Method and system for automatically calculating and checking train length

Abstract

The invention provides a method and a system for automatically calculating and checking train length, two ends of a train are respectively provided with a vehicle-mounted device, and the method comprises the following steps: S1, starting the vehicle-mounted devices; the two vehicle-mounted devices independently receive and interact transponder information in real time; and S2, the home terminal vehicle-mounted equipment judges that the home terminal vehicle-mounted equipment and the opposite terminal vehicle-mounted equipment respectively pass through the same ground passive transponder at the moment TA and the moment TB based on self transponder information and transponder information received from the opposite terminal, and the home terminal vehicle-mounted equipment calculates the train length based on self walking distances at the moment TA and the moment TB. The method has the advantages that the safety risk caused by the fact that a driver selects the wrong train length can be effectively avoided, and safe operation of the train is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of rail transit technology, and in particular to a method and system for automatically calculating and checking train length. Background Art

[0002] Train length is data closely related to train safety in the train operation control system. When calculating the dynamic protection curve, the on-board equipment needs to determine the slope, speed limit and other line data covered by the train length range based on the train length. At the same time, when the train speeds up, it is necessary to consider the rear of the train based on the train length to ensure that the protective speed can be increased only after the rear of the train passes the lower speed limit point. In the mobile block train control system, the on-board equipment needs to superimpose the confidence interval of the ranging based on the length of the train to report the safe length of the train to the ground equipment. The ground equipment tracks the train forward and backward for safety protection based on the position of the train and the safe length.

[0003] Currently, the length of trains is selected and confirmed by the driver. Manual operation may lead to incorrect selection and confirmation, which poses a great risk to the safe operation of the train. Summary of the invention

[0004] The purpose of the present invention is to provide a method and system for automatically calculating and checking the length of a train, by using the on-board equipment at both ends of the train to exchange transponder information, to determine the time T when the on-board equipment at the local end and the on-board equipment at the other end pass through the same ground passive transponder. A and time T B , combined with the local vehicle equipment at time T A and time T B The running distance of the train is automatically calculated and checked. The present invention can effectively avoid the safety risks caused by the driver choosing the wrong train length, thereby ensuring the safe operation of the train.

[0005] In order to achieve the above object, the present invention provides a method for automatically calculating and checking the length of a train, wherein an on-board device is respectively provided at both ends of the train, and the method comprises the steps of:

[0006] S1, starting the vehicle-mounted device; the two vehicle-mounted devices independently receive and exchange transponder information in real time;

[0007] The transponder information includes: the number of the ground passive transponder and the time when the vehicle-mounted device passes the ground passive transponder;

[0008] S2: The local vehicle-mounted device determines, based on the transponder information, that the local vehicle-mounted device and the opposite vehicle-mounted device are at time T respectively. A Time T B Passing the same ground passive transponder; the local vehicle-mounted device based on itself at time T A and time T BThe train length is calculated based on the running distance.

[0009] Optionally, the on-board device also collects the running signal of the train and records the collection time of each running signal; in step S1, after the on-board device is started, it also automatically calibrates the running time difference ΔT between two on-board devices, including the steps of:

[0010] S11, the two vehicle-mounted devices interact in real time with each other about the operation signals collected and the collection time of the operation signals;

[0011] S12: The vehicle-mounted device calculates a collection time difference for a corresponding operation signal, and averages the collection time differences of multiple operation signals to obtain the operation time difference ΔT.

[0012] Optionally, the operating signal includes at least one of a feedback signal of train braking and an activation / sleep signal of the cab.

[0013] Optionally, in step S2, the vehicle-mounted device at the local end changes the time T based on the running time difference ΔT. B Calibrated to T A′ ;

[0014] The local vehicle-mounted device is based on its own A 、T A′ Travel distance L TA-A , L TA′-A , the train length L is calculated to be L TA-A -L TA′-A |+D1+D2;

[0015] Where |·| represents the absolute value; D1 and D2 are the distances between the BTM antenna of the on-board device at the local end and the BTM antenna of the on-board device at the other end and the corresponding train end.

[0016] Optionally, the vehicle-mounted device stores the transponder information received within the most recently set time period and the travel distance of the vehicle-mounted device at each moment;

[0017] Travel distance L TA′-A The calculation steps include:

[0018] S21, the on-board device at the local end searches for the time T in the stored transponder information A′ Adjacent time T p ' revious-A 、T b ' ack-A ; The vehicle-mounted device at this end is at time T p ' revious-A With time T b ' ack-A The time interval passes through the peer vehicle equipment at time TB Passive ground transponders passing by;

[0019] S22, based on the time T p ' revious-A 、T b ' ack-A The corresponding travel distance L′ previous-A , L′ back-A ; By interpolation method, the vehicle-mounted device at the local end is calculated at time T A′ Travel distance L TA′-A ;

[0020] L TA′-A =L′ previous-A +(L′ back-A -L′ previous-A )(T A′ -T p ' revious-A ) / (T b ' ack-A -T p ' revious-A ).

[0021] Optionally, the method for automatically calculating and verifying the train length further comprises the steps of:

[0022] S3. The two on-board devices exchange their respective calculated train lengths; if the difference between the train lengths calculated by the two on-board devices is greater than a set length threshold, the on-board device generates an alarm message.

[0023] Optionally, the method for automatically calculating and verifying the train length further comprises the steps of:

[0024] S4. The on-board equipment checks the calculated train length with the train length manually input by the driver. If the difference between the two exceeds the set length threshold, the on-board equipment generates an alarm message.

[0025] The present invention also provides a system for automatically calculating and checking train length, which is used to implement the method described in the present invention, comprising:

[0026] multiple ground passive transponders;

[0027] Two on-board devices are respectively arranged at two ends of the train; the two on-board devices independently receive and interact in real time with the transponder information sent by the ground passive transponder;

[0028] The local vehicle-mounted device determines based on the transponder information that the local vehicle-mounted device and the opposite vehicle-mounted device are at time T A Time T B Passing the same ground passive transponder; the local vehicle-mounted device based on itself at time T A and time TB The train length is calculated based on the running distance.

[0029] Optionally, the vehicle-mounted device includes: a transponder information receiving unit and a BTM antenna; the transponder information receiving unit receives the transponder information through the BTM antenna.

[0030] Optionally, the vehicle-mounted device further includes: a communication unit, used to realize data transmission between two vehicle-mounted devices.

[0031] Optionally, the vehicle-mounted device further includes: a vehicle-mounted main control unit, which is communicatively connected to the communication unit and the transponder information receiving unit;

[0032] The two vehicle-mounted main control units exchange the transponder information through their respective communication units;

[0033] The vehicle main control unit determines the status of the local vehicle device and the opposite vehicle device at time T based on the transponder information received by the two vehicle devices. A Time T B Passing the same ground passive transponder, calculate the local vehicle-mounted equipment at time T A Time T B The running distance, and according to the local vehicle equipment at time T A Time T B The train length is calculated based on the running distance.

[0034] Optionally, the on-board equipment also includes: a train interface unit, which is used to collect the running signal of the train and provide the running signal and the collection time of the running signal to the on-board main control unit.

[0035] The operation signal and the collection time of the operation signal are exchanged between the two vehicle-mounted main control units through the communication unit;

[0036] The onboard main control unit calculates the running time difference between the two onboard devices based on the running signals collected by the two train interface units and the collection time of the corresponding running signals, and converts the time T B Calibrated to T A′ ;

[0037] The vehicle main control unit calculates the vehicle device at the time T A′ The running distance is calculated according to the vehicle-mounted device at time T A Time T A′ The train length is calculated based on the running distance.

[0038] Optionally, the vehicle-mounted device also includes: a human-machine interface unit, which is used to visually display the working data of the vehicle-mounted main control unit and respond to the driver's operation.

[0039] Optionally, the vehicle-mounted equipment also includes:

[0040] Speed ​​measuring equipment, used to measure the speed of trains;

[0041] A speed and distance measuring unit calculates the travel distance of the vehicle-mounted device based on the measurement result of the speed measuring device.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1) The method and system for automatically calculating and checking the length of a train of the present invention determines the time T when the on-board equipment at the local end and the on-board equipment at the opposite end pass through the same ground passive transponder through the on-board equipment exchange transponder information at both ends of the train. A and time T B , combined with the local vehicle equipment at time T A and time T B The running distance of the train is automatically calculated and checked. The present invention can effectively avoid the safety risks caused by the driver choosing the wrong train length, thereby ensuring the safe operation of the train.

[0044] 2) The present invention also calibrates the operating time difference of the two vehicle-mounted devices based on the operating signals interacting between the two vehicle-mounted devices and the acquisition time of the operating signals, and calibrates the time T based on the operating time difference B , which greatly improves the calculation accuracy of train length. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are an embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0046] Figure 1 It is a flow chart of a method for automatically calculating and checking train length in an embodiment of the present invention;

[0047] Figure 2 It is a structural schematic diagram of a system for automatically calculating and checking train length in an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the time and position of the on-board equipment at both ends of the train passing the same ground passive balise in an embodiment of the present invention;

[0049] Figure 4 The present invention is another embodiment of a flow chart of a method for automatically calculating and verifying train length. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0052] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0053] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0054] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0055] In addition, in the description of the present application, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0056] Figure 1 The flowchart of the method for automatically calculating and checking the length of a train in an embodiment of the present invention is shown in FIG. 1. The present invention provides an on-board device 1 at each end of the train (respectively referred to as the first end of the train and the second end of the train), and the method comprises the following steps:

[0057] S1. Start the vehicle-mounted device; the two vehicle-mounted devices independently receive and exchange transponder information in real time.

[0058] like Figure 2As shown, the ground passive transponder 80 is installed on the track and is used to provide transponder information to the vehicle-mounted device 1. The transponder information includes: the number of the ground passive transponder 80 and the time when the vehicle-mounted device 1 passes the ground passive transponder 80. Figure 2 As shown, the vehicle-mounted device 1 is equipped with a transponder information receiving unit 12 and a BTM antenna 11 , and the transponder information receiving unit 12 receives the transponder information of the ground passive transponder 80 through the BTM antenna 11 .

[0059] In this embodiment, the vehicle-mounted device 1 stores the transponder information received within the most recent set time period (including the transponder information sent by the ground passive transponder 80 and the transponder information sent by the opposite vehicle-mounted device 1) and the travel distance of the vehicle-mounted device 1 at each moment.

[0060] In a preferred embodiment, the vehicle-mounted device 1 also collects the train's operating signals (including at least one of the train's braking feedback signal and the cab's activation / sleep signal) and records the collection time of each operating signal. After the vehicle-mounted device 1 is started, it also automatically calibrates the operating time difference ΔT between the two vehicle-mounted devices 1, including the steps of:

[0061] S11, the two vehicle-mounted devices interact in real time with each other's collected operation signals and the collection time of the operation signals;

[0062] The onboard equipment 1 at the first end of the train and the second end of the train have collected N running signals. Let T S1A 、T S2A , ..., T SNA They represent the acquisition time of the N running signals by the on-board equipment 1 at the first end of the train, T S1B 、T S2B , ..., T SNB They respectively represent the collection time of these N operating signals by the on-board equipment 1 at the second end of the train.

[0063] S12. The vehicle-mounted device calculates a collection time difference for a corresponding operation signal, and averages the collection time differences of multiple operation signals to obtain an operation time difference ΔT.

[0064]

[0065] S2, the local vehicle-mounted device determines the local vehicle-mounted device and the opposite vehicle-mounted device at time T based on the transponder information (mainly based on the number of the ground passive transponder 80). A Time T B Through the same ground passive transponder 80 (such as Figure 3 As shown); the vehicle-mounted device at this end is based on its own A and time T B The train length is obtained by the running distance.

[0066] In the present invention, the vehicle-mounted device 1 passing through the ground passive transponder 80 refers to the corresponding BTM antenna 11 passing through the ground passive transponder 80. The travel distance of the vehicle-mounted device 1 refers to the travel distance of the corresponding BTM antenna 11, that is, the distance traveled by the corresponding BTM antenna 11 from the first ground passive transponder 80 passed to the current position.

[0067] In this embodiment, the on-board device 1 at the first end of the train is used as the on-board device at the local end, and the on-board device 1 at the second end of the train is used as the on-board device at the opposite end. This is only an example. In other embodiments, the on-board device 1 at the second end of the train can also be used as the on-board device at the local end, and the on-board device 1 at the first end of the train can be used as the on-board device at the opposite end. This is not limited in the present invention.

[0068] Set the local vehicle-mounted device at time T A and time T B The travel distance is recorded as L TA-A , L TB-A , the train length is recorded as L.

[0069] L=|L TA-A -L TB-A |+D1+D2. Here, |·| means taking the absolute value.

[0070] D1 is the distance between the BTM antenna 11 at the first end of the train and the end of the first end of the train, and D2 is the distance between the BTM antenna 11 at the second end of the train and the end of the second end of the train. Both D1 and D2 are pre-stored in the on-board device 1. If D1 and D2 are installed symmetrically, they can be the same distance.

[0071] like Figure 3 As shown, the on-board equipment at this end (the on-board equipment 1 at the first end of the train) is at time T A Through the ground passive transponder 80 numbered B1, the on-board device at the other end (the on-board device 1 at the second end of the train) at time T B Passing through the ground passive transponder 80 numbered B1.

[0072] In this embodiment, the local vehicle-mounted device searches the stored transponder information and learns that the local vehicle-mounted device is at the same time as time T B Two adjacent moments T previous-A 、T back-A Passing the same ground passive transponder 80, it can be calculated by interpolation based on the local vehicle-mounted device at time T previous-A 、T back-A The running distance L is calculated. TB-A .

[0073] In a preferred embodiment, the vehicle-mounted device at the local end also sets the time T based on the running time difference ΔT. B Calibrated to T A′ , T A′ =T B +ΔT. The vehicle-mounted device at this end is based on its own A 、T A′ Travel distance L TA-A , L TA′-A , the train length L is calculated to be L TA-A -L TA′-A |+D1+D2.

[0074] Travel distance L TA′-A The calculation steps include:

[0075] S21, the on-board device at the local end searches for the time T in the stored transponder information A′ Adjacent time T p ' revious-A 、T b ' ack-A ; The vehicle-mounted device at this end is at time T p ' revious-A With time T b ' ack-A During the time interval, the vehicle-mounted device at the other end passes through the time T B Passing ground passive transponder 80;

[0076] S22, based on the time T p ' revious-A 、T b ' ack-A The corresponding travel distance L′ previous-A , L′ back-A ; By interpolation method, the vehicle-mounted device at the local end is calculated at time T A′ Travel distance L TA′-A ;

[0077] L TA′-A =L′ previous-A +(L′ back-A -L′ previous-A )(T A′ -T p ' revious-A ) / (T b ' ack-A -T p ' revious-A ).

[0078] like Figure 4 In another embodiment, the method for automatically calculating and verifying the train length further comprises the steps of:

[0079] S3. The two on-board devices exchange their respective calculated train lengths; if the difference between the train lengths calculated by the two on-board devices is greater than a set length threshold, the on-board device generates an alarm message.

[0080] The method for calculating the train length by the on-board equipment 1 at the second end of the train is the same as steps S1 and S2. It is only necessary to take the on-board equipment 1 at the second section of the train as the on-board equipment at the local end, which will not be described in detail here.

[0081] S4. The on-board equipment checks the calculated train length with the train length manually input by the driver. If the difference between the two exceeds the set length threshold, the on-board equipment generates an alarm message.

[0082] For the method of selecting the train length, the train length calculated by the method of the present invention can be used to check the train length selected by the driver. When the train length is found to be different, the driver can be prompted to reselect and confirm the train length.

[0083] Furthermore, only this method can be used to automatically calculate the length of the train, eliminating the driver's operation of selecting the length of the train.

[0084] The present invention can effectively avoid the safety risks caused by the driver selecting the wrong train length, thereby ensuring the safe operation of the train. The present invention also calibrates the operating time difference of the two on-board devices 1 based on the operating signals interacting between the two on-board devices 1 and the acquisition time of the operating signals, and calibrates the time T based on the operating time difference. B , which greatly improves the calculation accuracy of train length.

[0085] Figure 2 It is a schematic structural diagram of a system for automatically calculating and verifying train length in an embodiment of the present invention. The system comprises: a plurality of ground passive transponders 80 and two on-board devices 1.

[0086] Two on-board devices 1 are respectively arranged at two ends of the train; the two on-board devices 1 independently receive and interact in real time with the transponder information sent by the ground passive transponder 80 .

[0087] like Figure 2 As shown, the vehicle-mounted device 1 includes: a transponder information receiving unit 12 , a BTM antenna 11 , a communication unit 30 , and a vehicle-mounted main control unit 20 .

[0088] The transponder information receiving unit 12 receives the transponder information sent by the ground passive transponder 80 through the BTM antenna 11 .

[0089] The communication unit 30 is used to implement data transmission between two vehicle-mounted devices 1 .

[0090] The vehicle-mounted main control unit 20 is connected to the communication unit 30 and the transponder information receiving unit 12. The two vehicle-mounted main control units 20 exchange transponder information through their respective communication units 30. The vehicle-mounted main control unit 20 determines the vehicle-mounted device at the local end and the vehicle-mounted device at the opposite end at time T based on the transponder information received by the two vehicle-mounted devices 1. A Time T B Passing through the same ground passive transponder 80, calculate the local vehicle-mounted equipment at time T A Time T B The running distance, and according to the local vehicle equipment at time T A Time T B The train length is calculated based on the running distance.

[0091] Further, such as Figure 2 As shown, the vehicle-mounted device 1 further includes: a train interface unit 40, which is used to collect the running signal of the train and provide the running signal and the collection time of the running signal to the vehicle-mounted main control unit 20. The communication unit 30 is used to realize the exchange of the running signal and the collection time of the running signal between the two vehicle-mounted main control units 20.

[0092] The onboard main control unit 20 calculates the running time difference between the two onboard devices 1 based on the running signals collected by the two train interface units 40 and the collection time of the corresponding running signals, and converts the time T B Calibrated to T A′ .

[0093] The vehicle-mounted main control unit 20 calculates the vehicle-mounted device at the time T A′ The running distance is calculated according to the vehicle-mounted device at time T A Time T A′ The train length is calculated based on the running distance.

[0094] Further, such as Figure 2 As shown, the vehicle-mounted device 1 further includes: a human-machine interface unit 50, which is used to visually display the working data of the vehicle-mounted main control unit 20 and respond to the driver's operation.

[0095] Further, such as Figure 2 As shown, the vehicle-mounted device 1 further includes: a speed measuring device 61 and a speed measuring and distance measuring unit 62. The speed measuring device 61 is used to measure the speed of the train. The speed measuring and distance measuring unit 62 calculates the travel distance of the vehicle-mounted device based on the measurement result of the speed measuring device 61, and sends the calculated travel distance to the vehicle-mounted main control unit 20.

[0096] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0097] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for automatically calculating and checking train length, characterized in that: An on-board device is provided at each end of the train, and the method comprises the steps of: S1, starting the vehicle-mounted device; the two vehicle-mounted devices independently receive and exchange transponder information in real time; The transponder information includes: the number of the ground passive transponder and the time when the vehicle-mounted device passes the ground passive transponder; S2: The local vehicle-mounted device determines, based on the transponder information, that the local vehicle-mounted device and the opposite vehicle-mounted device are at time T respectively. A Time T B Passing the same ground passive transponder; the local vehicle-mounted device based on itself at time T A and time T B The train length is calculated based on the running distance.

2. The method for automatically calculating and checking train length according to claim 1, characterized in that: The on-board device also collects the running signal of the train and records the collection time of each running signal; in step S1, after the on-board device is started, the running time difference ΔT between two on-board devices is automatically calibrated, including the steps of: S11, the two vehicle-mounted devices interact in real time with each other about the operation signals collected and the collection time of the operation signals; S12: The vehicle-mounted device calculates a collection time difference for a corresponding operation signal, and averages the collection time differences of multiple operation signals to obtain the operation time difference ΔT.

3. The method for automatically calculating and checking train length as claimed in claim 2, characterized in that: The operation signal includes at least one of a feedback signal of train braking and an activation / sleep signal of a cab.

4. The method for automatically calculating and checking train length as claimed in claim 2, characterized in that: In step S2, the vehicle-mounted device at the local end converts the time T B Calibrated to T A′ ; The local vehicle-mounted device is based on its own A 、T A′ Travel distance L TA-A , L TA′-A , the train length L is calculated to be L TA-A -L TA′-A |+D1+D2; Where |·| represents the absolute value; D1 and D2 are the distances between the BTM antenna of the on-board device at the local end and the BTM antenna of the on-board device at the other end and the corresponding train end.

5. The method for automatically calculating and checking train length as claimed in claim 4, characterized in that: The vehicle-mounted device stores the transponder information received within the most recently set time period and the travel distance of the vehicle-mounted device at each moment; Travel distance L TA′-A The calculation steps include: S21, the on-board device at the local end searches for the time T in the stored transponder information A′ Adjacent time T p ' revious-A 、T b ' ack-A ; The vehicle-mounted device at this end is at time T p ' revious-A With time T b ' ack-A The time interval passes through the peer vehicle equipment at time T B Passive ground transponders passing by; S22, based on the time T p ' revious-A 、T b ' ack-A The corresponding travel distance L′ previous-A , L′ back-A ; By interpolation method, the vehicle-mounted device at the local end is calculated at time T A′ Travel distance L TA′-A ; L TA′-A =L′ previous-A +(L′ back-A -L′ previous-A )(T A′ -T p ′ revious-A ) / (T b ′ ack-A -T p ′ revious-A )。 6. The method for automatically calculating and checking train length according to claim 1, characterized in that: Also includes the steps: S3. The two on-board devices exchange their respective calculated train lengths; if the difference between the train lengths calculated by the two on-board devices is greater than a set length threshold, the on-board device generates an alarm message.

7. The method for automatically calculating and checking train length according to claim 1, characterized in that: Also includes the steps: S4. The on-board equipment checks the calculated train length with the train length manually input by the driver. If the difference between the two exceeds the set length threshold, the on-board equipment generates an alarm message.

8. A system for automatically calculating and checking train length, used to implement the method according to any one of claims 1 to 7, characterized in that: Include: multiple ground passive transponders; Two on-board devices are respectively arranged at two ends of the train; the two on-board devices independently receive and interact in real time with the transponder information sent by the ground passive transponder; The local vehicle-mounted device determines based on the transponder information that the local vehicle-mounted device and the opposite vehicle-mounted device are at time T A Time T B Passing the same ground passive transponder; the local vehicle-mounted device based on itself at time T A and time T B The train length is calculated based on the running distance.

9. The system for automatically calculating and checking train length as claimed in claim 8, characterized in that: The vehicle-mounted device comprises: a transponder information receiving unit and a BTM antenna; the transponder information receiving unit receives the transponder information through the BTM antenna.

10. The system for automatically calculating and checking train length as claimed in claim 9, characterized in that: The vehicle-mounted device also includes: a communication unit, which is used to realize data transmission between two vehicle-mounted devices.

11. The system for automatically calculating and checking train length as claimed in claim 10, characterized in that: The vehicle-mounted device comprises: a vehicle-mounted main control unit, which is communicatively connected to the communication unit and the transponder information receiving unit; The two vehicle-mounted main control units exchange the transponder information through their respective communication units; The vehicle main control unit determines the status of the local vehicle device and the opposite vehicle device at time T based on the transponder information received by the two vehicle devices. A Time T B Passing the same ground passive transponder, calculate the local vehicle-mounted equipment at time T A Time T B The running distance, and according to the local vehicle equipment at time T A Time T B The train length is calculated based on the running distance.

12. The system for automatically calculating and checking train length as claimed in claim 11, characterized in that: The vehicle-mounted equipment also includes: a train interface unit, which is used to collect the running signal of the train and provide the running signal and the collection time of the running signal to the vehicle-mounted main control unit. The operation signal and the collection time of the operation signal are exchanged between the two vehicle-mounted main control units through the communication unit; The onboard main control unit calculates the running time difference between the two onboard devices based on the running signals collected by the two train interface units and the collection time of the corresponding running signals, and converts the time T B Calibrated to T A′ ; The vehicle main control unit calculates the vehicle device at the time T A′ The running distance is calculated according to the vehicle-mounted device at time T A Time T A′ The train length is calculated based on the running distance.

13. The system for automatically calculating and checking train length as claimed in claim 11, characterized in that: The vehicle-mounted equipment also includes: a human-machine interface unit, which is used to visually display the working data of the vehicle-mounted main control unit and respond to the driver's operation.

14. The system for automatically calculating and checking train length as claimed in claim 8, characterized in that: The vehicle equipment also includes: Speed ​​measuring equipment, used to measure the speed of trains; A speed and distance measuring unit calculates the travel distance of the vehicle-mounted device based on the measurement result of the speed measuring device.

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