A train bogie low limit control system and control method thereof

Abstract

The present invention discloses a train bogie low-limit control system. The bogie runs on a track running surface via tires. A low-limit switch is provided between the bogie and the running surface, connected to the bogie. During normal train operation, the low-limit switch maintains a certain distance from the running surface. When a train malfunctions and the bogie's height drops by a value exceeding a safety threshold, the low-limit switch contacts the running surface. The present invention also discloses a control method for the control system. The above-mentioned technical solution simplifies installation and reduces costs. The system's real-time responsiveness to abnormal changes allows for more timely detection of potential hazards. The system's failure probability is reduced, improving overall system stability and reliability. The system ensures that appropriate protective measures are taken when an abnormality is detected. An appropriate speed reduction strategy is employed to ensure operational stability, protecting the tires from damage before reaching the next station.

Description

Technical Field

[0001] The present invention belongs to the field of rail transit engineering safety technology. More specifically, the present invention relates to a train bogie low limit control system. The present invention also relates to a control method of the control system. Background Art

[0002] Currently, there are the following requirements for train tire blowout and tire pressure monitoring:

[0003] 1. Failure probability target: Due to the serious dangers that failures may bring, the failure probability of functions that mitigate such dangers needs to be set at 1×10 -9 or lower; this requires higher system reliability and security;

[0004] 2. Tire blowout probability assessment: During continuous operation, the probability of a tire blowout on a monorail train is estimated to be 1×10 -6 This highlights the importance of timely detection and response to abnormal tire pressure to prevent potential dangers and accidents.

[0005] The tire pressure monitoring system in the prior art has the following series of problems and defects:

[0006] 1. The tire pressure monitoring system in the existing train management system is a SIL-0 function, which means that its reliability in terms of safety and integrity is relatively low, and there are potential risks and safety hazards. The probability of system failure is high, and the existing tire pressure monitoring system has serious limitations in reducing the failure probability.

[0007] 2. Complex installation of bogie monitoring system: The installation of traditional bogie monitoring system is cumbersome and requires a lot of manpower and time;

[0008] 3. Insufficient real-time responsiveness of the system: Traditional systems respond slowly when detecting abnormal changes in bogie height;

[0009] 4. Lack of tire pressure monitoring system function: In the existing system, there is a lack of low-steering frame detection system function that meets advanced safety standards.

[0010] 5. Unstable operation at low bogie height: When the bogie height is abnormally reduced, the existing system fails to provide adequate safety protection measures.

[0011] In order to reduce the potential risk of failure, the failure probability will be reduced by 10 times, so that the probability of simultaneous abnormal tire pressure monitoring system and tire pressure will reach 1×10 -7 While this reduces the likelihood of failure, there may still be some risk.

[0012] Using keywords such as "train; bogie; low limit; control" to search existing public technical literature, the following search results were obtained:

[0013] 1. Chinese patent document: "A straddle-type monorail train bogie equipped with an auxiliary steering device", patent (application) number: 202110086659.3, the technical solution described is:

[0014] "A straddle-type monorail train bogie equipped with an auxiliary steering device comprises a frame, a drive shaft, a pair of running wheels, and two pairs of guide wheels. The frame is a U-shaped frame, the drive shaft is arranged in the middle of the frame, the pair of running wheels are arranged on the drive shaft and located in the middle of the frame, and the two pairs of guide wheels are arranged on the front and rear sides of the frame. Along the direction of movement of the bogie, the front and rear ends of the frame are respectively provided with a single traction rod and a passive steering auxiliary device for auxiliary steering. Compared with the bogie of a traditional straddle-type monorail train";

[0015] The technical effects recorded are:

[0016] "It is easy to install, has adjustable auxiliary steering capability, is small in size and light in weight, and is convenient for straddle-type monorail vehicles to negotiate curved routes";

[0017] 2. Chinese patent document: "A train bogie instability automatic control system and control method", patent (application) number: 201610167911.2, the technical solution described is:

[0018] "A train bogie instability automatic control system and control method, the control system comprising a control module, a bogie instability detection module, a speed detection module, and a braking module, each connected to the control module. The bogie instability detection module is used to detect and send bogie status information to the control module; the speed detection module is used to detect and send train speed information to the control module; and the braking module is used to brake the train according to the braking command of the control module. The control method presets multiple speed limits and divides them into different levels from high to low according to the speed limit values, with the higher speed limit values ​​being greater than the lower speed limit values. When the train bogie instability occurs, the train is braked to reduce the speed limit level."

[0019] The technical effects recorded are:

[0020] "It has the advantages of high degree of automation, fast response speed, no need for human intervention, and can quickly eliminate train bogie instability, improve the control accuracy of train bogie instability, and ensure safe operation of the train."

[0021] However, the technical solutions recorded in the above-mentioned public technical documents have not been able to solve the problems and defects of the existing technology, such as "potential risks and safety hazards" caused by the lowering of the bogie due to tire blowout, "cumbersome and complicated installation of the monitoring mechanism" and "untimely real-time responsiveness". Summary of the Invention

[0022] The invention provides a train bogie low limit control system, the purpose of which is to timely detect and deal with bogie low position faults to ensure safe operation of the train.

[0023] In order to achieve the above object, the technical solution adopted by the present invention is:

[0024] The train bogie low limit control system of the present invention is characterized in that the bogie runs on the running surface of the track via tires; a low limit switch is provided between the bogie and the running surface and connected to the bogie; when the train is operating normally, a certain distance is maintained between the low limit switch and the running surface; when a train malfunctions and the height drop of the bogie exceeds a safety threshold, the low limit switch contacts the running surface.

[0025] The low limit switch is fixedly mounted on the bogie via a low limit switch seat; the low limit switch is provided with a roller and an elastic telescopic rod; one end of the elastic telescopic rod is arranged in the low limit switch seat and forms a sliding fit with the low limit switch seat; the roller is arranged at the end of the elastic telescopic rod extending downward from the low limit switch seat, and its rolling direction is consistent with the rolling direction of the tire.

[0026] The low limit switch is provided with a normally closed switch contact.

[0027] Two low limit switches are provided on each bogie, respectively provided in front of and behind the tire, and symmetrically arranged along the horizontal direction of the tire.

[0028] Every three vehicles of the train form a group, including a front vehicle, a middle vehicle and a rear vehicle; the normally closed switches of the low limit switches on one side of each group of vehicles are connected in series through a bogie low limit detection circuit; the two ends of the bogie low limit detection circuit are respectively connected to the positive power supply line of the bogie low limit control system and the negative power supply line of the bogie low limit control system.

[0029] The bogie low limit detection circuit is also connected to the on-board signal system of the front vehicle and the rear vehicle in each group of vehicles respectively; the on-board signal system is connected to the train control bus.

[0030] The train control bus is connected to the train management system.

[0031] The tire is also provided with a puncture-proof tire.

[0032] In order to achieve the same invention purpose as the above technical solution, the present invention also provides a control method for the above-mentioned train bogie low limit control system, the technical solution of which is:

[0033] When the train bogie low limit control system is triggered, a low level indicates that a bogie low fault is detected, and a high level indicates that no bogie low fault is detected;

[0034] All low limit switches are connected in series and connected to the onboard signaling system as a key input interface, which sends alarms to the train management system through the train control bus to ensure timely response;

[0035] If a tire blowout is detected, the speed will be reduced to below 15 km / h and a command will be issued to detain the vehicle at the next stop;

[0036] After receiving the bogie height too low signal from the onboard signal system, the train management system displays the tire blowout signal to the train driver and crew on the driver's console;

[0037] When performing rescue after the onboard signal system detects a low bogie signal, the operator operates the train in the automatic driving mode with limited speed or the manual driving mode with limited speed.

[0038] When an alarm is required, the control method sends an alarm to the train management system via the train control bus (9) to ensure a timely response;

[0039] After receiving the low bogie height signal from the onboard signal system, the train management system displays the alarm (tire blowout) indication to the operator or driver on the driver's console;

[0040] The present invention adopts the above-mentioned technical solution to provide a simpler installation method to reduce costs; improve the real-time responsiveness of the system to abnormal changes and discover potential hidden dangers more promptly; reduce the probability of system failure and improve the stability and reliability of the entire system; ensure that the system can take appropriate protective measures when an abnormality is detected; and ensure operational stability through appropriate speed reduction strategies to protect the tires from being damaged before reaching the next stop. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The contents shown in the accompanying drawings and the symbols in the drawings are briefly described as follows:

[0042] Figure 1 This is a schematic diagram of a normal detection state of the present invention;

[0043] Figure 2 A schematic diagram of a state of fault detection according to the present invention;

[0044] Figure 3 This is a schematic diagram of the low limit switch structure of the present invention;

[0045] Figure 4 Schematic diagram of electrical connection of the low limit switch of the present invention;

[0046] Figure 5 This is a schematic diagram of the arrangement of the low limit switch of the present invention in front of and behind the tire;

[0047] Figure 6 It is the overall circuit and structural diagram of the present invention.

[0048] Among them, the low bogie detection train line is at a low level, indicating that a low bogie fault is detected, and a high level, indicating that no low bogie fault is detected.

[0049] The following are marked in the figure:

[0050] 1. Bogie, 2. Track, 3. Running surface, 4. Tire, 5. Run-flat tire, 6. Low limit switch, 7. Electrical connector, 8. Bogie low limit detection circuit, 9. Train control bus, 10. Vehicle-mounted signaling system (VATC), 11. Train management system, 12. Roller, 13. Elastic telescopic rod; 14. Low limit switch holder, 15. Positive power supply line for the bogie low limit control system, 16. Negative power supply line for the bogie low limit control system. DETAILED DESCRIPTION

[0051] The specific implementation methods of the present invention will be further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0052] like Figures 1 to 6 The structure of the present invention is a train bogie low limit control system to improve the safety, reliability and response speed of the system. The bogie 1 runs on the running surface 3 of the track 2 through the tires 2.

[0053] In order to solve the problems existing in the prior art and overcome its defects, realize the invention purpose of timely detecting and handling the low position fault of the bogie and ensuring the safe operation of the train, the technical solution adopted by the present invention is as follows:

[0054] like Figures 1 to 6 As shown, the train bogie low limit control system of the present invention is further provided with a low limit switch 6 connected to the bogie 1 between the bogie 1 and the running surface 3; when the train is operating normally, a certain distance is maintained between the low limit switch 6 and the running surface 3; when a train failure occurs and the height drop of the bogie 1 exceeds a safety threshold, the low limit switch 6 contacts the running surface 3.

[0055] like Figure 6The low bogie height detection system shown complies with SIL-2 level standards to ensure system safety integrity.

[0056] The above technical solution provides a simpler installation method and reduces costs; improves the system's real-time responsiveness to abnormal changes to detect potential problems more promptly; is committed to reducing the probability of system failure to improve the stability and reliability of the entire system; ensures that the system can take appropriate protective measures when an anomaly is detected; and ensures operational stability through appropriate speed reduction strategies to protect the tires from being damaged before reaching the next stop.

[0057] When the low limit switch hits the running surface, the low bogie height detection system can remain safe and intact; and the operation of the low bogie height detection system will not cause unacceptable additional risks.

[0058] The low limit switch 6 is fixedly mounted on the bogie 1 via a low limit switch seat 14; the low limit switch 6 is provided with a roller 12 and an elastic telescopic rod 13; one end of the elastic telescopic rod 13 is provided in the low limit switch seat 14 and forms a sliding fit with the low limit switch seat 14; the roller 12 is provided at the end portion of the elastic telescopic rod 13 extending downward from the low limit switch seat 14, and its rolling direction is consistent with the rolling direction of the tire 2.

[0059] The low limit switch 6 is provided with a normally closed switch contact.

[0060] The two lower limit switches 6 are provided on each bogie 1 , respectively provided in front of and behind the tire 2 , and are symmetrically arranged about the center of the tire 2 in the horizontal direction.

[0061] Each bogie is provided with a low limit switch at the front and rear. The mechanical break point of the low limit switch has an electrical auxiliary normally closed contact for detecting a tire blowout condition of a single running wheel.

[0062] Every three trains form a group, and the normally closed switches of the low limit switches 6 on one side of each side of each group of trains are connected in series through the bogie low limit detection circuit 8; the two ends of the bogie low limit detection circuit 8 are respectively connected to the bogie low limit control system power supply positive line 15 and the bogie low limit control system power supply negative line 16.

[0063] The auxiliary normally closed contacts of all low limit switches are connected in series and connected to the vehicle-mounted signaling system (VATC) as a key input interface, which sends alarms to the train management system through the train control bus to ensure timely response.

[0064] The bogie low limit detection circuit 8 is also connected to the onboard signal system 10 of the front car and the rear car in each train group respectively; the onboard signal system 10 is connected to the train control bus 9.

[0065] The train control bus 9 is connected to a train management system 11 .

[0066] Via the train control bus 9, these signalling systems send alarms to the train management system to ensure a timely response.

[0067] The tire 2 is further provided with a puncture-proof tire 5 .

[0068] In order to achieve the same invention purpose as the above technical solution, the present invention also provides a control method for the above-mentioned train bogie low limit control system, the technical solution of which is:

[0069] When the train bogie low limit control system is triggered, a low level indicates that a bogie low fault is detected, and a high level indicates that no bogie low fault is detected;

[0070] All low limit switches 6 are connected in series and connected to the onboard signaling system 10 as a key input interface, which sends alarms to the train management system 11 through the train control bus 9 to ensure timely response;

[0071] If a tire blowout is detected, the speed will be reduced to below 15 km / h and a command will be issued to detain the vehicle at the next stop;

[0072] When the low bogie detection train line is triggered, a low level indicates that a low bogie fault is detected, and a high level indicates that a low bogie fault is not detected.

[0073] After receiving the bogie height too low signal from the onboard signal system 10, the train management system 11 displays the tire blowout signal to the train driver and crew and the control personnel at the main control console on the driver console;

[0074] When the onboard signal system 10 detects a low bogie signal and performs a rescue, the operator operates the train in an ATO (automatic driving) mode with a limited speed or a manual driving mode with a limited speed.

[0075] When an alarm is required, the control method sends an alarm to the train management system 11 via the train control bus 9 to ensure a timely response;

[0076] After receiving the low bogie height signal from the onboard signal system 10, the train management system 11 displays an indication of a warning (tire blowout) to the operator or driver on the driver's console;

[0077] When the onboard signal system 10 detects the alarm signal of the low bogie and performs rescue, the operator or driver operates the train in the ATO mode speed limit or the manual driving mode speed limit.

[0078] like Figure 2The “Low Bogie Detection Train Line” shown provides important input to the onboard signaling system VATC-A and the onboard signaling system VATC-B for monitoring the low bogie detection status.

[0079] The low bogie detection train line provides important input for the on-board signal system VATC-A and the on-board signal system VATC-B, and is used to monitor the low bogie detection status; a low level on the low bogie detection train line indicates that a low bogie is detected, and a high level indicates that a low bogie is not detected.

[0080] If a tire blowout is detected on any running wheel and the low bogie detection train line is low, the low bogie signal is triggered.

[0081] If a tire blowout is detected on any running wheel and the low bogie detection train line is low, the low bogie signal is triggered;

[0082] In ATO (autonomous driving mode), the master VATC will reduce the vehicle's operating speed to 12 km / h within 34 seconds;

[0083] In manual mode of ATO and ATP (Automatic Protection System) protection, if low bogie signal trigger is detected, emergency braking and overspeed event of the train is triggered:

[0084] First, if the vehicle speed fails to drop to 15km / h within 34 seconds (a margin of 3km / h is allowed above the 12km / h speed limit);

[0085] Second, when the low bogie signal is detected and the vehicle speed exceeds the 15km / h limit, emergency braking will also be triggered;

[0086] If the VATC applies the emergency brake due to exceeding the low bogie detection speed limit, the VATC can reset the emergency brake via a local or remote EB reset request and allow the train to continue to the next station; during this period, the 15km / h limit and overspeed detection will still be in operation;

[0087] In ATO mode, the VATC will maintain an operating speed of 12 km / h until the train reaches the next station and detains the train to allow passengers to disembark or the train is withdrawn from service; further travel in ATO mode will be restricted;

[0088] VATC will be Figure 6 When the "Low Bogie Detected Train Line" shown is high, the speed limit is stopped and the "Low Bogie Detected" alarm is reset.

[0089] In all operating modes, the train management system receives the "low bogie" alarm information provided by the VATC from the train control bus and displays it on the alarm page;

[0090] In all operating modes, the train management system receives the "low bogie" alarm information provided by the VATC from the train control bus and displays it on the alarm page. This implementation is designed to ensure timely detection and response to low bogie tire blowouts, thereby improving the safety and reliability of the train system.

[0091] like Figure 1 and Figure 2 As shown, the beneficial effects of the present invention are:

[0092] First, the low bogie height detection system monitors the status of the low limit switch in real time, ensuring timely access to critical information and improving the system's real-time performance and sensitivity. When the low limit switch detects an anomaly, the low bogie height detection system triggers a corresponding signal, accurately conveying the problem information and helping to take necessary measures early.

[0093] Secondly, when a tire blowout or abnormal low bogie height is detected, the system can respond quickly, reduce the train speed, and issue a stop command, effectively mitigating potential dangers; when the train line is triggered, the onboard signal system sends an alarm to the train management system via the train control bus to ensure timely response;

[0094] Third, the low limit switch can accurately detect the low limit by adjusting the height to avoid false alarms. It is developed based on the parameters of the run-flat tire and has adaptability to better adapt to different operating conditions.

[0095] Fourth, the height adjustment function allows for flexible adjustments during leveling and tire wear to maintain optimal performance. This height adjustment prevents false alarms and triggers only when the limit is low.

[0096] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A train bogie low limit control system, wherein the bogie (1) runs on a running surface (3) of a track (2) via tires (4); Its characteristics are: A low limit switch (6) is provided between the bogie (1) and the running surface (3) and is connected to the bogie (1); when the train is running normally, a certain distance is maintained between the low limit switch (6) and the running surface (3); when a train failure occurs and the height of the bogie (1) drops to a value exceeding a safety threshold, the low limit switch (6) contacts the running surface (3); Each of the three train vehicles forms a group, including a front vehicle, a middle vehicle, and a rear vehicle; the normally closed switches of the low limit switches (6) on one side of the two sides of each group of vehicles are connected in series via a bogie low limit detection circuit (8); the two ends of the bogie low limit detection circuit (8) are respectively connected to a bogie low limit control system power supply positive line (15) and a bogie low limit control system power supply negative line (16); The bogie low limit detection circuit (8) is also connected to the vehicle-mounted signal system (10) of the front vehicle and the rear vehicle in each group of vehicles; the vehicle-mounted signal system (10) is connected to the train control bus (9); The train control bus (9) is connected to a train management system (11); All low limit switches (6) are connected in series and connected to the onboard signaling system (10) as a key input interface, which sends alarms to the train management system (11) through the train control bus (9) to ensure timely response.

2. The train bogie low limit control system according to claim 1, characterized in that: The low limit switch (6) is fixedly mounted on the bogie (1) via a low limit switch seat (14); the low limit switch (6) is provided with a roller (12) and an elastic telescopic rod (13); one end of the elastic telescopic rod (13) is provided in the low limit switch seat (14) and forms a sliding fit with the low limit switch seat (14); the roller (12) is provided at the end of the elastic telescopic rod (13) extending downward from the low limit switch seat (14), and its rolling direction is consistent with the rolling direction of the tire (4).

3. The train bogie low limit control system according to claim 2, characterized in that: The low limit switch (6) is provided with a normally closed switch contact.

4. The train bogie low limit control system according to claim 2, characterized in that: Two low limit switches (6) are provided on each bogie (1), respectively provided in front of and behind the tire (4), and symmetrically arranged in the horizontal direction according to the center of the tire (4).

5. The control method of the train bogie low limit control system according to any one of claims 1 to 4, characterized in that: When the train bogie low limit control system is triggered, if the bogie low limit detection circuit (8) is at a low level, a bogie too low fault is detected; if the bogie low limit detection circuit (8) is at a high level, no bogie too low fault is detected; If a tire blowout is detected, the speed will be reduced to below 15 km / h and a command will be issued to detain the vehicle at the next stop; After receiving the bogie height too low signal from the onboard signal system (10), the train management system (11) displays a tire blowout signal to the train driver and crew on the driver's console; When the onboard signal system (10) detects a low bogie signal and performs a rescue, the operator operates the train in a manner of speed limiting in an automatic driving mode or speed limiting in a manual driving mode.

6. The control method of the train bogie low limit control system according to claim 5, characterized in that: When an alarm is required, the control method sends an alarm to a train management system (11) via a train control bus (9) to ensure a timely response; after receiving a low bogie height signal from an onboard signal system (10), the train management system (11) displays an alarm indication to an operator or driver on a driver's console.

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