Train bogie low-limit control system and control method thereof

Abstract

The invention discloses a train bogie low limit control system which is characterized in that a bogie runs on a running surface of a track through tires, and a low limit switch is arranged between the bogie and the running surface and is connected with the bogie; under the normal operation state of the train, a certain distance is kept between the low limit switch and the running surface; when the train breaks down, the height reduction value of the bogie exceeds the safety threshold value, and the low limiting switch makes contact with the walking face. The invention further discloses a control method of the control system. By adopting the technical scheme, the installation is simpler and more convenient, and the cost is reduced; the real-time responsiveness of the system to abnormal changes is improved, and potential hidden dangers can be found more timely; the fault probability of the system is reduced, and the stability and reliability of the whole system are improved; it is ensured that the system can take appropriate protection measures when abnormality is detected; and through a proper speed reduction strategy, the running stability is ensured, so that the tires are kept intact before reaching the next station.

Description

Technical Field

[0001] The present invention belongs to the field of safety technology of rail transit engineering. 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] At present, 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 1×10-9 or lower; this requires higher system reliability and safety;

[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 of the prior art has the following series of problems and defects:

[0006] 1. The tire pressure monitoring system of 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 probability of failure;

[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: The traditional system responds 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 bogie detection system function that meets advanced safety standards.

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

[0011] In order to reduce the potential risks caused by failures, the failure probability will be reduced by 10 times, so that the probability of both the tire pressure monitoring system and tire pressure abnormalities will reach 1×10-7. Although this reduces the possibility of failure, there may still be certain risks.

[0012] The following search results were obtained by searching the existing public technical literature using keywords such as "train; bogie; low limit; control":

[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 recorded 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, the two pairs of guide wheels are arranged on the front and rear sides of the frame, and along the moving direction 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] “Easy to install, adjustable auxiliary steering capability, small size, light weight, and convenient for straddle-type monorail vehicles to pass through curved lines”;

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

[0018] "A train bogie instability automatic control system and control method, the control system includes a control module, a bogie instability detection module, a speed detection module, and a braking module respectively connected to the control module; the bogie instability detection module is used to detect and send bogie state information to the control module; the speed detection module is used to detect and send train speed information to the control module; the braking module is used to brake the train according to the braking command of the control module. The control method presets multiple speed limit values, and divides them into different levels from high to low according to the size of the speed limit value, and the high-level speed limit value is greater than the low-level speed limit value; when the train bogie instability occurs, the train is braked to reduce one speed limit level to run";

[0019] The technical effects recorded are:

[0020] "It has the advantages of high 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 trains."

[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 prior art, such as "potential risks and safety hazards" caused by the lowering of the bogie due to tire blowout, "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 comprises the following steps: 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 running normally, a certain distance is maintained between the low limit switch and the running surface; when a train failure occurs 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 installed on the bogie through 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 arranged on each bogie, respectively arranged in front of and behind the tire, and symmetrically arranged according to the center of the circle in the horizontal direction of the tire.

[0028] Every three vehicles of the train form a group, including a front car, a middle car and a rear car; the normally closed switches of the low limit switches on one side of the two sides 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 burst-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 train bogie low limit control system, and its technical solution is:

[0033] When the train bogie low limit control system is triggered, the low level means that the bogie is too low fault is detected, and the high level means that the bogie is not too low fault is not 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 15km / 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 on-board signal system, the train management system displays the tire blowout signal to the train driver and crew on the driver's console;

[0037] When the on-board signal system detects a low bogie signal and performs rescue, the operator operates the train in either 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] The train management system, upon receiving the low bogie height signal from the onboard signal system, displays an indication of the alarm (flat tire) to the operator or driver on the driver's console;

[0040] The present invention adopts the above 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 failure probability of the system 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 the stability of operation through an appropriate speed reduction strategy to protect the tire from being damaged before reaching the next station. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The contents shown in the attached 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 the state of fault detection of the present invention;

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

[0045] Figure 4 It is a schematic diagram of electrical connection of the low limit switch of the present invention;

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

[0047] Figure 6 It is the overall circuit and structure schematic 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 markings in the figure are:

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

[0051] The specific implementation modes of the present invention are 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, to timely detect and deal with the low position fault of the bogie and ensure the safe operation of the train, the technical solution adopted by the present invention is:

[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 running normally, the low limit switch 7 maintains a certain distance from 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 with the running surface 3.

[0055] like Figure 6 The 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 real-time responsiveness of the system 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 abnormality 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 arranged in the low limit switch seat 14 and forms a sliding fit with the low limit switch seat 14; the roller 12 is arranged 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 2.

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

[0060] The two lower limit switches 6 are arranged on each bogie 1, respectively arranged in front of and behind the tire 2, and 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 breakpoint 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 the two sides 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 as a key input interface to the vehicle signaling system (VATC), 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 on-board signal system 10 of the front car and the rear car in each group of trains respectively; the on-board 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 signal systems send alarms to the train management system to ensure a timely response.

[0067] The tire 2 is also provided with a run-flat 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 train bogie low limit control system, and its technical solution is:

[0069] When the train bogie low limit control system is triggered, the low level means that the bogie is too low fault is detected, and the high level means that the bogie is not too low fault is not detected;

[0070] All low limit switches 7 are connected in series and connected to the onboard signal 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 15km / 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 on-board signal system 10, the train management system 11 displays the tire burst signal to the train driver and crew and the control personnel at the main control console on the driver's console;

[0074] When the on-board signal system 10 detects a low bogie signal and performs rescue, the operator operates the train in an ATO (autopilot) mode with limited speed or in a manual driving mode with 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] The train management system 11, upon receiving the low bogie height signal from the onboard signal system 10, displays an indication of a warning (flat tire) to the operator or driver on the driver's console;

[0077] When the on-board 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 2 The "Low Bogie Detection Train Line" shown provides important input to the On-Board Signaling System VATC-A and On-Board 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 at a low level, 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 (autopilot mode), the master VATC will reduce the vehicle's operating speed to 12km / 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 events of the train are 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 to be activated, the vehicle speed exceeds the 15km / h limit, which will also trigger emergency braking;

[0086] If VATC applies emergency brakes due to exceeding the low bogie detection speed limit, VATC can reset the emergency brakes through 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 get off or the train is withdrawn from operation; continued travel in ATO mode will be restricted;

[0088] VATC will 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 VATC from the train control bus and displays it on the alarm page;

[0090] In all operation modes, the train management system receives the "low bogie" alarm information provided by 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 bursts, 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 to ensure timely acquisition of key information and improve the real-time performance and sensitivity of the system. When the low limit switch detects an abnormality, the low bogie height detection system triggers a corresponding signal to accurately transmit the problem information, which helps to take necessary measures as soon as possible.

[0093] Secondly, when a tire blowout or low bogie height abnormality is detected, the system can respond quickly, reduce the train speed, and issue a stop command to effectively mitigate potential dangers; after the train line is triggered, the onboard signal system passes the train control bus;

[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 run-flat tire parameters and has adaptability to better adapt to different operating conditions;

[0095] Fourth, with height adjustment function, it can be flexibly adjusted during leveling and tire wear to maintain excellent performance. By adjusting the height, it can prevent false alarms and only trigger under low limit conditions.

[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 protection scope 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 (2), characterized in that: 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 (7) 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).

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 arranged in the low limit switch seat (14) and forms a sliding fit with the low limit switch seat (14); the roller (12) is arranged 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 (2).

3. The train bogie low limit control system according to claim 2 is characterized in that: The lower 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 arranged on each bogie (1), respectively arranged in front of and behind the tire (2), and symmetrically arranged in the horizontal direction according to the center of the tire (2).

5. The train bogie low limit control system according to claim 3 is characterized in that: 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 (6) on one side of the two sides of each group of vehicles are connected in series through a 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).

6. The train bogie low limit control system according to claim 5, characterized in that: The bogie low limit detection circuit (8) is also respectively connected to the on-board signal system (10) of the front vehicle and the rear vehicle in each group of vehicles; the on-board signal system (10) is connected to the train control bus (9).

7. The train bogie low limit control system according to claim 6, characterized in that: The train control bus (9) is connected to a train management system (11).

8. The train bogie low limit control system according to claim 1, characterized in that: All low limit switches (7) are connected in series and connected to the on-board signal system (10) as a key input interface, which sends an alarm to the train management system (11) through the train control bus (9) to ensure timely response.

9. The control method of the train bogie low limit control system according to any one of claims 1 to 8, 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, a bogie too low fault is not detected; If a tire blowout is detected, the speed will be reduced to below 15km / 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 on-board signal system (10), the train management system (11) displays a tire blowout signal to the train driver and passengers on the driver's console; When the on-board signal system (10) detects a low bogie signal and performs rescue, the operator operates the train in an automatic driving mode with limited speed or in a manual driving mode with limited speed.

10. The control method of the train bogie low limit control system according to claim 9, 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 control console.

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