A ground automatic phase-shifting system and control method thereof

Abstract

The present invention relates to a ground automatic phase-shifting system and a control method thereof, comprising: a first phase-shifting switch, a second phase-shifting switch, a first infrared rangefinder, a second infrared rangefinder, a third infrared rangefinder, a position determination unit and a control unit; the position determination unit is used to determine the train position according to the distance measurement data of the first, second or third infrared rangefinder; the control unit is used to control the on and off of the first and second phase-shifting switches according to the train position, and the method is a control method for realizing phase-shifting for the above system. The present invention uses an infrared rangefinder to accurately identify the position of the train, avoiding the malfunction of the automatic phase-shifting system caused by frequent damage to the magnetic steel sensor and the cable when the magnetic steel sensor measures the train position.

Description

Technical Field

[0001] The invention relates to the technical field of overpower supply for electrified railways, and in particular to a ground automatic over-phase system and a control method thereof. Background Art

[0002] The electrified railway power supply system mostly adopts AC single-phase power frequency phase-changing power supply. In order to avoid phase-to-phase short circuit, a section of contact network with electrical segments at both ends is set at the exit of the traction substation and the partition booth, namely the neutral section (or electrical phase separation). The neutral section consists of a neutral area and anchor section joints at both ends. The neutral section isolates two adjacent electrical sections of the same line with different nominal voltages or phases. Since the neutral area contact network itself is not energized, special operations are required for on-board equipment or ground devices when the train passes. According to the operation mode of train over-phase, it can be divided into manual over-phase and automatic over-phase, and automatic over-phase can be further divided into automatic power-off over-phase on the train and automatic switching without power-off over-phase on the ground.

[0003] The traditional method for electric locomotives to pass through the electric phase-splitting area is manual operation by the driver. There is a "break / close" sign at a certain distance outside the power-free area. When the electric locomotive passes, the traction level must be returned to zero, the auxiliary unit must be turned off, and the main circuit breaker must be disconnected. After coasting through the power-free area, it must be restored item by item in the reverse order. In this way, the pantograph enters and exits the phase-splitting area without current, thereby ensuring the safety of the pantograph and the contact network. However, this operation method completely relies on the driver's manual operation, which poses a safety hazard. In high-speed railways (above 300km / h), due to the high train speed and the phase-splitting interval of about 30km, there is a phase-splitting area almost every 4 to 6 minutes, which greatly increases the driver's labor intensity; on the other hand, if the driver is slightly negligent, the locomotive has already traveled to the phase-splitting area before it has time to disconnect the main breaker, and the pantograph carries current into the phase-splitting, pulling arcs to burn the contact network or causing the traction substation to short-circuit and trip between phases. At present, most electrified railways use the method of automatic power-off during phase separation. The operation steps of this method are basically the same as the traditional manual operation of phase separation. The difference is that the train senses the position of the phase separation area and automatically performs the phase separation operation.

[0004] With the development of high-speed railways and heavy-load railways, excessive phase power outages are becoming increasingly incompatible with the needs of railways, which is mainly manifested in the following aspects.

[0005] (1) When the train is running at high speed, if there is no power supply in the phase separation area, it will lose traction. At the same time, due to the large wind resistance of the train at high speed, the speed of the train will drop significantly, which will greatly increase the average travel time of the train and make the train operation order unable to be guaranteed. On the other hand, after the high-speed train is powered off and passes through the phase separation, the speed decays greatly. In order to ensure the average travel time, the train must speed up after passing through the phase separation, but this speed recovery process consumes a lot of electricity, which is very uneconomical. Of course, it is also possible to increase the average running speed of the train by increasing the traction capacity to ensure the running time, but increasing the traction capacity will involve the entire EMU system such as pantographs, traction converters, traction transformers, insulation equipment, etc., which greatly increases the cost and technical difficulty, which is very uneconomical.

[0006] (2) A heavy-load train is pulled by multiple locomotives. When passing through phase separation, one of the locomotives runs without power, while the other locomotives run with power, resulting in uneven traction, which is extremely detrimental to the normal operation of the train. On mountain railways, the impact of power failure and phase separation is even more serious. When a low-speed heavy-load train runs in the phase separation area on an uphill slope, it loses traction and its speed gradually decreases until it stops in the neutral area. It must rely on a diesel locomotive to move the train to the power supply area and then rely on electric locomotives for traction again, which seriously affects the train's load capacity. In order to enable heavy-load trains to pass through the phase separation of mountain railways smoothly, the train's cargo capacity can be reduced, but this will inevitably affect the total freight volume, and thus affect the development of the national economy, so it is not feasible.

[0007] (3) Although the pantograph of the de-energized over-phase enters the neutral zone without current, arc discharge will still occur at the moment when the pantograph enters and leaves the neutral zone due to the approach and separation of the power supply arm and the non-power supply arm, resulting in overvoltage shock. In severe cases, overvoltages higher than 90kV may occur, causing the insulation gap on the roof to be broken, the contact network to be burned, and the traction substation to trip, seriously affecting the normal operation of the electrified railway. Although RC overvoltage absorption devices are installed in some phase-splitting areas, the devices passively withstand overvoltages rather than actively avoid overvoltages. At the same time, the devices are greatly affected by the weather, and the railway environment varies greatly, so the device has poor adaptability.

[0008] High-speed trains and heavy-load freight trains are developing rapidly, which puts forward new requirements for phase separation - automatic operation, fast phase change, and short-term power failure. The ground automatic phase separation can be switched by a switch, so that the locomotive can pass through the phase separation area with power, which can solve the above problems well.

[0009] As an important part of the ground automatic phase-passing device, train position detection provides the device with switch opening and closing criteria to ensure that the ground automatic phase-passing device operates according to normal logic, so that the train can safely and smoothly pass through the phase-passing area.

[0010] At present, the existing train position detection methods all use magnetic steel sensors buried under the rails for detection. However, the magnetic steel sensors have direct electrical contact with the locomotive and the rails, which may affect the normal operation of the existing locomotive system. In addition, the magnetic steel sensors are buried under the rails. Due to the long-term rolling of the locomotive, the life of the magnetic steel is short and the construction cost is high. The signal of the magnetic steel needs to be connected to the ground automatic phase-shifting device through a cable. Due to the long distance from the rails to the automatic phase-shifting device, the cable is exposed to wind and sun for a long time and often fails, resulting in frequent malfunctions of the automatic phase-shifting device. Summary of the invention

[0011] In view of the deficiencies in the prior art, the object of the present invention is to provide a ground automatic phase-changing system and a control method thereof, which can accurately obtain the position of the train and then precisely control the action of the phase-changing switch in the automatic phase-changing system.

[0012] The purpose of the present invention is achieved by adopting the following technical solutions:

[0013] The present invention provides a ground automatic phase-shifting system, the improvement of which lies in that the system comprises: a first phase-changing switch, a second phase-changing switch, a first infrared rangefinder, a second infrared rangefinder, a third infrared rangefinder, a position determination unit and a control unit;

[0014] The first and second phase-changing switches are arranged between the power supply arms on the train entry and exit sides and the midpoint of the neutral zone;

[0015] The first infrared rangefinder is set at a preset distance before the starting point of the phase separation zone, the second infrared rangefinder is set at the midpoint of the neutral zone, and the third infrared rangefinder is set at a preset distance after the ending point of the phase separation zone;

[0016] The position determination unit is used to determine the train position according to the ranging data of the first, second or third infrared rangefinder;

[0017] The control unit is used to control the on and off of the first or second phase-changing switch according to the train position.

[0018] Preferably, the position determination unit comprises:

[0019] A first acquisition submodule, used to acquire ranging data of the first, second or third infrared rangefinder;

[0020] The first judgment submodule is used to determine the difference between the first infrared rangefinder and the infrared rangefinder when the distance measurement data of the first infrared rangefinder changes from 2λ2 to When the train position is determined to be a preset distance before the starting point of the phase separation zone;

[0021] The second judgment submodule is used to determine the value of the second infrared rangefinder when the ranging data of the second infrared rangefinder changes from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone;

[0022] The third judgment submodule is used to determine when the distance measurement data of the third infrared rangefinder changes from 2λ2 to When the train position is determined to be a preset distance after the end point of the phase separation zone;

[0023] Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train.

[0024] Furthermore, the preset distance L is determined according to the following formula:

[0025] L=v c ·(t w +t k +t h )

[0026] In the formula, v c is the speed of the train, t w is the determination time of the position determination unit, t h is the communication time between the position determination unit and the control unit, t k It is the response time between the control unit and the first / second reversing switch.

[0027] Furthermore, a baffle is provided at each of the first, second and third infrared rangefinders at a symmetrical position relative to the centerline axis of the rail.

[0028] Preferably, spare infrared rangefinders are provided at the locations of the first, second and third infrared rangefinders, and each spare infrared rangefinder and the corresponding first, second and third infrared rangefinders are designed to be redundant.

[0029] Preferably, the control unit comprises:

[0030] A second acquisition submodule is used to acquire the train position sent by the position determination unit;

[0031] A first execution submodule is used to control the first phase-changing switch to be closed and the second phase-changing switch to be opened when the train position is a preset distance before the starting point of the phase-splitting zone;

[0032] A second execution submodule is used to control the first phase-changing switch to be opened and the second phase-changing switch to be closed when the train position is the midpoint of the neutral zone;

[0033] The third execution submodule is used to control the first phase-changing switch to be disconnected and the second phase-changing switch to be disconnected when the train position is a preset distance after the end point of the phase-splitting zone.

[0034] Furthermore, the initial working states of the first phase-changing switch and the second phase-changing switch are both disconnected.

[0035] The present invention provides a control method for the ground automatic phase transition system as claimed in any one of claims 1 to 7, wherein the improvement comprises:

[0036] Determine the train position according to the ranging data of the first, second or third infrared rangefinder;

[0037] The control unit is used to control the on and off of the first or second phase-changing switch according to the train position.

[0038] Preferably, the determining the train position according to the ranging data of the first, second or third infrared rangefinder comprises:

[0039] When the distance data received from the first infrared rangefinder changes from 2λ2 to When , the train position is determined to be the preset distance before the starting point of the phase separation zone;

[0040] When the distance data received from the second infrared rangefinder changes from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone;

[0041] When the third judgment submodule is used to receive the distance measurement data of the third infrared rangefinder from 2λ2 to When , the train position is determined to be the preset distance after the end point of the phase separation zone;

[0042] Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train.

[0043] Further, the controlling of the first or second phase-changing switch on and off according to the train position includes:

[0044] When the train position is at a preset distance before the starting point of the phase separation zone, the first phase change switch is controlled to be closed and the second phase change switch is opened;

[0045] When the train position is at the midpoint of the neutral zone, the first phase-changing switch is controlled to be opened and the second phase-changing switch is controlled to be closed;

[0046] When the train position is at a preset distance behind the end point of the phase separation zone, the first phase change switch is controlled to be disconnected and the second phase change switch is controlled to be disconnected.

[0047] Compared with the closest prior art, the present invention has the following beneficial effects:

[0048] The technical solution provided by the present invention is that the ground automatic phase-changing system includes: a first phase-changing switch, a second phase-changing switch, a first infrared rangefinder, a second infrared rangefinder, a third infrared rangefinder, a position determination unit and a control unit; the first / second phase-changing switch is arranged between the power supply arm on the train entry / exit side and the midpoint of the neutral zone; the first infrared rangefinder is arranged at a preset distance before the starting point of the phase-changing zone, the second infrared rangefinder is arranged at the midpoint of the neutral zone, and the third infrared rangefinder is arranged at a preset distance after the end point of the phase-changing zone; the position determination unit is used to determine the train position according to the distance measurement data of the first / second / third infrared rangefinder; the control unit is used to control the on and off of the first / second phase-changing switch according to the train position. The technical solution provided by the present invention uses the infrared rangefinder to accurately identify the position of the train, avoiding the malfunction of the automatic phase-changing system caused by frequent cable failure when the magnetic steel sensor measures the train position.

[0049] The technical solution provided by the present invention uses an infrared rangefinder instead of a magnetic steel sensor to measure the position of a train, thereby reducing the construction cost caused by frequent damage to the magnetic steel sensor and the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural diagram of a ground automatic over-phase system;

[0051] Figure 2 It is a schematic diagram of the position of the phase-changing switch in the ground automatic phase-changing system;

[0052] Figure 3 This is a diagram showing the position arrangement of infrared rangefinders in a ground-based automatic phase separation system. DETAILED DESCRIPTION

[0053] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 creative work are within the scope of protection of the present invention.

[0055] The present invention provides a ground automatic phase separation system, such as Figure 1 As shown, the system includes: a first phase-changing switch, a second phase-changing switch, a first infrared rangefinder, a second infrared rangefinder, a third infrared rangefinder, a position determination unit and a control unit;

[0056] The first and second phase-changing switches are arranged between the power supply arms at the train entry and exit sides and the midpoint of the neutral zone. Figure 2 As shown, phase A is the power supply arm on the train entry side, phase B is the power supply arm on the train exit side, K1 is the first phase-changing switch, and K2 is the second phase-changing switch; the basic principle of the ground automatic phase-splitting system is explained by taking the train running from left to right in the figure as an example. When the train runs on the phase A power supply arm and approaches the phase-splitting area, switch K1 is closed to make the neutral area carry phase A electricity. After the train passes the anchor section joint without power outage, there is still electricity in the neutral area. When the train passes the switching point of the neutral area, K1 is disconnected and K2 is closed, so that the neutral area changes from carrying phase A electricity to carrying phase B electricity. The train loses power for a very short time in this process and is almost unaffected. After the train leaves the anchor section joint, K2 is disconnected, and the neutral area returns to a non-powered state.

[0057] From the basic principle of the ground automatic phase-shifting system, it can be seen that accurately controlling the switching time of K1 and K2 and executing the correct switching command when the train runs to the appropriate position is the key to the correct and reliable operation of the system. Therefore, correct train position detection and timely sending of position information to the control system is one of the key technologies of the ground automatic phase-shifting system.

[0058] The present invention uses an infrared rangefinder to accurately measure the position of the train. The specific settings of the infrared rangefinder are as follows:

[0059] The first infrared rangefinder is set at a preset distance before the starting point of the phase separation zone, the second infrared rangefinder is set at the midpoint of the neutral zone, and the third infrared rangefinder is set at a preset distance after the ending point of the phase separation zone;

[0060] The position determination unit is used to determine the train position according to the ranging data of the first, second or third infrared rangefinder;

[0061] The control unit is used to control the on and off of the first or second phase-changing switch according to the train position.

[0062] Specifically, the position determination unit includes:

[0063] A first receiving submodule, used for receiving ranging data of the first, second or third infrared rangefinder, and sending the ranging data to the first judging submodule, the second judging submodule or the third judging submodule;

[0064] The first judgment submodule is used to receive the distance measurement data of the first infrared rangefinder from 2λ2 to When the train position is determined to be a preset distance before the starting point of the phase separation zone;

[0065] The second judgment submodule is used to receive the distance measurement data of the second infrared rangefinder from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone;

[0066] The third judgment submodule is used to receive the distance measurement data of the third infrared rangefinder from 2λ2 to When the train position is determined to be a preset distance after the end point of the phase separation zone;

[0067] Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train.

[0068] Furthermore, the preset distance L is determined according to the following formula:

[0069] L=v c ·(t w +t k +t h )

[0070] In the formula, v c is the speed of the train, t w is the determination time of the position determination unit, t h is the communication time between the position determination unit and the control unit, t k It is the response time between the control unit and the first / second reversing switch.

[0071] Specifically, a baffle is provided at each of the first, second and third infrared rangefinders at a symmetrical position relative to the center axis of the rail.

[0072] Specifically, spare infrared rangefinders are provided at the locations of the first, second and third infrared rangefinders, and each spare infrared rangefinder and the corresponding first, second and third infrared rangefinders are designed to be redundant.

[0073] In the preferred embodiment of the present invention, the distance data of the standby infrared rangefinder and any one of the corresponding first, second and third infrared rangefinders suddenly changes from 2λ2 to When

[0074] Specifically, the control unit includes:

[0075] A second receiving submodule, used for receiving a train position;

[0076] In the best embodiment of the present invention, the second receiving submodule is specifically used to receive the train position information determined by the first determining submodule, the second determining submodule or the third determining submodule;

[0077] A first execution submodule is used to control the first phase-changing switch to be closed and the second phase-changing switch to be opened when the train position is a preset distance before the starting point of the phase-splitting zone;

[0078] A second execution submodule is used to control the first phase-changing switch to be opened and the second phase-changing switch to be closed when the train position is the midpoint of the neutral zone;

[0079] The third execution submodule is used to control the first phase-changing switch to be disconnected and the second phase-changing switch to be disconnected when the train position is a preset distance after the end point of the phase-splitting zone.

[0080] Specifically, the initial working states of the first phase-changing switch and the second phase-changing switch are both disconnected.

[0081] The present invention provides a control method for a ground automatic phase-shifting system, comprising:

[0082] Determine the train position according to the ranging data of the first, second or third infrared rangefinder;

[0083] The control unit is used to control the on and off of the first or second phase-changing switch according to the train position.

[0084] Specifically, determining the train position according to the ranging data of the first, second or third infrared rangefinder includes:

[0085] When the distance data received from the first infrared rangefinder changes from 2λ2 to When , the train position is determined to be the preset distance before the starting point of the phase separation zone;

[0086] When the distance data received from the second infrared rangefinder changes from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone;

[0087] When the third judgment submodule is used to receive the distance measurement data of the third infrared rangefinder from 2λ2 to When , the train position is determined to be the preset distance after the end point of the phase separation zone;

[0088] Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train.

[0089] Further, the controlling of the first or second phase-changing switch on and off according to the train position includes:

[0090] When the train position is at a preset distance before the starting point of the phase separation zone, the first phase change switch is controlled to be closed and the second phase change switch is opened;

[0091] When the train position is at the midpoint of the neutral zone, the first phase-changing switch is controlled to be opened and the second phase-changing switch is controlled to be closed;

[0092] When the train position is at a preset distance behind the end point of the phase separation zone, the first phase change switch is disconnected and the second phase change switch is disconnected.

[0093] The train position detection method described in the present invention is applied to the phase separation area of ​​the overhead contact network of an electrified railway. Figure 3 As shown. Infrared rangefinders are installed at both ends and the middle area of ​​the phase separation zone. The specific location is 15m away from the anchor section joint before entering the phase separation zone (the train speed is 60km / h, the response time of the infrared rangefinder and the control system is about 1s, so the distance is set to 15m). Two infrared rangefinders A1 and B1 are installed, and two infrared rangefinders A2 and B2 are installed in the center of the neutral zone. After leaving the phase separation zone, two infrared rangefinders A3 and B3 are installed 15m away from the anchor section joint.

[0094] To ensure the reliability of train position detection, a redundant design method is adopted. The two sets of infrared rangefinders A / B serve as backup for each other and are connected to the train position identification unit at the same time. The infrared rangefinder is set at a distance of 4m from the center line of the rail and a height of 2m above the horizontal plane of the center of the rail. In addition, a corresponding metal baffle is set in the axial symmetry direction of each infrared rangefinder relative to the center line of the track. The infrared rangefinder is connected to the microprocessor MCU on site, and the MCU converts the distance data of the infrared rangefinder into an optical signal and transmits it to the train position identification unit in the form of serial communication.

[0095] When the neutral zone is in an idle state, that is, no train passes through the area, the distance measured by each infrared rangefinder is the distance from its installation position to the position of the symmetrical measuring baffle, that is, the distance parameter transmitted to the control system by the infrared rangefinder in the idle state is 8m (center distance of A / B~M / N).

[0096] The control principle of a ground automatic phase-passing system is as follows: take the train traveling from left to right as an example. When the locomotive head passes through the A1 and B1 infrared rangefinders, the light is blocked by the locomotive body. At this time, the infrared rangefinder measures the distance from its installation position to the body, which is about 2.2m (the distance from A / B to the locomotive shell close to the A / B side). After the data is transmitted to the train position identification unit, the train position identification unit determines that the position of the point has suddenly changed from 8m to 2.2m, thereby sensing that a train has passed. The train position identification unit sends a signal at a preset distance before the train reaches the starting point of the phase-passing zone to the control unit, and the control unit controls the first phase-changing switch to close and the second phase-changing switch to open; that is, the control unit issues a command to close the switch K1 of the ground automatic phase-passing device.

[0097] Similarly, when the locomotive front passes through the A2 and B2 infrared rangefinders, the train position identification unit receives the position data of this point, which changes suddenly from 8m to 2.2m, thereby sensing that a train has passed. The train position identification unit sends a signal that the train has reached the midpoint of the neutral zone to the control unit, and the control unit controls the first phase-changing switch to open and the second phase-changing switch to close; that is, the control unit issues the command to open K1 and close K2.

[0098] Finally, after the locomotive head passes through the A3 and B3 infrared rangefinders, the train position identification unit receives the data that the position of this point changes from 8m to 2.2m, thereby sensing that a train has passed. The train position identification unit sends a signal at a preset distance after the train reaches the end point of the phase separation area to the control unit. The control unit controls the first phase-changing switch to be disconnected. When the second phase-changing switch is disconnected, the control unit issues a K2 command, thereby completing the locomotive position detection and ensuring the normal operation of the ground automatic phase-changing device.

[0099] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0100] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A ground automatic phase separation system, characterized in that: The system comprises: a first phase-changing switch, a second phase-changing switch, a first infrared rangefinder, a second infrared rangefinder, a third infrared rangefinder, a position determination unit and a control unit; The first and second phase-changing switches are arranged between the power supply arms on the train entry and exit sides and the midpoint of the neutral zone; The first infrared rangefinder is set at a preset distance before the starting point of the phase separation zone, the second infrared rangefinder is set at the midpoint of the neutral zone, and the third infrared rangefinder is set at a preset distance after the ending point of the phase separation zone; The position determination unit is used to determine the train position according to the distance measurement data of the first, second or third infrared rangefinder; The control unit is used to control the first or second phase-changing switch to be turned on or off according to the train position; The position determination unit comprises: A first acquisition submodule, used to acquire ranging data of the first, second or third infrared rangefinder; The first judgment submodule is used to determine the difference between the first infrared rangefinder and the infrared rangefinder when the distance measurement data of the first infrared rangefinder changes from 2λ2 to When the train position is determined to be a preset distance before the starting point of the phase separation zone; The second judgment submodule is used to determine the value of the second infrared rangefinder when the ranging data of the second infrared rangefinder changes from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone; The third judgment submodule is used to determine when the distance measurement data of the third infrared rangefinder changes from 2λ2 to When the train position is determined to be a preset distance after the end point of the phase separation zone; Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train; The first, second and third infrared rangefinders are each provided with a baffle at a symmetrical position relative to the center axis of the rail.

2. The system according to claim 1, characterized in that The preset distance L is determined by the following formula: L=v c ·(t w +t k +t h ) In the formula, v c is the speed of the train, t w is the determination time of the position determination unit, t h is the communication time between the position determination unit and the control unit, t k It is the response time between the control unit and the first / second reversing switch.

3. The system according to claim 1, characterized in that A backup infrared rangefinder is provided at the location of the first, second and third infrared rangefinders, and each backup infrared rangefinder and the corresponding first, second and third infrared rangefinders are designed to be redundant.

4. The system according to claim 1, characterized in that The control unit comprises: A second acquisition submodule is used to acquire the train position sent by the position determination unit; A first execution submodule is used to control the first phase-changing switch to be closed and the second phase-changing switch to be opened when the train position is a preset distance before the starting point of the phase-splitting zone; A second execution submodule is used to control the first phase-changing switch to be opened and the second phase-changing switch to be closed when the train position is the midpoint of the neutral zone; The third execution submodule is used to control the first phase-changing switch to be disconnected and the second phase-changing switch to be disconnected when the train position is a preset distance after the end point of the phase-splitting area.

5. The system as claimed in claim 4, wherein the initial working states of the first phase-changing switch and the second phase-changing switch are both disconnected.

6. A control method for the ground automatic phase separation system according to any one of claims 1 to 5, characterized in that: include: Determine the train position according to the ranging data of the first, second or third infrared rangefinder; The control unit is used to control the on and off of the first or second phase-changing switch according to the train position.

7. The method according to claim 6, characterized in that The method of determining the train position according to the ranging data of the first, second or third infrared rangefinder comprises: When the distance data received from the first infrared rangefinder changes from 2λ2 to When , the train position is determined to be the preset distance before the starting point of the phase separation zone; When the distance data received from the second infrared rangefinder changes from 2λ2 to When , the train position is determined to be the midpoint of the neutral zone; When the third determination submodule is used to receive the distance measurement data of the third infrared rangefinder from 2λ2 to When , the train position is determined to be the preset distance after the end point of the phase separation zone; Among them, λ2 is the distance between the infrared rangefinder and the centerline axis of the rail, and β is the width of the train.

8. The method according to claim 7, characterized in that The controlling the first or second phase-changing switch on and off according to the train position comprises: When the train position is at a preset distance before the starting point of the phase separation zone, the first phase change switch is controlled to be closed and the second phase change switch is opened; When the train position is at the midpoint of the neutral zone, the first phase-changing switch is controlled to be opened and the second phase-changing switch is controlled to be closed; When the train position is at a preset distance behind the end point of the phase separation zone, the first phase change switch is controlled to be disconnected and the second phase change switch is controlled to be disconnected.

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