Train traction enable command allows safe operation safeguard method in fault scenarios

Abstract

The application discloses a train traction enable command allows safe operation guarantee method in a failure scene, comprising: step S1, failure response trigger: when the vehicle signal system detects that the traction enable output failure is allowed, the vehicle signal system applies emergency braking; step S2, brake release condition: when the preset conditions are all met, the vehicle signal system automatically releases the emergency braking; step S3, brake trigger condition: when any of the preset conditions is not met, or the train is converted from a moving state to a stable stop state, the vehicle signal system applies and maintains the emergency braking state and is not released; step S4, a cycle monitoring mechanism: return to the step S2, continuously cycle monitoring whether the preset conditions are met, so as to realize dynamic safety control in the failure scene. The application can ensure safety while allowing the train to continue running under the existing framework, so as to maximize the influence of the failure on the operation efficiency.

Description

Technical Field

[0001] This invention belongs to the field of rail transit signaling technology, specifically a method for ensuring safe operation under train traction enable command failure scenarios. Background Technology

[0002] The traction enable command is a common method used by rail transit signaling systems to control train traction, serving as a safety input for the train traction unit. When the traction enable command is disabled, the train traction unit continues to receive traction enable, leading to an unsafe and uncontrollable train state. The current practice is to use a disconnect switch to disconnect the onboard signaling system and take the train out of service.

[0003] The shortcomings and deficiencies of the existing practice are as follows: When the on-board signaling system is disconnected, the train can only operate at low speed in a manually restricted mode and loses the on-board ATP protection capability, which affects both operational efficiency and operational safety.

[0004] Therefore, a method for ensuring safe operation under train traction enable command failure scenarios is provided. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this invention provides a method for ensuring safe operation in scenarios where the train traction enable command allows a failure. This method allows the train to continue running within the existing framework while ensuring safety, thereby minimizing the impact of the failure on operational efficiency.

[0006] The technical solution to achieve the above objectives is: The train traction enable command allows for safe operation assurance methods under fault scenarios, including: Step S1, Fault Response Trigger: When the on-board signal system detects that the traction enable output fault is permissible, the on-board signal system applies emergency braking; Step S2, Braking Relief Conditions: When all preset conditions are met, the on-board signal system automatically relieves the emergency braking. Step S3, Braking triggering condition: When any of the preset conditions is not met, or when the train changes from a moving state to a stopped state, the on-board signaling system applies and maintains the emergency braking state without being relieved. Step S4, Cyclic Monitoring Mechanism: Return to step S2 and continuously cycle to monitor whether the preset conditions are met in order to achieve dynamic safety control in fault scenarios.

[0007] Preferably, in step S1, the traction enable output fault is allowed as follows: The train traction unit is in a fault state where it continues to receive traction enable authorization.

[0008] Preferably, in step S2, the preset conditions include: The train is stationary; The car doors are closed and locked and no longer respond to the open command; The platform screen door is closed and locked and is no longer responding to opening commands; If the train comes to a complete stop, all the conditions for stopping at the station are met, including the expiration of the stopping time and the absence of any detained trains. The train has a movement authorization; Emergency braking is applied solely due to the cause described in step S1.

[0009] Preferably, in step S3, maintaining the emergency braking state from being relieved means: When the vehicle signal system detects that the conditions are not met or the state changes, it continues to maintain the emergency braking state and does not perform any relief operations.

[0010] Preferably, in step S4, the preset conditions for continuous monitoring are: After returning to step S2, the vehicle signal system checks in real time whether the preset conditions are met.

[0011] Preferred options also include: Step S5, Fault Recovery: When the on-board signaling system detects that the traction enable output fault has been recovered, the train fully resumes normal operation, or is downgraded or withdrawn from operation depending on the number of faults.

[0012] Compared with the prior art, the beneficial effects of the present invention are: This invention ensures train safety by first applying emergency braking in the event of a traction enable command-permitted fault scenario, and then automatically releasing the emergency braking when preset conditions are met, allowing the train to continue running, thus reducing the impact on operational order. This invention achieves dynamic safety control in fault scenarios by monitoring changes in preset conditions in real time and immediately applying emergency braking when the preset conditions are not met, thus ensuring train safety and improving operational efficiency. By clearly defining the specific content of the preset conditions, this invention ensures the rationality and reliability of braking release and application, and avoids misjudgment and misoperation. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of the method for ensuring safe operation under fault scenarios permitted by the train traction enable command of the present invention. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] like Figure 1 As shown, the train traction enable command allows for safe operation assurance methods under fault scenarios, including: Step S1, Fault Response Trigger: When the onboard signaling system detects that the traction enable output fault is allowed, the onboard signaling system applies emergency braking to bring the train to a rapid stop.

[0016] In this embodiment, a traction enable output fault is allowed as follows: The train traction unit is in a fault state where it continues to receive traction enable authorization.

[0017] Step S2, Braking Relief Conditions: When all preset conditions are met, the on-board signal system automatically relieves the emergency braking.

[0018] In this embodiment, the preset conditions include: (1) The train is stationary: the speed of the train is detected as 0 by the speed sensor; (2) The doors are closed and locked and no longer respond to the door opening command: The door status sensor detects that all doors are closed and locked, and the vehicle signal system no longer receives the door opening command from the door control unit; (3) The shielding doors are closed and locked and no longer respond to the opening command: The shielding door status sensor detects that all shielding doors are closed and locked, and the vehicle signal system no longer receives the opening command from the shielding door control unit; (4) If the train stops accurately and stably, all stopping conditions are met, including the stop time expiring and no train being impounded: the platform positioning sensor detects whether the train stops accurately and stably. If it stops accurately and stably, the stop time is checked and there is no train impounding order from the automatic train monitoring system. (5) The train has a movement authorization: the onboard signaling system receives movement authorization information from the automatic train monitoring system or the area controller; (6) Emergency braking is applied only for the reason described in step S1: The reason for applying emergency braking is detected by the braking system status sensor as a traction enable command permission failure.

[0019] When all the above preset conditions are met, the on-board signaling system sends an emergency braking release command to the braking system, which then releases the emergency braking, allowing the train to continue running.

[0020] Step S3, Braking triggering condition: When any of the preset conditions is not met, or when the train changes from a moving state to a stopped state, the on-board signaling system applies and maintains the emergency braking state without being relieved.

[0021] In this embodiment, maintaining the emergency braking state from being relieved is as follows: When the vehicle signal system detects that the conditions are not met or the state changes, it continues to maintain the emergency braking state and does not perform any relief operations.

[0022] Specifically, it includes the following: Triggering condition judgment The system monitors in real time whether the preset conditions of step S2 are met. Emergency braking is triggered when any of the following conditions are detected: If any of the preset conditions changes from being met to not being met, such as the train speed becoming non-zero, the doors opening, the platform screen doors opening, the stop time not expiring, there is a train impoundment order, the movement authorization is lost, or emergency braking is applied for other reasons, etc. The train transitions from a moving state to a stopped and precise state by detecting that the train speed has become 0 through the speed sensor and that the train has come to a complete stop through the platform positioning sensor. Braking action When the triggering condition is detected, the on-board signaling system immediately sends an emergency braking command to the braking system, which then applies emergency braking to bring the train to a rapid stop. State maintenance mechanism After emergency braking is applied, the onboard signaling system continuously monitors whether the triggering conditions have been eliminated. Failure to eliminate triggering conditions includes: None of the preset conditions are still met; The train is still in a stopped and accurate state and has not met the preset conditions of step S2; The onboard signaling system maintains the emergency braking state until the triggering conditions are eliminated.

[0023] Step S4, Cyclic Monitoring Mechanism: Return to step S2 and continuously cycle to monitor whether the preset conditions are met in order to achieve dynamic safety control in fault scenarios.

[0024] In this embodiment, the preset conditions for continuous monitoring are: After returning to step S2, the vehicle signal system checks in real time whether the preset conditions are met.

[0025] Specifically, after the train comes to a complete stop, the onboard signaling system returns to step S2. Based on the braking release conditions in step S2, it continuously monitors whether the preset conditions are met in a loop to achieve dynamic safety control in fault scenarios. When all preset conditions are met, the emergency braking is released again based on the braking trigger conditions in step S3, allowing the train to continue running. When the preset conditions are not met, the emergency braking state is maintained.

[0026] Step S5, Fault Recovery: When the on-board signal system detects that the traction enable output fault has been recovered, the train fully resumes normal operation, or it can be downgraded or taken out of operation based on the number of faults. For example, if the number of faults reaches a preset threshold, the train will automatically be downgraded to manual driving mode or taken out of operation for maintenance.

[0027] This invention, through dynamic safety control under fault scenarios permitted by traction enable commands, ensures the safety of train operation, reduces the impact on operational order, and improves operational efficiency.

[0028] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for ensuring safe operation under fault scenarios where train traction enable command is allowed, characterized in that: include: Step S1, Fault Response Trigger: When the on-board signal system detects that the traction enable output fault is permissible, the on-board signal system applies emergency braking; Step S2, Braking Relief Conditions: When all preset conditions are met, the on-board signal system automatically relieves the emergency braking. Step S3, Braking triggering condition: When any of the preset conditions is not met, or when the train changes from a moving state to a stopped state, the on-board signaling system applies and maintains the emergency braking state without being relieved. Step S4, Cyclic Monitoring Mechanism: Return to step S2 and continuously cycle to monitor whether the preset conditions are met in order to achieve dynamic safety control in fault scenarios.

2. The method for ensuring safe operation under fault scenarios permitted by train traction enable command according to claim 1, characterized in that, In step S1, the traction enable output fault is allowed as follows: The train traction unit is in a fault state where it continues to receive traction enable authorization.

3. The method for ensuring safe operation under fault scenarios permitted by train traction enable command according to claim 1, characterized in that, In step S2, the preset conditions include: The train is stationary; The car doors are closed and locked and no longer respond to the open command; The platform screen door is closed and locked and is no longer responding to opening commands; If the train comes to a complete stop, all the conditions for stopping at the station are met, including the expiration of the stopping time and the absence of any detained trains. The train has a movement authorization; Emergency braking is applied solely due to the cause described in step S1.

4. The method for ensuring safe operation under fault scenarios where the train traction enable command is allowed, as described in claim 1, is characterized in that... In step S3, maintaining the emergency braking state from being relieved means: When the vehicle signal system detects that the conditions are not met or the state changes, it continues to maintain the emergency braking state and does not perform any relief operations.

5. The method for ensuring safe operation under fault scenarios where the train traction enable command is allowed, as described in claim 1, is characterized in that... In step S4, the preset conditions for continuous monitoring are: After returning to step S2, the vehicle signal system checks in real time whether the preset conditions are met.

6. The method for ensuring safe operation under fault scenarios where the train traction enable command is allowed, as described in claim 1, is characterized in that... Also includes: Step S5, Fault Recovery: When the on-board signaling system detects that the traction enable output fault has been recovered, the train fully resumes normal operation, or is downgraded or withdrawn from operation depending on the number of faults.

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