CN109606433B - Road traffic signal simulation system applied to tramcar - Google Patents

Abstract

The invention relates to a road traffic signal simulation system applied to a tram, which comprises an industrial personal computer and a tram track signal system OLC, wherein the industrial personal computer is connected with the tram track signal system OLC through a DIO board card, a UI interaction module, a traffic flow simulation module and a road traffic signal control system TSC are embedded in the industrial personal computer, the UI interaction module is respectively connected with the tram track signal system OLC and the traffic flow simulation module, and the traffic flow simulation module is connected with the road traffic signal control system TSC. Compared with the prior art, the method has the advantages of providing a real and reliable tramcar signal system simulation environment and the like.

Description

A road traffic signal simulation system applied to trams

Technical field

The invention relates to a road traffic signal simulation system, and in particular to a road traffic signal simulation system applied to trams.

Background technique

In the current urban public transportation system, modern trams have begun to re-enter people's vision as a new generation of green and sustainable transportation. They have medium transportation capacity, low cost, short construction period, low pollution, and low noise. Characteristics, it is very suitable to undertake the function of backbone public transportation in small and medium-sized cities in my country or connecting suburbs around large cities. Many cities in our country have gradually begun to build modern tram lines. The main application scenario of modern tram systems is urban road traffic, which does not have a completely enclosed driving space. Most urban road intersections are laid out in the form of level crossings, resulting in the need for trams to share the right of way with road traffic at intersections. In order to increase the travel speed of trams, many tram projects have adopted an intersection control model that introduces intersection priority. When the tram approaches the intersection, the tram trackside signaling system will send a signal of the train's approach to the road traffic signal control system. The road traffic control machine will then complete the calculation and feedback the status of the communication signal to the tram signaling system. When the signal is open, the tram signaling system will open its exclusive signal light for the train, allowing trains to pass and ensuring the safety of road traffic.

In actual engineering projects, industrial computers, traffic flow simulation software and DIO boards are used to build a tram traffic simulation signal system, which can simulate the traffic flow of the entire tram line, and can be based on the actual project According to the design requirements, the signal status of each intersection is output to the tram intersection priority system in real time through the DIO board, simulating the data interaction between the road traffic signal system and the tram signal system, and realizing both road traffic and tram signals. Interconnection of large systems. The simulation system can be connected with the tram simulation test platform to more realistically simulate the actual operating status of the tram. It can be used as a traffic simulation study of tram and road traffic flow, and can also be used as a tram intersection priority The signal system testing tool has the advantages of simple deployment, low cost, and high simulation restoration.

At present, there is no simulation test platform in China that integrates road traffic control systems and tram signaling systems. Most simulation tests for trams are only based on the tram module in traffic flow simulation software. Common traffic flow simulation software does not have the function of completely simulating the tram signaling system, so the simulation results are often quite different from the actual operation results. Therefore, building a complete tram road signal simulation test software to realize the connection between the road traffic simulation platform and the track signal system simulation platform is of extremely important significance in the design of the tram system, equipment testing, and road traffic impact analysis. .

Contents of the invention

The purpose of the present invention is to provide a road traffic signal simulation system applied to trams in order to overcome the above-mentioned defects in the prior art.

The object of the present invention can be achieved through the following technical solutions:

A road traffic signal simulation system applied to trams, including an industrial computer and a tram track signal system OLC. The industrial computer is connected to the tram track signal system OLC through a DIO board. The industrial computer Embedded UI interactive module, traffic flow simulation module and road traffic signal control system TSC, the UI interactive module is connected to the tram track signal system OLC and the traffic flow simulation module respectively, and the traffic flow simulation module is connected to the road traffic Signal control system TSC connection;

After receiving the detector signal of the tram track signal system OLC through the DIO board, the UI interaction module outputs it to the TSC through the software interface to achieve the priority triggering of the tram intersection in the simulation scenario. TSC can then based on these priorities signal, run the tram intersection priority strategy and adjust the road signal. After simulating the application of TSC intersection priority, when the signal rotates to the tram priority communication phase, the corresponding track signal control instructions are output to the UI interaction module through the software interface, and the UI interacts After the module is analyzed and processed, the DIO board outputs the control signal of the track signal light to the OLC, and finally completes the implementation of tram signal priority and the linkage of the two major systems of the road and track.

Preferably, the DIO board includes a digital input board, a digital output board, a first terminal block, a second terminal block and a relay. The digital input board communicates with the tram track signal through the first terminal block. The system OLC is connected, and the digital output board is connected to the tram track signaling system OLC through the second terminal row and the relay.

Preferably, the tram track signal system OLC includes a track signal light, a trackside detector, and a track signal control machine. The track signal control machine is connected to the track signal light and the trackside detector respectively. The trackside signal controller Detectors are placed on tram tracks adjacent to intersections;

The trackside detectors are arranged in different locations according to different functions. They can be divided into warning detectors, request detectors, entry detectors and departure detectors from far to near the intersection;

When the train passes the trackside detector, the trackside detector will be excited and output a level signal to the track signal control machine. After receiving the signal, the track signal control machine will output the corresponding signal to the TSC according to the control logic. And based on the feedback from TSC, the track lights of the tram are driven to achieve unified linkage of tram signals and road traffic signals.

Preferably, the UI interactive module is an operation interface provided to the user. The user can intuitively see the trackside detectors, track signal lights, intersection priority notices, requests, and other information in the tram signaling system on the operation interface. occupied status;

Through manual input mode, control the status of each trackside detector and track signal lights in the tram track signaling system OLC to simulate different test scenarios;

Load the simulation map and view the real-time running status and key parameters of the train in the simulation scene through the interface of the traffic flow simulation module.

Preferably, the traffic flow simulation module uses the interface of the traffic flow simulation software to realize docking with the simulation scene in the background, and can output various key parameters and traffic evaluation results in the road traffic flow simulation scene to the UI interaction module, and the UI interaction The module can input the control parameters of the track signal system into the simulation scene through the interface to complete the simulation of the operation of the tram on the real line.

Preferably, the industrial computer is connected to the tram track signal system OLC through level signal collection;

Among them, the industrial computer has an expandable board slot. Users can install a corresponding number of DIO boards according to needs. Through the driver and development tools of the DIO board, the semaphores of the operating system software and the physical level semaphores can be realized. Conversion to realize input and output from software level to hardware level.

Preferably, the DIO board can be connected to an external terminal block and relay, so that the simulation system can adapt to OLCs with different input and output layouts, and can support input and output signal collection under different voltages; in this way, hardware and software can be integrated Fully simulate the real OLC and TSC interface.

Preferably, the simulation system not only supports the simulation of a single intersection priority system on a tram line, but can also support simulation testing of multiple intersections or even the entire line;

According to the number of intersections and semaphores required by users, the industrial computer and DIO board can be expanded to provide users with multi-intersection simulation test scenarios;

At the same time, in response to the testing requirements of multi-intersections, the simulation system also has an Ethernet interface and communication method. When users do not need to access a large number of real OLCs, the simulation system can realize data interaction with the outside through the network, in the form of Ethernet Input and output acquisition semaphores.

Preferably, the UI interactive module provides users with a graphical display interface and user-friendly interactive operations. In actual engineering application scenarios, the trackside detector outputs the excitation signal, the level signal output by the OLC to the TSC, and the TSC output signal to the TSC. The lamp position control signals output by OLC are intuitively presented in the UI interactive module;

The UI interaction module provides users with two control modes, automatic input mode and manual input mode. In the automatic input mode, the simulation system can drive the TSC and industrial computer based on the detector signal collected from the real OLC, and send signals to the OLC in real time. Output the control semaphore of the tram’s special signal light;

Users can intuitively see the sending and receiving status of each semaphore on the UI interactive module interface: notice, request, entry and exit detector status, tram special signal light status, road traffic flow operation status;

In manual input mode, all trackside detectors and track signal lights on the interface will become clickable. Users can manually complete the input or output of semaphores by clicking on the detector and track signal light controls on the interface;

Manual mode will fully enhance the freedom of user testing. Users can click on the controls to simulate some complex scenarios that are difficult to occur in actual operation, or simulate some abnormal input and output to evaluate the operational stability of OLC, enriching user testing. This method helps users achieve comprehensive testing of OLC.

Preferably, in terms of traffic simulation, the simulation system provides users with two control methods: accompanying and priority request;

In accompanying mode, the simulation system will no longer collect detector signals generated by clicks on the OLC or UI interactive module. TSC will maintain its operation in conventional road traffic control mode. The simulation system will not give priority to tram opening intersections. signal, but when the TSC rotates to the phase belonging to the tram, it will output the open traffic signal of the tram's special signal light to the OLC. In this mode, the tram will not be able to pass first when it arrives at the intersection, but it will not Road traffic flow has a greater impact;

In priority request mode, the simulation system will collect detector signals generated by clicks on the OLC or UI interactive module. TSC will respond based on the collected warning, request, entry and departure signals. When the tram arrives at the intersection, it will respond based on the priority strategy. Output the open traffic signal of the tram's special signal light to the OLC to implement signal priority for the tram.

Compared with the prior art, the present invention has the following advantages:

(1) A complete tram traffic signal simulation system has been built, including the road traffic signal control system TSC, tram urban road simulation environment, track signal control system OLC and UI interactive software, providing a real and reliable tram Signal system simulation environment. It can realize the operation simulation of tram. As a simulation evaluation tool for tram operation, it can provide users with a comprehensive evaluation of tram operation and road traffic flow along the line under a specific planning scheme. It can be used in line planning, operation management, site Provide reliable evaluation and analysis of design plans in terms of layout and other aspects.

(2) The simulation system uses industrial computers, IO boards, and terminal blocks to restore the interface between the OLC system and the TSC system. It can adapt to the needs of different OLC systems, is easy to deploy and expand, and supports simultaneous simulation and testing of signal control at multiple intersections. The system can provide a real test environment and complex intersection priority scenarios for the OLC system, and can be used as a test and verification tool for the OLC system.

(3) The UI software provides a manual input mode. Users can control any input and output between the TSC and OLC systems by clicking on the interface, providing users with sufficient testing freedom, especially for the simulation of some complex scenarios.

(4) The simulated TSC system supports two working modes: accompanying and priority request, which can provide users with two scenarios of tram running with or without priority request, allowing users to compare and intuitively analyze the intersection priority strategy for tram The benefits brought by operations and the impact on road traffic flow assist users in making decisions.

Description of the drawings

Figure 1 is a schematic diagram of the simulation system architecture;

Figure 2 is a schematic diagram of the connection between the IO module of the simulation system and the OLC system;

Figure 3 is a flow diagram of the simulation system in tram priority mode;

Figure 4 is a schematic diagram of the common intersection Input interface of the UI interaction module;

Figure 5 is a schematic diagram of the common intersection Output interface of the UI interaction module.

Detailed ways

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 part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of the present invention.

The invention is applied to the road traffic signal simulation system of the tram, integrates the road traffic signal control system (TSC, traffic signal controller, controls the road traffic flow signal light) on the industrial computer, and realizes the industrial computer through a real DIO board The external IO input and output is used to connect to the real tram track signal system (OLC, optimal level-crossing controller, which controls the dedicated tram signal lights), completely simulating the real physical interface of the two systems. In addition, existing technology is used to integrate the overall architecture of the road traffic signal system into the operating system of the industrial computer through the external interface of the traffic flow simulation software. This enables the software to completely simulate the real road operating environment of a tram, fully restoring the tram's speed, stops, intersections, road traffic flow and other elements in the environment, so that the simulation test can be as close to the actual scene as possible.

The UI interaction module in the simulation system also implements the collection, analysis, and processing of IO module semaphores. After receiving the detector semaphore from the OLC system, it outputs it to the TSC system through the software interface to realize the control of the tram in the simulation scene. Intersection priority is triggered, and the TSC system can operate the tram intersection priority strategy and adjust road signals based on these priority signals, including ending the previous red light phase in advance, extending the tram traffic phase, and inserting a dedicated phase for the tram In other ways, different priority strategies will be determined based on the road signal phase when the tram is expected to arrive at the intersection. After the intersection priority application of the simulated TSC system is applied, when the signal rotates to the tram priority communication phase, the corresponding track signal control instructions are output to the UI interaction module through the software interface. The UI interaction module is analyzed and processed, and then the IO module is sent to the OLC system Output the control signal volume of the track signal lights, and finally complete the implementation of tram signal priority and the linkage of the two major systems of road and track.

This simulation system can be well used to test and verify the real trackside signaling system of trams. It can also be used as an evaluation tool for the impact of trams on the traffic flow along the road, which has very important practical significance.

The present invention is characterized in that the simulation system includes the following key points:

1. The present invention has a complete tram intersection priority system architecture, which basically covers all components of the real tram signal control system, restores the real scene to the maximum extent, and reduces the complexity of the entire system. It can Good operability, easy to deploy, and good scalability. The simulation system of the present invention can be mainly divided into several components, including the road traffic signal control system TSC, the tram urban road simulation environment, the track signal control system OLC and the UI interactive module.

2. Use data acquisition IO boards, terminal blocks, hard wires, relays and other components to realize the interface between the TSC system and the OLC system in actual application scenarios. It realizes the interconnection between the real OLC system and the TSC system integrated on the PC, and retains the true restoration of the interface to the maximum extent, which plays a very important role in test verification and simulation. In addition, the simulation system of the present invention can also provide additional network interfaces to realize the connection between the OLC system and the TSC system in the form of Ethernet. If it is necessary to implement multi-intersection simulation testing, and if not enough OLC cabinets are provided, the present invention can also realize data interaction with the OLC system through the network, and can fully support multi-intersection testing and simulation scenarios.

3. The UI interaction module can provide users with a manual input mode. The manual input mode can give users a great degree of freedom in testing, especially when the simulation system needs to simulate some more complex tram intersection priority scenarios. All trackside detector inputs and signal light control command outputs on the UI software interface can be operated through user clicks to realize the triggering of each input and output to meet the needs of users in different test scenarios. In addition, the simulation system supports two working modes: companion and priority request. When the software is in accompanying mode, the UI software no longer responds to the warning and request detector signals input from the OLC, but controls the rotation of the tram's dedicated signals based on the road signal status output from the TSC system. When the software is in the priority request mode, the UI software will normally transfer the warning and request detector signals input from the OLC to the TSC system. The TSC system needs to give the tram a priority pass signal based on the collected warning and request signals.

The characteristic of key point 1 is that the present invention simulates a complete tram intersection priority system, including the road traffic signal control system TSC, the tram urban road simulation environment, the UI interaction module and the externally connected track signal control system OLC. .

The main components of the TSC system include road signals, road signal control machines and road signal control algorithms. This system is mainly responsible for the control of the road traffic signal system. It also has a tram priority control mode. When no tram arrives at the intersection, Control road traffic signals in a conventional way. When the tram approaches an intersection, it will enter the priority control mode, estimate the time when the train will arrive at the intersection, adjust the road traffic signal, and give priority to the tram to open the traffic phase. The system will collect tram intersection priority notices, requests and occupancy signals from the OLC system. These input signals are in the form of level signals. When the input signals are collected and the tram priority request is completed, TSC will Run the tram priority control algorithm, and output the instruction to turn on the signal light to the OLC system after the signal is adjusted and turned on. The output signal also uses a level signal and is output to the OLC system through hard wires. The interaction between the TSC system and the road traffic flow simulation software is realized through the external interface of the simulation software.

The tram urban road simulation environment refers to the actual operating environment of the tram, which includes the length and direction of the operating line, tram vehicle operation simulation, track line layout, station layout, distribution of intersections along the line, Various factors such as road traffic and pedestrians crossing the street will have a certain impact on the operation of trams. When simulating a tram, the more complete these factors are, the closer the simulation results will be to the real situation. In the present invention, the simulation of the tram urban road environment is realized by road traffic flow simulation software.

The main components of the OLC system include track signal lights, trackside detectors, track signal control machines and track signal control algorithms. This system is mainly responsible for the control of the rail transit signal system. The OLC system will deploy trackside detectors on tram tracks near intersections. Each detector will be deployed in different locations according to different functions. From far to near the intersection, they can be divided into warning, request, entry and exit detectors. When the train passes the detector, the trackside detector will be excited and output a level signal to the OLC control machine. After receiving the signal, OLC will output the corresponding signal to the TSC system according to the control algorithm logic, and according to the TSC system feedback to drive the tram's dedicated signal lights. In this way, the unified linkage of tram signals and road traffic signals can be achieved.

The UI interaction module is the interactive interface with the user. According to the functional division, it can be divided into DIO module, UI interaction module and traffic simulation module. Among them, the DIO module contains a digital input/output board, which can be connected to the OLC system through externally connected terminal blocks and relays. The UI interactive module is an operation interface provided to the user. The user can intuitively see the status of each trackside detector, signal light, and intersection priority notice, request, and occupancy in the tram signaling system on the UI interface; it can be input manually mode to control the status of each detector and signal light in the signaling system to simulate different test scenarios; you can load the simulation map and view the real-time operating status and key parameters of the train in the simulation scenario through the interface of the traffic flow simulation software. The traffic simulation module uses the interface of the traffic flow simulation software to realize the connection with the simulation scene in the background. It can output various key parameters and traffic evaluation results in the road traffic flow simulation scene to the UI interactive interface. The UI interface can also provide the simulation through the interface. The scene inputs the control parameters of the track signal system to complete the simulation of tram operation on the real line.

The characteristic of key point 2 is that the level signal collection method is used between the simulation system of the present invention and the OLC cabinet to restore the application scenario in actual engineering. The industrial computer selected for the simulation system has expandable board slots, and users can install a corresponding number of IO boards according to needs. Through the driver and development tools of the IO board, the conversion of operating system software semaphores and physical level semaphores can be realized, and input and output from the software level to the hardware level can be realized. The board can be connected to external terminal blocks and relays, so that the simulation system can adapt to OLC systems with different input and output layouts, and can support input and output signal collection at different voltages. Using this method can fully simulate the real OLC and TSC system interfaces in hardware and software, making the test simulation process closer to the real situation, helping users to find problems during the test process and reducing the occurrence of problems due to inconsistent test environment. The test is passed due to perfection, but escape problems occur during field application.

In addition, the simulation system not only supports the simulation of a single intersection priority system on a tram line, but also supports simulation testing of multiple intersections and even the entire line. This solution can expand the industrial computer and IO board according to the number of intersections and signals required by the user, providing users with multi-intersection simulation test scenarios. At the same time, for the testing needs of multiple intersections, the simulation system also has an Ethernet interface and communication method. When users do not need to access a large number of real OLC cabinets, the simulation system can realize data interaction with the outside through the network. Form input and output capture semaphores.

Key point 3 is characterized in that the UI interactive module in the present invention provides users with a graphical display interface and user-friendly interactive operations. In actual engineering application scenarios, the trackside detector outputs excitation signals and the OLC system outputs to the TSC system. The level signal, the lamp position control signal output by the TSC system to the OLC system, etc. are all intuitively presented in the UI interactive module. The UI interaction module provides users with two control modes, automatic input mode and manual input mode. In the automatic input mode, the simulation system can drive the TSC system and simulation software based on the detector signal collected from the real OLC cabinet, and output the control signal of the tram's special signal light to the OLC system in real time. Users can intuitively see the sending and receiving status of each semaphore on the UI interactive module interface: notice, request, entry and exit detector status, tram special signal light status, road traffic flow operation status, etc. In manual input mode, all detectors and signals on the interface will become clickable. Users can manually complete the input or output of semaphores by clicking on the detectors, signals and other controls on the interface. The manual mode will fully enhance the user's degree of freedom in testing. Users can click on the controls to simulate some complex scenarios that are difficult to occur in actual operation, or simulate some abnormal input and output to evaluate the operational stability of the OLC system, enriching the user's experience. Testing methods help users achieve comprehensive testing of OLC systems.

In addition, in terms of traffic simulation, the simulation system provides users with two control methods: accompanying and priority request. In accompanying mode, the simulation system will no longer collect detector signals generated from clicks on the OLC system or UI interactive interface. The TSC system will maintain its operation in the conventional road traffic control mode. The simulation system will not be open to trams. Intersection priority signal, but when the TSC system rotates to the phase belonging to the tram, it will output the open traffic signal of the tram special signal light to the OLC. Under this mode, trams will not be able to pass first when they arrive at the intersection, but it will not have a major impact on road traffic flow. In the priority request mode, the simulation system will collect detector signals generated from clicks on the OLC system or UI interactive interface. The TSC system will respond based on the collected warning, request, entry and departure signals. When the tram arrives at the intersection, it will The priority strategy outputs the open traffic signal of the tram's dedicated signal light to the OLC and implements signal priority for the tram.

Regarding the specific implementation of key point 1, as shown in Figure 1, the tram traffic signal simulation system in the example of the present invention includes a UI interactive module, simulated traffic flow software, TSC system and external docking OLC system.

The OLC system can control the tram's special signal lights through the IO semaphore, and realize the warning, request, entry and departure detection of the tram in front of the intersection through the detectors arranged beside the track. The interface between the OLC system and the UI interaction module is a hard-wired level semaphore. In terms of specific implementation, the UI interaction module uses a common PCI board to collect the input and output level signals of the IO port. The main content of the DI input signal includes the detector excitation signal in different driving directions at the intersection in the OLC system, OLC system status, priority mode/accompanying mode switching and other signal quantities. The main content of the DO output signal includes the lighting status of each lamp position of the tram special signal lamp fed back by TSC to the UI interaction module, TSC automatic/manual control mode, TSC system status and other signals.

The DIO module realizes information interaction with the OLC system through the DIO board. The UI interaction module includes algorithm logic and some conventional functions, and can realize data interaction with the OLC system and TSC system according to the switching of manual/automatic mode, priority request/accompanying mode. In addition, the UI software can input specific tram line information through configuration files. The log function mainly records changes in some key parameters of the system during operation, and can provide detailed data sources for analysis after simulation tests. The machine interface uses vivid graphical buttons to build a concise, clear and functionally detailed operation interface for users. The traffic simulation module uses the COM interface of the traffic flow simulation software to realize the connection between the UI software and the traffic flow simulation software. The UI interaction module can transmit the collected status information of each detector to the traffic flow simulation software through this interface, and obtain the status of each signal light group from the traffic flow simulation software to decide on the control instructions for the special tram signal lights in the OLC system. output. In addition, the UI interaction module also has two additional communication interfaces, serial port and Ethernet.

The traffic flow simulation software can provide users with a complete tram line operating environment and can build a tram simulation operating model, involving line maps, stations along the line, driving plans, operating speeds, road traffic flow, intersection signals, and pedestrian crossings. and other factors, can open simulation parameters such as detectors, signals, vehicles, lines, etc. to the outside through the COM interface. In a specific embodiment of the present invention, the TSC system is implemented in the form of software, and its basic parameters (such as intersection signal period, signal phase distribution) and operation logic will be loaded in the simulated traffic flow software. The TSC system can load the regular rotation cycle of the intersection in the traffic flow simulation software in the form of a configuration file, and can drive the set priority strategy and adjust the signal phase of the intersection based on the excitation information of each detector in the traffic flow simulation software. , open the priority pass signal for the tram, and when the phase is switched, output the phase switching information to the simulated traffic flow software to control the changes of the road lights in the simulation software.

In the system architecture of the present invention, as shown in Figure 1, the data flows interacted between the systems are mainly the excitation signals of the detectors and the control signals of the intersection road lights and tram special signal lights.

In view of the specific implementation of key point 2, the connection method between the simulation system and the OLC system in the example of the present invention is as shown in Figure 2. The industrial computer equipped with the simulation system uses a 220V power input, and the signal volume collection between the simulation system and the OLC system uses a 24V power supply. voltage supply. The power supply part realizes the conversion of 220V AC power to 24V DC power to provide power for signal collection.

In the signal input part of the simulation system, the DI board is connected to the terminal block through an adapter cable and forms a 24V loop with the DO signal terminal of the OLC system. When the OLC system closes the DO contact, the simulation system DI collects a certain DI on the board. A 24V voltage difference is generated between the positive terminal and the negative terminal, and the board collects a high-level signal; when the OLC system disconnects the DO contact, the relationship between the positive terminal and the negative terminal of a certain DI on the simulation system DI acquisition board becomes 0V. There is a voltage difference, and the board collects a low-level signal.

In the signal output part of the simulation system, each output of the DO board has three pins, corresponding to the positive pole, negative pole and output signal. There is a 24V voltage difference between the two ends of the OLC signal acquisition end. When the board needs to output a high level, a 24V voltage difference is generated between the signal pin and the positive pin, which drives the relay connected to it. The relay contact is closed, and the DI acquisition terminal of the OLC system forms a loop to collect the input high-level signal. ; When the board needs to output a low level, a 0V voltage difference is generated between the signal pin and the positive pin, the relay contact falls, the DI collection terminal loop of the OLC system is disconnected, and the input low-level signal is collected.

The specific implementation of the control logic of the simulation system is shown in Figure 3. The control logic of the simulation system is as follows. In this embodiment, the control logic for a certain intersection is selected for detailed description. The operation cycle of this control logic is 100ms:

(1) After the control logic is started, the thread controlling a specific intersection starts waiting to receive a warning signal from the OLC for an intersection in a certain direction;

(2) If the intersection warning signal from OLC is not received, the UI interaction module will not act. The TSC system will drive the signal light group in the simulated traffic flow software to rotate according to the conventional signal control mode, and continue to wait for the intersection from OLC. Warning signal, if the intersection warning signal from OLC is received, enter step (3);

(3) After receiving the warning signal, the UI software changes the excitation state of the detector corresponding to the intersection in the traffic simulation flow software. The TSC control algorithm will continuously detect the detector status. After detecting that the warning detector in the simulation software is excited, , estimate the time when the tram will arrive at the intersection, adjust the signal timing of the tram's expected arrival period according to the preset priority strategy, and open, extend or insert the traffic signal phase for the tram in advance;

(4) If the TSC receives the OLC request signal forwarded from the UI software within the time when the tram is expected to arrive at the intersection, it will go to step (6), otherwise it will go to step (5);

(5) If the time does not exceed the waiting period of the request signal, continue to wait for the request signal and return to step (4). If the time exceeds the waiting period of the request signal, return to step (3) and the TSC system restarts. Enter the phase coordination state, readjust the phase, and wait for the train's request signal;

(6) TSC locks the priority passing phase of the tram and waits for the phase to rotate to the tram passing phase. When it rotates to the tram passing phase first, the road traffic signal in the traffic flow simulation software is rotated, and the UI interaction module is in After detecting that the road traffic signal changes to the tram traffic phase, the opening signal of the tram-specific signal light is output to the OLC system to open the tram-specific signal light;

(7) The TSC system waits for the OLC entry signal forwarded from the UI software. If the entry signal is not received, it goes to step (8). If it receives the entry signal, it goes to step (9);

(8) If the dedicated phase time of the tram has not ended at this time, continue to wait and return to step (7). If the dedicated phase time of the tram has ended at this time, the TSC rotates the traffic signal phase and reports to the UI interaction module Output the off signal of the tram's special signal light, return to step (3), the TSC system re-enters the phase coordination state, re-adjusts the phase, and waits for the train's request signal again;

(9) After receiving the entry signal, the TSC system outputs the closing signal of the tram's special traffic signal to the UI software interaction software. The UI interaction module sends the closing signal to the OLC system through the DO board to close the tram's special traffic signal to prevent If a following train enters the intersection, the TSC system will keep the road traffic lights on to ensure that the conflicting road traffic flow will not enter the intersection;

(10) The TSC system waits for the OLC clearing signal forwarded from the UI software. If the clearing signal is not received, it goes to step (11). If it receives the clearing signal, it goes to step (12);

(11) If the time at this time does not exceed the maximum green light time of the dedicated phase of the tram, continue to wait and return to step (10). If the time at this time exceeds the maximum green time of the dedicated phase of the tram, the TSC rotates the traffic signal. Phase, return to step (3), the TSC system re-enters the phase coordination state, re-adjusts the phase, and waits for the train's request signal again;

(12) TSC rotates the traffic signal phase and restores the normal control mode, returns to step (1), and waits for a new warning signal again.

Regarding the specific implementation of key point 3, as shown in Figures 4 and 5, this embodiment describes in detail the situation at an ordinary intersection. On the operation interface of the UI interactive module, there are two parts, input and output.

The input part displays the detector excitation status, OLC system status and TSC priority/accompaniment control mode from the OLC system. Graphical controls are used on the UI interface to present the user with an intuitive display of the intersection situation. When the UI interaction module receives the OLC notice , request, enter, and clear signals, the notice, request, and occupancy detectors in the interface will be lit respectively. It should be noted that after receiving the entry signal, the occupancy detector will be lit, and after receiving the clear signal, the occupancy detector will be lit. After the signal, the occupancy detector will go off. After receiving the TSC priority signal, the TSC priority control lamp will be lit. Otherwise, the lamp will be extinguished and the accompanying control mode will be entered.

The output part displays the tram-specific signal light control status, TSC system status and automatic/manual control mode from the TSC system. Graphical controls are used on the UI interface to present users with an intuitive display of the tram signal control status. When the UI interaction module receives the corresponding lamp position control status from the TSC system, the corresponding lamp position will be lit or extinguished. In addition, the UI software can simulate the trackside detector and send the excitation signal of the trackside detector to the OLC system. The detector excitation signal will be used as an additional means of OLC system test simulation. In the actual use of the simulation system, if the OLC system is not connected to a real trackside detector, the simulation system can output simulated detection to the OLC system through the DO board. The OLC will process the signal and then output it to the DI board of the UI software through DO to complete the entire priority control logic. This signal can only be operated in manual input mode.

Users can switch between automatic input/manual input mode by deploying it on the UI interface. When switching to manual input mode, all the above inputs and outputs will become clickable. Users can pass Clicking the corresponding button generates the corresponding input and output signal volume, which enriches the user's testing methods and enables the simulation system to meet the testing needs for complex, abnormal or fault scenarios. It can be used as a testing tool for the OLC system and is reliable for verifying the real OLC system. Sex and stability have very important meanings.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present invention. Modifications or substitutions shall be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (9)

1. A road traffic signal simulation system applied to trams, which is characterized in that it includes an industrial computer and a tram track signal system OLC. The industrial computer is connected to the tram track signal system OLC through a DIO board. , the industrial computer is embedded with a UI interactive module, a traffic flow simulation module and a road traffic signal control system TSC. The UI interactive module is connected to the tram track signal system OLC and the traffic flow simulation module respectively. The traffic flow simulation module The flow simulation module is connected to the road traffic signal control system TSC; After receiving the detector signal of the tram track signal system OLC through the DIO board, the UI interaction module outputs it to the TSC through the software interface to achieve the priority triggering of the tram intersection in the simulation scenario. TSC can then based on these priorities signal, run the tram intersection priority strategy and adjust the road signal. After simulating the application of TSC intersection priority, when the signal rotates to the tram priority communication phase, the corresponding track signal control instructions are output to the UI interaction module through the software interface, and the UI interacts After the module is analyzed and processed, the DIO board outputs the control signal of the track signal light to the OLC, and finally completes the implementation of tram signal priority and the linkage of the two major systems of the road and track; The tram track signal system OLC includes a track signal light, a trackside detector, and a track signal control machine. The track signal control machine is connected to the track signal light and the trackside detector respectively. The trackside detector is arranged tram tracks adjacent to intersections; The trackside detectors are arranged in different locations according to different functions. They can be divided into warning detectors, request detectors, entry detectors and departure detectors from far to near the intersection; When the train passes the trackside detector, the trackside detector will be excited and output a level signal to the track signal control machine. After receiving the signal, the track signal control machine will output the corresponding signal to the TSC according to the control logic. And based on the feedback from TSC, the track lights of the tram are driven to achieve unified linkage of tram signals and road traffic signals. 2. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the DIO board includes a digital input board, a digital output board, a first terminal row, a third Two terminal blocks and relays, the digital input board is connected to the tram track signaling system OLC through the first terminal block, and the digital output board is connected to the tram track signaling system through the second terminal block and relays in turn OLC connection. 3. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the UI interactive module is an operation interface provided to the user, and the user can intuitively See the trackside detectors, track signal lights, and intersection priority notices, requests, and occupancy status in the tram signaling system; Through manual input mode, control the status of each trackside detector and track signal lights in the tram track signaling system OLC to simulate different test scenarios; Load the simulation map and view the real-time running status and key parameters of the train in the simulation scene through the interface of the traffic flow simulation module. 4. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the traffic flow simulation module uses the interface of the traffic flow simulation software to realize docking with the simulation scene in the background, It can output various key parameters and traffic evaluation results in the road traffic flow simulation scenario to the UI interactive module. The UI interactive module can input the control parameters of the track signal system into the simulation scenario through the interface to complete the operation of the tram on the real line. simulation. 5. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the industrial computer is connected to the tram track signal system OLC through level signal collection; Among them, the industrial computer has an expandable board slot. Users can install a corresponding number of DIO boards according to needs. Through the driver and development tools of the DIO board, the semaphores of the operating system software and the physical level semaphores can be realized. Conversion to realize input and output from software level to hardware level. 6. A road traffic signal simulation system applied to trams according to claim 5, characterized in that the DIO board can be connected to an external terminal block and a relay to enable the simulation system to adapt to different input and output conditions. The deployed OLC can support input and output signal collection at different voltages; using this method, the real OLC and TSC interface can be fully simulated in hardware and software. 7. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the simulation system not only supports the simulation of a single intersection priority system on a tram line, but also supports Simulation tests at multiple intersections and even entire lines; According to the number of intersections and signals required by the user, the industrial computer and DIO board can be expanded to provide users with multi-intersection simulation test scenarios; At the same time, in response to the testing requirements of multi-intersections, the simulation system also has an Ethernet interface and communication method. When users do not need to access a large number of real OLCs, the simulation system can realize data interaction with the outside through the network, in the form of Ethernet Input and output collection semaphores. 8. A road traffic signal simulation system applied to trams according to claim 1, characterized in that the UI interactive module provides users with a graphical display interface and user-friendly interactive operations. In engineering application scenarios, the trackside detector output excitation signal, the level signal output by OLC to TSC, and the lamp position control signal output by TSC to OLC are all intuitively presented in the UI interactive module; The UI interaction module provides users with two control modes, automatic input mode and manual input mode. In the automatic input mode, the simulation system can drive the TSC and industrial computer based on the detector signal collected from the real OLC, and send signals to the OLC in real time. Output the control semaphore of the tram’s special signal light; Users can intuitively see the sending and receiving status of each semaphore on the UI interactive module interface: notice, request, entry and exit detector status, tram special signal light status, road traffic flow operation status; In manual input mode, all trackside detectors and track signal lights on the interface will become clickable. Users can manually complete the input or output of semaphores by clicking on the detector and track signal light controls on the interface; Manual mode will fully enhance the freedom of user testing. Users can click on the controls to simulate some complex scenarios that are difficult to occur in actual operation, or simulate some abnormal input and output to evaluate the operational stability of OLC, enriching user testing. This method helps users achieve comprehensive testing of OLC. 9. A road traffic signal simulation system applied to trams according to claim 1, characterized in that, in terms of traffic simulation, the simulation system provides users with two control modes: accompanying and priority request; In accompanying mode, the simulation system will no longer collect detector signals generated by clicks on the OLC or UI interactive module. TSC will maintain its operation in conventional road traffic control mode. The simulation system will not give priority to tram opening intersections. signal, but when the TSC rotates to the phase belonging to the tram, it will output the open traffic signal of the tram's special signal light to the OLC. In this mode, the tram will not be able to pass first when it arrives at the intersection, but it will not Road traffic flow has a greater impact; In priority request mode, the simulation system will collect detector signals generated by clicks on the OLC or UI interactive module. TSC will respond based on the collected warning, request, entry and departure signals. When the tram arrives at the intersection, it will respond based on the priority strategy. Output the open traffic signal of the tram's special signal light to the OLC to implement signal priority for the tram.