Remission circuit and method for rapid braking fault of train

Abstract

The invention relates to the technical field of train control, and discloses a circuit and a method for relieving a rapid train braking fault. By constructing a braking instruction output circuit, bypass processing and forced relieving of a quick braking instruction are achieved when a quick-acting switch contact in the driver controller breaks down. Particularly, by closing the unmanned driving mode relay and the second driver controller bypass switch, a quick braking instruction of a fault can be quickly interrupted, and safe operation of the train is ensured. In addition, a relieving program is arranged in the brake control unit, a rapid brake relieving strategy under unmanned driving and emergency traction modes is supported, and the ability of the train to deal with sudden failures is further enhanced. In general, the problem that rapid braking cannot be relieved due to the fault of the driver controller is effectively solved, and the overall performance and stability of a train braking system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of train control, and discloses a mitigation circuit and method for train rapid braking failure. Background Art

[0002] In subway or suburban trains, whether manned or unmanned, a controller is equipped. In the manual driving mode, the controller is manually operated to output traction, braking, and direction commands, which are sent to the traction and braking systems through hard wires to control the train operation. The controller is the last means to control the train operation, and its control circuit requires extremely high reliability.

[0003] Since the braking command is valid at low level, when a fault occurs where the quick-acting switch contacts inside the active end controller cannot close, a braking command or a rapid braking command will be continuously output. Especially for the rapid braking command, since the signal system does not output a rapid braking command and its command output depends entirely on the controller, once the quick-acting switch contacts inside the controller fail and continuously give a rapid braking command, there is no way to mitigate it at the active end, and it will directly affect the train control of the signal system. The train cannot be normally tractioned, and it is necessary to change ends to traction the train off the line as soon as possible, affecting the operation efficiency. Summary of the Invention

[0004] Aiming at the above-mentioned existing technical deficiencies, the purpose of the present invention is to provide a mitigation circuit and method for train rapid braking failure, and solve the problem in the prior art that when a fault occurs in the quick-acting switch contacts inside the controller, a rapid braking command is continuously output and cannot be mitigated.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: In the first aspect, the present invention provides a mitigation circuit for train rapid braking failure, including a braking command output circuit; The braking command output circuit includes a 110V DC power supply, a first controller bypass switch, a second controller bypass switch, a controller, an unmanned driving mode relay, an active driver's cab relay, an on-vehicle signal system, a traction control unit, a braking control unit, and a vehicle network; The braking command output circuit further includes a rapid braking command train line and a braking command train line; The 110V DC power supply is sequentially connected to the controller through the first controller bypass switch and the active driver's cab relay; The rapid braking command train line is connected to the controller, the braking control unit, the vehicle network, and the fault mitigation circuit; The braking command train line is connected to the controller, the on-vehicle signal system, the traction control unit, the braking control unit, and the vehicle network; The second controller bypass switch and the driverless mode relay are connected in series to form a fault mitigation circuit, with both ends connected to the 110V DC power supply and the rapid braking command train line respectively.

[0006] Second, the present invention provides a method for mitigating rapid braking faults of a train, including: When the vehicle is in the driverless mode or when the signals of each gear position of the controller key and the control handle are all at a low level, the signal system issues a cab activation command, and the driverless mode relay closes; If the quick-acting switch contacts inside the controller fail and open, and continuously output a rapid braking command, then close the second controller bypass switch to bypass the faulty rapid braking command and achieve forced mitigation of rapid braking.

[0007] Preferably, in a possible implementation manner of the second aspect, the faults of the quick-acting switch contacts inside the controller include coasting position faults and forward position faults.

[0008] Preferably, in a possible implementation manner of the second aspect, the specific steps of bypassing the faulty rapid braking command include: Close the driverless mode relay; Close the second controller bypass switch; The rapid braking command train line directly outputs a high level from the 110V DC power supply to achieve bypass processing of the rapid braking command.

[0009] Preferably, in a possible implementation manner of the second aspect, the method further includes: If the controller key or the quick-acting switch contacts inside the controller fail and continuously output a rapid braking command, cut off the power supply of the controller by opening the first controller bypass switch, force the controller to go offline, and change ends to the other end for driving operation or mitigate the rapid braking through the driverless mode.

[0010] Third, the present invention provides a computer program product, which includes a program for mitigating rapid braking faults of a train. When this program runs on an electronic device, it causes the electronic device to execute any possible implementation method in the second aspect.

[0011] Preferably, in a possible implementation manner of the third aspect, the mitigation program is placed in the brake control unit and is used to automatically degrade to the emergency traction mode to mitigate the rapid braking when the controller contacts fail and the rapid braking cannot be mitigated by upgrading to the driverless mode.

[0012] Preferably, in a possible implementation manner of the third aspect, when the brake control unit detects that the vehicle is in the emergency traction mode, it ignores the hardwired command of the rapid braking and only performs operations according to the current braking command and the braking hardwired level.

[0013] The beneficial effects of the present invention are as follows: By means of the bypass processing method of the braking command output circuit, the problem of continuous rapid braking caused by the failure of the quick-acting switch contacts inside the controller is effectively solved, the forced mitigation of rapid braking is realized, and the safety and operation efficiency of train operation are improved. At the same time, a flexible fault response mechanism is also provided, such as mitigating the fault through the driverless mode or the emergency traction mode, enhancing the reliability and stability of the system. Brief Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 This application provides a circuit diagram of a train rapid braking fault mitigation circuit.

[0016] Figure 2 This application provides a schematic flow diagram of a train rapid braking fault mitigation method.

[0017] Description of the reference numerals: S1 - Controller bypass switch; COR - Activated driver's cab relay; R1 - Driverless mode relay; MC - Controller; SIG - On-vehicle signal system; TCU - Traction control unit; BCU - Brake control unit; TCMS - Vehicle network; Tc - Head car. Detailed Embodiments

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some 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 belong to the scope of protection of the present invention.

[0019] Embodiment 1: As Figure 1 shown, the present invention provides a circuit for mitigating a train rapid braking fault, including a braking command output circuit: The braking command output circuit includes the following components: 110V DC power supply: Provides stable and reliable power support for the entire circuit; The first controller bypass switch: Used to cut off the power supply of the faulty controller under specific circumstances; Second controller bypass switch: used to control the quick braking command in case of controller failure; Controller: internally equipped with a quick-acting switch contact, responsible for outputting traction, braking, and quick braking commands; Driverless mode relay: controls the activation and deactivation of the driverless mode; Activated driver's cab relay: confirms the currently activated driver's cab; On-vehicle signal system: responsible for the operation control of the train in the driverless mode; Traction control unit: receives commands and executes traction operations; Brake control unit: executes braking and quick braking operations according to the received commands; Vehicle network: realizes signal transmission and communication between components.

[0020] The brake command output circuit also includes a quick braking command train line and a brake command train line.

[0021] The 110V DC power supply is connected to the controller through the first controller bypass switch and the activated driver's cab relay in sequence; The quick braking command train line is connected to the controller, brake control unit, vehicle network, and fault mitigation circuit; The brake command train line is connected to the controller, on-vehicle signal system, traction control unit, brake control unit, and vehicle network; The second controller bypass switch and the driverless mode relay are connected in series to form a fault mitigation circuit, with both ends connected to the 110V DC power supply and the quick braking command train line respectively.

[0022] Specifically, the 110V DC power supply is connected to the controller through the first controller bypass switch and the activated driver's cab relay. When the controller is working properly, the first controller bypass switch remains closed, allowing the 110V DC power supply to flow to the controller and provide necessary electrical energy for its internal components. At the same time, the status of the activated driver's cab relay further confirms the currently activated driver's cab, and only the correct driver's cab can control the operation of the train.

[0023] The quick braking command train line is connected to the controller, brake control unit, vehicle network, and fault mitigation circuit. Ensure that in an emergency, the quick braking command issued by the driver through the controller can be quickly transmitted to the brake control unit, thereby triggering the maximum braking force of the train and achieving quick stopping. The priority of the quick braking command is extremely high. Once triggered, it will be executed immediately without any delay or confirmation to ensure the absolute safety of the train.

[0024] The brake command train line connects the controller, on-vehicle signal system, traction control unit, brake control unit, and vehicle network. Through this train line, the driver can issue commands such as service brake and holding brake through the controller, and can also receive automatic brake commands from the on-vehicle signal system.

[0025] The second controller bypass switch and the driverless mode relay are connected in series to form a fault mitigation circuit, with both ends connected to the 110V DC power supply and the quick brake command train line respectively. It realizes bypass processing of the quick brake command issued when the controller fails and forcibly mitigates the quick brake.

[0026] The controller is powered by the vehicle's 110V DC power supply and is internally equipped with quick-acting switch contacts. The specific working principle is as follows: When the controller handle is operated to different gears, it drives the cams in different parts to rotate through the longitudinal axis, thereby controlling the opening or closing of the quick-acting switch contacts to output traction or brake commands; The quick-acting switch contacts corresponding to each gear are connected through connectors and cables to transmit high and low level signals to the traction and brake command train lines; The command sources of the traction and brake command train lines include the hard-wired command outputs of the controller and the signal system; When the vehicle is controlled by signals, the signal system gives commands; When the driver is manually driving, the controller gives commands; When the traction command train line is at a high level, it indicates that there is a traction command. When the brake command train line is at a low level, it indicates that there is a brake command; The quick brake command is only given by the driver operating the controller at the activation end in the manual driving mode, and the signal system does not output the quick brake command; When the brake control unit detects a low level signal transmitted on the quick brake command train line, it applies the quick brake. When the quick brake command is a high level signal, it mitigates the quick brake.

[0027] Embodiment 2: As Figure 2 shown, the present invention provides a method for mitigating train quick brake faults, including: Step S100: When the vehicle is in the driverless mode or the signals of the controller key and each gear of the control handle are all at a low level, the signal system issues a driver's cab activation command, and the driverless mode relay closes.

[0028] Specifically, first check the driverless mode switch on the train to determine whether the vehicle is set to the driverless mode; at the same time, the train control system will monitor the insertion state of the controller key and the position of its control handle, whether it is in the state of the key not inserted or the control handle in the "off" or "neutral" position.

[0029] After confirmation, the signal system will send a cab activation command to the train control system, which is sent to each relevant control unit through the train vehicle network. After receiving the cab activation command, the driverless mode relay is activated and closed.

[0030] Step S200: If the quick-acting switch contacts inside the controller fail and open, continuously output a quick braking command, then close the second controller bypass switch to bypass the faulty quick braking command and achieve forced release of the quick braking.

[0031] Specifically, the train control system continuously monitors the output signal from the controller. When the system detects that the quick braking command is continuously and abnormally activated, it will initially judge that there may be a fault inside the controller. The specific fault of the quick-acting switch contacts is confirmed by comparing the inconsistency between the actual driving state and the command output.

[0032] After confirming the fault of the quick-acting switch contacts inside the controller and continuously outputting the quick braking command, the train control system will start the bypass mechanism according to the operator's command and control the second controller bypass switch to close. After closing the second controller bypass switch, the quick braking command train line directly outputs a high level from the 110V DC power supply, realizing the bypass processing of the quick braking command and relieving the quick braking.

[0033] In one embodiment, the method further includes: if the controller key or the internal quick-acting switch contacts fail and continuously output a quick braking command, cut off the power supply of the controller by disconnecting the first controller bypass switch, force the controller to go offline, change ends to the other end for driving operation or relieve the quick braking through the driverless mode.

[0034] Specifically, after confirming the controller fault and continuously outputting the quick braking command, disconnect the first controller bypass switch to cut off the power supply of the controller. After disconnecting the switch, the controller will lose power supply, and all functions related to driving operations will be disabled, realizing the forced offline of the controller at this end.

[0035] After the controller is powered off and forced to go offline, if the train is in a safe position and conditions permit, change ends to the controller at the other end for driving operation; if the train is approaching the terminal station or meets the conditions for running in the driverless mode, switch to the driverless mode.

[0036] If changing ends for driving, first confirm the status of the controller at the other end, then insert the key and start the controller, and finally check whether each system of the train is normal.

[0037] If choosing to switch to the driverless mode, close the second controller bypass switch, and the quick braking command train line directly outputs a high level from the 110V DC power supply, realizing the bypass processing of the quick braking command and relieving the quick braking.

[0038] Embodiment 3: The present invention provides a computer program product, which includes a mitigation program for train rapid braking failure to implement the mitigation method for train rapid braking failure provided in the above embodiments.

[0039] In one embodiment, the control logic of the program further includes: when the controller contact fails and the rapid braking cannot be mitigated by upgrading to the driverless mode, the program automatically downgrades to the emergency traction mode to mitigate the rapid braking. When the brake control unit detects that the vehicle is in the emergency traction mode, it ignores the hardwired command of the rapid braking and only performs operations according to the current braking command and the braking hardwired level.

[0040] Specifically, when the system detects that the controller contact fails and the rapid braking cannot be mitigated by other means, the system will activate the emergency response mechanism and the operation mode of the train will be downgraded to the emergency traction mode.

[0041] The emergency traction mode is a special operation mode designed for the train in case of specific failure situations. When serious failures occur in the main control system or key equipment of the train (including the controller, vehicle network, traction motor or braking system, etc.) and these failures cannot be quickly repaired or bypassed by conventional means, the emergency traction mode will be activated.

[0042] In the emergency traction mode, the train will temporarily bypass some complex control and safety systems and directly control the traction motor and braking system through hardwired connections. After entering the emergency traction mode, the brake control unit will ignore the conventional hardwired commands from the rapid braking system and instead only perform braking operations according to the current braking command issued by the driver through the brake handle or other emergency operation devices and the braking hardwired level. This design allows the train to be able to decelerate or stop when necessary while reducing unexpected braking caused by system failures.

[0043] In this embodiment, when the brake control unit detects that the train enters the emergency traction mode, the brake control unit will ignore all hardwired commands from the rapid braking system. In the emergency traction mode, the brake control unit will only perform braking operations according to the current braking command and the braking hardwired level.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these changes and modifications.

Claims

1. A train rapid braking fault relief circuit, characterized in that: including a brake command output circuit; The brake command output circuit includes a 110V DC power supply, a first driver controller bypass switch, a second driver controller bypass switch, a driver controller, an unmanned driving mode relay, an activation driver's cab relay, an on-board signal system, a traction control unit, a brake control unit and a vehicle network; The brake command output circuit also includes a fast brake command train line and a brake command train line; The 110V DC power supply is connected to the driver controller via the first driver controller bypass switch and the activation driver's cab relay in sequence; The rapid brake command train line connects the driver controller, the brake control unit, the vehicle network and the fault relief circuit; The brake command train line connects the driver controller, the on-board signal system, the traction control unit, the brake control unit and the vehicle network; The second driver controller bypass switch and the unmanned driving mode relay are connected in series to form a fault relief circuit, with the two ends connected to a 110V DC power supply and a rapid braking command train line respectively.

2. A method for alleviating a train rapid braking failure, characterized in that: include: When the vehicle is in unmanned driving mode or the driver controller key and the control handle are in low level, the signal system sends a driver's cab activation command and the unmanned driving mode relay is closed; If the quick-acting switch contacts inside the driver controller fail and disconnect, and the rapid braking command is continuously output, the bypass switch of the second driver controller will be closed to bypass the rapid braking command of the fault and realize the forced relief of rapid braking.

3. The method according to claim 2, characterized in that The internal quick-acting switch contact failures of the controller include idling position failures and forward position failures.

4. The method according to claim 2, characterized in that: The specific steps of the quick braking instruction for bypass fault include: Close the driverless mode relay; Close the bypass switch of the second controller; The rapid braking command train line directly outputs a high level from a 110V DC power supply to achieve bypass processing of the rapid braking command.

5. The method according to claim 2, characterized in that: The method further comprises: If the driver controller key or the internal quick-acting switch contacts fail, rapid braking commands will be continuously output, and the driver controller will be powered off by disconnecting the first driver controller bypass switch. The driver controller will be forced offline and the other end will be switched for driving operations or the unmanned driving mode will be used to alleviate rapid braking.

6. A computer program product, characterized in that The computer program product comprises a mitigation program for a train rapid braking failure, and when the program is executed by a processor, the method according to any one of claims 2 to 5 is implemented.

7. The program product according to claim 6, characterized in that The mitigation program is placed in the brake control unit and is used to automatically downgrade to the emergency traction mode to alleviate rapid braking when the driver controller contacts fail and rapid braking cannot be alleviated by upgrading to the unmanned driving mode.

8. The program product according to claim 7, characterized in that When the brake control unit detects that the vehicle is in emergency traction mode, it ignores the hard-wired command for rapid braking and only performs operations according to the current braking command and the hard-wired braking level.

Images