Urban rail transit signal system simulation platform

Abstract

The invention discloses an urban rail transit signal system simulation platform, which belongs to the field of rail transit signal system testing and comprises an upper computer module and a lower computer main control board module. The upper computer module is in communication connection with the lower computer main control board module; the lower computer main control board module comprises a main control board, an input board and an output board; the upper computer module is in communication connection with the main control board, and the main control board is in communication connection with the input board and the output board. The power supply end of the lower computer main control board module is electrically connected with the power supply module; and the power supply module is electrically connected with the input board and the output board through the lower computer main control board module. According to the invention, the functions of displaying indoor signals and controlling signals output to the indoor are integrated, and different models can be easily drawn in the upper computer according to different station yard drawings. The lower computer main control board module adopts a plug-in board card design, the size is further reduced, the tasks of communication and power supply are realized by a single main control board, the size is greatly reduced, and the portability is improved.

Description

Technical Field

[0001] The present invention relates to the field of testing of rail transit signal systems, and particularly to an urban rail transit signal system simulation platform. Background Art

[0002] An urban rail transit signal system simulation platform is a software and hardware integrated platform used for simulating, testing, researching, and training signal systems of urban rail transit such as subways, light rails, and trams. Through high-precision simulation technology, it restores the working environment, control logic, and operation scenarios of real signal systems, and is mainly used for design verification, fault analysis, personnel training, and operation optimization, etc. The urban rail transit signal system simulation platform has significant advantages in aspects such as design verification, operation optimization, personnel training, and safety guarantee, and can significantly improve the reliability, efficiency, and economy of the rail transit system.

[0003] Existing urban rail transit signal system simulation platforms need to customize one-to-one physical display platforms according to station yard maps. LED lights are used on the display platforms to show whether the indoor output circuit is conducting, and switches are used to transmit relay state information to the indoor. The circuit wiring is complex, the cost is high, the reusability is low, the volume is large, and it is not easy to move. Summary of the Invention

[0004] Aiming at the above problems existing in the prior art, the purpose of the present invention is to provide an urban rail transit signal system simulation platform to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An urban rail transit signal system simulation platform includes a host computer module and a slave computer main control board module; the host computer module and the slave computer main control board module are communicatively connected; the slave computer main control board module includes a main control board, an input board, and an output board; the host computer module is communicatively connected to the main control board, and the main control board is respectively communicatively connected to the input board and the output board; the power supply end of the slave computer main control board module is electrically connected to a power supply module; the power supply module is electrically connected to the input board and the output board through the slave computer main control board module.

[0007] As a further solution of the present invention: the host computer module is connected to the main control board in the slave computer main control board module through Ethernet or RS485 protocol.

[0008] As a further solution of the present invention: the host computer module is a Qt host computer.

[0009] As a further solution of the present invention: the main control board includes a first single-chip microcomputer, the first single-chip microcomputer is connected to a first 485 transceiver, and the first 485 transceiver is connected to the upper computer module channel through a 485 interface; the first single-chip microcomputer is connected to a second 485 transceiver, and the second 485 transceiver is connected to a board interface; the first single-chip microcomputer is communicatively connected to an Ethernet-to-serial module, and the Ethernet-to-serial module is electrically connected to the output end of a step-down circuit; the output end of the step-down circuit is electrically connected to the first single-chip microcomputer; the output end of the step-down circuit is simultaneously electrically connected to the second 485 transceiver and the board interface; the input end of the step-down circuit is connected to a power module through a power switch; the first single-chip microcomputer is connected to a first operating status indicator through an IO control bus.

[0010] As a further solution of the present invention: the output board includes a second single-chip microcomputer, the second single-chip microcomputer is communicatively connected to a board interface through a third 485 transceiver; the board interface is electrically connected to the second single-chip microcomputer; the output end of the second single-chip microcomputer is connected to a relay control circuit through an IO control bus; the board interface is electrically connected to the relay control circuit; the second single-chip microcomputer is communicatively connected to a first four-bit DIP switch; the second single-chip microcomputer is connected to a second operating status indicator through an IO control bus.

[0011] As a further solution of the present invention: the input board includes a third single-chip microcomputer, the third single-chip microcomputer is communicatively connected to a board interface through a fourth 485 transceiver; the board interface is electrically connected to the third single-chip microcomputer; the input end of the third single-chip microcomputer is connected to a collection circuit through an IO reading line; the board interface is electrically connected to the collection circuit; the third single-chip microcomputer is communicatively connected to a second four-bit DIP switch; the third single-chip microcomputer is connected to a third operating status indicator through an IO control bus.

[0012] As a further solution of the present invention: the collection circuit includes an input port CN1, a fuse F1, a current-limiting resistor R1, a bidirectional opto-coupler switch U1, a pull-up resistor R2, and a capacitor C1; pin 1 of the input port CN1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the current-limiting resistor R1, and the other end of the current-limiting resistor R1 is connected to an input end of the bidirectional opto-coupler switch U1; pin 2 of the input port CN1 is connected to the other input end of the bidirectional opto-coupler switch U1; the collector pin of the bidirectional opto-coupler switch U1 is connected to the input end of the third single-chip microcomputer; the collector pin of the bidirectional opto-coupler switch U1 is connected to one end of the pull-up resistor R2, and the other end of the pull-up resistor R2 is connected to the +5V power supply; the emitter pin of the bidirectional opto-coupler switch U1 is grounded; a capacitor C1 is connected in parallel between the emitter pin of the bidirectional opto-coupler switch U1 and the collector of the bidirectional opto-coupler switch U1.

[0013] As a further solution of the present invention: the pull-up resistor R2 and the capacitor C1 in the collection circuit form an RC first-order filter circuit.

[0014] As a further solution of the present invention: the relay control circuit includes an output port CN2, a relay RLY1, and a Darlington transistor array U2; one end of the pin 1 of the output port CN2 is connected to one end of the normally open contact of the relay RLY1, and the other end of the pin 2 of the output port CN2 is connected to the other end of the normally open contact of the relay RLY1. One end of the coil of the relay RLY1 is connected to the 12V power supply, and the other end of the coil of the relay RLY1 is connected to the pin 18 of the Darlington transistor array U2; the pin 10 of the Darlington transistor array U2 is connected to the 12V power supply; the pin 9 of the Darlington transistor array U2 is grounded; the pin 1 of the Darlington transistor array U2 is connected to the output end of the second single-chip microcomputer.

[0015] As a further solution of the present invention: the model of the Darlington transistor array U2 is ULN2803A.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The present invention uses Qt to develop the upper computer module to replace the traditional display stand, integrates the display of indoor signals, and controls the function of outputting signals to the indoor. In the upper computer, a well-visualized station yard map model can be built through keyboard and mouse operations, and different models can be easily drawn in the upper computer according to different station yard map drawings. The lower computer main control board module adopts a pluggable board design, and different numbers of input boards and output boards can be configured according to the size of the station yard. Each input board provides 20 test points, and each output board provides 40 test points. With the help of the rapidly developing fast charging technology, the present invention uses fast charging technology to improve the required 12V working power supply, further reducing the volume. A single main control board realizes the tasks of communication and power supply, greatly reducing the volume and improving portability. Description of the Drawings

[0018] Figure 1 It is a structural block diagram of a simulation platform for an urban rail transit signal system disclosed in the embodiment.

[0019] Figure 2 It is a structural block diagram of the main control board in a simulation platform for an urban rail transit signal system disclosed in the embodiment.

[0020] Figure 3 It is a structural block diagram of the output board in a simulation platform for an urban rail transit signal system disclosed in the embodiment.

[0021] Figure 4 It is a structural block diagram of the input board in a simulation platform for an urban rail transit signal system disclosed in the embodiment.

[0022] Figure 5 It is a circuit schematic diagram of the acquisition circuit in a simulation platform for an urban rail transit signal system disclosed in the embodiment.

[0023] Figure 6 Schematic diagram of the relay control circuit in an urban rail transit signal system simulation platform disclosed in the embodiment. Specific implementation manner

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "provided with", "connected", "connected" should be understood in a broad sense; for example, it may be a fixed connection, a detachable connection, or an integral connection, it may be a mechanical connection, it may be an electrical connection, it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0026] Please refer to Figure 1-6 , an urban rail transit signal system simulation platform, including a host computer module and a slave computer main control board module;

[0027] The host computer module and the slave computer main control board module are communicatively connected; the slave computer main control board module includes a main control board, an input board and an output board;

[0028] The host computer module and the main control board are communicatively connected, and the main control board is communicatively connected to the input board and the output board respectively;

[0029] The power supply end of the slave computer main control board module is electrically connected to the power supply module; the power supply module is electrically connected to the input board and the output board through the slave computer main control board module; the power supply module facilitates power supply for the slave computer main control board module, the input board and the output board to ensure the normal operation of the circuit.

[0030] The host computer module is connected to the main control board in the slave computer main control board module through Ethernet or RS485 protocol, sends a query command to the main control board of the slave computer main control board module, obtains the status information of the input board and output board reported by the main control board of the slave computer main control board module, displays this information through the host computer interface, and converts the operations of the user on the host computer interface into control commands and sends them to the main control board of the slave computer main control board module. The main control board of the slave computer main control board module sends operation commands to the corresponding output board according to the host computer control command, and the output board acts according to the main control board operation command to control the on and off of specific relays. The host computer also has functions such as drawing the station yard map, saving and opening the station yard map file, regularly querying and displaying the status of the slave computer main control board module, sending control commands to the slave computer main control board module, and selecting and establishing communication methods.

[0031] The main functions of the main control board are to communicate with the output board and obtain its status and send operation commands, communicate with the host computer, report the status of each point of the slave computer main control board module and execute the host computer control command, step down the 12V input power supply to 5V, and provide 12V and 5V power supplies to other boards. The main control board adopts PD and QC fast charging protocols, and can obtain 12V power from a power bank or power adapter that supports the fast charging protocol, reducing the power supply size and improving the portability in this regard when using a power bank for power supply.

[0032] The main function of the input board is to report the status of each point of the board according to the main control board command, and detect the on and off information of the points through the acquisition circuit.

[0033] The host computer module is a Qt host computer;

[0034] The main control board includes a first single-chip microcomputer. The first single-chip microcomputer is connected to a first 485 transceiver, and the first 485 transceiver is connected to the host computer module channel through a 485 interface; the first single-chip microcomputer is connected to a second 485 transceiver, and the second 485 transceiver is connected to the board interface;

[0035] The first single-chip microcomputer is communicatively connected to the Ethernet-to-serial module, and the Ethernet-to-serial module is electrically connected to the output end of the step-down circuit;

[0036] The output end of the step-down circuit is electrically connected to the first single-chip microcomputer; the output end of the step-down circuit is also electrically connected to the second 485 transceiver and the board interface;

[0037] The input end of the step-down circuit is connected to the power module through a power switch;

[0038] The first single-chip microcomputer is connected to the first operating status indicator through the IO control bus, and the working status of the first single-chip microcomputer can be clearly displayed through the first operating status indicator.

[0039] The output board includes a second single-chip microcomputer, which is communicatively connected to the board interface through a third 485 transceiver; the board interface is electrically connected to the second single-chip microcomputer;

[0040] The output end of the second single-chip microcomputer is connected to the relay control circuit through an IO control bus; the board interface is electrically connected to the relay control circuit;

[0041] The second single-chip microcomputer is communicatively connected to the first four-digit DIP switch;

[0042] The second single-chip microcomputer is connected to the second operating status indicator through an IO control bus, and the second operating status indicator is used to conveniently and clearly display the working status of the second single-chip microcomputer.

[0043] The input board includes a third single-chip microcomputer, which is communicatively connected to the board interface through a fourth 485 transceiver; the board interface is electrically connected to the third single-chip microcomputer;

[0044] The input end of the third single-chip microcomputer is connected to the acquisition circuit through an IO reading line; the board interface is electrically connected to the acquisition circuit;

[0045] The third single-chip microcomputer is communicatively connected to the second four-digit DIP switch;

[0046] The third single-chip microcomputer is connected to the third operating status indicator through an IO control bus, and the third operating status indicator is used to conveniently and clearly display the working status of the third single-chip microcomputer.

[0047] As Figure 5 shown, the acquisition circuit includes an input port CN1, a fuse F1, a current-limiting resistor R1, a bidirectional opto-coupler switch U1, a pull-up resistor R2, and a capacitor C1;

[0048] Pin 1 of the input port CN1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the current-limiting resistor R1, and the other end of the current-limiting resistor R1 is connected to one input end of the bidirectional opto-coupler switch U1;

[0049] Pin 2 of the input port CN1 is connected to the other input end of the bidirectional opto-coupler switch U1;

[0050] The collector pin of the bidirectional opto-coupler switch U1 is connected to the input end of the third single-chip microcomputer;

[0051] The collector pin of the bidirectional opto-coupler switch U1 is connected to one end of the pull-up resistor R2, and the other end of the pull-up resistor R2 is connected to the +5V power supply;

[0052] The emitter pin of the bidirectional opto-coupler switch U1 is grounded;

[0053] A capacitor C1 is connected in parallel between the emitter pin and the collector pin of the bidirectional opto-coupler switch U1;

[0054] The basic principle is that when alternating current is input through the input port CN1, the bidirectional optocoupler switch U1 is turned on, the capacitor C1 discharges through the output pin of the bidirectional optocoupler switch U1, a low level appears at IO1, the third single-chip microcomputer collects logic 0. When the input port CN1 is powered on, the bidirectional optocoupler switch U1 is cut off, the capacitor C1 charges through the resistor R2, a high level appears at IO1, and the third single-chip microcomputer collects logic 1. Thus, the detection of whether the input is powered on can be realized. Due to the alternating characteristics of alternating current, the optocoupler switch used is a bidirectional optocoupler and can be turned on during both the positive and negative cycles of alternating current. At the same time, the resistor R2 and the capacitor C1 form an RC first-order filter circuit, and near the zero-crossing point of alternating current, the state collected at IO1 can still be ensured to be stable.

[0055] The main function of the output board is to report the status of each point of the board according to the command of the main control board and operate the corresponding relay to act through the relay control circuit.

[0056] As Figure 6 shown, the relay control circuit includes an output port CN2, a relay RLY1, and a Darlington transistor array U2;

[0057] Pin 1 of the output port CN2 is connected to one end of the normally open contact of the relay RLY1, and pin 2 of the output port CN2 is connected to the other end of the normally open contact of the relay RLY1.

[0058] One end of the coil of the relay RLY1 is connected to the 12V power supply, and the other end of the coil of the relay RLY1 is connected to pin 18 of the Darlington transistor array U2;

[0059] Pin 10 of the Darlington transistor array U2 is connected to the 12V power supply; pin 9 of the Darlington transistor array U2 is grounded;

[0060] Pin 1 of the Darlington transistor array U2 is connected to the output end of the second single-chip microcomputer;

[0061] The model of the Darlington transistor array U2 is ULN2803A;

[0062] Connect the input end of the Darlington transistor array U2 to the control pin of the second single-chip microcomputer through the IO2 network, and set the corresponding pin of the second single-chip microcomputer to the push-pull mode. In this mode, the internal of the single-chip microcomputer pin has a strong pull-up and can provide a driving ability of 20 milliamperes. The basic principle of the relay control circuit is that when it is necessary to conduct the two pins of the output port CN2, the IO2 pin outputs logic 1, provides 5V output to the input pin of U2, the corresponding output pin of the Darlington transistor array U2 is in the conducting state, then the coil of the relay RLY1 is energized, the relay contact is closed, and the output port CN2 is conducted. On the contrary, when the output of the IO2 pin is logic 0, the relay is disconnected and the output port CN2 is open.

[0063] Dip switches are set in both the input board and the output board circuits to configure addresses, enabling encoding of the board cards without modifying the code, facilitating the addition or reduction of the number of board cards and changing the starting address of the board card test points. The three types of board cards have a unified board card interface, and power supply and communication can be achieved through an 8-pin cable, which is simple and convenient.

[0064] Integrate a bidirectional optocoupler switch acquisition circuit and a DIP address configuration module, supporting 20-point signal detection;

[0065] Integrate a Darlington transistor array drive circuit and a relay, supporting 40-point on / off control;

[0066] The power module provides 12V / 5V power supply for the input / output board through an 8-pin cable and coordinates data interaction between board cards.

[0067] The relay control circuit of the output board is driven in push-pull mode, and a single pin provides a driving ability of 20mA.

[0068] The upper computer software supports the saving and loading of station yard map files and multi-user permission management.

[0069] The usage steps of an urban rail transit signal system simulation platform are as follows:

[0070] S1. Station yard map modeling and board card configuration

[0071] The upper computer calls the station yard equipment icon library through a graphical interface, including track sections, turnouts, signal lights, etc., supporting drag-and-drop drawing of the station yard layout; automatically scans the lower computer network to obtain the physical addresses of the input board (20 points / board) and the output board (40 points / board), and pre-configures them through the on-board dip switches; the user binds the station yard map elements to the lower computer points and defines the input / output logical relationship, such as the track section corresponding to the 3rd channel of the input board;

[0072] S2. Real-time signal acquisition and data transmission

[0073] The input board detects the on / off state of 220V alternating current through a bidirectional optocoupler acquisition circuit: when alternating current is connected to the input port CN1, the bidirectional optocoupler switch U1 conducts, the capacitor C1 discharges, and the single-chip microcomputer pin IO1 outputs a low level; when there is no input, the optocoupler is cut off, the capacitor C1 charges through the pull-up resistor R2, and IO1 outputs a high level; the main control board reads the status data of each input board according to the polling period (default 50ms), encapsulates it into a Modbus RTU frame with CRC check, and uploads it to the upper computer through the RS485 bus;

[0074] S3. Status parsing and visual presentation

[0075] The host computer analyzes the Modbus frame and extracts the logical values (0 / 1) of each point; dynamically updates the status of the corresponding elements in the station yard diagram, such as the color change of the track section and the simulation of the signal light; real-time displays the voltage waveform of the input board channel, analyzes the stability of the alternating current through the FFT algorithm, and records the historical data curve;

[0076] S4. Control Instruction Generation and Execution

[0077] The user triggers a control operation through the station yard diagram interface, such as clicking on the switch icon, and the host computer generates a control instruction with a timestamp; after the instruction is encrypted, it is sent to the main control board through the TCP / IP protocol, including the target output board address, relay number, and action type, i.e., pick-up / drop; after the main control board verifies the legality of the instruction, it sends a differential signal to the target output board through an 8-bit cable: the Darlington transistor array U2 receives the logic level of the IO2 pin and drives the on / off of the relay RLY1 coil; the relay contact closes to conduct the output port CN2 and drives the external signal device to act;

[0078] S5. Action Feedback and Interlock Verification

[0079] The output board detects the actual state of the relay through the auxiliary contact and generates a status receipt including the action time; the host computer compares the expected instruction with the actual feedback and verifies the interlock logic, such as the change in the occupied state of the track section after the switch is switched; if the verification fails, a three-level alarm mechanism is triggered: the elements in the station yard diagram flash, the buzzer gives a prompt, and a fault log including the voltage fluctuation record is generated.

[0080] Furthermore, the input board and the output board are dynamically configured with addresses through the DIP switch, supporting hot-swap expansion.

[0081] The present invention uses Qt to develop the host computer module to replace the traditional display stand, integrates the function of displaying indoor signals, and controls the signals output to the indoor. A visually good station yard diagram model can be built through keyboard and mouse operations in the host computer, and different models can be easily drawn in the host computer according to different station yard diagram drawings. The main control board module of the lower computer adopts a pluggable board design, and different numbers of input board cards and output board cards can be configured according to the size of the station yard. Each input board card provides 20 test points, and each output board card provides 40 test points.

[0082] The main control board module of the lower computer of the present invention uses a combined board. The size of a single board is 235*35*155mm. Each single input board card can provide 20 test points, and each single output board card can provide 40 test points. With the help of the rapidly developing fast charging technology, the present invention uses fast charging technology to improve the required 12V working power supply, further reducing the volume. A single main control board realizes the tasks of communication and power supply, greatly reducing the volume and improving portability.

[0083] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0084] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An urban rail transit signal system simulation platform, characterized in that It includes a host computer module and a slave computer main control board module; the host computer module and the slave computer main control board module are communicatively connected; the slave computer main control board module includes a main control board, an input board, and an output board; the host computer module is communicatively connected to the main control board, and the main control board is respectively communicatively connected to the input board and the output board; the power supply terminal of the slave computer main control board module is electrically connected to the power supply module; the power supply module is electrically connected to the input board and the output board through the slave computer main control board module.

2. The simulation platform of an urban rail transit signal system according to claim 1, wherein The host computer module is connected to the main control board in the slave computer main control board module through Ethernet or the RS485 protocol.

3. The simulation platform of an urban rail transit signal system according to claim 2, wherein The host computer module is a Qt host computer.

4. The simulation platform of an urban rail transit signal system according to claim 1, characterized in that, The main control board includes a first single-chip microcomputer, the first single-chip microcomputer is connected to a first 485 transceiver, the first 485 transceiver is communicatively connected to the host computer module through a 485 interface; the first single-chip microcomputer is connected to a second 485 transceiver, and the second 485 transceiver is connected to a board interface; the first single-chip microcomputer is communicatively connected to an Ethernet-to-serial port module, and the Ethernet-to-serial port module is electrically connected to the output terminal of a buck circuit; the output terminal of the buck circuit is electrically connected to the first single-chip microcomputer; the output terminal of the buck circuit is simultaneously electrically connected to the second 485 transceiver and the board interface; the input terminal of the buck circuit is connected to the power supply module through a power switch; the first single-chip microcomputer is connected to a first operating status indicator through an IO control bus.

5. The simulation platform of an urban rail transit signal system according to claim 4, characterized in that, The output board includes a second single-chip microcomputer, the second single-chip microcomputer is communicatively connected to the board interface through a third 485 transceiver; the board interface is electrically connected to the second single-chip microcomputer; the output terminal of the second single-chip microcomputer is connected to a relay control circuit through an IO control bus; the board interface is electrically connected to the relay control circuit; the second single-chip microcomputer is communicatively connected to a first four-bit DIP switch; the second single-chip microcomputer is connected to a second operating status indicator through an IO control bus.

6. The simulation platform of an urban rail transit signal system according to claim 5, characterized in that The input board includes a third single-chip microcomputer, the third single-chip microcomputer is communicatively connected to the board interface through a fourth 485 transceiver; the board interface is electrically connected to the third single-chip microcomputer; the input terminal of the third single-chip microcomputer is connected to a collection circuit through an IO reading line; the board interface is electrically connected to the collection circuit; the third single-chip microcomputer is communicatively connected to a second four-bit DIP switch; the third single-chip microcomputer is connected to a third operating status indicator through an IO control bus.

7. The simulation platform for an urban rail transit signal system according to claim 6, wherein The collection circuit includes an input port CN1, a fuse F1, a current-limiting resistor R1, a bidirectional opto-coupler switch U1, a pull-up resistor R2, and a capacitor C1; pin 1 of the input port CN1 is connected to one end of the fuse F1, the other end of the fuse F1 is connected to one end of the current-limiting resistor R1, and the other end of the current-limiting resistor R1 is connected to one input terminal of the bidirectional opto-coupler switch U1; pin 2 of the input port CN1 is connected to the other input terminal of the bidirectional opto-coupler switch U1; the collector pin of the bidirectional opto-coupler switch U1 is connected to the input terminal of the third single-chip microcomputer; the collector pin of the bidirectional opto-coupler switch U1 is connected to one end of the pull-up resistor R2, and the other end of the pull-up resistor R2 is connected to the +5V power supply; the emitter pin of the bidirectional opto-coupler switch U1 is grounded; a capacitor C1 is connected in parallel between the emitter pin of the bidirectional opto-coupler switch U1 and the collector of the bidirectional opto-coupler switch U1.

8. The simulation platform of an urban rail transit signal system according to claim 7, characterized in that In the described acquisition circuit, the pull-up resistor R2 and the capacitor C1 form an RC first-order filter circuit.

9. The simulation platform of an urban rail transit signal system according to claim 5, characterized in that The described relay control circuit includes an output port CN2, a relay RLY1, and a Darlington transistor array U2; Pin 1 of the output port CN2 is connected to one end of the normally open contact of the relay RLY1, and Pin 2 of the output port CN2 is connected to the other end of the normally open contact of the relay RLY1. One end of the coil of the relay RLY1 is connected to the 12V power supply, and the other end of the coil of the relay RLY1 is connected to Pin 18 of the Darlington transistor array U2; Pin 10 of the Darlington transistor array U2 is connected to the 12V power supply; Pin 9 of the Darlington transistor array U2 is grounded; Pin 1 of the Darlington transistor array U2 is connected to the output end of the second single-chip microcomputer.

10. A simulation platform for an urban rail transit signal system according to claim 9, characterized in that, The model of the described Darlington transistor array U2 is ULN2803A.

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