Operation protection method and system for ultra-high-speed maglev train in vacuum environment of low-vacuum tube tunnel

Abstract

Disclosed in the present invention are an operation protection method and system for an ultra-high-speed maglev train in a vacuum environment of a low-vacuum tube tunnel. The method comprises: first, a vacuum tube monitoring system establishing an air diffusion model on the basis of the pressure and the airflow velocity in a vacuum tube; and then, on the basis of the air diffusion model, a central operation control system controlling an on-board operation control system by means of a zoned operation control system to control the operation state of a train. By using the method, safety risks caused by leakage in a low-vacuum tube tunnel are avoided, thereby realizing the safety protection for a train in a vacuum tube, greatly improving the operation reliability of the train in a vacuum environment, and ensuring the operation safety of the train.

Description

Ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection method and system Technical Field

[0001] The present invention belongs to the field of rail transportation, and in particular relates to a method and system for protecting ultra-high-speed maglev low-vacuum tunnel operation in a vacuum environment. Background Art

[0002] The low-vacuum tube maglev transportation system (high-speed train) is a disruptive, forward-looking strategic project. Once successfully developed, it will join aviation and high-speed rail in forming a truly world-class modern, three-dimensional, integrated transportation system. To maintain high-speed operation, the low-vacuum tube tunnel high-speed maglev train requires a low-vacuum system. Therefore, a vacuum tube control system is required to ensure that the vacuum tube remains below a certain pressure, thereby maintaining a vacuum state.

[0003] When high-speed trains operate at high speeds, air pressure and airflow are key factors influencing train operation, making monitoring of vacuum pipelines particularly important. As infrastructure for high-speed trains, vacuum pipelines are crucial for the safe operation of the train's mainline. Whether the vacuum pipelines are in a vacuum state affects the train's braking curve, movement authorization, and section occupancy status. Malfunctioning of valves, emergency doors, and vacuum pumps, or leaks in the pipelines, could endanger the operation of high-speed maglev trains.

[0004] Therefore, how to ensure the safety of train operation in low-vacuum tunnels is becoming an increasingly urgent technical problem to be solved.

[0005] Summary of the Invention

[0006] In response to the above problems, the present invention discloses a method and system for protecting ultra-high-speed maglev low-vacuum tunnel operation in a vacuum environment, which improves the safety and reliability of train operation.

[0007] The purpose of the present invention is to provide a method for protecting ultra-high-speed magnetic levitation low-vacuum tunnel operation in a vacuum environment, comprising:

[0008] The vacuum pipe monitoring system establishes an air diffusion model based on the pressure and air flow rate in the vacuum pipe;

[0009] The central operation control system is based on the air diffusion model and controls the onboard operation control system through the partition operation control system to control the operating status of the train.

[0010] Furthermore, the vacuum pipe monitoring system establishes an air diffusion model based on the pressure and air flow rate in the vacuum pipe, including:

[0011] Based on the pressure change rate in the vacuum pipe, determine whether the current air in the vacuum pipe is in a steady state, where:

[0012] If the current air in the vacuum pipe is in a stable state, the running state of the train is determined based on the pressure and / or air flow rate in the vacuum pipe;

[0013] Otherwise, the running state of the train is determined based on the pressure change rate in the vacuum pipe.

[0014] Furthermore, the pressure change rate δP in the vacuum pipe satisfies: δP=(P1-P2) / t1-t2

[0015] Where P1 represents the pressure at time t1, and P2 represents the pressure at time t2;

[0016] When δP = 0, it means that the current air in the vacuum pipe is in a stable state;

[0017] When δP≠0, it means that the current air in the vacuum pipe is in an unstable state.

[0018] Furthermore, if the current air in the vacuum pipe is in a stable state, or the current air in the vacuum pipe is in an unstable state but 0<δP≤first pressure change rate, then determining the running state of the train according to the pressure and / or air flow rate in the vacuum pipe includes:

[0019] If the pressure P in the vacuum pipe is less than the first pressure, the running state of the train is related to the air flow velocity V in the vacuum pipe. 空气 The following relations are satisfied:

[0020] When V 空气 When the air velocity V1 is less than or equal to the first air velocity, the train runs at a normal speed;

[0021] When the first air flow rate V1<V 空气 When the second air flow velocity V2 is less than or equal to the second air flow velocity, the train runs at a speed lower than the first running speed;

[0022] When the second air flow rate V2<V 空气 When the third air flow velocity V3 is less than or equal to the third air flow velocity, the train runs at a speed lower than the second running speed;

[0023] When the third air flow rate V3<V 空气 When the fourth air velocity V4 is less than or equal to the fourth air velocity, the train lowers the support wheels to run;

[0024] When V 空气 >When the fourth air flow velocity V4 is reached, the train stops;

[0025] If the pressure P in the vacuum pipe ≥ the first pressure, the train travels at a normal operating speed.

[0026] Furthermore, if the air in the vacuum pipe is in an unstable state, but δP> the first pressure change rate, then based on the pressure change rate in the vacuum pipe, determining the running state of the train includes:

[0027] When the first pressure change rate < δP ≤ the second pressure change rate, the train lowers the support wheels to run;

[0028] When δP>the second pressure change rate, the train stops.

[0029] Furthermore, the central operation control system controls the onboard operation control system through the partition operation control system based on the air diffusion model to control the operation status of the train, including:

[0030] If V 空气 >The fourth gas flow rate V4 or δP>the second pressure change rate, the central operation control system sends a braking control instruction to the zone operation control system, and the zone operation control system controls the train to brake and stop through the on-board control system.

[0031] Furthermore, the central operation control system controls the onboard operation control system through the partition operation control system based on the air diffusion model to control the operation status of the train, and also includes:

[0032] If the first air flow rate V1<V 空气 ≤ the fourth air flow rate V4 or the first pressure change rate < δP ≤ the second pressure change rate, the central operation control system calculates the temporary speed limit and sends the temporary speed limit instruction and the calculated temporary speed limit to the zone operation control system;

[0033] The section operation control system controls the running status of the train through the on-board operation control system based on the temporary speed limit instruction and temporary speed limit.

[0034] Furthermore, the zoning operation control system controls the train's operating status through the onboard operation control system based on the temporary speed limit instruction and the temporary speed limit, including:

[0035] The zone operation control system obtains the suspension speed of the train through the onboard operation control system and determines whether the temporary speed limit of the train is lower than the suspension speed.

[0036] If the temporary speed limit is lower than the suspension speed, the zoning operation control system will control the train to lower its support wheels through the onboard operation control system. After the train's support wheels touch the ground, the train will pass through the speed restricted area at the temporary speed limit.

[0037] Otherwise, the section operation control system controls the train through the on-board operation control system to pass through the speed limit area at a suspended speed.

[0038] Furthermore, it also includes the vacuum pipeline monitoring system to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0039] The vacuum pipeline monitoring system sends operation status instructions to the partition operation control system;

[0040] The zone operation control system checks whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0041] If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump;

[0042] Otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0043] Furthermore, it also includes the central operation and control system to remotely operate the gate valve, pressure relief valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0044] The central operation control system sends operation status instructions to the partition operation control system;

[0045] The zone operation control system checks whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0046] If the train is in a stopped state, the central operation control system is allowed to remotely operate and control the gate valve, pressure relief valve, escape door and / or vacuum pump;

[0047] Otherwise, the central operation and control system is not allowed to remotely operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0048] Another object of the present invention is to provide an ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system, including a central operation control system, a partitioned operation control system, a vehicle-mounted operation control system, and a vacuum pipeline monitoring system. The central operation control system is connected to the partitioned operation control system and the vacuum pipeline monitoring system respectively, and the partitioned operation control system is also connected to the vacuum pipeline monitoring system and the vehicle-mounted operation control system respectively.

[0049] A vacuum pipe monitoring system is used to obtain the pressure and air flow rate in the vacuum pipe and establish an air diffusion model based on the pressure and air flow rate in the vacuum pipe;

[0050] The central operation control system is used to control the onboard operation control system through the partition operation control system to control the operating status of the train.

[0051] Furthermore, based on the pressure and air velocity in the vacuum pipe, an air diffusion model is established, including:

[0052] Based on the pressure change rate in the vacuum pipe, determine whether the current air in the vacuum pipe is in a steady state; wherein the pressure change rate δP in the vacuum pipe satisfies: δP=(P1-P2) / t1-t2

[0053] Where P1 represents the pressure at time t1, and P2 represents the pressure at time t2;

[0054] When δP=0, it means that the current air in the vacuum pipe is in a stable state. When δP≠0, it means that the current air in the vacuum pipe is in an unstable state.

[0055] If the current air in the vacuum pipe is in a stable state, or the current air in the vacuum pipe is in an unstable state, but 0<δP≤first pressure change rate, the running state of the train is determined according to the current pressure and / or air flow rate in the vacuum pipe, wherein,

[0056] If the pressure P in the vacuum pipe is less than the first pressure, the running state of the train is related to the air flow velocity V in the vacuum pipe. 空气 The following relations are satisfied:

[0057] When V 空气 When the first gas flow rate V1 is less than or equal to the first gas flow rate V1, the train runs at a normal speed;

[0058] When the first air flow rate V1<V 空气 When the second gas flow velocity V2 is less than or equal to the second gas flow velocity, the train runs at a speed lower than the first running speed;

[0059] When the second air flow rate V2<V 空气 When the third gas flow rate V3 is less than or equal to the third gas flow rate, the train runs at a speed lower than the second running speed;

[0060] When the third air flow rate V3<V 空气 When the fourth air velocity V4 is less than or equal to the fourth air velocity, the train lowers the support wheels to run;

[0061] When V 空气 >When the fourth gas flow rate V4 is reached, the train stops;

[0062] If the pressure P in the vacuum pipe is greater than or equal to the first pressure, the train runs at a normal speed;

[0063] If the current air in the vacuum pipe is in an unstable state, but δP> the first pressure change rate, the running state of the train is determined based on the pressure change rate in the vacuum pipe, where:

[0064] When the first pressure change rate < δP ≤ the second pressure change rate, the train lowers the support wheels to run;

[0065] When δP>the second pressure change rate, the train stops.

[0066] Furthermore, based on the air diffusion model, the onboard operation control system is controlled by the partition operation control system to control the operation state of the train, including:

[0067] If V 空气 > the fourth gas flow rate V4 or when δP > the second pressure change rate, the central operation control system sends a braking control instruction to the zone operation control system, and the zone operation control system controls the train to brake and stop through the on-board control system.

[0068] Furthermore, based on the air diffusion model, controlling the onboard operation control system through the partition operation control system to control the operation state of the train also includes:

[0069] If the first air flow rate V1<V 空气 ≤ the fourth air flow rate V4 or the first pressure change rate < δP ≤ the second pressure change rate, the central operation control system calculates the temporary speed limit and sends the temporary speed limit instruction and the calculated temporary speed limit to the zone operation control system;

[0070] The zone operation control system controls the train's operating status through the onboard operation control system based on the temporary speed limit instruction and temporary speed limit, specifically including:

[0071] The zone operation control system obtains the suspension speed of the train through the onboard operation control system and determines whether the temporary speed limit of the train is lower than the suspension speed.

[0072] If the temporary speed limit is lower than the suspension speed, the zoning operation control system will control the train to lower its support wheels through the onboard operation control system. After the train's support wheels touch the ground, the train will pass through the speed restricted area at the temporary speed limit.

[0073] Otherwise, the section operation control system controls the train through the on-board operation control system to pass through the speed limit area at a suspended speed.

[0074] Furthermore, the vacuum pipeline monitoring system is also used to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0075] The vacuum pipeline monitoring system sends operation status instructions to the partition operation control system;

[0076] The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0077] If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump;

[0078] Otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0079] Furthermore, the central operation control system is also used to remotely control the gate valve, re-pressure valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0080] The central operation control system sends operation status instructions to the partition operation control system;

[0081] The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0082] If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to remotely control the gate valve, re-pressure valve, escape door and / or vacuum pump;

[0083] Otherwise, the vacuum pipeline monitoring system is not allowed to remotely operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0084] Another object of the present invention is to provide an ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system, including a central operation control system, a partitioned operation control system, a vehicle-mounted operation control system, and a vacuum pipeline monitoring system. The central operation control system is connected to the partitioned operation control system and the vacuum pipeline monitoring system respectively, and the partitioned operation control system is also connected to the vacuum pipeline monitoring system and the vehicle-mounted operation control system respectively.

[0085] The vacuum pipe monitoring system includes an air diffusion calculation module, a control subsystem, an environmental perception subsystem, a gate valve, a re-pressure valve, an escape door, a vacuum pump, an air pressure sensor, and an air flow rate sensor. The air pressure sensor and the air flow rate sensor are respectively connected to the environmental perception subsystem and are respectively used to collect the pressure and air flow rate in the vacuum pipe. The air diffusion calculation module is connected to the environmental perception subsystem and is used to establish an air diffusion model based on the pressure and air flow rate in the vacuum pipe provided by the environmental perception subsystem. The control subsystem is connected to the gate valve, re-pressure valve, escape door, and vacuum pump in the vacuum pipe and is used to control the gate valve, re-pressure valve, escape door, and vacuum pump.

[0086] The central operation control system includes a temporary speed limit automatic calculation module and a global automatic emergency command module. The temporary speed limit automatic calculation module is connected to the global automatic emergency command module. The global automatic emergency command module is connected to the air diffusion calculation module of the vacuum pipeline monitoring system, and is used to obtain an air diffusion model and send the air diffusion model to the temporary speed limit automatic calculation module. The temporary speed limit calculation module is used to calculate the temporary speed limit based on the air diffusion model.

[0087] The zoning operation control system is used to control the operation status of the train through the on-board operation control system according to the control instructions issued by the central operation control system based on the air diffusion model.

[0088] Furthermore, the central operation and control system also includes a remote operation terminal for remotely operating and controlling the gate valve, the re-pressure valve, the escape door, and the vacuum pump.

[0089] Furthermore, the partitioned operation control system is also used to monitor the gate valve, re-pressure valve, escape door, and vacuum pump, and to perform permission confirmation before the central operation control system or control subsystem operates and controls the gate valve, re-pressure valve, escape door and / or vacuum pump.

[0090] When the protection method and system of the present invention protect the safe operation of the maglev train in a vacuum environment, the central operation control system uses the air diffusion model established by the vacuum pipe monitoring system to calculate the temporary speed limit, and controls the operating status of the train through the partition operation control system and the on-board operation control system, avoiding the safety risks brought by low-vacuum tunnel leakage, realizing the safety protection of the train in the vacuum pipe, greatly improving the reliability of the train operation in the vacuum environment, and ensuring the safety of the train operation.

[0091] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0093] FIG1 shows a schematic flow chart of a method for protecting ultra-high-speed maglev low-vacuum tunnel operation in a vacuum environment according to an embodiment of the present invention;

[0094] FIG2 shows a process diagram of a train performing temporary speed limit safety operation protection according to an embodiment of the present invention;

[0095] FIG3 shows another process diagram of a train performing temporary speed limit safety operation protection in an embodiment of the present invention;

[0096] FIG4 shows a process diagram of a train performing emergency braking for safe operation protection according to an embodiment of the present invention;

[0097] FIG5 shows a process diagram of another train emergency braking safety operation protection in an embodiment of the present invention;

[0098] FIG6 shows a structural diagram of a vacuum environment operation protection system for an ultra-high-speed maglev low-vacuum tunnel according to an embodiment of the present invention;

[0099] FIG7 shows a structural diagram of another ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system in an embodiment of the present invention. DETAILED DESCRIPTION

[0100] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0101] As shown in Figure 1, an embodiment of the present invention discloses a method for protecting the operation of an ultra-high-speed maglev low-vacuum tunnel in a vacuum environment. The method includes: first, the vacuum pipe monitoring system establishes an air diffusion model based on the pressure and air flow rate in the vacuum pipe; and the central operation control system controls the onboard operation control system through the partitioned operation control system based on the air diffusion model to control the operating status of the train. When protecting the safe operation of the maglev train in a vacuum environment, the central operation control system uses the air diffusion model established in the vacuum pipe monitoring system to control the onboard operation control system through the partitioned operation control system to control the operating status of the train, avoiding the safety risks brought about by leakage in the low-vacuum tunnel, thereby achieving safe protection for the train running in the vacuum pipe, greatly improving the reliability of the train operation in the vacuum environment, and ensuring the safety of the train operation.

[0102] The air diffusion model is the relationship between the pressure change rate in the vacuum pipe, the pressure and / or air flow rate in the vacuum pipe, and the train operation status. Furthermore, the air diffusion model is usually used when the vacuum pipe leaks or the gate valve is open. At the same time, the corresponding operation control system will also control the gate valve and other equipment in the vacuum pipe after the train stops. Specifically, first, the pressure change rate in the vacuum pipe satisfies: δP=(P1-P2) / t1-t2

[0103] Among them, P1 represents the pressure at time t1, and P2 represents the pressure at time t2.

[0104] Secondly, based on the pressure change rate in the vacuum pipe, determine whether the air in the vacuum pipe is currently in a steady state. When δP=0, it means that the air in the vacuum pipe is currently in a stable state; when δP≠0, it means that the air in the vacuum pipe is currently in an unstable state.

[0105] The air diffusion model specifically includes:

[0106] 1) When δP=0, it means that the current air in the vacuum pipe is in a steady state, or the current air in the vacuum pipe is in an unstable state, that is, δP≠0, but 0<δP≤first pressure change rate. At this time, if the pressure P in the vacuum pipe is less than the first pressure, as shown in Table 1: The running state of the train and the air flow rate V in the vacuum pipe 空气 The following relations are satisfied:

[0107] Table 1 Relationship between train running status and air flow velocity

[0108] In the table, V1, V2, V3, and V4 represent the first to fourth air flow rates, respectively, wherein the value of V1 can be 15 m / s (meters per second), the value of V2 can be 20 m / s, the value of V3 can be 25 m / s, and the value of V4 can be 30 m / s, but are not limited thereto. The values ​​of V1, V2, V3, and V4 can also be adaptively selected from other speed values. Furthermore, the normal speed of the train is a speed greater than or equal to 300 km / h (kilometers per hour). The normal speed of the train is a preset normal speed, such as 350 km / h, but is not limited thereto. Other preset normal speeds are also applicable to the present invention. The first operating speed can be 300 km / h, and the second operating speed can be 250 km / h, but are not limited thereto. The first operating speed and the second operating speed can also take other speed values ​​according to the train conditions. In addition, V1, V2, V3, and V4 can also be referred to as the leakage gas flow rate in the vacuum pipe.

[0109] When the air pressure P≥the first pressure, the train operation is not affected, that is, the train runs at a normal speed. The specific first pressure is 5000KPa (kilopascals), but is not limited thereto. For example, 4500KPa is also applicable to the present invention.

[0110] 2) When the air is currently in an unstable state but δP > the first pressure change rate, the following conditions are met:

[0111] When the first pressure change rate < δP ≤ the second pressure change rate, the air is currently unstable and the train lowers its support wheels to slide through. The first pressure change rate can be 50 Pa / h (Pascals per hour), but is not limited thereto. Depending on the environmental requirements within the vacuum pipe, a change of the first pressure change rate to 45 Pa / h is also applicable to the present invention.

[0112] When δP> the second pressure change rate, the train stops and is prohibited from running through the speed limit area. The second pressure change rate can be 100 Pa / h, but is not limited thereto. Depending on the environmental requirements in the vacuum pipeline, the first pressure change rate can be changed to 90 Pa / h, which is also applicable to the present invention.

[0113] In the embodiment of the present invention, the central operation control system controls the onboard operation control system based on the air diffusion model through the partition operation control system to control the operation state of the train, including controlling the train to brake and stop. 空气 >When the fourth gas flow rate V4 or δP > the second pressure change rate, it can be seen based on the air diffusion model that the running status of the train is the train stopping. Therefore, the central operation control system issues a braking control instruction to the zone operation control system according to the train running status requirements in the air diffusion model, and the zone operation control system controls the train to brake and stop through the on-board control system.

[0114] In the embodiment of the present invention, the central operation control system controls the onboard operation control system based on the air diffusion model to control the operation state of the train through the partition operation control system, and also controls the temporary speed limit of the train. Specifically, in the above air diffusion model, when the first air flow velocity V1<V 空气 ≤ the fourth air flow rate V4 or the first pressure change rate < δP ≤ the second pressure change rate, the train running state involves limiting the speed of the train, so that the first air flow rate V1 < V 空气 When the air velocity V4 is less than or equal to the fourth air velocity or the first pressure change rate is less than or equal to the second pressure change rate, the central operation control system calculates a temporary speed limit based on the air diffusion model, i.e., obtains a train speed that meets the requirements of the air diffusion model. The central operation control system then issues a temporary speed limit instruction and the calculated temporary speed limit to the zone operation control system.

[0115] The sectional operation control system controls the train's operating status through the onboard operation control system based on the issued temporary speed limit instruction and temporary speed limit. Specifically, the sectional operation control system obtains the train's suspension speed through the onboard operation control system and determines whether the train's temporary speed limit is lower than the suspension speed.

[0116] If the temporary speed limit is lower than the suspension speed, the zoning operation control system controls the train to lower the support wheels through the onboard operation control system. After the train support wheels land, the train passes through the speed limit area at the temporary speed limit, that is, if V1 < V 空气 ≤V2 or V2<V 空气 If V is less than or equal to V3, then during a temporary speed limit, the support wheels may be issued to allow the train to pass through the speed-restricted area at the temporary speed limit. Otherwise, as shown in the figure, the section operation control system controls the train through the speed-restricted area at a suspended speed via the onboard operation control system. For example, as shown in Figure 2, if the section operation control system determines that the train's temporary speed limit is lower than the suspended speed, the section operation control system issues a command to the onboard operation control system to lower the train's support wheels. The onboard control system then controls the train to lower the support wheels. After the support wheels land, the train passes through the speed-restricted area at the temporary speed limit. Otherwise, as shown in Figure 3, the section operation control system issues a command to the onboard operation control system to control the train through the speed-restricted area at a suspended speed. This dual protection method ensures the safety of train operation during temporary speed limits by comprehensively considering the air diffusion model and the suspended speed of high-speed trains. Furthermore, the protection distance in Figures 2 and 3, when the temporary speed limit is present, meets the distance required for the train to eventually slow down to the temporary speed.

[0117] In the embodiment of the present invention, when the speed of the train is less than 160 km / h or below, the support wheels must be lowered for operation.

[0118] By combining the air diffusion model with the train system operation control, the safety and reliability of train operation in the vacuum tube are effectively guaranteed.

[0119] In an embodiment of the present invention, a vacuum pump is used to evacuate the pipeline and maintain a low vacuum state; after the re-pressure valve is opened, the pipeline is connected to the outside world and the vacuum tube is injected with atmosphere; the gate valve is used to seal certain areas to prevent trains from entering; and the escape door is used for personnel escape. Therefore, the vacuum pipeline monitoring system also operates and controls the gate valve, re-pressure valve, escape door and / or vacuum pump, and requires permission from the zoning operation control system. Specifically, the vacuum pipeline monitoring system first sends an operation status instruction to the zoning operation control system; then, based on the operation status instruction, the zoning operation control system checks whether the train is in a stopped state through the on-board operation control system. Finally, if the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump; otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump. In order to ensure operational safety, the zoning operation control system must monitor the status of the gate valve, re-pressure valve, and escape door to prevent trains from entering the gate valve protection area or colliding with the gate valve, causing risks to the train, thereby further ensuring the safety of train operation. For example, as shown in Figures 4 and 5, when a train comes to a complete stop due to emergency braking, the vacuum piping system is permitted to operate the gate valve, re-pressure valve, escape door, and vacuum pump if the emergency stop has been completed. Otherwise, the vacuum piping system is prohibited from operating these valves. The protection distance in the figure represents the distance required for the train to come to a complete stop. Furthermore, these operations may be performed after emergency braking or a temporary speed limit to ensure train safety.

[0120] In an embodiment of the present invention, the method also includes the central operation control system remotely operating and controlling the gate valve, re-pressure valve, escape door and / or vacuum pump, and the permission of the partition operation control system is required, including: first, the central operation control system sends an operation status instruction to the partition operation control system; then, based on the operation status instruction, the partition operation control system checks whether the train is in a stopped state through the on-board operation control system. If the train is in a stopped state, the central operation control system is allowed to remotely operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump; otherwise, the central operation control system is not allowed to remotely operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump. Similarly, the above operation may be performed after emergency braking or temporary speed limit to ensure the safety of the train.

[0121] As shown in Figure 6, an embodiment of the present invention also introduces an ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system for executing the above method. The system includes a central operation control system, a partitioned operation control system, an on-board operation control system and a vacuum pipeline monitoring system. The central operation control system is connected to the partitioned operation control system and the vacuum pipeline monitoring system respectively. The partitioned operation control system is also connected to the vacuum pipeline monitoring system and the on-board operation control system respectively. The vacuum pipeline monitoring system is used to obtain the pressure and air flow rate in the vacuum pipeline, and establish an air diffusion model based on the pressure and air flow rate in the vacuum pipeline; the central operation control system is used to control the on-board operation control system through the partitioned operation control system to control the operating status of the train.

[0122] In the embodiment of the present invention, an air diffusion model is established based on the pressure and air flow rate in the vacuum pipe, wherein the air diffusion model is consistent with the description in the above method and will not be repeated here.

[0123] In the embodiment of the present invention, based on the air diffusion model, controlling the onboard operation control system through the partitioned operation control system to control the operation state of the train is consistent with the description of the above method and will not be repeated here.

[0124] In the embodiment of the present invention, the vacuum pipeline monitoring system is also used to operate and control the gate valve, the re-pressure valve, the escape door and / or the vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0125] The vacuum pipeline monitoring system sends operation status instructions to the partition operation control system;

[0126] The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0127] If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump;

[0128] Otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0129] In the embodiment of the present invention, the central operation control system is also used to remotely control the gate valve, the re-pressure valve, the escape door and / or the vacuum pump, and requires the permission of the partition operation control system, specifically including:

[0130] The central operation control system sends operation status instructions to the partition operation control system;

[0131] The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction.

[0132] If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to remotely control the gate valve, re-pressure valve, escape door and / or vacuum pump;

[0133] Otherwise, the vacuum pipeline monitoring system is not allowed to remotely operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

[0134] As shown in Figure 7, an embodiment of the present invention also introduces an ultra-high-speed magnetic levitation low-vacuum tunnel vacuum environment operation protection system capable of executing the above-mentioned protection method. The system includes a central operation control system, a partitioned operation control system, a vehicle-mounted operation control system (not shown in the figure), and a vacuum pipeline monitoring system. The central operation control system is respectively connected to the partitioned operation control system and the vacuum pipeline monitoring system. The partitioned operation control system is also respectively connected to the vacuum pipeline monitoring system and the vehicle-mounted operation control system. The vacuum pipeline monitoring system includes an air diffusion calculation module, a control subsystem, an environmental perception subsystem, a gate valve, a re-pressure valve, an escape door, a vacuum pump, an air pressure sensor, and an air flow rate sensor. The air pressure sensor and the air flow rate sensor are respectively connected to the environmental perception subsystem and are respectively used to collect the pressure and air flow rate in the vacuum pipeline. The air diffusion calculation module is connected to the environmental perception subsystem and is used to establish an air diffusion model based on the pressure and air flow rate in the vacuum pipeline provided by the environmental perception subsystem. The control subsystem is connected to the gate valve, re-pressure valve, escape door, and vacuum pump in the vacuum pipeline and is used to control the gate valve, re-pressure valve, escape door, and vacuum pump. Furthermore, the air diffusion model is often used when there is a leak in the vacuum line or when the gate valve is open.

[0135] The central operation control system includes a temporary speed limit automatic calculation module and a global automatic emergency command module. The temporary speed limit automatic calculation module is connected to the global automatic emergency command module. The global automatic emergency command module is connected to the air diffusion calculation module of the vacuum pipeline monitoring system, and is used to obtain an air diffusion model and send the air diffusion model to the temporary speed limit automatic calculation module. The temporary speed limit calculation module is used to calculate the temporary speed limit based on the air diffusion model.

[0136] The zoning operation control system is used to control the operation status of the train through the on-board operation control system according to the control instructions issued by the central operation control system based on the air diffusion model.

[0137] In the embodiment of the present invention, the central operation and control system further includes a remote operation terminal (not shown in the figure) for remotely operating and controlling the gate valve, the re-pressure valve, the escape door, and the vacuum pump.

[0138] In an embodiment of the present invention, the partitioned operation control system is also used to monitor the gate valve, re-pressure valve, escape door, and vacuum pump, and to perform permission confirmation before the central operation control system or the control subsystem operates and controls the gate valve, re-pressure valve, escape door and / or vacuum pump.

[0139] When the above-mentioned system protects the safe operation of the maglev train in a vacuum environment, the central operation control system uses the air diffusion model established by the vacuum pipe monitoring system to calculate the temporary speed limit, and controls the operating status of the train through the partition operation control system and the on-board operation control system, thereby achieving safe protection of the train in the vacuum pipe, avoiding the safety risks brought by low-vacuum tunnel leakage, greatly improving the reliability of train operation in a vacuum environment, and ensuring the safety of train operation.

[0140] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for protecting ultra-high-speed magnetic levitation low-vacuum tunnel from vacuum environment operation, characterized in that: include, The vacuum pipe monitoring system establishes an air diffusion model based on the pressure and air flow rate in the vacuum pipe; The central operation control system is based on the air diffusion model and controls the onboard operation control system through the partition operation control system to control the operating status of the train.

2. The vacuum environment protection method for ultra-high-speed maglev low-vacuum tunnel operation according to claim 1 is characterized in that: The vacuum pipe monitoring system establishes an air diffusion model based on the pressure and air flow rate in the vacuum pipe, including: Based on the pressure change rate in the vacuum pipe, determine whether the current air in the vacuum pipe is in a steady state, where: If the current air in the vacuum pipe is in a stable state, the running state of the train is determined based on the pressure and / or air flow rate in the vacuum pipe; Otherwise, the running state of the train is determined based on the pressure change rate in the vacuum pipe.

3. The vacuum environment protection method for ultra-high-speed maglev low-vacuum tunnel operation according to claim 2 is characterized in that: The pressure change rate δP in the vacuum pipe satisfies: δP=(P1-P2) / t1-t2 Where P1 represents the pressure at time t1, and P2 represents the pressure at time t2; When δP = 0, it means that the current air in the vacuum pipe is in a stable state; When δP≠0, it means that the current air in the vacuum pipe is in an unstable state.

4. The method for protecting the ultra-high-speed maglev low-vacuum tunnel from vacuum environment operation according to claim 3 is characterized in that: If the current air in the vacuum pipe is in a stable state, or the current air in the vacuum pipe is in an unstable state, but 0<δP≤first pressure change rate, then determining the running state of the train according to the pressure and / or air flow rate in the vacuum pipe includes: If the pressure P in the vacuum pipe is less than the first pressure, the running state of the train is related to the air flow velocity V in the vacuum pipe. 空气 The following relations are satisfied: When V 空气 When the air velocity V1 is less than or equal to the first air velocity, the train runs at a normal speed; When the first air flow rate V1<V 空气 When the second air flow velocity V2 is less than or equal to the second air flow velocity, the train runs at a speed lower than the first running speed; When the second air flow rate V2<V 空气 When the third air flow velocity V3 is less than or equal to the third air flow velocity, the train runs at a speed lower than the second running speed; When the third air flow rate V3<V 空气 When the fourth air velocity V4 is less than or equal to the fourth air velocity, the train lowers the support wheels to run; When V 空气 >When the fourth air flow velocity V4 is reached, the train stops; If the pressure P in the vacuum pipe ≥ the first pressure, the train travels at a normal operating speed.

5. The vacuum environment protection method for ultra-high-speed maglev low-vacuum tunnel operation according to claim 4 is characterized in that: If the air in the vacuum pipe is in an unstable state, but δP> the first pressure change rate, then based on the pressure change rate in the vacuum pipe, the running state of the train is determined to include: When the first pressure change rate < δP ≤ the second pressure change rate, the train lowers the support wheels to run; When δP>the second pressure change rate, the train stops.

6. The method for protecting ultra-high-speed maglev low-vacuum tunnel vacuum environment operation according to claim 5 is characterized in that: The central operation control system is based on the air diffusion model and controls the onboard operation control system through the partition operation control system to control the operation status of the train, including: If V 空气 >The fourth gas flow rate V4 or δP>the second pressure change rate, the central operation control system sends a braking control instruction to the zone operation control system, and the zone operation control system controls the train to brake and stop through the on-board control system.

7. The method for protecting the ultra-high-speed maglev low-vacuum tunnel from vacuum environment operation according to claim 5, characterized in that: The central operation control system is based on the air diffusion model and controls the onboard operation control system through the partition operation control system to control the operation status of the train. If the first air flow rate V1<V 空气 ≤ the fourth air flow rate V4 or the first pressure change rate < δP ≤ the second pressure change rate, the central operation control system calculates the temporary speed limit and sends the temporary speed limit instruction and the calculated temporary speed limit to the zone operation control system; The section operation control system controls the running status of the train through the on-board operation control system based on the temporary speed limit instruction and temporary speed limit.

8. The method for protecting the ultra-high-speed maglev low-vacuum tunnel from vacuum environment operation according to claim 7 is characterized in that: The zone operation control system controls the train's operating status through the onboard operation control system based on the temporary speed limit instruction and temporary speed limit, including: The zone operation control system obtains the suspension speed of the train through the onboard operation control system and determines whether the temporary speed limit of the train is lower than the suspension speed. If the temporary speed limit is lower than the suspension speed, the zoning operation control system will control the train to lower its support wheels through the onboard operation control system. After the train's support wheels touch the ground, the train will pass through the speed restricted area at the temporary speed limit. Otherwise, the section operation control system controls the train through the on-board operation control system to pass through the speed limit area at a suspended speed.

9. The method for protecting ultra-high-speed maglev low-vacuum tunnel operation in a vacuum environment according to any one of claims 1 to 8, characterized in that: It also includes the vacuum pipeline monitoring system to operate and control the gate valve, pressure relief valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including: The vacuum pipeline monitoring system sends operation status instructions to the partition operation control system; The zone operation control system checks whether the train is in a stopped state through the onboard operation control system based on the operation status instruction. If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump; Otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

10. The method for protecting ultra-high-speed maglev low-vacuum tunnel operation in a vacuum environment according to any one of claims 1 to 7, characterized in that: It also includes the central operation and control system to remotely operate the gate valve, pressure relief valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, specifically including: The central operation control system sends operation status instructions to the partition operation control system; The zone operation control system checks whether the train is in a stopped state through the onboard operation control system based on the operation status instruction. If the train is in a stopped state, the central operation control system is allowed to remotely operate and control the gate valve, pressure relief valve, escape door and / or vacuum pump; Otherwise, the central operation and control system is not allowed to remotely operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

11. An ultra-high-speed magnetic levitation low-vacuum tunnel vacuum environment operation protection system, characterized in that: It includes a central operation control system, a partition operation control system, a vehicle-mounted operation control system and a vacuum pipeline monitoring system. The central operation control system is connected to the partition operation control system and the vacuum pipeline monitoring system respectively. The partition operation control system is also connected to the vacuum pipeline monitoring system and the vehicle-mounted operation control system respectively. A vacuum pipe monitoring system is used to obtain the pressure and air flow rate in the vacuum pipe and establish an air diffusion model based on the pressure and air flow rate in the vacuum pipe; The central operation control system is used to control the onboard operation control system through the partition operation control system to control the operating status of the train.

12. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to claim 11 is characterized in that: Based on the pressure and air velocity in the vacuum pipe, the air diffusion model is established including: Based on the pressure change rate in the vacuum pipe, determine whether the current air in the vacuum pipe is in a steady state; wherein the pressure change rate δP in the vacuum pipe satisfies: δP=(P1-P2) / t1-t2 Where P1 represents the pressure at time t1, and P2 represents the pressure at time t2; When δP=0, it means that the current air in the vacuum pipe is in a stable state. When δP≠0, it means that the current air in the vacuum pipe is in an unstable state. If the current air in the vacuum pipe is in a stable state, or the current air in the vacuum pipe is in an unstable state, but 0<δP≤first pressure change rate, the running state of the train is determined according to the current pressure and / or air flow rate in the vacuum pipe, wherein, If the pressure P in the vacuum pipe is less than the first pressure, the running state of the train is related to the air flow velocity V in the vacuum pipe. 空气 The following relations are satisfied: When V 空气 When the first gas flow rate V1 is less than or equal to the first gas flow rate V1, the train runs at a normal speed; When the first air flow rate V1<V 空气 When the second gas flow velocity V2 is less than or equal to the second gas flow velocity, the train runs at a speed lower than the first running speed; When the second air flow rate V2<V 空气 ≤ the third gas flow rate V3, the train adopts a flow rate less than the third 2. Running speed; When the third air flow rate V3<V 空气 When the fourth air velocity V4 is less than or equal to the fourth air velocity, the train lowers the support wheels to run; When V 空气 >When the fourth gas flow rate V4 is reached, the train stops; If the pressure P in the vacuum pipe is greater than or equal to the first pressure, the train runs at a normal speed; If the current air in the vacuum pipe is in an unstable state, but δP> the first pressure change rate, the running state of the train is determined based on the pressure change rate in the vacuum pipe, where: When the first pressure change rate < δP ≤ the second pressure change rate, the train lowers the support wheels to run; When δP>the second pressure change rate, the train stops.

13. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to claim 12 is characterized in that: Based on the air diffusion model, the onboard operation control system is controlled by the partition operation control system to control the operation status of the train, including: If V 空气 > the fourth gas flow rate V4 or when δP > the second pressure change rate, the central operation control system sends a braking control instruction to the zone operation control system, and the zone operation control system controls the train to brake and stop through the on-board control system.

14. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to claim 13, characterized in that: Based on the air diffusion model, the onboard operation control system is controlled by the partition operation control system to control the operation status of the train, including: If the first air flow rate V1<V 空气 ≤ the fourth air flow rate V4 or the first pressure change rate < δP ≤ the second pressure change rate, the central operation control system calculates the temporary speed limit and sends the temporary speed limit instruction and the calculated temporary speed limit to the zone operation control system; The zone operation control system controls the train's operating status through the onboard operation control system based on the temporary speed limit instruction and temporary speed limit, specifically including: The zone operation control system obtains the suspension speed of the train through the onboard operation control system and determines whether the temporary speed limit of the train is lower than the suspension speed. If the temporary speed limit is lower than the suspension speed, the zoning operation control system will control the train to lower its support wheels through the onboard operation control system. After the train's support wheels touch the ground, the train will pass through the speed restricted area at the temporary speed limit. Otherwise, the section operation control system controls the train through the on-board operation control system to pass through the speed limit area at a suspended speed.

15. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to any one of claims 11 to 14, characterized in that: The vacuum pipeline monitoring system is also used to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, including: The vacuum pipeline monitoring system sends operation status instructions to the partition operation control system; The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction. If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to operate and control the gate valve, re-pressure valve, escape door and / or vacuum pump; Otherwise, the vacuum pipeline monitoring system is not allowed to operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

16. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to any one of claims 11 to 14, characterized in that: The central operation and control system is also used to remotely control the gate valve, pressure relief valve, escape door and / or vacuum pump, and requires the permission of the partition operation control system, including: The central operation control system sends operation status instructions to the partition operation control system; The partition operation control system is used to check whether the train is in a stopped state through the onboard operation control system based on the operation status instruction. If the train is in a stopped state, the vacuum pipeline monitoring system is allowed to remotely control the gate valve, re-pressure valve, escape door and / or vacuum pump; Otherwise, the vacuum pipeline monitoring system is not allowed to remotely operate and control the gate valve, pressure-recovering valve, escape door and / or vacuum pump.

17. An ultra-high-speed magnetic levitation low-vacuum tunnel vacuum environment operation protection system, characterized in that: It includes a central operation control system, a partition operation control system, a vehicle-mounted operation control system and a vacuum pipeline monitoring system. The central operation control system is connected to the partition operation control system and the vacuum pipeline monitoring system respectively. The partition operation control system is also connected to the vacuum pipeline monitoring system and the vehicle-mounted operation control system respectively. The vacuum pipeline monitoring system includes an air diffusion calculation module, a control subsystem, an environmental sensing subsystem, a gate valve, a re-pressure valve, an escape door, a vacuum pump, an air pressure sensor, and an air flow rate sensor, wherein the air pressure sensor and the air flow rate sensor are respectively connected to the environmental sensing subsystem. They are respectively used to collect the pressure and air flow rate in the vacuum pipeline. The air diffusion calculation module is connected to the environmental sensing subsystem and is used to establish an air diffusion model based on the pressure and air flow rate in the vacuum pipeline provided by the environmental sensing subsystem. The control subsystem is connected to the gate valve, re-pressure valve, escape door, and vacuum pump in the vacuum pipeline and is used to control the gate valve, re-pressure valve, escape door, and vacuum pump. The central operation control system includes a temporary speed limit automatic calculation module and a global automatic emergency command module. The temporary speed limit automatic calculation module is connected to the global automatic emergency command module. The global automatic emergency command module is connected to the air diffusion calculation module of the vacuum pipeline monitoring system, and is used to obtain an air diffusion model and send the air diffusion model to the temporary speed limit automatic calculation module. The temporary speed limit calculation module is used to calculate the temporary speed limit based on the air diffusion model. The zoning operation control system is used to control the operation status of the train through the on-board operation control system according to the control instructions issued by the central operation control system based on the air diffusion model.

18. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to claim 17, characterized in that: The central operation and control system also includes a remote operation terminal for remote operation and control of gate valves, pressure relief valves, escape doors, and vacuum pumps.

19. The ultra-high-speed maglev low-vacuum tunnel vacuum environment operation protection system according to claim 18, characterized in that: The partition operation control system is also used to monitor the gate valves, re-pressure valves, escape doors, and vacuum pumps, and to perform permission confirmation before the central operation control system or control subsystem operates and controls the gate valves, re-pressure valves, escape doors and / or vacuum pumps.

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