Communication network segment channel testing device for motor train unit network

Abstract

A communication network segment channel testing device for a motor train unit network is composed of an MVB vehicle bus plug DB9 connector, an Ethernet plug M12 connector and a channel line switch testing circuit, and the MVB vehicle bus plug DB9 connector comprises a DB9 connector male head and a DB9 connector female head; the Ethernet plug M12 connector comprises an M12 connector male head and an M12 connector female head, and the channel line switch test circuit comprises a ship-shaped switch, a banana test jack, a connecting wire, a terminal and an attachable rheostat. The impedance and voltage values of a channel A / B path of an MVB vehicle bus network segment or a WTB train bus network segment of a TCN network are measured, the impedance and voltage values of a channel A / B path of an Ethernet ETB train-level bus network segment and an ECN vehicle-level bus network segment are measured, meanwhile, the network segment voltage can be measured through a test jack when a vehicle is powered on, and the measurement accuracy is improved. And the accuracy and efficiency of fault analysis and judgment are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail vehicle control circuits, and in particular relates to a device for measuring and simulating impedance values ​​of a channel of a TCN network communication segment of a train set. Background Art

[0002] CRH380B(C) and CR400BF series trains use TCN network communication or Ethernet communication structure to control the network of the whole vehicle. Each communication bus is divided into two channels, A / B, and each channel consists of two communication lines. In the operation of the train, the communication channel in the network segment is occasionally interrupted, or the failure of one of the network communication devices affects the signals of other network communication devices, causing the vehicle to flash multiple network communication module communication failures. The initial fault processing can only be done when the vehicle is powered off by removing the MVB plug or Ethernet plug of the network communication device node in the network segment and measuring the A / B impedance of the communication device channel at both ends of the node. This device can be used to measure and simulate the conduction performance of the TCN network or Ethernet network communication channel when the vehicle is powered on or off, thereby improving the judgment and analysis efficiency of network segment communication failures and the accuracy of fault judgment. Utility Model Content

[0003] The purpose of the utility model is to provide a channel testing device for a network communication segment of an EMU. The device can measure the impedance value and voltage value of the channel A / B of the MVB vehicle bus segment of the TCN network or the WTB train bus segment, and the impedance value and voltage value of the channel A / B of the ECN vehicle-level bus segment of the Ethernet network or the ETB train-level bus segment when the vehicle is powered or not, and at the same time, a variable resistor can be installed at the test jack to simulate the influence of the channel impedance on the network communication, and the location of the fault and the state of the network device can be confirmed by comparing the recorded values.

[0004] In order to achieve the above-mentioned utility model object, the utility model provides a channel test device for a network communication segment of a train group, characterized in that it is composed of an MVB vehicle bus plug DB9 connector, an Ethernet plug M12 connector, and a channel line switch test circuit, wherein:

[0005] The MVB vehicle bus plug DB9 connector includes a DB9 connector male head and a DB9 connector female head; select the corresponding network communication device connection node in the MVB vehicle bus segment or WTB train bus segment of the TCN network, remove the MVB plug on the node, and insert the male and female heads of the MVB plug connector on the test device into the MVB vehicle bus plug DB9 connector on the test device according to the position of the male and female heads of the MVB plug connector on the segment node. The device is connected in series to the segment without affecting the TCN network communication segment.

[0006] The Ethernet plug M12 connector includes an M12 connector male head and an M12 connector female head; a corresponding network communication device connection node is selected from the ETB train-level bus or ECN vehicle-level bus segment of the Ethernet communication network, the Ethernet plug on the node is removed, and the Ethernet plug M12 connector on the test device is correspondingly inserted according to the position of the male and female heads of the Ethernet plug connector on the segment node, and the device is connected in series to the segment without affecting the Ethernet network communication segment;

[0007] The channel line switch test circuit includes 4 rocker switches, 8 banana test jacks, connecting wires, terminals and attachable rheostats. The TCN communication network is divided into a vehicle MVB vehicle bus segment and a WTB train bus segment, and each segment is divided into two A / B channels. The Ethernet network is divided into an ETB train-level bus segment and an ECN vehicle-level bus segment, and each segment is divided into two A / B channels. Each channel consists of two communication lines, a total of 4 lines. A rocker switch is connected between the two banana test jacks of each line. Rheostats can be added to the banana test jacks at both ends of any communication line, and the influence of the rheostat simulation channel impedance on network communication can be adjusted;

[0008] The male DB9 connector and the female DB9 connector of the MVB vehicle bus plug DB9 connector are connected to the terminals of the banana test jacks of the corresponding line channel in sequence, and the male M12 connector and the female M12 connector of the Ethernet plug M12 connector are connected to the terminals of the banana test jacks of the corresponding line channel in sequence. The on and off state of the corresponding MVB communication network segment channel line can be controlled by the boat-shaped switch. When there is no power, the switch is disconnected to segment the communication channel, and the impedance at both ends of the network segment is measured through the test jacks at both ends of the switch; when there is power, the switch is disconnected to segment the communication channel, and the voltage at both ends of the network segment is measured through the test jacks at both ends of the switch.

[0009] Furthermore, pin 1 and pin 3 of the M12 male connector and the M12 female connector are connected to channel A of the bus segment, and pin 2 and pin 4 of the M12 male connector and the M12 female connector are connected to channel B of the bus segment.

[0010] Furthermore, pins 1 and 2 of the DB9 male connector and the DB9 female connector are connected to channel A of the bus segment, and pins 4 and 5 of the DB9 male connector and the DB9 female connector are connected to channel B of the bus segment.

[0011] The advantages and progress of the utility model over the background technology are as follows:

[0012] CRH380B(C) and CR400BF series trains use TCN network communication or Ethernet communication structure to control the network of the whole vehicle. TCN network is divided into WTB train bus communication and MVB vehicle bus communication, and Ethernet communication is divided into ETB train-level bus communication and ECN vehicle-level bus communication. When a communication failure occurs in any communication bus segment, the impedance of the segment channel can only be measured in a static state without power, and the communication voltage cannot be measured in a powered state, and the line state change of the communication channel cannot be monitored online. Therefore, a channel test device for the network communication segment of the EMU is designed and manufactured, which can measure the impedance and voltage value of the channel A / B of the MVB vehicle bus segment or the WTB train bus segment of the TCN network, and the impedance and voltage value of the channel A / B of the Ethernet ETB train-level bus segment and the ECN vehicle-level bus segment when the vehicle is powered or not. The advantages are as follows:

[0013] To match the vehicle network bus plug, the device uses a DB9 type connector that matches the male and female heads of the vehicle's TCN network communication segment, and a plug M12 connector that matches the male and female heads of the Ethernet communication segment. The test device can be effectively and stably connected in series to the communication segment.

[0014] The communication network segment device line is measured for impedance without resistance and voltage with power. In the early stage, the impedance of the network segment channel could only be measured by removing the communication plug in a non-powered and static state and measuring the impedance at both ends. This device can be directly connected in series to the network segment, which can meet the requirements of measuring the communication impedance at both ends of the network segment when there is no power. At the same time, it can also meet the requirements of measuring the network segment voltage through the test jack when the vehicle is powered, thereby improving the accuracy and efficiency of fault analysis and judgment.

[0015] A line impedance simulation interface is added, and a rheostat can be connected to the test jacks at both ends of each communication line on the device. By adjusting the rheostat, the interference effect of impedance on the quality of the network communication line can be simulated, thereby improving the efficiency of fault analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the internal circuit of the EMU network communication segment channel test device.

[0017] The figure includes: 1-a first rocker switch; 2-a second rocker switch; 3-a third rocker switch; 4-a fourth rocker switch; 5-a female M12 connector; 6-a male M12 connector; 7-a female DB9 connector; 8-a male DB9 connector; 9-a rheostat; banana test jacks 1-2 and 1-1 on both sides of the first rocker switch; banana test jacks 2-2 and 2-1 on both sides of the second rocker switch; banana test jacks 3-1 and 3-2 on both sides of the third rocker switch; banana test jacks 4-1 and 4-2 on both sides of the fourth rocker switch. DETAILED DESCRIPTION

[0018] In order to better understand the purpose, structure and function of the utility model, the following is a detailed description of the embodiment of the utility model for a TCN network communication segment channel test device for a EMU in conjunction with the accompanying drawings, which is also applicable to the embodiment of the EMU Ethernet network communication segment channel test device.

[0019] Reference Figure 1 The EMU TCN network communication segment channel test device includes an MVB vehicle bus plug DB9 connector, an Ethernet plug M12 connector, and a channel line switch test circuit. The MVB vehicle bus plug DB9 connector includes a DB9 connector male head 8 and a DB9 connector female head 7. The DB9 connector male head 8 and the DB9 connector female head 7 are used to match the vehicle MVB vehicle bus segment or the WTB train bus segment, so as to facilitate direct serial connection to the relevant segment, and connect the terminal pin positions marked on the MVB vehicle bus plug DB9 connector to the terminals of the corresponding test jacks.

[0020] The Ethernet plug M12 connector includes an M12 connector male head 6 and an M12 connector female head 5; the M12 connector male head 6 and the M12 connector female head 5 are used to match and access the ETB train-level bus segment or the ECN vehicle-level bus segment, so as to facilitate direct serial access to the relevant segment and connect the terminal pin positions marked on the Ethernet plug M12 connector to the terminals of the corresponding test jacks.

[0021] The channel line switch test circuit includes 4 rocker switches, 8 banana test jacks, connecting wires, terminals and an attachable variable resistor 9. The TCN network communication or Ethernet communication bus is divided into two A / B routes, each route consists of two communication lines, a total of 4 lines. The pins on the DB9 male connector 8 and the DB9 female connector 7 are sequentially connected to the banana test jacks of the corresponding line channels, and the pins on the M12 male connector 6 and the M12 female connector 5 are sequentially connected to the banana test jacks of the corresponding line channels. A rocker switch is connected between the two banana test jacks of each line. The rocker switch can control the on and off of the corresponding MVB communication network segment channel line state. The specific wiring method is as follows:

[0022] 1. Wiring of TCN network DB9 connector male 8:

[0023] (1) Channel A: Connect pin 1 to the banana test jack 1-2 position, and connect pin 2 to the banana test jack 2-2 position;

[0024] (2) Channel B: Connect pin 4 to the banana test jack 3-2, and pin 5 to the banana test jack 4-2;

[0025] 2. Wiring of TCN network DB9 connector female 7:

[0026] (1) Channel A: Connect pin 1 to banana test jack position 1-1, and connect pin 2 to banana test jack position 2-1;

[0027] (2) Channel B: Connect pin 4 to the banana test jack 3-1, and connect pin 5 to the banana test jack 4-1.

[0028] 3. Wiring of Ethernet network M12 connector male 6:

[0029] (1) Channel A: Connect pin 1 to the banana test jack 1-2 position, and connect pin 3 to the banana test jack 2-2 position;

[0030] (2) Channel B: Connect pin 2 to the banana test jack 3-2, and connect pin 4 to the banana test jack 4-2.

[0031] 4. Wiring of Ethernet network M12 connector female 5:

[0032] (1) Channel A: Connect pin 1 to banana test jack 1-1, and connect pin 3 to banana test jack 2-1.

[0033] (2) Channel B: Connect pin 2 to banana test jack position 3-1, and connect pin 4 to banana test jack position 4-1;

[0034] 5. Circuit switch wiring:

[0035] (1) The lead wire of banana test jack 1-1 is connected to one end of the first rocker switch 1, and the other end of the first rocker switch 1 is connected to the position of banana test jack 1-2.

[0036] (2) The lead wire of banana test jack 2-1 is connected to one end of the second rocker switch 2, and the other end of the second rocker switch 2 is connected to the position of banana test jack 2-2.

[0037] (3) The lead wire of the banana test jack 3-1 is connected to one end of the third rocker switch 3, and the other end of the third rocker switch 3 is connected to the banana test jack 3-2.

[0038] (4) The lead wire of banana test socket 4-1 is connected to one end of the fourth rocker switch 4, and the other end of the fourth rocker switch 4 is connected to the position of banana test socket 4-2.

[0039] At the same time, a variable resistor 9 can be added to the banana test jacks at both ends of any communication line. The wiring method is as follows:

[0040] The lead wire of the banana test jack 1-1 is connected to one end of the variable resistor 9, and the other end of the variable resistor 9 is connected to the banana test jack 1-2 position.

[0041] The TCN communication network is divided into vehicle MVB vehicle bus segment and WTB train bus segment. Each segment is divided into two channels A / B. Pins 1 and 2 of DB9 connector male head 8 and DB9 connector female head 7 are channel A, and pins 4 and 5 of DB9 connector male head 8 and DB9 connector female head 7 are channel B. Similarly, the Ethernet network is divided into ETB train-level bus and ECN vehicle-level bus segments. Each segment is divided into two channels A / B. Pins 1 and 3 of M12 connector male head 6 and M12 connector female head 5 are channel A, and pins 2 and 4 of M12 connector male head 6 and M12 connector female head 5 are channel B.

[0042] Because the device has an MVB vehicle bus plug DB9 connector and an Ethernet plug M12 connector, due to different wiring states on the junction box, it can be used on the TCN bus (MVB / WTB bus) and the Ethernet bus (ETB / ECN bus).

[0043] The test device is connected in series to any TCN network or Ethernet network segment module device connection node. The segment channel can be segmented by disconnecting the channel line switch on the device. When the vehicle is out of power, the impedance value of the channel at both ends can be measured through the test jacks at both ends; when the vehicle is powered, the voltage value of the channel at both ends can be measured through the test jacks at both ends, which is convenient for comparing and monitoring the resistance value and voltage of the fault line. At the same time, a rheostat 9 can be installed at the test jack position at both ends of any channel line of the device. When the test switch is disconnected, the influence of the change of channel impedance on network communication can be simulated by adjusting the resistance value of the rheostat.

[0044] The MVB / WTB bus is divided into two redundant paths, A / B, and the Ethernet bus is divided into two paths, TX / RX (transmit / receive). For ease of understanding, the TX path is also described as path A and the RX path is described as path B.

Claims

1. A device for testing a network communication segment channel of a train unit, characterized in that: It is composed of an MVB vehicle bus plug DB9 connector, an Ethernet plug M12 connector and a channel line switch test circuit, wherein: the MVB vehicle bus plug DB9 connector includes a DB9 connector male head and a DB9 connector female head; select a corresponding network communication device connection node in the MVB vehicle bus segment or WTB train bus segment of the TCN network, remove the MVB plug on the node, and insert the male and female heads of the MVB plug connector on the test device into the MVB vehicle bus plug DB9 connector on the test device according to the position of the male and female heads of the MVB plug connector on the segment node, and the device is connected in series to the segment without affecting the TCN network communication segment; The Ethernet plug M12 connector includes an M12 connector male head and an M12 connector female head; a corresponding network communication device connection node is selected from the ETB train-level bus or ECN vehicle-level bus segment of the Ethernet communication network, the Ethernet plug on the node is removed, and the Ethernet plug M12 connector on the test device is correspondingly inserted according to the position of the male and female heads of the Ethernet plug connector on the segment node, and the device is connected in series to the segment without affecting the Ethernet network communication segment; The channel line switch test circuit includes 4 rocker switches, 8 banana test jacks, connecting wires, terminals and an attachable rheostat. The TCN communication network is divided into a vehicle MVB vehicle bus segment and a WTB train bus segment, and each segment is divided into two A / B channels. The Ethernet network is divided into an ETB train-level bus segment and an ECN vehicle-level bus segment, and each segment is divided into two A / B channels. Each channel consists of two communication lines, a total of 4 lines. A rocker switch is connected between the two banana test jacks of each line, and a rheostat can be added to the banana test jacks at both ends of any communication line. The male DB9 connector and the female DB9 connector of the MVB vehicle bus plug DB9 connector are connected to the terminals of the banana test jacks of the corresponding line channel in sequence, and the male M12 connector and the female M12 connector of the Ethernet plug M12 connector are connected to the terminals of the banana test jacks of the corresponding line channel in sequence. The on and off state of the corresponding MVB communication network segment channel line can be controlled by the boat-shaped switch. When there is no power, the switch is disconnected to segment the communication channel, and the impedance at both ends of the network segment is measured through the test jacks at both ends of the switch; when there is power, the switch is disconnected to segment the communication channel, and the voltage at both ends of the network segment is measured through the test jacks at both ends of the switch.

2. The device for testing a network communication segment channel of a train set according to claim 1, characterized in that: Pins 1 and 3 of the M12 male connector and the M12 female connector are connected to channel A of the bus segment, and pins 2 and 4 of the M12 male connector and the M12 female connector are connected to channel B of the bus segment.

3. The device for testing a network communication segment channel of a train set according to claim 1, characterized in that: Pins 1 and 2 of the DB9 male connector and the DB9 female connector are connected to channel A of the bus segment, and pins 4 and 5 of the DB9 male connector and the DB9 female connector are connected to channel B of the bus segment.

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