CN217496143U

CN217496143U - Transponder

Info

Publication number: CN217496143U
Application number: CN202221042804.4U
Authority: CN
Inventors: 黄权航
Original assignee: Siemens Mobility Technologies Beijing Co Ltd
Current assignee: Siemens Mobility Technologies Beijing Co Ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-09-27
Anticipated expiration: 2032-04-29

Abstract

The utility model relates to a track traffic technical field, especially a transponder. The transponder comprises a magnetic field induction circuit (1), a mobile sensing circuit (2), a detection circuit (3) and a message sending module (4). The detection circuit (3) can output a direction indicating signal for indicating the train running direction according to the first voltage signal output by the magnetic field induction circuit (1) and the second voltage signal output by the mobile sensing circuit (2), and the message sending module (4) can respond to the direction indicating signal and send message information carrying information indicating the train running direction in a wireless mode. Therefore, when the train (T) passes through the transponder, the running direction of the train (T) can be confirmed by receiving the message information.

Description

Transponder

Technical Field

The utility model relates to a track traffic technical field, especially a transponder.

Background

The transponder is a point-type transmission system for high-speed data transmission between vehicles and ground based on the electromagnetic coupling principle, and is used for transmitting information to the vehicles from the ground at a specific place. The transponder is arranged on a sleeper in a track, when a train passes by, the transponder is instantaneously activated by electromagnetic energy sent by a vehicle-mounted antenna on the train, the received electromagnetic energy is converted into electric energy, message information containing various key information such as kilometers, speed limit, gradient and the like is called out by using the electric energy, and the message information is circularly sent to the vehicle-mounted antenna.

The train can determine the position according to the message information, but the train generally needs to pass through two transponders in a non-positioning state, and the train running direction (uplink or downlink) is determined according to the sequence of the received messages of the two transponders and the positions of the two transponders represented in the vehicle-mounted database.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a transponder to can confirm its direction of travel when making the train pass through a transponder, improve the efficiency of train location. Wherein the transponder can be either a passive transponder or an active transponder.

The utility model provides an in the embodiment of a pair of transponder, this transponder is suitable for to set up on the track and respond to the electromagnetic wave that the on-vehicle antenna on the train that traveles on the track through sent and work, the transponder includes magnetic field induction circuit, removal sensing circuit, detection circuitry and message sending module. The magnetic field induction circuit comprises a Hall element powered by a power supply module, wherein the Hall element can respond to the magnetic field of the vehicle-mounted antenna to generate a first voltage signal; the movement sensing circuit comprises a conductor connected into a conductive loop, and a second voltage signal is formed at two ends of the conductor in a magnetic field environment generated by the vehicle-mounted antenna in the running and passing process of the train; a detection circuit signal coupled to said magnetic field sensing circuit and said movement sensing circuit and responsive to said first voltage signal and said second voltage signal for outputting a direction indication signal indicative of a direction of travel of said train; the message sending module is in signal connection with the detection circuit and can send message information carrying information indicating the running direction of the train in a wireless mode in response to the direction indicating signal.

As can be seen from the above embodiments, when a train travels over a track and the transponder is in a magnetic field environment emitted by a vehicle antenna of the train, a first voltage signal of the magnetic field induction circuit and a second voltage signal of the movement sensing circuit are in the same phase when the train travels in a first direction, and the first voltage signal of the magnetic field induction circuit and the second voltage signal of the movement sensing circuit are in opposite phases when the train travels in a second direction opposite to the first direction. Accordingly, the detection circuit can output a direction indicating signal for indicating the running direction of the train, and the message sending module can respond to the direction indicating signal and send the message information carrying the information indicating the running direction of the train in a wireless mode. Therefore, when the train passes through the transponder, the running direction of the train can be confirmed by receiving the message information.

In a preferred implementation of the transponder according to the above embodiment, two input terminals of the detection circuit may be respectively connected to the magnetic field induction circuit and the motion sensing circuit, and output a first direction indication signal indicating a first train running direction when the first voltage signal and the second voltage signal are in phase, and output a second direction indication signal indicating a second train running direction when the first voltage signal and the second voltage signal are in opposite phase, and the first train running direction and the second train running direction are opposite.

For example, due to factors such as the detection accuracy of the first voltage signal and the second voltage signal, the in-phase and the out-of-phase mentioned in the present embodiment may allow a certain phase error, as long as the first voltage signal and the second voltage signal are considered to be in-phase or out-of-phase within a set phase error range. In addition, when the first voltage signal or the second voltage signal is not detected, the detection circuit outputs an abnormal signal, and the message sending module can send a message carrying information indicating that the running direction of the train cannot be determined in response to the abnormal signal. For example, the phase detector may be used to determine whether the phases of the first voltage signal and the second voltage signal are the same. The phase detector is a device capable of identifying the phase difference of input signals, and is a circuit which enables an output voltage to have a definite relationship with the phase difference between two input signals.

In a further preferred embodiment of the transponder, the detection circuit comprises a first comparator, a second comparator and a third comparator; the input end of the first comparator inputs two first voltage signals of a first time and a second time, the output end of the first comparator outputs a first comparison signal when the first voltage signal of the first time is greater than the first voltage signal of the second time, and the output end of the first comparator outputs a second comparison signal when the first voltage signal of the first time is less than the first voltage signal of the second time; the input end of the second comparator inputs two second voltage signals of the first time and the second time, the output end of the second comparator outputs a first comparison signal when the second voltage signal of the first time is greater than the second voltage signal of the second time, and the output end of the second comparator outputs a second comparison signal when the second voltage signal of the first time is less than the second voltage signal of the second time; the input end of the third comparator is connected with the first comparator and the second comparator, the output end of the third comparator outputs a first direction indicating signal indicating the running direction of the first train when the signals output by the first comparator and the second comparator are the same, and the output end of the third comparator outputs a second direction indicating signal indicating the running direction of the second train when the signals output by the first comparator and the second comparator are different.

Illustratively, the first comparator outputs the first comparison signal as "0" when the first voltage signal at the first time is greater than the first voltage signal at the second time; when the first voltage signal at the first time is smaller than the first voltage signal at the second time, the first comparator outputs a second comparison signal of '1'; when the first voltage signals of the first time and the second time are equal in a certain error range, the first comparator outputs an invalid signal; in addition, when the second voltage signal at the first time is greater than the second voltage signal at the second time, the second comparator outputs the first comparison signal as "0"; when the second voltage signal at the first time is smaller than the second voltage signal at the second time, the second comparator outputs a second comparison signal of '1'; the second comparator outputs an invalid signal when the second voltage signals at the first time and the second time are equal within a certain error range. If the outputs of the first comparator and the second comparator are both '0' or both '1', the third comparator can output a first direction indicating signal; if one of the outputs of the first comparator and the second comparator is "0" and the other is "1", the third comparator may output a second direction indicating signal. And when any one of the first comparator and the second comparator outputs an invalid signal, the third comparator does not need to compare the signals output by the first comparator and the second comparator, and the third comparator can output no signal at the moment.

Preferably, the third comparator may also compare a plurality of sets of the first comparison signal and the second comparison signal, and output the first direction indication signal or the second direction indication signal when the comparison results are consistent; and outputting an abnormal signal when the comparison result is inconsistent, wherein the message sending module can send a message carrying information indicating that the running direction of the train cannot be determined in response to the abnormal signal. Therefore, the reliability of judging the moving direction of the train can be further ensured.

In another preferred implementation of the transponder provided in the above embodiment, the detection circuit includes an adder, a first averaging circuit, a second averaging circuit, a third averaging circuit, and a comparison circuit. The input end of the first average value circuit is connected to the magnetic field induction circuit, and the output end of the first average value circuit outputs a first direct-current voltage signal obtained by filtering, rectifying and integrating the first voltage signal within a set time length; the input end of the second average circuit is connected to the mobile sensing circuit, and the output end of the second average circuit outputs a second direct-current voltage signal obtained by filtering, rectifying and integrating the second voltage signal within a set time length. Two input ends of the adder are respectively connected to the magnetic field induction circuit and the movement sensing circuit, and an output end of the adder outputs a superposed signal obtained by superposing the first voltage signal and the second voltage signal; the input end of the third mean value circuit is connected to the adder, and the output end of the third mean value circuit outputs a third direct-current voltage signal obtained by filtering, rectifying and integrating the superposed signal within a set time length. The input end of the comparison circuit is connected to the first average circuit, the second average circuit and the third average circuit, and outputs a first direction indicating signal which indicates a first train running direction when the third direct current voltage signal is greater than the first direct current voltage signal and simultaneously greater than the second direct current voltage signal; outputting a second direction indication signal indicating a second train traveling direction opposite to the first train traveling direction when the third direct current voltage signal is less than at least one of the first direct current voltage signal and the second direct current voltage signal.

Illustratively, when the phases of the first voltage signal and the second voltage signal are the same, the third dc voltage signal output by the adder is greater than both the first dc voltage signal and the second dc voltage signal; and when the phases of the first voltage signal and the second voltage signal are opposite, the third direct current voltage signal output by the adder is smaller than the larger one of the first direct current voltage signal and the second direct current voltage signal, and therefore the running direction of the train can be judged. In addition, when the comparison circuit receives only one of the first direct-current voltage signal and the second direct-current voltage signal but not the other one, the third comparison circuit may also output an abnormal signal, and the message sending module may send a message carrying information indicating that the driving direction of the train cannot be determined in response to the abnormal signal.

In a preferred implementation manner of the transponder provided in the foregoing embodiment, the message sending module further includes an information storage module and an information retrieving module; the information storage module stores first message information indicating forward running of the train and second message information indicating reverse running of the train; an information retrieval module is capable of retrieving the first message information in response to the first direction indication signal and retrieving the second message information in response to the second direction indication signal. For another example, the information storage module may further store message information indicating that the driving direction of the train cannot be determined, and the information retrieval module may further be configured to retrieve, in response to the detection circuit outputting the abnormal signal, a message information carrying the message information indicating that the driving direction of the train cannot be determined. In one embodiment, the last character of the train version number field may be used to indicate the driving direction of the train, for example, the last character "1" in the version number 1.1.1 indicates that the train is driving in the forward direction, the last character "2" in the version number 1.1.2 indicates that the train is driving in the reverse direction, and the last character "3" in the version number 1.1.3 indicates that the driving direction of the train cannot be determined. In addition, in addition to indicating the train traveling direction by characters in the version number, the train traveling direction may also be indicated by a reserved field in the message information.

Illustratively, in the running process of a train, when a vehicle-mounted antenna of the train is close to a transponder, a power supply module of the transponder receives electric energy provided by the vehicle-mounted antenna in an electromagnetic coupling mode to work, and a message sending module continuously sends message information to the outside; and when the vehicle-mounted antenna on the train is far away from the transponder, the transponder loses electric energy and stops sending message information.

In a preferred implementation manner of the transponder provided in the above embodiment, the transponder further includes a fixing base, and the hall element and the conductive body are disposed on the fixing base; and the fixed seat can be arranged in the middle of the track, the magnetic receiving surface of the Hall element is parallel to the plane of the track, and the central line between the two ends of the conductor is parallel to the plane of the track and perpendicular to the extending direction of the track (namely perpendicular to the running direction of the train). So, satisfying under this installation condition's the condition, hall element can produce stronger first voltage signal to and the electric conductor can produce stronger second voltage signal, thereby more do benefit to the detection of train moving direction.

In a preferred implementation of the transponder provided in the above embodiment, the power supply module comprises an electromagnetic energy receiving coil and a rectifier; the electromagnetic energy receiving coil can be electromagnetically coupled with electromagnetic waves generated by the vehicle-mounted antenna to generate electric energy; the rectifier can convert the electric energy generated by the electromagnetic energy receiving coil into direct current and then supply power to the Hall element. Illustratively, when the vehicle-mounted antenna of the train is close to the transponder during the operation of the train, the electromagnetic energy receiving coil of the transponder induces a magnetic field of 27MHz emitted by the vehicle-mounted antenna, and the power supply module can generate electric energy through electromagnetic coupling so as to provide necessary power supply for the operation of the transponder. In this way, the transponder can supply the hall element with electric power generated by electromagnetic coupling with the vehicle-mounted antenna without providing a battery separately. Besides, the power supply module can simultaneously supply power to other circuit modules in the transponder besides supplying power to the Hall element.

In a preferred implementation of the transponder provided in the above embodiment, the magnetic field sensing circuit may further include a first amplifier for amplifying a first voltage signal generated by the hall element. In addition, the motion sensing circuit may further include a second amplifier for amplifying a second voltage signal generated by the conductive body. By arranging the first amplifier and the second amplifier, the strength of the first voltage signal and the strength of the second voltage signal can meet the requirement of the detection circuit on the input voltage more easily, and the detection circuit can output a direction indicating signal for indicating the running direction of the train more accurately and reliably.

Drawings

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

fig. 1 is a block diagram of a transponder according to an embodiment of the present invention;

fig. 2 is a schematic view of a scene in which the train runs leftward in an embodiment of the present invention;

fig. 3 is a schematic view of a train traveling to the right in one embodiment of the present invention;

FIG. 4 is a block diagram of the detection circuitry of the transponder in one embodiment;

fig. 5 is a block diagram of a detection circuit of a transponder in another embodiment.

Wherein the reference numbers are as follows:

1-magnetic field induction circuit 11-Hall element 12-first amplifier

2-motion sensing circuit 21-conductor 22-second amplifier

3-detection circuit 311-first comparator 312-second comparator

313-third comparator 321-adder 3221-first mean circuit

3222-second average circuit 3223-third average circuit 323-comparison circuit

4-message sending module 41-information storage module 42-information calling module

5-supply module 51-electromagnetic energy receiving coil 52-rectifier

6-fixed seat T-train

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.

The embodiment provides a transponder, so that the running direction of a train T can be determined when the train T passes through the transponder, and the train positioning efficiency is improved. Wherein the transponder can be either a passive transponder or an active transponder.

The transponder provided by the present embodiment is adapted to be disposed on a track and to operate in response to electromagnetic waves emitted by a vehicle-mounted antenna on a train T traveling over the track. As shown in fig. 1, the transponder comprises a magnetic field sensing circuit 1, a movement sensing circuit 2, a detection circuit 3 and a messaging module 4. The magnetic field induction circuit 1 comprises a Hall element 11 powered by the power supply module 5, and the Hall element 11 can respond to the magnetic field of the vehicle-mounted antenna to generate a first voltage signal; the movement sensing circuit 2 comprises a conductor 21 connected to the conductive loop, and a second voltage signal is formed at two ends of the conductor 21 in the magnetic field environment generated by the vehicle-mounted antenna in the running and passing process of the train T; the detection circuit 3 is connected with the magnetic field induction circuit 1 and the movement sensing circuit 2 by signals, and can respond to the first voltage signal and the second voltage signal to output a direction indicating signal for indicating the driving direction of the train T; the message sending module 4 is in signal connection with the detection circuit 3 and can send message information carrying information indicating the driving direction of the train T in a wireless manner in response to the direction indicating signal.

Exemplarily, in a scene in which the train T travels leftward as shown in fig. 2, at a certain time, "×" indicates that the magnetic field direction emitted from the on-board antenna of the train T at that time is vertical to the inside of the paper surface, and "v" and "←" are combined to indicate that the travel direction of the train T at that time is leftward. At this time, according to the hall effect, the left side of the hall element 11 is connected to the positive power supply "+" and the right side is connected to the negative power supply "-", the current direction of the hall element 11 is from left to right, and the magnetic field at this time is perpendicular to the paper surface and faces inward, so that L of the hall element 11 is at L ₁ A positive charge appears at the end, and L of the Hall element 11 ₂ A negative charge appears at the end. At the same time, the conductor 21 moves to the right with respect to the magnetic field according to the right-hand rule, so that L in the conductor 21 ₃ A positive charge appears at the end, and L of the conductor 21 ₄ A negative charge appears at the end.

For example, the electromotive force of the conductor 21 is calculated by the formula E ═ BLV, where B is the magnetic field strength, L is the length of the conductor 21, and V is the speed of the transponder with respect to the train T; and the hall voltage U generated by the hall element 11 is approximately equal to BI, wherein I is the magnitude of the current loaded on the left and right sides of the hall element 11. The instantaneous speed V of the train T when passing through the transponder is approximately constant, the length of the conductor 21 is constant, and the currents I applied to the left and right sides of the hall element 11 are constant, that is, the electromotive force E generated by the conductor 21 and the hall voltage U generated by the hall element 11 change only with the change of the magnetic field, and in the scenario as shown in fig. 2, the period and the frequency of the electromotive force E generated by the conductor 21 and the hall voltage U generated by the hall element 11 changing with the magnetic field are the same. When the direction of the magnetic field changes, the electromotive force E generated by the conductor 21 and the positive and negative poles of the hall voltage U generated by the hall element 11 change synchronously, i.e., the phases of the first voltage signal and the second voltage signal are always the same.

In the rightward driving scene of the train T as shown in FIG. 3, L of the Hall element 11 is located ₁ Positive electricity appears at the endOn the Hall element 11 ₂ A negative charge appears at the end. At the same time, the conductor 21 moves leftward with respect to the magnetic field according to the right-hand rule, and therefore, L in the conductor 21 ₃ Negative charges appear at the end, and L of the conductor 21 ₄ A positive charge will appear at the end. When the direction of the magnetic field changes, the electromotive force E generated by the conductor 21 and the positive and negative poles of the hall voltage U generated by the hall element 11 change in synchronization, and at this time, the phases of the first voltage signal and the second voltage signal are always opposite. And, referring to the calculation formula E of the electromotive force of the conductive body 21 ═ BLV, if E is positive in the scenario of fig. 2, E is negative in the scenario of fig. 3, and the voltage U generated by the hall element 11 in both the scenarios of fig. 2 and 3 is positive.

In the above-described embodiment, the phases of the first voltage signal and the second voltage signal are the same when the train T travels leftward, and the phases of the first voltage signal and the second voltage signal are opposite when the train T travels rightward. Accordingly, the traveling direction of the train T can be determined based on the phase difference between the first voltage signal and the second voltage signal.

With continued reference to fig. 2 and 3, in a preferred embodiment of the transponder provided in the above embodiment, the transponder may be provided with a holder 6, the holder 6 may be arranged in the middle of the track, and the holder 6 is provided with the hall element 11 and the electrical conductor 21. The fixing base 6 can be arranged in the middle of the track and make the magnetic receiving surface of the Hall element 11 parallel to the plane of the track, and make L of the electric conductor 21 ₃ And L ₄ The centre line between the two ends is parallel to the plane of the track and perpendicular to the direction of extension of the track (i.e. perpendicular to the direction of travel of the train T). In this way, when the installation condition is satisfied, the hall element 11 can generate a first voltage signal that is more reliable and has a higher strength, and the conductor 21 can generate a second voltage signal that is more reliable and has a higher strength, thereby being more favorable for detecting the moving direction of the train T.

With continued reference to fig. 1, in a preferred implementation of the transponder provided in the above embodiment, the power supply module 5 comprises an electromagnetic energy receiving coil 51 and a rectifier 52; wherein, the electromagnetic energy receiving coil 51 can be electromagnetically coupled with the electromagnetic wave generated by the vehicle-mounted antenna to generate electric energy; the rectifier 52 can convert the electric energy generated by the electromagnetic energy receiving coil 51 into direct current to supply power to the hall element 11. Illustratively, when the vehicle-mounted antenna of the train approaches the transponder during the operation of the train, the electromagnetic energy receiving coil 51 of the transponder induces a magnetic field of 27MHz emitted by the vehicle-mounted antenna, and the power supply module 5 can generate electric energy through electromagnetic coupling to provide necessary power supply for the operation of the transponder. In this manner, the transponder can supply the hall element 11 with electric power generated by electromagnetic coupling with the vehicle-mounted antenna without providing a separate battery. In addition, the power supply module 5 can simultaneously supply power to other circuit modules in the transponder in addition to the hall element.

With continued reference to fig. 1, in a preferred implementation of the transponder provided in the above embodiment, the magnetic field sensing circuit 1 may further include a first amplifier 12 for amplifying the first voltage signal generated by the hall element 11. In addition, the motion sensing circuit 2 may further include a second amplifier 22 for amplifying the second voltage signal generated by the conductive body 21. By way of example, by providing the first amplifier 12 and the second amplifier 22, the strength of both the first voltage signal and the second voltage signal can be more easily made to meet the requirement of the detection circuit 3 for the input voltage, so that the detection circuit 3 can more accurately and reliably output the direction indicating signal for indicating the driving direction of the train.

As can be seen from the above embodiment, when the train T travels in a first direction (e.g., the train travels to the left in fig. 2) while the train T travels on the track and the transponder is in the magnetic field environment emitted by the on-board antenna of the train T, the phases of the first voltage signal of the magnetic field induction circuit 1 and the second voltage signal of the movement sensing circuit 2 are the same; and when the train T travels in a second direction opposite to the first direction (the train travels to the right in fig. 3), the first voltage signal of the magnetic field induction circuit 1 and the second voltage signal of the movement sensing circuit 2 are opposite in phase. Accordingly, the two input terminals of the detection circuit 3 may be connected to the magnetic field sensing circuit 1 and the movement sensing circuit 2, respectively, and output a first direction indicating signal indicating a traveling direction of the first train when the first voltage signal and the second voltage signal are in phase, and output a second direction indicating signal indicating a traveling direction of the second train when the first voltage signal and the second voltage signal are in opposite phase, and the traveling direction of the first train and the traveling direction of the second train are opposite, that is, the detection circuit 3 may output a direction indicating signal indicating the traveling direction of the train, and the message transmission module 4 may wirelessly transmit message information carrying information indicating the traveling direction of the train in response to the direction indicating signal. Thus, when the train T passes the transponder, the running direction of the train T can be confirmed by receiving the message information.

For example, due to factors such as the detection accuracy of the first voltage signal and the second voltage signal, the in-phase and the out-of-phase mentioned in the present embodiment may allow a certain phase error, as long as the first voltage signal and the second voltage signal are considered to be in-phase or out-of-phase within a set phase error range. In addition, when the first voltage signal or the second voltage signal is not detected, the detection circuit 3 outputs an abnormal signal, and the message sending module 4 can send a message carrying information indicating that the driving direction of the train cannot be determined in response to the abnormal signal.

For example, the phase detector may be disposed in the detection circuit 3 to determine whether the phases of the first voltage signal and the second voltage signal are the same. The phase detector is a device capable of identifying the phase difference of input signals, and is a circuit which enables an output voltage to have a definite relationship with the phase difference between two input signals.

In another preferred embodiment of the transponder, as shown in fig. 4, the detection circuit 3 comprises: a first comparator 311, a second comparator 312, and a third comparator 313; the input terminal of the first comparator 311 inputs the first time t ₁ And a second time t ₂ Two first voltage signals S ₁ (t ₁ ) And S ₁ (t ₂ ) And its output end is at the current first time t ₁ First voltage signal S ₁ (t ₁ ) Greater than the second time t ₂ First voltage signal S ₁ (t ₂ ) Time-out first comparison signalAnd its output terminal is at the current first time t ₁ First voltage signal S ₁ (t ₁ ) Less than the second time t ₂ First voltage signal S ₁ (t ₂ ) And outputs a second comparison signal. For example, when S ₁ (t ₁ )>S ₁ (t ₂ ) Then outputs the first comparison signal as "0", when S is ₁ (t ₁ )<S ₁ (t ₂ ) Outputting a second comparison signal of '1'; when within a certain error range S ₁ (t ₁ )＝S ₁ (t ₂ ) An invalid signal is output.

In addition, the input terminal of the second comparator 312 inputs the first time t ₁ And a second time t ₂ Two second voltage signals S ₂ (t ₁ ) And S ₂ (t ₂ ) And its output end is at the current first time t ₁ Second voltage signal S ₂ (t ₁ ) Greater than the second time t ₂ Second voltage signal S ₂ (t ₂ ) Outputs a first comparison signal, and outputs the first comparison signal at a first time t ₁ Second voltage signal S ₂ (t ₁ ) Less than the second time t ₂ Second voltage signal S ₂ (t ₂ ) And outputs a second comparison signal. For example, when S ₂ (t ₁ )>S ₂ (t ₂ ) Then outputs the first comparison signal as "0", when S is ₂ (t ₁ )<S ₂ (t ₂ ) Outputting a second comparison signal of '1'; when within a certain error range S ₂ (t ₁ )＝S ₂ (t ₂ ) An invalid signal is output.

The input end of the third comparator 313 is connected to the first comparator 311 and the second comparator 312, and when the signals output by the first comparator 311 and the second comparator 312 are the same, for example, both are "0" or "1", the output end of the third comparator 313 outputs a first direction indicating signal S indicating the first train running direction _d1 (ii) a And, when the signals output from the first comparator 311 and the second comparator 312 are different, for example, one of the outputs of the first comparator 311 and the second comparator 312 is "0" and the other is "1", the output terminal of the third comparator 313 outputsA second direction indicating signal S indicating the direction of travel of a second train _d2 . In addition, when any one of the first comparator 311 and the second comparator 312 outputs an invalid signal, the third comparator 313 does not need to compare the signals output by the first comparator 311 and the second comparator 312, and the third comparator may not output any signal at this time.

Preferably, the third comparator 313 may compare a plurality of sets of the first comparison signal and the second comparison signal, and output the first direction indicating signal S when the comparison results are consistent _d1 Or a second direction indicating signal S _d2 (ii) a And when the comparison result of the third comparator 313 is inconsistent, the third comparator outputs an abnormal signal "255", and the message sending module 4 can send a message carrying information indicating that the running direction of the train cannot be determined in response to the abnormal signal, so that the reliability of judging the moving direction of the train T can be further ensured.

As shown in fig. 5, in another preferred embodiment of the transponder according to the above embodiment, the detection circuit 3 includes an adder 321, a first average circuit 3221, a second average circuit 3222, a third average circuit 3223, and a comparison circuit 323. The input terminal of the first averaging circuit 3221 is connected to the magnetic field sensing circuit 1, and the output terminal thereof outputs a first voltage signal S for a predetermined time period ₁ And filtering, rectifying and integrating the first direct current voltage signal. The second averaging circuit 3222 has an input terminal connected to the motion sensing circuit 2 and an output terminal outputting a second voltage signal S for a predetermined time period ₂ And filtering, rectifying and integrating the second direct current voltage signal. The adder 321 has two input terminals respectively connected to the magnetic field sensing circuit 1 and the motion sensing circuit 2, and an output terminal outputting a superimposed signal obtained by superimposing the first voltage signal and the second voltage signal; the input terminal of the third averaging circuit 3223 is connected to the adder 321, and the output terminal thereof outputs a third dc voltage signal obtained by filtering, rectifying and integrating the superimposed signal within a set time duration. Thereby, when the first voltage signal S ₁ And a second voltage signal S ₂ When the phases of the first and second DC voltage signals are the same, the third DC voltage signal will be at the same timeGreater than the first direct current voltage signal and the second direct current voltage signal. And when the phases of the first voltage signal and the second voltage signal are opposite, the third direct current voltage signal output by the adder is smaller than the larger one of the first direct current voltage signal and the second direct current voltage signal. For example, the input terminal of the comparing circuit 323 is connected to the first averaging circuit 3221, the second averaging circuit 3222 and the third averaging circuit 3223, and outputs the first direction indicating signal S when the third dc voltage signal is greater than the first dc voltage signal and greater than the second dc voltage signal at the same time _d1 Indicating a first train direction of travel; outputting a second direction indication signal S when the third DC voltage signal is less than at least one of the first DC voltage signal and the second DC voltage signal _d2 And indicates a second train running direction opposite to the first train running direction, whereby the running direction of the train can be determined. In addition, when the comparison circuit 323 receives only one of the first dc voltage signal or the second dc voltage signal but not the other, the third comparison circuit may also output an abnormal signal, and the message sending module may send a message carrying information indicating that the driving direction of the train cannot be determined in response to the abnormal signal.

In a preferred implementation manner of the transponder provided in the foregoing embodiment, the message sending module 4 may further include an information storage module 41 and an information retrieving module 42; the information storage module 41 stores first message information indicating that the train runs in the forward direction and second message information indicating that the train runs in the reverse direction; the information retrieval module 42 is capable of retrieving first message information in response to the first direction indication signal and second message information in response to the second direction indication signal. In addition, the information storage module 41 may further store message information indicating that the driving direction of the train cannot be determined, and the information retrieval module 42 may further retrieve, in response to the detection circuit outputting the abnormal signal, a message information carrying the message information indicating that the driving direction of the train cannot be determined. In one embodiment, the last character of the train version number field may be used to indicate the driving direction of the train, for example, the last character "1" in the version number 1.1.1 indicates that the train is driving in the forward direction, the last character "2" in the version number 1.1.2 indicates that the train is driving in the reverse direction, and the last character "3" in the version number 1.1.3 indicates that the driving direction of the train cannot be determined. In addition, in addition to indicating the train traveling direction by characters in the version number, the train traveling direction may also be indicated by a reserved field in the message information.

Illustratively, in the running process of a train, when a vehicle-mounted antenna of the train approaches to a transponder, a power supply module 5 of the transponder receives electric energy provided by the vehicle-mounted antenna in an electromagnetic coupling mode to work, and a message sending module 4 continuously sends message information to the outside; and when the vehicle-mounted antenna on the train is far away from the transponder, the transponder loses electric energy and stops sending message information.

The utility model relates to a track traffic technical field, especially a transponder. The transponder comprises a magnetic field sensing circuit 1, a movement sensing circuit 2, a detection circuit 3 and a message sending module 4. The detection circuit 3 can output a direction indicating signal for indicating the train running direction according to the first voltage signal output by the magnetic field induction circuit 1 and the second voltage signal output by the mobile sensing circuit 2, and the message sending module 4 can send out message information carrying information indicating the train running direction in a wireless mode in response to the direction indicating signal. Thus, the purpose of confirming the traveling direction of the train T when the train T passes through one transponder can be achieved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Transponder adapted to be arranged on a track and to operate in response to electromagnetic waves emitted by an on-board antenna on a train (T) travelling on said track, characterized in that it comprises:

a magnetic field sensing circuit (1) comprising a hall element (11) powered by a power supply module (5), said hall element (11) being capable of generating a first voltage signal in response to a magnetic field of said vehicle antenna;

-a movement sensing circuit (2) comprising a conductor (21) connected in a conductive loop, a second voltage signal being generated at both ends of said conductor (21) in the environment of the magnetic field generated by said vehicle antenna during the travel of said train (T) through it;

a detection circuit (3) signally connected to said magnetic field induction circuit (1) and said movement sensing circuit (2) and operable to output a direction indication signal indicative of a direction of travel of said train in response to said first voltage signal and said second voltage signal;

and the message sending module (4) is in signal connection with the detection circuit (3) and can respond to the direction indication signal to send message information carrying information indicating the running direction of the train (T) in a wireless mode.

2. Transponder according to claim 1, characterized in that the two inputs of the detection circuit (3) are connected to the magnetic field induction circuit (1) and the movement sensing circuit (2), respectively, and output a first direction indication signal indicating a first train running direction when the first voltage signal and the second voltage signal are in phase, and output a second direction indication signal indicating a second train running direction when the first voltage signal and the second voltage signal are in opposite phase, and the first train running direction and the second train running direction are opposite.

3. Transponder according to claim 1, characterized in that the detection circuit (3) comprises:

a first comparator (311) having an input terminal to which two first voltage signals of a first time and a second time are input, and an output terminal to output a first comparison signal when the first voltage signal of the first time is greater than the first voltage signal of the second time, and an output terminal to output a second comparison signal when the first voltage signal of the first time is less than the first voltage signal of the second time;

a second comparator (312) having an input terminal to which two second voltage signals of the first time and the second time are input, and an output terminal to output a first comparison signal when the second voltage signal of the first time is greater than the second voltage signal of the second time, and an output terminal to output a second comparison signal when the second voltage signal of the first time is less than the second voltage signal of the second time;

a third comparator (313) having an input terminal connected to the first comparator (311) and the second comparator (312), and an output terminal outputting a first direction indication signal indicating a first train traveling direction when the signals output from the first comparator (311) and the second comparator (312) are the same, and an output terminal outputting a second direction indication signal indicating a second train traveling direction when the signals output from the first comparator (311) and the second comparator (312) are different.

4. Transponder according to claim 1, characterized in that the detection circuit (3) comprises:

a first averaging circuit (3221), an input end of which is connected to the magnetic field sensing circuit (1), and an output end of which outputs a first direct current voltage signal obtained by filtering, rectifying and integrating the first voltage signal within a set time duration;

a second averaging circuit (3222), an input end of which is connected to the motion sensing circuit (2), and an output end of which outputs a second dc voltage signal obtained by filtering, rectifying and integrating the second voltage signal within a set time duration;

an adder (321) having two input terminals connected to the magnetic field sensing circuit (1) and the motion sensing circuit (2), respectively, and an output terminal outputting a superimposed signal obtained by superimposing the first voltage signal and the second voltage signal;

a third average circuit (3223), an input end of which is connected to the adder (321), and an output end of which outputs a third dc voltage signal obtained by filtering, rectifying and integrating the superimposed signal within a set time duration;

a comparison circuit (323) having an input connected to the first averaging circuit (3221), the second averaging circuit (3222) and the third averaging circuit (3223), and outputting a first direction indicating signal indicating a first train driving direction when the third direct current voltage signal is greater than the first direct current voltage signal and simultaneously greater than the second direct current voltage signal; outputting a second direction indication signal indicating a second train running direction opposite to the first train running direction when the third direct current voltage signal is less than at least one of the first direct current voltage signal and the second direct current voltage signal.

5. Transponder according to one of claims 2 to 4, characterized in that the message sending module (4) further comprises:

an information storage module (41) which stores first message information indicating that the train (T) is running in the forward direction and second message information indicating that the train (T) is running in the reverse direction;

an information retrieval module (42) capable of retrieving the first message information in response to the first direction indication signal and retrieving the second message information in response to the second direction indication signal.

6. Transponder according to claim 1, characterized by the fact that it further comprises a fixed seat (6);

the Hall element (11) and the conductor (21) are arranged on the fixed seat (6);

the fixed seat (6) can be arranged in the middle of the track, the magnetic receiving surface of the Hall element (11) is parallel to the plane of the track, and meanwhile, the central line between the two ends of the conductive body (21) is parallel to the plane of the track and perpendicular to the extending direction of the track.

7. Transponder according to claim 1, characterized in that the power supply module (5) comprises an electromagnetic energy receiving coil (51) and a rectifier (52); wherein,

the electromagnetic energy receiving coil (51) can be electromagnetically coupled with electromagnetic waves generated by the vehicle-mounted antenna to generate electric energy;

the rectifier (52) can convert the electric energy generated by the electromagnetic energy receiving coil (51) into direct current and then supply power to the Hall element (11).

8. Transponder according to claim 1, characterized in that the magnetic field sensing circuit (1) further comprises a first amplifier (12) for amplifying a first voltage signal generated by the hall element (11); and/or the like and/or,

the motion sensing circuit (2) is also provided with a second amplifier (22) for amplifying a second voltage signal generated by the conductor (21).