A test device for vehicle safety protection system

Abstract

The utility model provides a test device for a vehicle safety protection system. The test device includes a host computer for issuing control instructions, a microcontroller, a test module and a signal multiplexing circuit for selecting a signal channel, the host computer is bidirectionally connected to the microcontroller, the test module is bidirectionally connected to the microcontroller, and the signal multiplexing circuit is bidirectionally connected to the host computer, the microcontroller, the test module and the target test board in the vehicle safety protection system respectively; the microcontroller outputs a connection instruction to the signal multiplexing circuit based on the received control instruction, and the signal multiplexing circuit conducts the target test board and the test circuit corresponding to the target test board in the host computer or the test module based on the received connection instruction to achieve signal connection. The test device provided by the utility model has the advantages of portability and rapid testing.

Description

Technical Field

[0001] The utility model belongs to the technical field of locomotive safety protection system testing, and in particular relates to a testing device for a vehicle-mounted safety protection system. Background Art

[0002] The 6A locomotive onboard safety protection system (abbreviated as 6A system) is a systematic and platform-based locomotive safety protection system that integrates important matters, key components and parts that endanger safety during the operation of rail transit locomotives. The components detected by the 6A system are key components of the locomotive. The 6A system has been running on the locomotive for a certain number of years. In order to ensure the stable and reliable operation of the locomotive, each maintenance section needs to test the 6A system to ensure safe operation.

[0003] The board cards of the 6A locomotive onboard safety protection system are supplied by different manufacturers, and there are multiple design solutions for each product. The early detection means provided each manufacturer with their own board card inspection and repair tools, which were finally integrated together to form a fixed test bench. The maintenance personnel took the board cards that may have problems to the test bench for testing to determine whether they were faulty. The test bench occupies a large area and cannot effectively monitor the vehicles that stop and go. At the same time, there is also the problem of inconvenient connection of the test board cards. Utility Model Content

[0004] The utility model aims to provide a testing device for a vehicle safety protection system which is easy to carry and convenient to connect with a 6A testing board, and has the advantages of portability and rapid testing.

[0005] To achieve the above object, the utility model provides a test device for a vehicle-mounted safety protection system, wherein the vehicle-mounted safety protection system includes an automatic video monitoring and recording subsystem board, a fire monitoring subsystem board, a train power supply detection subsystem board, an air brake safety monitoring subsystem board, a central processing platform board, and a switch module board. The test device is used to test a target test board in the vehicle-mounted safety protection system, wherein the target test board is any one of the multiple boards included in the vehicle-mounted safety protection system. The test device includes:

[0006] A host computer, the host computer is used to send control instructions based on the target test board to be tested; the host computer is also used to test the central processing platform board and the switch module board;

[0007] A microcontroller, the microcontroller is connected to the host computer for bidirectional communication, and the microcontroller is used to receive the control instruction;

[0008] A test module, the test module comprising an automatic video monitoring and recording subsystem test circuit for testing an automatic video monitoring and recording subsystem board, a fire monitoring subsystem test circuit for testing a fire monitoring subsystem board, a train power supply detection subsystem test circuit for testing a train power supply detection subsystem board, and an air brake safety monitoring subsystem test circuit for testing an air brake safety monitoring subsystem board; the test module is bidirectionally connected to the microcontroller;

[0009] A signal multiplexing circuit, wherein the signal multiplexing circuit is bidirectionally connected to the host computer, the microcontroller, the test module and the target test board respectively;

[0010] The microcontroller outputs a connection instruction to the signal multiplexing circuit based on the received control instruction, and the signal multiplexing circuit connects the target test board and the test circuit corresponding to the target test board in the host computer or the test module based on the received connection instruction to achieve signal connection.

[0011] In a specific implementation, the host computer includes a first serial port RS232, a second serial port RS485, a LAN interface, a first USB interface, and a second USB interface;

[0012] The testing device also includes a USB to CAN circuit, one end of which is connected to the second USB interface of the host computer and the other end is connected to the signal multiplexing circuit. The microcontroller is bidirectionally connected to the host computer through the first serial port RS232.

[0013] In a specific implementation, the signal multiplexing circuit is bidirectionally connected to the host computer through the second serial port RS485, the LAN interface, the first USB interface, and a circuit composed of the second USB interface and the USB to CAN circuit; the microcontroller uses a GIPO communication method to communicate with the signal multiplexing circuit and the test module respectively.

[0014] In a specific implementation, when the central processing platform board is tested, the signal multiplexing circuit connects the first USB interface to the USB interface of the central processing platform board.

[0015] In a specific implementation, when testing the switch module board, the signal multiplexing circuit respectively connects the LAN interface of the host computer with the LAN communication interface of the switch module board, and the USB to CAN circuit with the CAN communication interface of the switch module board.

[0016] In a specific embodiment, the automatic video monitoring and recording subsystem test circuit includes a first subcircuit for generating an audio signal and a second subcircuit for generating a video signal;

[0017] The first sub-circuit includes a MIC, a MIC acquisition circuit and an audio amplifier circuit connected in sequence, a first output end of the audio amplifier circuit is connected to the signal multiplexing circuit, and a second output end of the audio amplifier circuit is connected to the host computer;

[0018] The second sub-circuit includes a camera and a video amplifier circuit connected to each other, a first output end of the video amplifier circuit is connected to the signal multiplexing circuit, and a second output end of the video amplifier circuit is connected to the host computer;

[0019] When the automatic video monitoring and recording subsystem board is tested, the signal multiplexing circuit connects the audio amplifying circuit and the video amplifying circuit to the signal input port of the automatic video monitoring and recording subsystem board.

[0020] In a specific embodiment, the fire monitoring subsystem test circuit includes a fire bus two-bus signal generating circuit, the fire bus two-bus signal generating circuit is bidirectionally connected to the microcontroller, and the two ends of the signal multiplexing circuit are bidirectionally connected to the fire bus two-bus signal generating circuit and the fire monitoring subsystem board card respectively.

[0021] In a specific implementation, the fire monitoring subsystem test circuit further includes a short circuit, open circuit, and loop test circuit, and the output end of the short circuit, open circuit, and loop test circuit is connected to the input end of the fire second bus signal generating circuit.

[0022] In a specific embodiment, the train power supply detection subsystem test circuit includes an RS485 circuit, the host computer is bidirectionally connected to the RS485 circuit, the signal multiplexing circuit is bidirectionally connected to the RS485 circuit and the train power supply detection subsystem board respectively, and the signal multiplexing circuit is bidirectionally connected to the second serial port RS485 of the host computer.

[0023] In a specific embodiment, the air brake detection subsystem test circuit includes a flow generating circuit, the output end of the microcontroller is connected to the input end of the flow generating circuit, and the two ends of the signal complex circuit are bidirectionally connected to the flow generating circuit and the air brake detection subsystem board respectively.

[0024] The beneficial effects of the utility model include at least:

[0025] In the utility model, the test device comprises a host computer, a microcontroller, a test module and a signal multiplexing circuit, the host computer is bidirectionally connected to the microcontroller, the test module is bidirectionally connected to the microcontroller, and the signal multiplexing circuit is bidirectionally connected to the host computer, the microcontroller, the test module and the target test board respectively; the 6A system comprises six boards to be tested, the test module comprises test circuits corresponding to four boards to be tested one by one, and the host computer is also used to detect the remaining two test boards, so that the microcontroller controls the signal multiplexing circuit to select the corresponding channel to make the board to be tested and the test circuit corresponding to the board to be tested in the host computer or the test module conduct to realize signal connection, the board to be tested receives the test signal for testing, and the host computer receives the test result through the communication interface. On the one hand, the test device can test the six test boards included in the 6A system respectively and obtain the test result through the host computer, and on the other hand, the test device is easy to carry and easy to detect, which can greatly improve the detection efficiency.

[0026] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a functional module structure of a vehicle safety protection system test device connected to a vehicle safety protection system provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the functional module structure of the connection between the automatic video monitoring and recording subsystem board and the test device provided in one embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the functional modules for connecting the fire monitoring subsystem board and the test device provided in the first embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the functional modules of the connection between the train power supply detection subsystem board and the test device provided in the first embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the functional modules of the connection between the air brake safety monitoring subsystem board and the test device provided in the first embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the functional modules for connecting the central processing platform board and the test device provided in the first embodiment of the present invention;

[0033] Figure 7A schematic diagram of the functional module structure of the connection between the switch module board and the test device provided in the first embodiment of the present invention;

[0034] Figure 8 for Figure 1 Circuit diagram of the microcontroller shown;

[0035] Fig. 9 A circuit diagram of the connector P1 provided in accordance with an embodiment of the present invention;

[0036] Fig.10 A circuit diagram of K1 provided in accordance with an embodiment of the present invention;

[0037] Fig.11 A circuit diagram of U16 provided in accordance with an embodiment of the present invention;

[0038] Fig.12 A circuit diagram of the connector P2 provided in accordance with an embodiment of the present invention;

[0039] Fig.13 A circuit diagram of K15 provided in accordance with an embodiment of the present invention;

[0040] Fig.14 A circuit diagram of U28 provided in accordance with an embodiment of the present invention;

[0041] Fig.15 A circuit diagram of U34 provided in accordance with an embodiment of the present invention;

[0042] Fig.16 A circuit diagram of a video amplifier circuit provided in accordance with an embodiment of the present invention;

[0043] Fig.17 A circuit diagram of an audio amplifier circuit provided in accordance with an embodiment of the present invention;

[0044] Fig.18 A circuit diagram of RS485 circuits U44 and U46 provided for an embodiment of the present invention;

[0045] Fig.19 A circuit diagram of the RS485 circuit U45 and J10 provided for the first embodiment of this embodiment;

[0046] Fig. 20 A circuit diagram of a flow generator circuit provided in accordance with an embodiment of the present invention;

[0047] Fig.21 A circuit diagram of a functional module structure for connecting a central processing platform board with a host computer provided in an embodiment of the present invention;

[0048] Fig. 22 A circuit diagram of a functional module structure for connecting a switch module card to a host computer provided in an embodiment of the present invention;

[0049] Fig.23 for Figure 1 Circuit diagram of the fire second bus short circuit and open circuit, loop circuit, and test circuit in the embodiment. DETAILED DESCRIPTION

[0050] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention can be defined and covered by a variety of different implementations according to the claims.

[0051] See also Figures 1 to 7 The utility model provides a test device for a vehicle-mounted safety protection system, which is used to test the vehicle-mounted safety protection system. The vehicle-mounted safety protection system includes an automatic video monitoring and recording subsystem board 201, a fire monitoring subsystem board 202, a train power supply detection subsystem board 203, an air brake safety monitoring subsystem board 204, a central processing platform board 205, and a switch module board 206. The test device is used to quickly test and diagnose each board, which has the advantages of convenience, speed and complete functions, and can effectively improve the maintenance and repair efficiency of the on-site operators on the 6A locomotive vehicle-mounted safety protection system board.

[0052] The test device includes a host computer 10, a microcontroller 20, a test module 30, a signal multiplexing circuit 40 and a power supply circuit 50. The host computer 10 is used to issue control instructions and receive test results. The microcontroller 20 is used to receive the control instructions issued by the host computer 10, and control the signal multiplexing circuit 40 to select a signal channel based on the control instructions to turn on the board to be tested and the test circuit / host computer that detects the board to be tested. The power supply circuit 50 is used to provide power to the host computer 10, the microcontroller 20, the test module 30, and the signal multiplexing circuit 40.

[0053] The host computer 10 is used to send control instructions to the microcontroller 20 based on the target test board to be tested, and the target test board is any one of the six boards included in the vehicle safety protection system.

[0054] It is understandable that when the target test boards are different, the control instructions issued by the host computer 10 are different, and the microcontroller 20 enables the signal multiplexing circuit 40 to select different signal channels to conduct, so that the target test boards receive the correct test signals.

[0055] In some embodiments, the host computer 10 refers to a computer that can issue control commands. For example, the host computer 10 can be a personal computer (PC), a master computer, etc., which is not limited in the embodiments of the present application.

[0056] In this embodiment, the host computer 10 has multiple communication ports to facilitate matching with different target test boards.

[0057] Preferably, the host computer includes a first serial port RS232, a second serial port RS485, a LAN interface, a first USB interface, and a second USB interface, and the testing device also includes a USB to CAN circuit, one end of the USB to CAN circuit is connected to the second USB interface of the host computer and the other end is connected to the CAN interface of the signal multiplexing circuit.

[0058] In this embodiment, the USB to CAN circuit is a communication converter, which is used to convert and transmit the format of the signaling exchanged between the host computer 10 and the signal multiplexing circuit 40. It can convert USB signals into CAN signals, and also convert CAN signals into USB signals.

[0059] In this embodiment, the microcontroller 20 is bidirectionally connected to the host computer 10 through the first serial port RS232. The signal multiplexing circuit 40 is bidirectionally connected to the host computer 10 through the second serial port RS485, the LAN interface, the first USB interface, and the line composed of the second USB interface and the USB to CAN circuit.

[0060] The microcontroller 20 is used to receive the control instruction of the host computer 10 , and send a connection instruction to the signal multiplexing circuit 40 and a work instruction to the test module 30 based on the control instruction.

[0061] In this embodiment, the microcontroller 20 is bidirectionally connected to the host computer 10 , that is, in addition to receiving control instructions from the host computer 10 , the microcontroller 20 also feeds back the execution result of the signal multiplexing circuit 40 based on the connection instruction to the host computer 10 .

[0062] In some examples, the execution result can be displayed on the operation screen of the host computer 10, or can also be displayed on the host computer 10 in the form of an indicator light. The execution result can include a symbol corresponding to a successful connection, a code corresponding to a connection failure, a code corresponding to a connection error, etc. The execution result can be a green or red indicator light to represent whether the connection is successful.

[0063] In this embodiment, the model of the microcontroller 20 is STM32F103VET6.

[0064] In this embodiment, the microcontroller 20 communicates with the signal multiplexing circuit 40 and the test module 30 using a GIPO communication method.

[0065] The test module 30 includes an automatic video monitoring and recording subsystem test circuit 31 for testing the automatic video monitoring and recording subsystem board 201, a fire monitoring subsystem test circuit 32 for testing the fire monitoring subsystem board 202, a power supply detection subsystem test circuit 33 for testing the train power supply detection subsystem board 203, and an air brake safety monitoring subsystem test circuit 34 for testing the air brake safety monitoring subsystem board 204.

[0066] In addition, the host computer 10 can also be used to test the central processing platform board 205 and the switch module board 206 .

[0067] In this embodiment, the microcontroller 20 communicates bidirectionally with a part of the test circuit of the test module 30 . For details, refer to the test connection relationship between the components when testing different target test boards below.

[0068] When testing each board, when the target test board is connected to the corresponding test circuit, the microcontroller further outputs a first working instruction based on the received control instruction, wherein the first working instruction is used to control the corresponding test circuit in the test module to test the target test board;

[0069] Alternatively, when the target test board is connected to the host computer, the host computer further outputs a second working instruction, where the second instruction is used to test the target test board.

[0070] That is, when the test target test board adopts the test circuit, the microcontroller is bidirectionally connected with each test circuit, each test circuit receives the first working instruction sent by the microcontroller, and sends a test signal to the signal multiplexing circuit; when the test target test board adopts the host computer test, the second working instruction is directly sent through the host computer, and the second working instruction sends the test signal through the signal multiplexing circuit. Specifically, the signal multiplexing circuit selects the signal channel to connect the communication port of the host computer and the communication port of the target test board, thereby establishing a communication connection.

[0071] The signal multiplexing circuit 40 is used for selecting a signal channel so that the test circuit in the host computer or the test module is connected to the target test board, and the test signal communication is established to complete the test of the target test board.

[0072] The signal multiplexing circuit 40 distributes the input signals of connectors P1 and P2 to different signal circuits through multiple analog switch chips such as ADG5433, ADG1409, ADG1407, HFD4 / 5, etc.; connectors P1 and P2 are used to connect the signal multiplexing circuit 40 and the target test board, and the on-off between the target test board and the test module is realized through the above-mentioned analog switch chips.

[0073] HFD4 / 5 includes K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11; ADG1409 includes U16, U17, U18, U19, U20, U21, U22, U23, U26, U27, U30, U31, U32, U33; ADG5433 includes U24, U25, U28, U29; ADG1407 includes U34 and U35.

[0074] For details on the connection between the above analog switch chip, connector and MCU, please refer to the schematic diagram. Figure 8-Figure 15 The drawings in the specification of the present invention only disclose one signal multiplexing circuit on P1 and P2, and the connection methods of other circuits are the same and will not be described in detail; and corresponding drawings of corresponding analog switch chips are provided. The devices with labels but no drawings are only for the convenience of description and understanding, and no specific drawings are provided.

[0075] Specifically, pin 45 of the STM32 chip is connected to pin 8 of K1, pins 3 and 6 of K1 are connected to connector P1, pin 2 of K1 is connected to pin 9 of U16, pin 7 of K1 is connected to pin 8 of U16, and pins 1, 2, and 16 of U16 are connected to pins 25, 27, and 26 of the STM32 chip one by one.

[0076] Specifically, pin 48 of the STM32 chip is connected to pin 8 of K5, pins 3 and 6 of K5 are connected to connector P2, pin 2 of K5 is connected to pin 8 of U28, pin 7 of K5 is connected to pin 3 of U28, and pins 1, 10, 11, 19, and 20 of U28 are connected to the STM32 chip. Specifically, multiple pins of U34 are electrically connected to P2, and multiple pins are connected to the STM32 chip. The microcontroller GPIO is connected to the control end of the signal multiplexing circuit, which controls the signal multiplexing circuit to select the signal channel.

[0077] The following is an explanation of the connection relationship of the test process of the six boards to be tested.

[0078] See also Figure 2 The automatic video monitoring and recording subsystem test circuit 31 includes a first subcircuit 311 for generating an audio signal and a second subcircuit 312 for generating a video signal.

[0079] The first sub-circuit 311 includes a MIC 3111, a MIC acquisition circuit 3112 and an audio amplifier circuit 3113 connected in sequence. The first output end of the audio amplifier circuit 3113 is connected to the signal multiplexing circuit 40, and the second output end of the audio amplifier circuit 3113 is connected to the host computer 10.

[0080] The microphone (MIC) is continuously working, and the first sub-circuit 311 is always connected to the signal multiplexing circuit, that is, it is not started until the test of the automatic video monitoring and recording subsystem board 201 begins. The first sub-circuit 311 has no direct connection with the microcontroller 20.

[0081] The second sub-circuit 312 includes a camera 3121 and a video amplifier circuit 3122 connected to each other, a first output end of the video amplifier circuit 3122 is connected to the signal multiplexing circuit 40, and a second output end of the video amplifier circuit is connected to the host computer 10;

[0082] The camera is continuously working, and the second sub-circuit 312 is always connected to the signal multiplexing circuit, that is, it is not started until the test of the automatic video monitoring and recording subsystem board 201 begins. The second sub-circuit 312 has no direct connection with the microcontroller 20.

[0083] When testing the automatic video monitoring and recording subsystem board, the audio amplification circuit sends an audio signal to the signal multiplexing circuit, and the signal multiplexing circuit transmits the audio signal to the CAN communication interface of the automatic video monitoring and recording subsystem board, that is, the audio signal is transmitted through the CAN bus, and the signal multiplexing circuit is connected to the interface of the automatic video monitoring and recording subsystem board using the CAN communication signal; the video amplification circuit sends a video signal to the signal multiplexing circuit, and the signal multiplexing circuit transmits the video signal to the LAN signal interface of the automatic video monitoring and recording subsystem board, that is, the video signal is transmitted through the LAN, and the signal multiplexing circuit is connected to the interface of the automatic video monitoring and recording subsystem board using the LAN signal.

[0084] In this embodiment, the LAN interface of the host computer is connected to the automatic video monitoring and recording subsystem board, and the video and audio signals can be retrieved through Ethernet for viewing.

[0085] Please refer to Fig.16 and Fig.17 The video amplifier circuit includes U5, whose pin 11 is connected to pin 4 of U16. Pins 12, 13, and 14 of the THS7374IPW chip are connected to U17, U18, and U19 respectively, and the analog switch of the multiplexing circuits of U17, U18, and U19 is ADG1409. The audio amplifier circuit includes U6, which is electrically connected to MIC and U23 through the plug-in connectors JP15 and J15.

[0086] See also Figure 3The fire monitoring subsystem test circuit 32 includes a fire bus signal generating circuit 321, and the fire bus signal generating circuit 321 is bidirectionally connected to the microcontroller 20. The two ends of the signal multiplexing circuit 40 are bidirectionally connected to the fire bus signal generating circuit 321 and the fire monitoring subsystem board 202 respectively.

[0087] When testing the fire protection monitoring subsystem board, the fire bus 2 signal generating circuit 321 receives the first action instruction 01 sent by the microcontroller 20 and sends the fire protection communication bus 2 signal and the fire detector bus 2 signal to the signal multiplexing circuit 40. The signal multiplexing circuit 40 transmits the received signal to the CAN communication interface of the fire protection monitoring subsystem board, that is, the fire protection communication bus 2 signal and the fire detector bus 2 signal are transmitted via the CAN bus. The signal multiplexing circuit 40 uses the CAN communication signal to connect to the interface of the fire protection monitoring subsystem board 202.

[0088] At the same time, the communication port of the host computer 10 communicates with the fire monitoring subsystem board using the signal multiplexing circuit 40, and can retrieve the current status information of the fire monitoring subsystem board for verification.

[0089] The fire monitoring subsystem test circuit 32 also includes a short circuit, open circuit, and loop test circuit 322 , and the output end of the short circuit, open circuit, and loop test circuit 322 is connected to the input end of the fire second bus signal generating circuit 321 .

[0090] The short circuit, open circuit and loop test circuit 322 is a peripheral circuit connected to the fire bus signal generating circuit 321, and is used to detect the short circuit, open circuit and loop conditions of the fire monitoring subsystem board.

[0091] Please refer to Fig.23 The above signal channel conduction function is specifically implemented by K3 and K4.

[0092] See also Figure 4 The train power supply detection subsystem test circuit 33 includes an RS485 circuit 331, which is bidirectionally connected to the host computer. The two ends of the signal multiplexing circuit 40 are bidirectionally connected to the RS485 circuit 331 and the train power supply detection subsystem board 203 respectively.

[0093] When testing the train power supply detection subsystem board, the RS485 circuit receives the first action instruction 02 sent by the microcontroller 20 and sends the RS485 signal to the signal multiplexing circuit, and the signal multiplexing circuit sends the received RS485 signal to the CAN communication interface of the train power supply detection subsystem board, and the signal multiplexing circuit is connected to the second serial port RS485 of the host computer for communication. In this way, the train power supply detection subsystem board is tested by the signal sent by the RS485 circuit, and the host computer retrieves the detection data of the train power supply detection subsystem board through the second serial port RS485.

[0094] Please refer to Fig.18 and Fig.19 In this embodiment, the RS485 circuit includes U45 and two RS485 chips U44 and U46 electrically connected thereto, U44 is connected to U16, and U46 is connected to U18. The connection relationship between the pins of U44 and U46 is not described in detail here.

[0095] Please read Figure 5 The air brake detection subsystem test circuit 34 includes a flow generating circuit 341, the output end of the microcontroller 20 is connected to the input end of the flow generating circuit 341, and the two ends of the signal complex circuit 40 are bidirectionally connected to the flow generating circuit 341 and the air brake detection subsystem board 204 respectively.

[0096] When testing the air brake detection subsystem test circuit 34, the flow generating circuit 341 receives the first action instruction 03 sent by the microcontroller 20 and sends the current source signal to the signal multiplexing circuit, and the signal multiplexing circuit sends the received current source signal to the CAN communication interface of the air brake detection subsystem board, that is, the current source signal is transmitted through the CAN bus, and the signal multiplexing circuit uses the CAN communication signal to connect to the interface of the air brake detection subsystem board.

[0097] At the same time, the communication port of the host computer 10 communicates with the air brake detection subsystem board 204 using the signal multiplexing circuit 40, and can retrieve the test data of the current air brake detection subsystem board.

[0098] Please refer to Fig. 20 In this embodiment, the current generator circuit includes four current source chips U1, U2, U3, and U4. The connection method of each pin of each current source chip is the same. Only the connection method of U1 is provided here. For details, refer to Fig. 20 , which will not be described in detail here. U1 is directly connected to U16, U2 is directly connected to U17, U3 is directly connected to U20, and U4 is directly connected to U21.

[0099] See also Figure 6 The fourth serial port USB is a signal output port used by the host computer to test the central processing platform board 205. When the central processing platform board 205 is tested, the signal multiplexing circuit 40 connects the fourth serial port USB with the USB port of the central processing platform board.

[0100] It can be understood that the above communication is a two-way communication, and the host computer can directly view the test data.

[0101] See also Fig.21 In this embodiment, the above signal channel conduction function is specifically implemented by K5, K6, K7, and K8.

[0102] See also Figure 7 The third serial port LAN and the second USB interface are signal output ports used by the host computer to test the switch module board 206. When testing the switch module board 206, the signal multiplexing circuit 40 connects the third serial port LAN with the LAN communication interface of the switch module board 206, and the USB to CAN circuit with the CAN communication interface of the switch module board.

[0103] It can be understood that the above communication is a two-way communication, and the host computer can directly view the test data.

[0104] See also Fig. 22 In the present embodiment, it is realized by channel switching of U34 and U35.

[0105] In this embodiment, the functions of the host computer testing the central processing platform board 205 and the switch module board 206 can be implemented based on the circuit, chip or software configured inside the host computer, which is not limited here.

[0106] The power supply circuit 50 provides power for the host computer 10, the microcontroller 20, the test module 30, the multiplexing circuit 40, and the target test board. Specifically, the power supply circuit 50 is electrically connected to the multiplexing circuit 40, and the multiplexing circuit 40 is electrically connected to the host computer 10, the microcontroller 20, the test module 30 and the target test board, respectively.

[0107] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions and substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A test device for a vehicle safety protection system, characterized in that: The vehicle-mounted safety protection system includes an automatic video monitoring and recording subsystem board, a fire monitoring subsystem board, a train power supply detection subsystem board, an air brake safety monitoring subsystem board, a central processing platform board, and a switch module board. The test device is used to test a target test board in the vehicle-mounted safety protection system, and the target test board is any one of the multiple boards included in the vehicle-mounted safety protection system. The test device includes: A host computer, the host computer is used to send control instructions based on the target test board to be tested; the host computer is also used to test the central processing platform board and the switch module board; A microcontroller, the microcontroller is connected to the host computer for bidirectional communication, and the microcontroller is used to receive the control instruction; A test module, the test module comprising an automatic video monitoring and recording subsystem test circuit for testing an automatic video monitoring and recording subsystem board, a fire monitoring subsystem test circuit for testing a fire monitoring subsystem board, a train power supply detection subsystem test circuit for testing a train power supply detection subsystem board, and an air brake safety monitoring subsystem test circuit for testing an air brake safety monitoring subsystem board; the test module is bidirectionally connected to the microcontroller; A signal multiplexing circuit, wherein the signal multiplexing circuit is bidirectionally connected to the host computer, the microcontroller, the test module and the target test board respectively; The microcontroller outputs a connection instruction to the signal multiplexing circuit based on the received control instruction, and the signal multiplexing circuit connects the target test board and the test circuit corresponding to the target test board in the host computer or the test module based on the received connection instruction to achieve signal connection.

2. The testing device for the vehicle safety protection system according to claim 1, characterized in that: The host computer includes a first serial port RS232, a second serial port RS485, a LAN interface, a first USB interface, and a second USB interface; The testing device also includes a USB to CAN circuit, one end of which is connected to the second USB interface of the host computer and the other end is connected to the signal multiplexing circuit. The microcontroller is bidirectionally connected to the host computer through the first serial port RS232.

3. The testing device for the vehicle safety protection system according to claim 2, characterized in that: The signal multiplexing circuit is bidirectionally connected to the host computer through the second serial port RS485, the LAN interface, the first USB interface, and the circuit composed of the second USB interface and the USB to CAN circuit; the microcontroller uses the GIPO communication method to communicate with the signal multiplexing circuit and the test module respectively.

4. The testing device for the vehicle safety protection system according to claim 3, characterized in that: When the central processing platform board is tested, the signal multiplexing circuit connects the first USB interface to the USB interface of the central processing platform board.

5. The testing device for the vehicle safety protection system according to claim 3, characterized in that: When the switch module board is tested, the signal multiplexing circuit respectively connects the LAN interface of the host computer with the LAN communication interface of the switch module board, and the USB to CAN circuit with the CAN communication interface of the switch module board.

6. The vehicle safety protection system testing device according to any one of claims 1 to 5, characterized in that: The automatic video monitoring and recording subsystem test circuit includes a first subcircuit for generating an audio signal and a second subcircuit for generating a video signal; The first sub-circuit includes a MIC, a MIC acquisition circuit and an audio amplifier circuit connected in sequence, a first output end of the audio amplifier circuit is connected to the signal multiplexing circuit, and a second output end of the audio amplifier circuit is connected to the host computer; The second sub-circuit includes a camera and a video amplifier circuit connected to each other, a first output end of the video amplifier circuit is connected to the signal multiplexing circuit, and a second output end of the video amplifier circuit is connected to the host computer; When the automatic video monitoring and recording subsystem board is tested, the signal multiplexing circuit connects the interface between the audio amplifying circuit and the video amplifying circuit and the automatic video monitoring and recording subsystem board.

7. The vehicle safety protection system testing device according to any one of claims 1 to 5, characterized in that: The fire monitoring subsystem test circuit includes a fire bus two-bus signal generating circuit, which is bidirectionally connected to the microcontroller, and two ends of the signal multiplexing circuit are bidirectionally connected to the fire bus two-bus signal generating circuit and the fire monitoring subsystem board card respectively.

8. The testing device for the vehicle safety protection system according to claim 7, characterized in that: The fire monitoring subsystem test circuit also includes short circuit, open circuit and loop test circuits, and the output end of the short circuit, open circuit and loop test circuits is connected to the input end of the fire second bus signal generating circuit.

9. The testing device for the vehicle safety protection system according to any one of claims 2 to 5, characterized in that: The train power supply detection subsystem test circuit includes an RS485 circuit, the host computer is bidirectionally connected to the RS485 circuit, the signal multiplexing circuit is bidirectionally connected to the RS485 circuit and the train power supply detection subsystem board respectively, and the signal multiplexing circuit is bidirectionally connected to the second serial port RS485 of the host computer.

10. The vehicle safety protection system testing device according to any one of claims 1 to 5, characterized in that: The air brake detection subsystem test circuit includes a flow generation circuit, the output end of the microcontroller is connected to the input end of the flow generation circuit, and the two ends of the signal multiplexing circuit are bidirectionally connected to the flow generation circuit and the air brake detection subsystem board respectively.

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