Cable Detection System and Method

Abstract

The present invention provides a cable detection system and method. The system includes: two power units, and at least one cable connected between the two power units; each power unit respectively includes a gateway unit and a detection unit, and the cable is connected between the two gateway units through each detection unit; each detection unit is respectively used for disconnecting the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is used for sending a detection signal to another detection unit through the cable, or for receiving a detection signal through the cable. The present invention can realize the detection of cable parameters without disassembling the cable, improving the efficiency of cable detection.

Description

Technical Field

[0001] The present invention relates to the field of train network control systems, and particularly to a cable detection system and method. Background Art

[0002] With the continuous development of railway transportation, in order to improve the economic indicators of railway transportation, the operation mode of multiple unit trains running in multiple units is often adopted. To achieve train-level communication of multiple unit trains, the technology of Wire Train Bus (WTB) is usually adopted at present to realize the transmission of process data and message data of multiple unit trains. At present, there are various technologies or devices for measuring communication cables, including measuring parameters such as cable length, impedance, and attenuation.

[0003] At present, in order to accurately locate the fault point of a train, it is usually necessary to measure the parameters of the WTB cable, such as measuring parameters such as the length, impedance, and attenuation of the cable. In the prior art, when measuring the parameters of the WTB cable, a measuring device that cooperates with a host and a slave is usually adopted, that is, the host is connected to one end of the cable to be measured, the slave is connected to the other end of the cable to be measured, a sine wave or square wave signal is sent by the host, and then the cable state is analyzed according to the waveform state reflected by the slave and the measurement of the cable parameters is completed.

[0004] However, in the prior art, when measuring the cable parameters, it is usually carried out on the ground with a handheld device, and both ends of the cable must be connected to the measuring device respectively. Therefore, for a multiple unit train that has been formed, the cable needs to be disassembled and then measured, resulting in low efficiency of cable measurement and inability to measure the WTB cable at any time and place. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present invention provides a cable detection system and method, which can realize the measurement of cable parameters without disassembling the cable for a multiple unit train that has been formed, not only can improve the cable detection efficiency, but also can measure the WTB cable at any time and place, and improve the convenience of cable measurement.

[0006] In a first aspect, an embodiment of the present invention provides a cable detection system, including:

[0007] Two power units, and at least one cable connected between the two power units;

[0008] Each of the power units respectively includes a gateway unit and a detection unit, and the cable is connected between the two gateway units through each of the detection units;

[0009] Each of the detection units is respectively configured to disconnect the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is configured to send a detection signal to another detection unit through the cable, or to receive the detection signal through the cable.

[0010] The technical solution provided by the present invention disconnects the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and then a detection unit sends a detection signal to another detection unit through the cable for cable detection, solving the problem in the prior art that the cable needs to be disassembled for cable detection.

[0011] Optionally, each of the power units further includes a control unit, and each of the control units is respectively connected to the corresponding gateway unit and the corresponding detection unit; the control unit is configured to control the detection unit to detect the parameters of the cable.

[0012] Optionally, each of the power units further includes a human-machine interface unit, and each of the human-machine interface units is respectively connected to the corresponding control unit, and the human-machine interface unit is configured to output the detection result.

[0013] The control unit and the human-machine interface unit are used to implement vehicle bus communication and command interaction during the cable detection process.

[0014] Optionally, each of the detection units respectively includes a power supply module, an interface module, a processor, and a bus interface group module;

[0015] The power supply module is respectively connected to the interface module, the processor, and the bus interface group module, and the power supply module is configured to supply power to the detection unit;

[0016] The interface module is respectively connected to the corresponding control unit and the processor, and the interface module is configured to receive the detection instruction sent by the control unit and to receive the detection result sent by the processor;

[0017] The processor is respectively connected to the interface module and the bus interface group module, and the processor is configured to control the transceiver of the detection signal;

[0018] The bus interface group module is respectively connected to the processor and the cable.

[0019] In the technical solution provided by the present invention, the detection unit takes the processor as the core, controls the transmission, reception and digital processing of detection signals. The interface module is used to realize the instruction interaction between the central control units and the reception of test instructions and the feedback of test results. The power supply module supplies power to the detection unit. The bus interface group module automatically forms a logic pulse signal with a certain width according to the encoded signal transmitted by the processor and transmits it to the cable under test. At the same time, the return signal on the cable under test is transmitted to the processor for analysis and processing, so as to achieve the purpose of detecting the cable parameters.

[0020] Optionally, the bus interface group module includes at least one switching component, and each switching component includes a transceiver, a first switch and a second switch. The first switch is located between the transceiver and the gateway unit in the power unit where the first switch is located, and the second switch is located between the transceiver and another power unit;

[0021] The first switch is used to disconnect the electrical connection between the detection unit and the corresponding gateway unit before detecting the cable; the second switch is used to control the electrical connection between the transceiver and the other power unit.

[0022] The transceiver is used to receive and send signals. According to the encoded signal sent by the processor, it automatically forms a logic pulse signal with a certain width. This pulse is transmitted to the cable under test through transceiver. At the same time, the return signal on the cable under test is converted into a digital signal and sent to the processor for analysis and processing. Before the test starts, the first switch disconnects the electrical connection between the cable and the corresponding gateway unit, so that the measurement process does not require the cable to be disassembled, and at the same time, other systems or devices do not need to be powered off to realize cable measurement.

[0023] Optionally, the cable is a Wired Train Bus (WTB).

[0024] Optionally, the parameters of the cable include at least one of the following information: the connection relationship of the cable, whether the cable is short-circuited, the length information of the cable, the average characteristic impedance of the cable, the attenuation value of the cable, the return loss of the cable, and the position of the abnormal point of the cable.

[0025] In a second aspect, an embodiment of the present invention provides a cable detection method, including:

[0026] Receiving a detection instruction sent by a user, where the detection instruction is used to instruct a first detection unit to detect the parameters of a cable;

[0027] According to the detection instruction, disconnect the electrical connection between the cable and the gateway unit, and send a detection signal to a second detection unit through the cable; the first detection unit and the second detection unit are located in different power units;

[0028] Receive the detection result of the parameters of the cable returned by the second detection unit.

[0029] Optionally, the method further includes:

[0030] Output the detection result through the human-machine interface unit.

[0031] Optionally, the parameters of the cable include at least one of the following information: the connection relationship of the cable, whether the cable is short-circuited, the length information of the cable, the average characteristic impedance of the cable, the attenuation value of the cable, the return loss of the cable, and the position of the abnormal point of the cable.

[0032] The cable detection system and method provided by the present invention include two power units and at least one cable connected between the two power units. Each power unit includes a gateway unit and a detection unit respectively, and the cable is connected between the two gateway units through each detection unit; each detection unit is respectively used for disconnecting the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is used for sending a detection signal to another detection unit through the cable, or for receiving a detection signal through the cable. Since each detection unit disconnects the electrical connection between the cable and the corresponding gateway unit when detecting the cable, the cable disassembly process is avoided, and then the detection unit sends a detection signal to another detection unit through the cable to realize cable detection, improving the efficiency of cable detection. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0034] Figure 1A It is a schematic structural diagram of the cable detection system provided in the first embodiment of the present invention;

[0035] Figure 1B It is a schematic structural diagram of the cable detection system provided in the second embodiment of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the detection unit of the cable detection system provided in the second embodiment of the present invention;

[0037] Figure 3 is Figure 2 The schematic diagram of the bus interface group module structure in;

[0038] Figure 4 It is the schematic diagram of the panel interface of the cable detection system;

[0039] Figure 5 It is a schematic flowchart of the first embodiment of the cable detection method provided by the embodiment of the present invention;

[0040] Figure 6 It is a schematic test flowchart of the first embodiment of the cable detection method provided by the embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1, 2: Power unit

[0043] 1-1, 2-1: Detection unit

[0044] 1-2, 2-2: Gateway unit

[0045] 1-3, 2-3: Control unit

[0046] 1-4, 2-4: Human-machine interface unit

[0047] 3, A, B: Cables

[0048] 4: Trailer carriage

[0049] 1-1-1: Power module

[0050] 1-1-2: Processor

[0051] 1-1-3: Interface module

[0052] 1-1-4: Power module

[0053] 1-1-1-1, 1-1-1-3: First switch

[0054] 1-1-1-2, 1-1-1-4: Second switch

[0055] 1-1-1-5: Transceiver A

[0056] 1-1-1-6: Transceiver B

[0057] A1, A2, B1, B2: Cable interfaces

[0058] ETH: Vehicle Ethernet communication interface

[0059] PWR: Power interface Detailed implementation manners

[0060] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0061] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0062] The cable detection system provided by the present invention can be used in scenarios for detecting cable parameters. Hereinafter, taking the detection of train cable parameters as an example, the specific implementation manners of the present invention will be introduced.

[0063] In the electric traction operation of railway main lines, sometimes a single locomotive traction often fails to meet the transportation requirements, and multiple locomotive traction is required. In addition, in order to improve the transport capacity of trains, multiple-unit operation is also a common operation mode for multiple-unit trains, that is, two multiple-unit trains of the same type are coupled and operated. The first multiple-unit train in the running forward direction is responsible for operation. After the multiple-unit train is reconnected, the transport capacity is doubled.

[0064] When electric locomotives or multiple-unit trains are operated in multiple units, only one driver can operate on one locomotive, and each locomotive is electrically connected through a multi-core cable plug at both ends of the locomotive to achieve the operation of multiple locomotives by one driver. Therefore, for the normal operation of trains, it is very important to measure cable faults and locate faults.

[0065] Figure 1A It is a schematic structural diagram of the cable detection system provided in Embodiment 1 of the present invention. As Figure 1A shown, the cable detection system provided in this embodiment includes: a power unit 1 and a power unit 2, and at least one cable 3 connected between the two power units.

[0066] Each power unit respectively includes a gateway unit and a detection unit, and the cable is connected between the two gateway units through each detection unit.

[0067] As shown Figure 1A in the figure, the power unit 1 includes a gateway unit 1-2 and a detection unit 1-1, the power unit 2 includes a gateway unit 2-2 and a detection unit 2-1, and the cable 3 is connected between the gateway unit 1-2 and the gateway unit 2-2 through the detection unit 1-1 and the detection unit 2-1.

[0068] Each detection unit is respectively used to disconnect the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is used to send a detection signal to another detection unit through the cable, or to receive a detection signal through the cable.

[0069] Specifically, during the operation of the train, the first car in the forward direction of the train is taken as the head, and correspondingly, the first car in the reverse direction of the train is taken as the tail. The train driver operates in the head car to control the train operation. In the embodiment of the present invention, the head car can be taken as the power unit 1 and the tail car can be taken as the power unit 2 for illustration. Of course, in actual applications, the head car can also be taken as the power unit 2 and the tail car can be taken as the power unit 1. The specific positions of the power unit 1 and the power unit 2 are not limited in the embodiment of the present invention.

[0070] In order to realize the communication between the head and the tail of the train, usually a cable is used to connect the head and the tail. Among them, there are multiple trailer cars (such as Figure 1A 4 in the figure) between the head and the tail. At present, most heavy-haul locomotives adopt the WTB technology to realize the train-level communication of the heavy-haul locomotive, which can realize the transmission of process data and message data of the coupled train. Its biggest feature is that it has the function of initial train operation, can automatically address the vehicles, and form a new train topology structure without human participation.

[0071] A gateway is also called an internetwork connector or protocol converter. A gateway is the most complex network interconnection device, and most of them run at the application layer and are only used for the network interconnection of two different high-level protocol networks at the transport layer. A gateway can be used for both wide area network interconnection and local area network interconnection. For heterogeneous networks, due to the different communication standards adopted, the gateway acts as a converter and is used between two systems with completely different communication protocols, data formats or languages, and even architectures. The gateway not only needs to transmit information, but also needs to repackage the received information to meet the data format requirements of the target system.

[0072] Generally, within a single power unit vehicle, data communication between devices is carried out via a Multifunction Vehicle Bus (MVB) or Ethernet, which is called a vehicle network; while data communication between power units is achieved through a WTB network to realize data communication between vehicles, which is called a train-level network. Therefore, to achieve data communication between the train-level WTB network and the vehicle-level network of the power unit, it is necessary to convert the data packets of each other, that is, access the WTB data packet to the vehicle-level network through a gateway unit to realize train multiple unit operation.

[0073] When detecting the cable 3, after receiving the detection instruction, the detection unit 1-1 and the detection unit 2-1 respectively disconnect the switches between the gateway units connected to the detection units to disconnect the electrical connection between the detection units and the gateway units. The detection unit 1-1 disconnects the electrical connection with the gateway unit 1-2, and the detection unit 2-1 disconnects the electrical connection with the gateway unit 2-2. In this way, during the detection, only the electrical connection between the detection unit and the cable is made to measure the cable parameters, and at the same time, the disassembly process of the cable is avoided.

[0074] The detection unit 1-1 sends a detection signal to the detection unit 2-1 through the cable 3. After receiving the detection signal sent by the detection unit 1-1, the detection unit 2-1 will send a feedback signal to the detection unit 1-1 through the cable 3. The detection unit 1-1 receives the feedback signal sent by the detection unit 2-1 through the cable 3 and starts to jointly detect the cable 3 with the detection unit 2-1. Specifically, the detection unit 1-1 sends a sine wave or square wave signal, which is transmitted to the detection unit 2-1 through the cable 3. According to the waveform state reflected by the detection unit 2-1 through the cable 3, the cable state is analyzed to complete the measurement of the cable technical parameters.

[0075] The cable detection system provided by the present invention realizes the detection of the cable through two power units and the cable connected between the two power units. Among them, each power unit respectively includes a gateway unit and a detection unit. The cable is connected between the two gateway units through each detection unit. Each detection unit is respectively used to disconnect the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is used to send a detection signal to another detection unit through the cable or to receive a detection signal through the cable, realizing the detection of the cable parameters. Since the electrical connection between the cable and the corresponding gateway unit is disconnected when detecting the cable, the trouble of disassembling the cable during the detection process is avoided, and at the same time, the cable detection efficiency is improved.

[0076] In a possible implementation manner, the cable detection system provided by the present invention is based on Figure 1A on the basis of Figure 1BIt is a schematic structural diagram of the cable detection system provided in the second embodiment of the present invention, as Figure 1B shown.

[0077] Each power unit further includes a control unit. The power unit 1 further includes a control unit 1-3, and the control unit 1-3 is respectively connected to the corresponding gateway unit 1-2 and the detection unit 1-1; the power unit 2 further includes a control unit 2-3, and the control unit 2-3 is respectively connected to the corresponding gateway unit 2-2 and the detection unit 2-1. Among them, the control unit is used to control the detection unit to detect the parameters of the cable 3.

[0078] The present invention does not stipulate the hardware structure and principle of the control unit, as long as it is based on the corresponding component units of the existing conventional train network control system and can realize vehicle bus (WTB or Ethernet) communication.

[0079] Furthermore, each power unit further includes a human-machine interface unit. The power unit 1 includes a human-machine interface unit 1-4, and the human-machine interface unit 1-4 is connected to the corresponding control unit 1-3. The power unit 2 further includes a human-machine interface unit 2-4, and the human-machine interface unit 2-4 is connected to the corresponding control unit 2-3. Among them, the human-machine interface units 1-4 and 2-4 are used to output the detection results.

[0080] Specifically, the human-machine interface (Human Machine Interaction, HMI) is the medium and dialogue interface for transmitting and exchanging information between humans and computers, and is an important part of the computer system. The human-machine interface refers to the hard and soft contacts between humans and machines. This interface not only includes the direct contact of points, lines, and surfaces, but also includes the action space of remote information transmission and control. In the embodiment of the present invention, the human-machine interface unit is used to realize the display of the train state and the command interaction with the train system. For example, the user can click the detection button on the multi-touch human-machine interface to send a detection command to the control unit, so that the control unit controls the detection system to perform cable detection. In addition, after the detection unit detects the cable, the detection result will be output on the human-machine interface, such as displaying "the cable connection relationship is normal".

[0081] The present invention does not stipulate the hardware structure and principle of the human-machine interface unit, as long as it is based on the corresponding component units of the existing conventional train network control system and can realize vehicle bus (WTB or Ethernet) communication and command interaction.

[0082] Figure 2 For Figure 1A and Figure 1B the schematic structural diagram of the detection unit in Figure 2 shown, each detection unit respectively includes a power supply module, an interface module, a processor, and a bus interface group module.

[0083] Taking the detection unit 1-1 in the power unit 1 as an example, the detection unit 1-1 includes a power supply module 1-1-4, an interface module 1-1-3, a processor 1-1-2, and a bus interface group module 1-1-1.

[0084] Among them, the power supply module 1-1-4 is respectively connected to the interface module 1-1-3, the processor 1-1-2, and the bus interface group module 1-1-1. The power supply module 1-1-4 is used to supply power to the detection unit. The power supply module 1-1-4 can be charged by the train or composed of an independent battery pack.

[0085] The interface module 1-1-3 is respectively connected to the corresponding control unit 1-3 and the processor 1-1-2. The interface module 1-1-3 is used to receive the detection instructions sent by the control unit 1-3 and to receive the detection results sent by the processor 1-1-2.

[0086] The processor 1-1-2 is respectively connected to the interface module 1-1-3 and the bus interface group module 1-1-1. The processor 1-1-2 is used to control the transceiver of the detection signal.

[0087] Specifically, the processor 1-1-2 controls the transmission, reception, and digital processing of the detection signal. The processor 1-1-2 in the detection unit 1-1 receives the detection instruction sent by the control unit 1-3 through the interface module 1-1-3, emits the detection signal, and transmits it to the processor in the power unit 2 through the cable. After the processor in the power unit 2 receives the transmitted signal, it returns the signal to the processor 1-1-2 for processing, and analyzes the status of the cable 3 and completes the measurement of the technical parameters of the cable 3 according to the signal information reflected in the power unit 2.

[0088] The bus interface group module 1-1-1 is respectively connected to the processor 1-1-2 and the cable 3, and is used to connect the detection unit 1-1 to the bus to become an on-vehicle component unit.

[0089] It should be noted that the connection method and working principle of the power supply module, interface module, processor, and bus interface group module included in the detection unit 2-1 are similar to those of the power supply module, interface module, processor, and bus interface group module included in the detection unit 1-1, and will not be elaborated here.

[0090] Figure 3 is Figure 2 Schematic diagram of the bus interface group module structure.

[0091] The bus interface group module 1-1-1 includes at least one switching component. Each switching component includes a transceiver, a first switch, and a second switch. The first switch is located between the transceiver and the gateway unit in the power unit where the first switch is located, and the second switch is located between the transceiver and another power unit.

[0092] After receiving the encoded signal sent by the processor, the transceiver automatically forms a logic pulse signal of a certain width, sends the logic pulse signal to the cable under test, and at the same time, converts the return signal on the cable under test into a digital signal and sends it to the processor for analysis and processing.

[0093] The first switch is used to disconnect the electrical connection between the detection unit and the corresponding gateway unit before the test starts. The second switch is used to control the disconnection and connection between the transceiver and another power unit.

[0094] As Figure 3 shown, the bus interface group module 1-1-1 includes transceiver A1-1-1-5, transceiver B1-1-1-6, the first switch 1-1-1-1 of transceiver A1-1-1-5, the second switch 1-1-1-2 of transceiver A1-1-1-5, the first switch 1-1-1-3 of transceiver B1-1-1-6, and the second switch 1-1-1-4 of transceiver B1-1-1-6.

[0095] In the specific implementation process, usually there is more than one cable. Transceiver A and transceiver B respectively represent detecting data in different cables and detecting the parameters of two cables.

[0096] Taking transceiver A1-1-1-5 as an example, when the detection unit 1-1 in power unit 1 receives a detection instruction through interface module 1-1-3, it disconnects the electrical connection between detection unit 1-1 and gateway unit 1-2 through the first switch 1-1-1-1, and then sends a detection signal through processor 1-1-2. Transceiver A1-1-1-5 receives the detection signal sent by processor 1-1-2 and automatically forms a logic pulse signal of a certain width. This logic pulse signal is sent to the cable under test through transmitter 1-1-2. It is transmitted through the cable under test to detection unit 2-1 in power unit 2. Detection unit 2-1 receives the detection signal through the transceiver, sends it to the processor for processing, then returns the signal, and then transmits it through the cable to transceiver A1-1-1-5 in power unit 1. Transceiver A1-1-1-5 receives the signal and converts it into a digital signal and sends it to processor 1-1-2 for analysis and processing. After processor 1-1-2 processes and analyzes, it transmits the cable detection result to control unit 1-3 through interface module 1-1-3 and displays it on human-machine interface unit 1-4 through control unit 1-3.

[0097] Figure 4 is a schematic diagram of the panel interface of the cable detection system. The detection unit includes at least Figure 4 the interfaces shown in. Taking detection unit 1-1 as an example below, its interface group will be introduced.

[0098] AsFigure 4 As shown, A1 corresponds to Figure 3 the cable interface of cable A in the direction of the gateway unit 1-2, and A2 corresponds to Figure 3 the cable interface of cable A in the direction of the detection unit 2-1; B1 corresponds to Figure 3 the interface of cable B in the direction of the gateway unit 1-2, and B2 corresponds to Figure 3 the cable interface of cable B in the direction of the detection unit 2-1; ETH is the vehicle Ethernet communication interface for communicating with the control unit; PWR is the power interface. Optionally, the cables in the above embodiments are the Wired Train Bus (WTB).

[0099] Among them, the Wired Train Bus (WTB) is a bus standard defined by the train communication network standard for realizing data communication between marshaled vehicles. WTB can meet the needs of train real-time control, diagnosis, and passenger information systems. More importantly, WTB fully considers the situation of dynamic changes in train formation, and can adapt to the requirements of frequent changes in train formation during daily operations, as well as the requirements of interconnection and interoperability of vehicles manufactured by different manufacturers.

[0100] Optionally, the parameters of the cables detected by the detection unit in the above embodiments may include at least one of the following information: the connection relationship of the cables, whether the cables are short-circuited, the length information of the cables, the average characteristic impedance of the cables, the attenuation value of the cables, the return loss of the cables, and the location of abnormal points of the cables.

[0101] Furthermore, it is worth noting that the control unit, the human-machine interface unit, and the detection unit in the above embodiments can communicate instructions through Ethernet, using the User Datagram Protocol (UDP). Except for the communication message function, the Ethernet communication parameters such as the Socket port and the Internet Protocol (IP) address are not specified.

[0102] In addition, the above communication method can adopt the master-slave method of asking and answering, that is, the control unit and the human-machine interface unit send out the start test instruction, and after the detection unit receives this instruction, it conducts cable detection, and after the detection is completed, it sends out the detection result response.

[0103] Optionally, when detecting the cables, the UDP message instruction content sent by the control unit and the human-machine interface unit to the cable detection device of this section of the train includes:

[0104] Data length: indicating the length of the data message;

[0105] Measurement method: including the detailed test method and the quick test method;

[0106] Measurement attribute: including whether the cable test device acts as the master device or the slave device during the measurement.

[0107] Among them, there are quick test and detailed test instructions. The quick test instruction refers to quickly detecting the cable parameters, and the detection content is relatively simple. For example, diagnosing the connection relationship of the cable, whether there is a short circuit, and whether there is an open circuit. The detailed test instruction refers to detailed detection of the cable parameters, and the detection content is relatively rich. For example, measuring the cable length, average characteristic impedance, attenuation value, return loss, etc., and diagnosing the connection relationship of the cable, whether there is a short circuit, whether there is an open circuit, the position of the abnormal point, etc. The staff can select according to actual needs on the human-machine interface. After the cable detection is completed, the content of the UDP packet fed back by the detection unit for the measurement result may include the following:

[0108] Data length: Indicates the length of the data packet;

[0109] Wiring diagram information: Characterizes the connection relationship of each pin of the WTB;

[0110] Line A information: Includes the length of Line A, the type of abnormal point on Line A, the impedance attenuation of Line A, and the return loss;

[0111] Line B information: Includes the length of Line B, the type of abnormal point on Line B, the impedance attenuation of Line B, and the return loss;

[0112] After the control unit receives the feedback packet from the cable detection device, it can feed back the detection result to the human-machine interface unit for display.

[0113] The cable detection system provided by the present invention realizes the detection of the cable through two power units and the cable connected between the two power units. Each power unit respectively includes a gateway unit, a detection unit, a human-machine interface unit, and a control unit. The human-machine interface unit is used to display the detection result, and the control unit is used to control the detection unit to detect the cable parameters. The cable is connected between the two gateway units through each detection unit. Each detection unit is respectively used to disconnect the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is used to send a detection signal to another detection unit through the cable, or to receive a detection signal through the cable, realizing the detection of the cable parameters. Since each detection unit disconnects the electrical connection between the cable and the corresponding gateway unit when detecting the cable, it avoids the trouble of disassembling the cable during the detection process and improves the cable detection efficiency.

[0114] Figure 5 is the flow schematic diagram of Embodiment 1 of the cable detection method provided by the embodiment of the present invention, Figure 6 is the test flow schematic diagram of Embodiment 1 of the cable detection method provided by the embodiment of the present invention. Combining Figure 5 and Figure 6 , the embodiment of the present invention specifically includes the following steps:

[0115] Step 101: Receive the detection instruction sent by the user.

[0116] Among them, the detection instruction is used to instruct the first detection unit to detect the parameters of the cable. The first car in the forward direction of the train is the master control car, and the first car in the reverse direction of the train's forward direction is the slave control car. The driver controls the vehicle operation in the master control car. The control unit and the human-machine interface unit in the train jointly constitute the Train Control and Management System (TCMS). In the embodiment of the present invention, the first detection unit may be the detection unit of the master control car.

[0117] The user sends a detection instruction to the train network control system of the master control car by touching the detection control on the display screen of the human-machine interface unit of the master control car or pressing the detection button. As Figure 6 shown in step a, the train network control system TCMS of the master control car sends an instruction to start the test preparation to the gateway unit of this vehicle through the vehicle bus; as Figure 6 shown in step b, the gateway unit of the master control car forwards this instruction to the gateway unit of the slave control car through the WTB train bus; as Figure 6 shown in step c, the gateway unit of the slave control car sends this instruction to the TCMS of the slave control car through the cable; as Figure 6 shown in step d, after receiving the instruction to start the test preparation, the TCMS of the slave control car sends a signal indicating that the test preparation of the slave control car is completed to the gateway unit of this car through the vehicle bus; as Figure 6 shown in step e, the gateway unit of the slave control car sends the instruction that the test preparation of the slave control car is completed to the gateway unit of the master control car through the WTB train bus.

[0118] Step 102: According to the detection instruction, disconnect the electrical connection between the cable and the gateway unit, and send a detection signal to the second detection unit through the cable.

[0119] The first detection unit and the second detection unit are located in different power units. In the embodiment of the present invention, the second detection unit may be the detection unit of the slave control car.

[0120] As Figure 6 shown in step f, the TCMS of the slave control car sends a start test instruction to the detection unit of the slave control car through the Ethernet bus. After receiving the UDP packet instruction sent by the TCMS of the slave control car, first, the detection unit of the slave control car disconnects the electrical connection between the detection unit of the slave control car and the gateway unit of the slave control car, and starts to wait for the cable detection signal sent by the detection unit of the master control car. As Figure 6 shown in step g, the gateway unit of the master control car sends the signal that the test preparation of the slave control car is completed to the TCMS of the master control car through the vehicle bus.

[0121] As Figure 6 shown in step h, the master vehicle TCMS sends a start test instruction to the master vehicle detection unit via the Ethernet bus, indicating that this detection unit will serve as the host sending device for this measurement. After receiving the UDP message instruction, this detection unit first disconnects the electrical connection between the master vehicle detection unit and the master vehicle gateway unit, and starts to send detection signals to jointly complete the cable detection with the slave vehicle detection unit.

[0122] Step 103: Receive the detection result of the parameters of the cable returned by the second detection unit.

[0123] As Figure 6 shown in step i, after the master vehicle detection unit completes the cable detection, it sends the detection result to the TCMS system, and the TCMS system displays the detection result on the human-machine interface.

[0124] During the detection process, the cable detection devices at both ends are electrically isolated from the gateway devices on both sides through the line on-off switch, so that the cable measurement is completed under the condition of power-off.

[0125] Among them, the parameters of the cable include at least one of the following information: the connection relationship of the cable, whether the cable is short-circuited, the length information of the cable, the average characteristic impedance of the cable, the attenuation value of the cable, the return loss of the cable, the location of the abnormal point of the cable.

[0126] The cable detection method provided by the embodiment of the present invention receives a detection instruction sent by a user, and this detection instruction is used to instruct the first detection unit to detect the parameters of the cable. Then, according to the detection instruction, the electrical connection between the cable and the gateway unit is disconnected, and a detection signal is sent to the second detection unit through the cable. Among them, the first detection unit and the second detection unit are located in different power units. Finally, the detection result of the parameters of the cable returned by the second detection unit is received. Since the electrical connection between the cable and the corresponding gateway unit is disconnected after receiving the detection instruction, and then the cable detection is carried out, the cable can be detected without disassembling the cable, thereby improving the detection efficiency of the cable.

[0127] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cable detection system, characterized in that, Comprising: Two power units, and at least one cable connected between the two power units; Each of the power units respectively includes a gateway unit, a detection unit and a control unit. The cable is connected between the two gateway units through each of the detection units; each of the control units is respectively connected to the corresponding gateway unit and the corresponding detection unit; the control unit is configured to control the detection unit to detect the parameters of the cable; Each of the detection units is respectively configured to disconnect the electrical connection between the cable and the corresponding gateway unit when detecting the cable, and the detection unit is configured to send a detection signal to another detection unit through the cable and receive a feedback signal sent by the other detection unit, or is configured to receive the detection signal sent by the other detection unit through the cable and send a feedback signal to the other detection unit; The detection unit includes an interface module, a processor and a bus interface group module; The interface module is respectively connected to the corresponding control unit and the processor. The interface module is configured to receive a detection instruction sent by the control unit and to receive a detection result sent by the processor; The processor is respectively connected to the interface module and the bus interface group module. The processor is configured to control the transceiver of the detection signal, and when receiving the feedback signal, process the feedback signal to obtain the detection result; The bus interface group module is respectively connected to the processor and the cable; The bus interface group module includes at least one switching component. Each switching component includes a transceiver, a first switch and a second switch. The first switch is located between the transceiver and the gateway unit in the power unit where the first switch is located, and the second switch is located between the transceiver and another power unit; The first switch is configured to disconnect the electrical connection between the detection unit and the corresponding gateway unit before detecting the cable; the second switch is configured to control the electrical connection between the transceiver and the other power unit.

2. The system according to claim 1, wherein Each of the power units further includes a human-machine interface unit. Each of the human-machine interface units is respectively connected to the corresponding control unit. The human-machine interface unit is configured to output the detection result.

3. The system according to claim 2, wherein Each of the detection units further includes a power supply module; The power supply module is respectively connected to the interface module, the processor and the bus interface group module. The power supply module is configured to supply power to the detection unit.

4. The system according to any one of claims 1-3, characterized in that, The cable is a Wired Train Bus (WTB).

5. The system according to claim 1, wherein The parameters of the cable include at least one of the following information: the connection relationship of the cable, whether the cable is short-circuited, the length information of the cable, the average characteristic impedance of the cable, the attenuation value of the cable, the return loss of the cable, the position of the abnormal point of the cable.

6. A cable detection method, characterized in that, A detection unit applied to the cable detection system according to any one of claims 1 to 5, comprising: Receiving a detection instruction sent by a user through the interface module. The detection instruction is used to instruct the first detection unit to detect the parameters of the cable; According to the detection instruction, disconnect the electrical connection between the cable and the gateway unit through the first switch of the switch, and transmit a detection signal through the processor. The detection signal is transmitted to another detection unit through the cable; the first detection unit and the other detection unit are located in different power units; Receive the feedback signal returned by the other detection unit through the processor and obtain the detection result of the parameters of the cable based on the feedback signal.

7. The method according to claim 6, wherein The method further includes: Output the detection result through the human-machine interface unit.

8. The method according to claim 6 or 7, characterized in that, The parameters of the cable include at least one of the following information: the connection relationship of the cable, whether the cable is short-circuited, the length information of the cable, the average characteristic impedance of the cable, the attenuation value of the cable, the return loss of the cable, the position of the abnormal point of the cable.

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