-30 | 2018-12-18 | 中南大学 | It is a kind of for measuring the system and method for rail vehicle offset opposite with rail |
| CN109029228B (en) * | 2018-05-30 | 2021-01-05 | 中南大学 | System and method for measuring relative offset between rail vehicle and steel rail |
| CN109323646A (en) * | 2018-11-13 | 2019-02-12 | 阿斯科纳科技（深圳）有限公司 | A kind of position sensor system applied to linear motor vector controlled |
| CN109323646B (en) * | 2018-11-13 | 2024-06-14 | 阿斯科纳科技（深圳）有限公司 | Position sensor system applied to linear motor vector control |
| CN111207663A (en) * | 2020-01-17 | 2020-05-29 | 中车株洲电力机车有限公司 | Gap measuring unit, suspension sensor, speed measuring method and suspension gap measuring method |
| CN111207663B (en) * | 2020-01-17 | 2021-11-16 | 中车株洲电力机车有限公司 | Gap measuring unit, suspension sensor, speed measuring method and suspension gap measuring method |
| CN113815680A (en) * | 2021-09-16 | 2021-12-21 | 宁夏大学 | Railway track sand burying detection system and early warning method |
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| Publication number | Publication date |
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| CN100494877C (en) | 2009-06-03 |
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Granted publication date: 20090603 Termination date: 20120824 |