Testing equipment for rail transit vehicle-mounted signal equipment
By introducing FPGA modules and multiple signal output modules into the rail transit vehicle signal equipment test equipment, the problem of low credibility in the test results in the prior art is solved, a more reliable hardware testing environment is realized, and the test results are improved credibility.
Patent Information
- Application Number
- CN202420526508.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-19
AI Technical Summary
In the prior art, the test results of rail transit vehicle-mounted signal equipment are not very credible, and there is a lack of testing methods to implement hardware, so it can only be tested on simulation and simulation software.
A rail transit vehicle-mounted signal equipment testing equipment is designed, including FPGA module and a variety of signal output modules, such as transponder signal output module, radar pulse signal output module, beacon signal output module, speed sensor pulse signal output module and MVB signal Output modules, through which test data is sent to the device, providing a specific hardware testing environment.
It improves the credibility of the test results of on-board signal equipment of rail transit and provides a more reliable hardware testing environment.
Smart Images
Figure CN222353993U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rail transit, in particular to a rail transit vehicle-mounted signal equipment testing device. Background Art
[0002] As an important part of the CBTC system, rail transit vehicle signal equipment (VOBC) is responsible for receiving and processing instructions from the base station and controlling vehicle operation. Rail transit vehicle signal equipment plays a vital role in the safe operation of trains. Therefore, it is necessary to conduct corresponding tests on rail transit vehicle signal equipment to ensure the safety and stable operation of urban rail transit. In the existing tests of rail transit vehicle signal equipment, most of them use pure software to simulate the output of test signals to obtain test results. However, this pure software simulation output test signal method lacks implementation hardware and can only be simulated on simulation software. The credibility of the obtained test results is not high. Utility Model Content
[0003] The purpose of the utility model is to overcome the shortcomings of the prior art in which the test results of rail transit vehicle signal equipment are obtained by pure software simulation output of test signals, which lacks implementation hardware and the credibility of the test results is not high. A rail transit vehicle signal equipment test device is provided, which provides a signal output module such as a transponder signal output module, a radar pulse signal output module, a beacon signal output module, a speed sensor pulse signal output module and an MVB signal output module, so that the test data forwarded in the FPGA module are sent to the rail transit vehicle signal equipment test device through different signal output modules, thereby providing specific implementation hardware for the test of the rail transit vehicle signal equipment and improving the credibility of the test results of the rail transit vehicle signal equipment.
[0004] The purpose of this utility model is achieved through the following technical solutions:
[0005] A rail transit vehicle signal equipment test device is arranged between the rail transit vehicle signal equipment under test and a test host computer, comprising an FPGA module, through which the test data sent by the test host computer is identified and forwarded to the rail transit vehicle signal equipment, and also comprising a transponder signal output module, a radar pulse signal output module, a beacon signal output module, a speed sensor pulse signal output module and an MVB signal output module, wherein the input ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the FPGA module, and the output ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the rail transit vehicle signal equipment under test through corresponding connectors.
[0006] Furthermore, the speed sensor pulse signal output module includes several pulse output ports, the input end of each pulse output port is connected to the FPGA module, and the output end of each pulse output port is connected to the speed sensor pulse signal output module through a corresponding connector. The first pulse output port and the second pulse output port are voltage-type speedometers or current-type speedometers, and each of the remaining pulse output ports are voltage-type speedometers.
[0007] Furthermore, it also includes a switching output module, which includes a solid-state relay, a first current limiting resistor and a shunt resistor. The positive electrode of the light-emitting diode at the input end of the solid-state relay is connected to the output end of the working power supply through the first current limiting resistor, the negative electrode of the light-emitting diode at the input end of the solid-state relay is connected to the FPGA module, and the output end of the solid-state relay is connected to the tested rail transit vehicle signal equipment through a corresponding connector. A shunt resistor is also connected in parallel between the positive and negative electrodes of the light-emitting diode at the input end of the solid-state relay.
[0008] Furthermore, the transponder signal output module includes a first optocoupler and a second current limiting resistor, the positive electrode of the light-emitting diode at the input end of the first optocoupler is connected to the working power supply output end through the second current limiting resistor, the negative electrode of the light-emitting diode at the input end of the first optocoupler is connected to the FPGA module, and the output end of the first optocoupler is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
[0009] Furthermore, the beacon signal output module includes a locking signal output unit and an intermediate frequency channel signal output unit, one end of the locking signal output unit is connected to the FPGA module through a first resistor, and the other end of the locking signal output unit is connected to the tested rail transit vehicle signal equipment, and the intermediate frequency channel signal output unit includes a first digital-to-analog converter, the control end of the first digital-to-analog converter is connected to the FPGA module, and the output end of the first digital-to-analog converter is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
[0010] Furthermore, the control end of the first digital-to-analog converter is connected to the FPGA module via an SPI interface.
[0011] Furthermore, it also includes a current loop acquisition module, which includes a second digital-to-analog converter, the input end of the second digital-to-analog converter is connected to the tested rail transit vehicle signal equipment, and the output end of the second digital-to-analog converter is connected to the FPGA module.
[0012] Furthermore, the output end of the digital-to-analog converter is connected to the FPGA module via an SPI interface.
[0013] The beneficial effects of the utility model are:
[0014] By setting up signal output modules such as the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module, the test data forwarded in the FPGA module is sent to the rail transit on-board signal equipment test equipment through different signal output modules, which provides specific implementation hardware for the test of the rail transit on-board signal equipment and can improve the credibility of the test results of the rail transit on-board signal equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of the utility model;
[0016] Figure 2 It is a circuit diagram of a single-channel pulse output port corresponding to a voltage-type speedometer according to an embodiment of the utility model;
[0017] Figure 3 It is a circuit diagram of a single-channel pulse output port corresponding to a current-type speedometer according to an embodiment of the utility model;
[0018] Figure 4 This is a circuit diagram of a switch output module according to an embodiment of the utility model;
[0019] Figure 5 It is a circuit diagram of a transponder signal output module of an embodiment of the utility model;
[0020] Figure 6 It is a complete structural block diagram of a rail transit vehicle-mounted signal equipment testing device according to an embodiment of the utility model.
[0021] Among them: 1. FPGA module, 2. Transponder signal output module, 3. Radar pulse signal output module, 4. Beacon signal output module, 5. Speed sensor pulse signal output module, 6. MVB signal output module, 7. Switch output module, 8. Current loop acquisition module, 9. Connector, 10. Reset input module, 11. Serial port conversion module, 12. Bus conditioning module. DETAILED DESCRIPTION
[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0023] Example:
[0024] A rail transit vehicle signal equipment test device is arranged between the rail transit vehicle signal equipment to be tested and a test host computer, such as Figure 1 As shown, it includes an FPGA module 1, which identifies and forwards the test data sent by the test host computer to the rail transit vehicle-mounted signal equipment through the FPGA module, and also includes a transponder signal output module 2, a radar pulse signal output module 3, a beacon signal output module 4, a speed sensor pulse signal output module 5 and an MVB signal output module 6. The input ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the FPGA module, and the output ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the tested rail transit vehicle-mounted signal equipment through the corresponding connector 9.
[0025] The FPGA module in this embodiment adopts the FPGA chip of ACTEL Company, and the connectors used in this embodiment are all CPCI connectors, specifically Type-A and Type-B22 connectors of Harting Company.
[0026] In order to improve the anti-interference ability and driving ability of the communication interface between the FPGA module and each communication output module, a Local Bus, i.e., a bus conditioning module, is also set up. The bus conditioning module includes 1 read signal line, 1 write signal line, 1 chip select signal line, 12 address buses and 16 data. One end of the bus conditioning module is connected to the tested rail transit vehicle signal equipment through a connector, and the other end of the bus conditioning module is connected to the FPGA module. The input and output signal levels at both ends of the bus conditioning module meet the 3.3V CMOS level standard requirements.
[0027] In order to improve the anti-interference capability of the bus, a 220-ohm resistor or resistor is connected in series between the bus conditioning module 12 and the connector, and a 0603 package is used. In this embodiment, a 74HC245 series bus driver chip is specifically used as the bus conditioning module.
[0028] The speed sensor pulse signal output module includes several pulse output ports, the input end of each pulse output port is connected to the FPGA module, and the output end of each pulse output port is connected to the speed sensor pulse signal output module through a corresponding connector. The first pulse output port and the second pulse output port are voltage-type speedometers or current-type speedometers, and each of the remaining pulse output ports are voltage-type speedometers.
[0029] The speed sensor is divided into a voltage type speedometer and a current type speedometer. In this embodiment, the speed sensor pulse signal output module outputs 12 pulses in total, of which the first and second pulses can be selected to be voltage type or current type, and the remaining pulses can only be voltage type.
[0030] The circuit diagram of the single pulse output port corresponding to the voltage type speedometer is as follows Figure 2 As shown, it includes an optical coupler OP1, a resistor R1 and a resistor R2, and Figure 2 The SPD_VCC and SPD_GND shown in the figure are the Doppler radar power supplies provided by the outside world, and the voltage is 15V.
[0031] The optocoupler OP1 used in this embodiment is of model SFH6135, with an optocoupler isolation voltage of 5000V, a maximum output voltage of 30V, a maximum output current of 16mA, a transmission rate of 1MBd, a resistor R1 being a current limiting resistor with a resistance value of 510 ohms, and a resistor R2 being an internal pull-up resistor with a resistance value of 333 ohms.
[0032] When the FPGA module outputs a high level, the optocoupler OP1 is not turned on, and the pulse output port SPD_CH1 outputs a high level; when the FPGA module outputs a low level, the optocoupler OP1 is turned on, and the pulse output port SPD_CH1 outputs a low level.
[0033] The circuit diagram of the single pulse output port corresponding to the current type speedometer is as follows Figure 3 As shown, it includes an optical coupler OP2, a resistor R3, a resistor R4, a MOS tube D1 and a current source U1. Similarly, Figure 3 The SPD_VCC and SPD_GND shown in the figure are the Doppler radar power supplies provided by the outside world, and the voltage is 15V.
[0034] The optocoupler OP2 used in this embodiment is of model TLP521, with an optocoupler isolation voltage of 2500V, a maximum collector-emitter voltage of 55V, and a maximum collector current of 50mA. Resistor R3 is a current-limiting resistor with a resistance of 4.7K ohms. MOS tube D1 is specifically a PMOS tube, model VP0610T, and a maximum drain current of 120mA. Current source U1 specifically uses a current source chip of model AD5422, and its output current range is 0-20mA. The FPGA module can control the current source U1 to output different current values through the SPI interface. When in normal use, the current source U1 needs to output a current of more than 10mA, and the FPGA module can control the pulse output of the pulse output port SPD_CH2 through the optocoupler OP2.
[0035] When the FPGA module outputs a high level, the optocoupler OP2 is not turned on, and the pulse output port SPD_CH2 outputs a low level; when the FPGA module outputs a low level, the optocoupler OP2 is turned on, and the pulse output port SPD_CH2 outputs a high level.
[0036] It also includes a switch output module 7, which includes a solid-state relay, a first current limiting resistor and a shunt resistor. The positive electrode of the light-emitting diode at the input end of the solid-state relay is connected to the output end of the working power supply through the first current limiting resistor, the negative electrode of the light-emitting diode at the input end of the solid-state relay is connected to the FPGA module, and the output end of the solid-state relay is connected to the tested rail transit vehicle signal equipment through a corresponding connector. A shunt resistor is also connected in parallel between the positive and negative electrodes of the light-emitting diode at the input end of the solid-state relay.
[0037] The switch output module can realize the output control function of 2-way 24V switch quantity. The circuit diagram of the switch output module is as follows: Figure 4 As shown, it includes a solid-state relay IC1, a first current limiting resistor R5 and a shunt resistor R6. When the FPGA module outputs a low level, the 3.3V power supply voltage is limited by the resistor R1, which can control the solid-state relay IC1 to be turned on.
[0038] In this embodiment, the model of the solid-state relay IC1 is PVG612, the isolation voltage is 4000V, and the maximum load current of the output end is 1A. The positive pole of the light-emitting diode at the input end of the solid-state relay IC1 is connected to the 3.3V power supply voltage, and the negative pole is connected to the FPGA module. The FPGA module outputs low and high levels to control the light-emitting diode on and off, thereby controlling the on and off of the output end of the solid-state relay IC1.
[0039] The transponder signal output module includes a first optocoupler and a second current-limiting resistor. The positive electrode of the light-emitting diode at the input end of the first optocoupler is connected to the working power supply output end through the second current-limiting resistor, the negative electrode of the light-emitting diode at the input end of the first optocoupler is connected to the FPGA module, and the output end of the first optocoupler is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
[0040] The transponder signal output module can realize the CD (caution) signal output of 2 BTMs (transponders), and the 2 CD signal outputs are isolated from each other.
[0041] The circuit diagram of the transponder signal output module is as follows: Figure 5 As shown, including a first optical coupler OP3, a second current limiting resistor R7, and Figure 5 CD1+ and CD1- shown in the figure are CD signals of the BTM, which are connected to the collector and emitter of the output end of the first optical coupler OP3 respectively.
[0042] In this embodiment, the model of the first optical coupler OP3 is TLP521, the optical coupler isolation voltage is 2500V, the maximum collector-emitter voltage is 55V, the maximum collector current is 50mA, and the resistance value of the second current limiting resistor R7 is set to 510 ohms.
[0043] When the FPGA module outputs a high level, the first optocoupler OP3 is not conducting, and CD1+ and CD1- are disconnected; when the FPGA module outputs a low level, the first optocoupler OP3 is conducting, and CD1+ and CD1- are conducting, and the CD signal of the BTM is output.
[0044] The beacon signal output module includes a locking signal output unit and an intermediate frequency channel signal output unit, one end of the locking signal output unit is connected to the FPGA module through a first resistor, and the other end of the locking signal output unit is connected to the tested rail transit vehicle signal equipment, and the intermediate frequency channel signal output unit includes a first digital-to-analog converter, a control end of the first digital-to-analog converter is connected to the FPGA module, and an output end of the first digital-to-analog converter is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
[0045] The control end of the first digital-to-analog converter is connected to the FPGA module via an SPI interface.
[0046] The beacon signal output module can realize the LOCK signal output of one beacon interrogator (TI) and the intermediate frequency channel signal (SIG) signal output of one beacon interrogator (TI), wherein the lock signal output unit is used to output the LOCK signal of one beacon interrogator (TI), and the intermediate frequency channel signal output unit is used to output the intermediate frequency channel signal (SIG) signal of one beacon interrogator (TI).
[0047] The LOCK signal is a TTL level signal, therefore, the LOCK signal can be directly output through the FPGA pin, and in order to improve the anti-interference performance of the signal, a first resistor is connected in series in the middle, and in this embodiment, the resistance value of the first resistor is set to 22 ohms.
[0048] The SIG signal is an analog modulation frequency signal representing the field strength signal of TI. Therefore, the FPGA module controls the first digital-to-analog converter in the intermediate frequency channel signal output unit through the SPI interface to output the SIG signal. In this embodiment, the first digital-to-analog converter uses a programmable voltage output chip model AD5422.
[0049] It also includes a current loop acquisition module 8, which includes a second digital-to-analog converter, the input end of the second digital-to-analog converter is connected to the tested rail transit vehicle signal equipment, and the output end of the second digital-to-analog converter is connected to the FPGA module.
[0050] The output end of the digital-to-analog converter is connected to the FPGA module via an SPI interface.
[0051] The MVB (Multi-function Vehicle Bus) signal output module uses a D013 module with a D013 communication chip as the main body to realize the output of MVB signals. The D013 module also needs to be connected to the test host computer through the Local Bus, which can both output and receive MVB signals.
[0052] In addition to the above signal output module, basic hardware modules such as reset input module 10 and serial port conversion module 11 are also provided, which can provide reset signal for FPGA module and ensure the safe operation of FPGA module. It can also provide serial port conversion function, through which 4 serial port signals can be converted into 2 RS422, 1 RS485 and 1 RS232, and the converted serial port signals can also be output through the connector.
[0053] Specifically, the complete structural block diagram of the rail transit vehicle signal equipment test equipment of this embodiment is as follows: Figure 6 shown.
[0054] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.
Claims
1. A rail transit vehicle signal equipment test device, arranged between the rail transit vehicle signal equipment to be tested and a test host computer, comprising an FPGA module, through which the FPGA module identifies and forwards the test data sent by the test host computer to the rail transit vehicle signal equipment, characterized in that: It also includes a transponder signal output module, a radar pulse signal output module, a beacon signal output module, a speed sensor pulse signal output module and an MVB signal output module. The input ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the FPGA module, and the output ends of the transponder signal output module, the radar pulse signal output module, the beacon signal output module, the speed sensor pulse signal output module and the MVB signal output module are all connected to the tested rail transit vehicle-mounted signal equipment through corresponding connectors.
2. A rail transit vehicle-mounted signal equipment testing device according to claim 1, characterized in that: The speed sensor pulse signal output module includes several pulse output ports, the input end of each pulse output port is connected to the FPGA module, and the output end of each pulse output port is connected to the speed sensor pulse signal output module through a corresponding connector. The first pulse output port and the second pulse output port are voltage-type speedometers or current-type speedometers, and each of the remaining pulse output ports are voltage-type speedometers.
3. The rail transit vehicle-mounted signal equipment testing device according to claim 1, characterized in that: It also includes a switching output module, which includes a solid-state relay, a first current limiting resistor and a shunt resistor. The positive electrode of the light-emitting diode at the input end of the solid-state relay is connected to the output end of the working power supply through the first current limiting resistor, the negative electrode of the light-emitting diode at the input end of the solid-state relay is connected to the FPGA module, and the output end of the solid-state relay is connected to the tested rail transit vehicle signal equipment through a corresponding connector. A shunt resistor is also connected in parallel between the positive and negative electrodes of the light-emitting diode at the input end of the solid-state relay.
4. A rail transit vehicle-mounted signal equipment testing device according to claim 1, characterized in that: The transponder signal output module includes a first optocoupler and a second current-limiting resistor. The positive electrode of the light-emitting diode at the input end of the first optocoupler is connected to the working power supply output end through the second current-limiting resistor, the negative electrode of the light-emitting diode at the input end of the first optocoupler is connected to the FPGA module, and the output end of the first optocoupler is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
5. The rail transit vehicle-mounted signal equipment testing device according to claim 1, characterized in that: The beacon signal output module includes a locking signal output unit and an intermediate frequency channel signal output unit, one end of the locking signal output unit is connected to the FPGA module through a first resistor, and the other end of the locking signal output unit is connected to the tested rail transit vehicle signal equipment, and the intermediate frequency channel signal output unit includes a first digital-to-analog converter, a control end of the first digital-to-analog converter is connected to the FPGA module, and an output end of the first digital-to-analog converter is connected to the tested rail transit vehicle signal equipment through a corresponding connector.
6. A rail transit vehicle-mounted signal equipment testing device according to claim 5, characterized in that: The control end of the first digital-to-analog converter is connected to the FPGA module via an SPI interface.
7. The rail transit vehicle-mounted signal equipment testing device according to claim 1, characterized in that: It also includes a current loop acquisition module, which includes a second digital-to-analog converter. The input end of the second digital-to-analog converter is connected to the tested rail transit vehicle signal equipment, and the output end of the second digital-to-analog converter is connected to the FPGA module.
8. The rail transit vehicle-mounted signal equipment testing device according to claim 6, characterized in that: The output end of the digital-to-analog converter is connected to the FPGA module via an SPI interface.