Dual-current vehicle power supply conversion system and method, and vehicle and storage medium

Abstract

Provided in the present application are a dual-current vehicle power supply conversion system and method, and a vehicle and a storage medium, which are used for power supply conversion of a dual-current vehicle between a suburban railway and an urban rail. The system comprises: a detection unit, a conversion unit, a power supply unit and a central control unit, wherein the detection unit comprises a beacon detection module, a vehicle speed measurement module, a vehicle traveling time detection module and a vehicle power supply mode detection module; and the central control unit comprises an operation module, a first determination module, a second determination module and a storage module, the operation module being used for calculating a vehicle traveling mileage, the first determination module being used for determining whether a vehicle successfully detects each beacon, the second determination module being used for determining whether the vehicle reaches each beacon, and the storage module being used for storing distance information between two adjacent beacons and a beacon level classification mode. In the present application, level classification is performed on beacons in a conversion area, and the vehicle executes corresponding actions at beacons of different levels, thereby improving the reliability of alternating-current / direct-current power supply conversion for dual-current vehicles.

Description

A dual-current vehicle power supply conversion system, method, vehicle, and storage medium

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024106652680, filed on May 27, 2024, entitled "A Dual-Stream Vehicle Power Supply Conversion System, Method, Vehicle and Storage Medium", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of dual-current vehicles, and more particularly to a dual-current vehicle power supply conversion system, method, vehicle, and storage medium. Background Technology

[0004] With the increasing travel demands of the population, the continuous expansion of central cities, and the rapid development of urbanization, rail transit vehicles, as one of the most important modes of urban transportation, have gradually expanded their application from traditional intra-city use to inter-city use. Against this backdrop, a type of train that can operate between urban and rural areas—the urban rail transit train—has emerged. However, traditional urban rail transit vehicles use 1500V / 750V DC power supply, while urban rail transit uses 27.5KV / 25KV industrial frequency single-phase AC power supply, resulting in differences in current ratings and operating systems. Therefore, to further facilitate urban rail transit, a dual-current system vehicle has gradually appeared in recent years.

[0005] Dual-mode vehicles are equipped with both AC and DC power supply systems. When operating between suburban railways and urban rail transit, they can achieve fully automatic switching between AC and DC power supply through a power conversion system. In existing technologies, the track in the AC / DC switching area is typically divided into zones, and ground beacons are installed in each zone. Dual-mode vehicles trigger different actions based on the received ground beacon signals from different track zones to complete the automatic AC / DC switching. Some existing technologies propose simultaneously installing a marking system near the ground beacons to provide reliable identification for the driver. However, the triggering of the vehicle's power conversion actions by each ground beacon and the driver's manual identification are both subject to a degree of uncontrollability. Therefore, existing dual-mode vehicle power conversion systems suffer from low reliability. Unreliable beacon identification affects the vehicle's electrical equipment and operation, and in severe cases, may lead to major safety accidents.

[0006] Summary of the Invention

[0007] In view of this, the purpose of this application is to provide a dual-current vehicle power supply conversion system, method, vehicle, and storage medium, thereby improving the reliability of dual-current vehicle power supply conversion.

[0008] In a first aspect, embodiments of this application provide a dual-current vehicle power supply switching system.

[0009] The system includes: a detection unit, a switching unit, a power supply unit, and a central control unit;

[0010] The detection unit includes a beacon detection module, a vehicle speed detection module, a vehicle travel time detection module, and a vehicle power supply mode detection module. The beacon detection module is used to detect beacons to trigger the switching unit action. The vehicle speed detection module is used to measure the vehicle speed. The vehicle travel time detection module is used to detect the time it takes for the vehicle to pass each beacon. The vehicle power supply mode detection module is used to detect the power supply status of the vehicle.

[0011] The switching unit is used to switch the power supply unit of the vehicle;

[0012] The power supply unit includes a DC power supply module and an AC power supply module, and the power supply unit is connected to the detection unit and the switching unit respectively.

[0013] The central control unit includes a calculation module, a first judgment module, a second judgment module, and a storage module. The central control unit is connected to the detection unit and the switching unit, respectively. The calculation module is used to calculate the vehicle's mileage based on the vehicle's speed and the time it takes for the vehicle to pass each beacon. The first judgment module is used to determine whether the vehicle has successfully detected each beacon, and the second judgment module is used to determine whether the vehicle has reached each beacon. The storage module is used to store the distance information between two adjacent beacons and the beacon level classification mode, wherein the beacon level classification mode includes at least two beacon levels.

[0014] The beacon includes at least five beacons.

[0015] Preferably, the beacon level classification mode includes a first-level beacon, a second-level beacon, and a third-level beacon; the beacon detection module detects the first-level beacon, the second-level beacon, and the third-level beacon sequentially from front to back according to the vehicle's direction of travel.

[0016] Preferably, the first judgment module is connected to the beacon detection module, and the second judgment module is connected to the calculation module and the storage module respectively.

[0017] The system also includes an audio-visual prompting unit, which is connected to the detection unit and the central control unit respectively. The audio-visual prompting unit includes a sound prompting module, a light prompting module and a display screen module.

[0018] The system also includes a manual switching unit, which is connected to the detection unit and the central control unit respectively.

[0019] The detection unit also includes an image acquisition and recognition module, which is connected to the display screen module.

[0020] Secondly, embodiments of this application provide a dual-current vehicle power supply conversion method, the method being applied to the aforementioned dual-current vehicle power supply conversion system, the method comprising:

[0021] The method includes:

[0022] Step S1: Classify the five beacons in the power supply conversion area into different levels: beacon 1 is a first-level beacon, beacon 2 is a second-level beacon, and beacons 3, 4 and 5 are third-level beacons;

[0023] Step S2: When the vehicle arrives at the first-level beacon, the detection unit detects the first-level beacon, and the central control unit determines whether the first-level beacon has been successfully detected.

[0024] Step S21: If the vehicle successfully detects the first-level beacon, the central control unit begins calculating the vehicle's mileage Lm, and the vehicle continues driving; when the vehicle arrives at other beacons in sequence, the detection unit detects the other beacons in sequence, and the central control unit determines whether the other beacons were successfully detected.

[0025] Step S211: If the vehicle successfully detects the other beacons, then execute the second action, the third action, the fourth action, and the fifth action in sequence;

[0026] Step S212: If the vehicle fails to detect the other beacons, when the central control unit determines that the vehicle has arrived at the other beacons in sequence based on the vehicle's mileage Lm, it executes the second action, the third action, the fourth action, and the fifth action in sequence.

[0027] Step S22: When the vehicle fails to detect the first-level beacon, the vehicle continues to drive; when the vehicle reaches the second-level beacon, the detection unit detects the second-level beacon, and the central control unit determines whether the second-level beacon was successfully detected.

[0028] Step S221: If the vehicle successfully detects the second-level beacon, the second action is executed, and the central control unit starts calculating the vehicle's mileage Ln again; when the vehicle arrives at each of the third-level beacons in sequence, the detection unit detects each of the third-level beacons in sequence, and the central control unit determines in sequence whether each of the third-level beacons was successfully detected:

[0029] Step S2211: If the vehicle successfully detects each of the third-level beacons, then execute the third action, the fourth action, and the fifth action in sequence;

[0030] Step S2212: If the vehicle fails to detect each of the third-level beacons, when the central control unit determines that the vehicle has arrived at each of the third-level beacons in sequence based on the vehicle's mileage Ln, it executes the third action, the fourth action, and the fifth action in sequence.

[0031] The second action is as follows: the vehicle executes a coasting command, the vehicle's air conditioning load is reduced to 0, and the auxiliary contactor and traction contactor disconnect.

[0032] The third action specifically involves disconnecting the vacuum circuit breaker;

[0033] The fourth action specifically involves: the vehicle performing a secondary test on the conversion unit and the power supply unit, forcing the vacuum circuit breaker to open, and switching the AC / DC conversion switch to the AC power supply module or the DC power supply module;

[0034] The fifth action specifically includes: closing the vacuum circuit breaker, performing open or closed actions on the traction converter and traction transformer, and performing open or closed actions on the high-speed circuit breaker;

[0035] Step S3: The vehicle completes the power supply conversion.

[0036] Preferably, the fifth action further includes:

[0037] If the vehicle switches from a DC power supply module to an AC power supply module, the high-speed circuit breaker is disconnected, and the traction converter and traction transformer are closed. If the vehicle switches from an AC power supply module to a DC power supply module, the traction converter and traction transformer are disconnected, and the high-speed circuit breaker is closed.

[0038] Thirdly, embodiments of this application also provide a dual-current vehicle, the vehicle including the aforementioned dual-current vehicle power supply conversion system.

[0039] Thirdly, embodiments of this application also provide a storage medium that is computer readable and writable, and the storage medium is used to store the aforementioned dual-current vehicle power supply conversion method.

[0040] The beneficial effects that this application can achieve are:

[0041] The dual-current vehicle power supply conversion system, method, vehicle, and storage medium provided in this application, building upon existing dual-current vehicles located in AC / DC conversion zones, which automatically detect various beacons and execute corresponding actions for onboard electrical equipment upon successful detection, further classify the beacons beside the track in the AC / DC power supply conversion zone into different levels. By using first-level and second-level beacons as two starting points for calculating mileage, the system compares the distance between adjacent beacons (pre-stored) with the vehicle's mileage to determine whether the vehicle has reached each third-level beacon. Upon successful determination, the corresponding vehicle power supply conversion action at each beacon is executed. This overcomes the shortcomings of existing technologies where the vehicle's corresponding conversion function is affected and onboard electrical equipment is damaged when beacon detection fails. By utilizing first-level and second-level beacons to form a double insurance, the system ensures that even if the second-level beacon fails when the first-level beacon detection is successful, the vehicle can still normally execute the corresponding conversion action at the second-level beacon. Furthermore, even if the third-level beacon fails when the first-level and / or second-level beacon detection is successful, reliable conversion of high-voltage electrical equipment at each third-level beacon is guaranteed, thus improving the reliability of AC / DC power supply conversion in dual-current vehicles.

[0042] The dual-current vehicle power supply conversion system, method, vehicle, and storage medium provided in this application remind the driver to observe the switching status of the vehicle's high-voltage device in a timely manner by setting up an audible and visual prompt unit, so as to ensure that the vehicle automatically triggers the on-board switch or circuit breaker to perform corresponding actions when passing each beacon; at the same time, by setting up a manual conversion unit, the driver can manually control the system in the event of an automatic triggering fault, further ensuring the reliable conversion of the vehicle's AC and DC power supply.

[0043] The dual-current vehicle power supply conversion system, method, vehicle, and storage medium provided in this application acquire and recognize textual prompts at each beacon using an image acquisition and recognition module, and facilitate driver viewing via a display module. This overcomes the limitation that drivers cannot clearly see textual prompts under special weather conditions, ensuring reliable monitoring by the driver and guaranteeing the reliability of AC / DC power supply conversion in the vehicle.

[0044] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 shows a logic block diagram of a dual-current vehicle power supply conversion system according to an embodiment of this application;

[0047] Figure 2 shows a schematic diagram of the conversion from DC power supply area to AC power supply area in a dual-current vehicle power supply conversion system according to an embodiment of this application.

[0048] Figure 3 shows a schematic diagram of the conversion from AC power supply area to DC power supply area in a dual-current vehicle power supply conversion system according to an embodiment of this application.

[0049] Figure 4 shows a high-voltage circuit topology of a dual-current vehicle power supply conversion system according to an embodiment of this application.

[0050] Figure 5 shows a flowchart of a conversion method for a dual-current vehicle power supply conversion system according to an embodiment of this application. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. Based on the embodiments of this application, every other embodiment obtained by those skilled in the art without inventive effort falls within the scope of protection of this application.

[0053] Example 1

[0054] Figure 1 shows a logic block diagram of a dual-current vehicle power supply conversion system provided in Embodiment 1 of this application. The system includes: a detection unit, a conversion unit, a power supply unit, and a central control unit.

[0055] The detection unit includes a beacon detection module, a vehicle speed detection module, a vehicle travel time detection module, and a vehicle power supply mode detection module;

[0056] When a dual-power vehicle travels between a suburban railway and an urban rail transit system, the vehicle uses AC power in the suburban railway and DC power in the urban rail transit system. To facilitate the switching of the vehicle's power supply unit, an automatic switching zone is set up at the junction of the suburban railway and the urban rail transit system. Beacons are buried in sections along the track in this switching zone. When the vehicle passes each beacon, the beacon detection module uses an electromagnetic induction device to detect the beacon. When the detection is successful, the vehicle is triggered to automatically perform the corresponding action to smoothly complete the switching of the power supply unit.

[0057] When a dual-flow vehicle travels between various beacons in the switching zone, the vehicle speed is measured by the vehicle speed detection module. Specifically, the vehicle detects the travel distance according to a fixed period T and obtains the vehicle speed through calculus. The period T is 15ms-25ms, preferably 20ms.

[0058] The vehicle travel time detection module is used to detect the time when the vehicle passes each beacon and transmit multiple time point data to the central control unit. The system then calculates the travel time of the train between two adjacent beacons.

[0059] The vehicle power supply mode detection module is used to detect the current power supply status of the vehicle. Specifically, the vehicle is in DC power supply mode or AC power supply mode.

[0060] The conversion unit is used to convert the power supply unit of the vehicle. The conversion unit includes an AC / DC conversion switch, which is used to specifically select a DC power supply module or an AC power supply module.

[0061] The power supply unit includes a DC power supply module and an AC power supply module. When the vehicle is traveling on urban rail, the AC / DC conversion switch is electrically connected to the DC power supply module. When the vehicle is traveling on suburban railway, the AC / DC conversion switch is electrically connected to the AC power supply module.

[0062] The power supply unit is connected to the detection unit and the conversion unit respectively, so as to realize the detection unit's detection of the power supply mode and the conversion unit's selection and conversion of the power supply module;

[0063] The central control unit includes a computing module, a first judgment module, a second judgment module, and a storage module;

[0064] The central control unit is connected to the detection unit and the conversion unit respectively. When the beacon detection module of the detection unit detects that the vehicle passes through each beacon, the detection signal is transmitted to the central control unit, so that the central control unit controls the vehicle to automatically perform corresponding actions on the high and low voltage electrical appliances on the vehicle.

[0065] The calculation module is used to calculate the vehicle's mileage based on the vehicle's speed and the time it takes for the vehicle to pass each beacon;

[0066] The first judgment module is used to determine whether the vehicle has successfully detected each of the beacons. The beacon detection module transmits the signals detected by the train when it passes each beacon to the first judgment module. If the signal detection is successful, the first judgment module drives the vehicle to perform corresponding actions on the electrical appliances of each voltage level on the vehicle. If the signal detection fails, the vehicle cannot automatically perform corresponding actions on the electrical appliances of each voltage level on the vehicle.

[0067] The second judgment module is used to determine whether the vehicle has reached each beacon location; the storage module is used to store the distance information between two adjacent beacons and the beacon level classification mode. Specifically, the second judgment module is connected to the calculation module and the storage module respectively. The second judgment module obtains the vehicle's specific mileage data through the calculation module, and obtains the distance data between two adjacent beacons through the storage module. The second judgment module determines whether the vehicle has reached each beacon location by comparing the vehicle's specific mileage data with the distance data between two adjacent beacons.

[0068] The beacon level classification mode includes at least two beacon levels. Specifically, when each beacon is classified into a first-level beacon and a second-level beacon, on the one hand, when the vehicle successfully detects the first-level beacon and the second-level beacon respectively, the corresponding action is executed. On the other hand, when the vehicle successfully detects the first-level beacon but fails to detect the second-level beacon, the corresponding action can be executed normally when the second judgment module determines that the vehicle has arrived at each second-level beacon. Specifically, when each beacon is classified into a first-level beacon, a second-level beacon, and a third-level beacon, on the one hand, when the vehicle successfully detects the first-level beacon, the second-level beacon, and the third-level beacon respectively, the corresponding action is executed. On the other hand, when the vehicle successfully detects the first-level beacon or the second-level beacon but fails to detect the third-level beacon, the corresponding action can be executed normally when the second judgment module determines that the vehicle has arrived at each third-level beacon.

[0069] The beacon system comprises at least five beacons, as shown in Figures 2 and 3. In the direction the vehicle travels from the suburban railway to the urban rail or vice versa, beacons 1, 2, 3, 4, and 5 are arranged sequentially from front to back. Furthermore, the number of beacons located beside the track in the transition zone can also be seven or eight, depending on the precision of the power supply transition action and the level of indication required when the vehicle passes through the transition zone.

[0070] Figure 2 shows a schematic diagram of the DC power supply to AC power supply conversion system for a dual-current vehicle power supply system according to an embodiment of this application. The vehicle equipment needs to complete the following actions to switch from the DC power supply to the AC power supply:

[0071] When the vehicle receives ground beacon 1, the train is about to enter the switching zone, and the system begins to calculate the vehicle's mileage.

[0072] When the vehicle receives ground beacon 2, a coasting command is executed on the vehicle, the air conditioning load of the vehicle is reduced to 0, the auxiliary contactor and traction contactor are disconnected, and the system recalculates the vehicle's mileage.

[0073] Disconnect the vacuum circuit breaker when the vehicle receives ground beacon 3;

[0074] When the vehicle reaches beacon 4, the conversion unit and power supply unit are tested again, the vacuum circuit breaker is forced to open, and the AC / DC conversion switch is switched to AC power supply mode.

[0075] When the vehicle reaches beacon 5, the vacuum circuit breaker is closed, the traction converter and traction transformer are started, and the high-speed circuit breaker is disconnected, allowing the train to safely pass through the transfer zone.

[0076] Figure 3 shows a schematic diagram of the AC power supply to DC power supply conversion system for a dual-current vehicle in this embodiment of the present application. The vehicle equipment needs to complete the following actions when switching from AC power supply to DC power supply:

[0077] When the vehicle receives ground beacon 1, the vehicle is about to enter the transition zone, and the system begins to calculate the vehicle's mileage.

[0078] When the vehicle receives ground beacon 2, a coasting command is executed on the vehicle, the air conditioning load of the vehicle is reduced to 0, the auxiliary contactor and traction contactor are disconnected, and the system recalculates the vehicle's mileage.

[0079] Disconnect the vacuum circuit breaker when the vehicle receives ground beacon 3;

[0080] When the vehicle reaches beacon 4, the conversion unit and power supply unit are tested again, the vacuum circuit breaker is forced to open, and the AC / DC conversion switch is switched to DC power supply mode.

[0081] When the vehicle reaches beacon 5, the vacuum circuit breaker is closed, the traction converter and traction transformer are disconnected, and the high-speed circuit breaker is closed, allowing the train to safely pass through the transfer zone.

[0082] When the train passes ground beacon 2, the air conditioning load reduction and contactor disconnection actions are used to disconnect the high-load load on the train before the AC / DC operation is switched, so as to avoid damage to the high-load load caused by the power supply conversion.

[0083] Figure 4 shows a high-voltage circuit topology of a dual-current vehicle power supply conversion system according to an embodiment of this application. The high-voltage circuit includes a pantograph, a vacuum circuit breaker, an AC / DC transfer switch, a high-speed circuit breaker, a VVVF variable frequency speed control system, a traction converter, and a traction transformer. Under normal power supply conditions, the vacuum circuit breaker is closed. When the vehicle is in AC power supply mode, the AC / DC transfer switch is switched to the AC power supply module. At this time, the high-speed circuit breaker is open, and the traction converter and traction transformer are closed. When the vehicle is in DC power supply mode, the AC / DC transfer switch is switched to the DC power supply module. At this time, the high-speed circuit breaker is closed, and the traction converter and traction transformer are disconnected.

[0084] Figure 5 shows a flowchart of a conversion method for a dual-current vehicle power supply conversion system according to an embodiment of this application. The method includes:

[0085] Step S1: Classify the five beacons in the power supply conversion area into different levels, ensuring that each beacon is divided into at least two levels. Specifically, when using a five-beacon scheme, beacon 1 can be classified as a first-level beacon, beacon 2 as a second-level beacon, and beacons 3, 4, and 5 as third-level beacons; alternatively, beacon 1 can be classified as a first-level beacon, and beacons 2, 3, 4, and 5 as second-level beacons.

[0086] In traditional dual-current systems, when vehicles pass through AC / DC conversion areas, the beacons along the track are not classified. The vehicles rely solely on onboard detection devices to monitor each beacon. In this method, if a beacon is lost or the vehicle fails to detect it, the corresponding action will fail, affecting the reliability of the AC / DC power conversion, or even if the conversion is successful, it may damage the vehicle's electrical equipment. This application classifies the beacons along the track in the AC / DC conversion area into different levels, and performs different actions based on the beacon's level when the vehicle passes through.

[0087] Step S2: When the vehicle arrives at the first-level beacon, the detection unit detects the first-level beacon, and the central control unit determines whether the first-level beacon has been successfully detected.

[0088] Step S21: When the vehicle successfully detects the first-level beacon, the central control unit begins to calculate the vehicle's mileage Lm, and the vehicle continues to travel.

[0089] Step S22: When the vehicle fails to detect the first-level beacon, the vehicle continues to drive;

[0090] This application uses the first-level beacon as the initial starting point for calculating vehicle mileage. Successful positioning of the first-level beacon provides a first reference point for determining the positions of subsequent beacons. The first-level beacon can serve as a notification point for the vehicle entering the transition zone.

[0091] Regarding step S21, after the vehicle continues driving, when the vehicle arrives at other beacons in sequence, the detection unit sequentially detects the other beacons:

[0092] Step S211: If the vehicle successfully detects the other beacons, then execute the second action, the third action, the fourth action, and the fifth action in sequence;

[0093] Step S212: If the vehicle fails to detect the other beacons, when the central control unit determines that the vehicle has arrived at the other beacons in sequence based on the vehicle's mileage Lm, it executes the second action, the third action, the fourth action, and the fifth action in sequence.

[0094] Specifically, when the vehicle successfully detects the second-level beacon and / or the central control unit determines that the vehicle has reached the second-level beacon based on the mileage Lm, the second action is that the vehicle executes a coasting command, reduces the vehicle's air conditioning load to 0, and disconnects the auxiliary contactor and traction contactor.

[0095] When the vehicle successfully detects the third-level beacon and / or the central control unit determines that the vehicle has arrived at each of the third-level beacons based on the mileage Lm, the following actions are performed:

[0096] When the vehicle reaches beacon 3, the third action is to disconnect the vacuum circuit breaker.

[0097] When the vehicle reaches beacon 4, the fourth action is to perform a secondary test on the conversion unit and the power supply unit, force the vacuum circuit breaker to open, and switch the AC / DC conversion switch to the AC power supply module or the DC power supply module.

[0098] When the vehicle reaches beacon 5, the fifth action is to close the vacuum circuit breaker, perform open or closed actions on the traction converter and traction transformer, and perform open or closed actions on the high-speed circuit breaker, allowing the train to safely pass through the switching zone. Specifically, if the vehicle switches from a DC power supply module to an AC power supply module, the high-speed circuit breaker is opened, and the traction converter and traction transformer are closed; if the vehicle switches from an AC power supply module to a DC power supply module, the traction converter and traction transformer are opened, and the high-speed circuit breaker is closed.

[0099] Regarding step S22, after the vehicle continues driving, when the vehicle reaches the second-level beacon, the detection unit detects the second-level beacon, and the central control unit determines whether the second-level beacon has been successfully detected.

[0100] Step S221: If the vehicle successfully detects the second-level beacon, the corresponding action for the second-level beacon is executed, and the central control unit begins calculating the vehicle's mileage Ln; when the vehicle arrives at each of the third-level beacons in sequence, the detection unit detects each of the third-level beacons in sequence, and the central control unit determines in sequence whether each of the third-level beacons was successfully detected.

[0101] Step S2211: If the vehicle successfully detects each of the third-level beacons, then execute the third action, the fourth action, and the fifth action in sequence;

[0102] Step S2212: If the vehicle fails to detect each of the third-level beacons, then when the central control unit determines that the vehicle has arrived at each of the third-level beacons in sequence based on the vehicle's mileage Ln, it executes the third action, the fourth action, and the fifth action in sequence.

[0103] The corresponding actions for each Level 3 beacon are as described above and will not be repeated here.

[0104] Step S3: The vehicle completes the power supply conversion.

[0105] It should be noted that when the vehicle fails to detect both the first-level and second-level beacons, the vehicle continues to drive and detects subsequent third-level beacons. If the detection is successful, the vehicle automatically performs the corresponding action, which is the existing technology. If the detection fails, the vehicle may switch the AC / DC conversion switch under load, or the AC / DC switching may fail, both of which will cause damage to the vehicle's electrical equipment.

[0106] The second-level beacon is located after the first-level beacon in the vehicle's direction of travel. The second-level beacon serves two purposes: firstly, it prepares for the vehicle's power supply conversion; secondly, it serves as a second starting point for calculating the vehicle's mileage. Thus, when the vehicle fails to detect the first-level beacon, the mileage can be recalculated using the second-level beacon. In other words, a dual starting point is formed through the first and second-level beacons. If either the first or second-level beacon is successfully detected, it provides a reliable guarantee for the automatic switching action of the vehicle at subsequent third-level beacons, thereby improving the reliability of AC / DC power supply conversion in dual-current vehicles.

[0107] Specifically, the vehicle executes a coasting command via a power switch and switches to coasting mode, i.e., a no-power driving mode, at the second-level beacon.

[0108] When the vehicle fails to detect the second-level beacon, if the vehicle successfully detects the first-level beacon and the central control unit determines that the vehicle has reached the second-level beacon based on the mileage Lm, then the vehicle is given a coasting command, the vehicle's air conditioning load is reduced to 0, and the auxiliary contactor and traction contactor are disconnected.

[0109] When a vehicle fails to detect a second-level beacon, the power conversion system's storage module pre-stores the distance data between adjacent beacons. As the vehicle travels from a first-level beacon to a second-level beacon, the second judgment module calculates the vehicle's mileage using its speed and time information. By comparing the distance data with the mileage data, it determines whether the vehicle has reached the second-level beacon. This ensures that even if the vehicle fails to detect a second-level beacon, it can still reliably perform the corresponding power conversion action at that location.

[0110] Specifically, the distance between beacon 1 and beacon 2 is 80-120m, the distance between beacon 2 and beacon 3 is 180-220m, the distance between beacon 3 and beacon 4 is 100-140m, and the distance between beacon 4 and beacon 5 is 425-465m. The above distances can be adjusted according to the vehicle length and the terrain of the switching area.

[0111] It should be noted that after the vehicle successfully detects or determines that it has passed beacon 3 and performs the vacuum circuit breaker disconnection action, in order to ensure the reliability of power supply conversion, the vehicle performs a second detection and forcibly performs the circuit breaker disconnection action when it successfully detects or determines that it has passed beacon 4.

[0112] The disconnection of high-voltage equipment corresponding to the third-level beacon plays a decisive role in the successful switching of vehicle power supply. Therefore, the successful detection or location determination of the third-level beacon is crucial. This application, building upon the traditional method of automatically detecting each third-level beacon by the vehicle, further utilizes first-level and second-level beacons to form a double safety net. Specifically, when the vehicle successfully detects a first-level beacon, the distance Lm from the first-level beacon can be used to calculate whether the vehicle has reached each third-level beacon. Similarly, when the vehicle successfully detects a second-level beacon, the distance Ln from the second-level beacon can be used to calculate whether the vehicle has reached each third-level beacon. In other words, successful detection of both first-level and / or second-level beacons ensures reliable switching of electrical equipment at each voltage level at each third-level beacon, thereby improving the reliability of AC / DC power supply switching in dual-current vehicles.

[0113] Example 2

[0114] Based on the technical solution of Embodiment 1, the dual-current vehicle power supply conversion system further includes: an audible and visual prompt unit and a manual conversion unit;

[0115] The audible and visual warning unit is connected to the detection unit and the central control unit, respectively. The audible and visual warning unit includes an audible warning module and a visual warning module. When the beacon detection unit detects that the vehicle has passed each beacon and / or when the central control unit determines that the vehicle has arrived at each beacon, the driver's cab alerts the driver via the audible and visual warning modules to promptly observe the switching status of the vehicle's high-voltage devices. Furthermore, the visual warning module also includes indicator lights corresponding to the pantograph, vacuum circuit breaker, AC / DC transfer switch, high-speed circuit breaker, VVVF variable frequency drive system, traction converter, and traction transformer in the vehicle's high-voltage system, facilitating the driver's observation of the switching status of the vehicle's high-voltage devices.

[0116] The manual switching unit includes, but is not limited to, handles, buttons, and switches mounted on the driver's console in the cab. The manual switching unit can control the vehicle's high-voltage devices. When the cab reminds the driver that the vehicle has reached each beacon location through the sound and light prompt modules, and the vehicle fails to successfully perform the corresponding switching action at the beacon location, the driver can manually control the system to further ensure the reliable switching of the vehicle's AC / DC power supply.

[0117] Example 3

[0118] Based on the technical solutions of Embodiments 1 and 2, the detection unit of the vehicle power conversion system further includes an image acquisition and recognition module, and the audio-visual prompt unit further includes a display screen module. The image acquisition and recognition module is connected to the display screen module. Specifically, the image acquisition and recognition module is a photographic or video recording device. Text prompts are set at each beacon location on the side of the track in the AC / DC conversion area. On the one hand, the driver can observe each text prompt in the cab; on the other hand, when the vehicle arrives at each beacon, the image acquisition and recognition module can acquire and recognize the text prompts and display the corresponding text on the display screen for the driver to see. This overcomes the defect that the driver cannot see the text prompts clearly under special weather conditions, ensuring reliable monitoring by the driver and guaranteeing the reliability of the vehicle's AC / DC power conversion.

[0119] Example 4

[0120] This application also provides a dual-current vehicle, which includes any one of the dual-current vehicle power supply conversion systems in Embodiment 1, Embodiment 2, and Embodiment 3. The vehicle can also apply a dual-current vehicle power supply conversion method in Embodiment 1.

[0121] Example 5

[0122] This application also provides a storage medium that is computer readable and writable, and the storage medium is used to store a dual-current vehicle power supply conversion method according to Embodiment 1.

[0123] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0124] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0125] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

[0126] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions 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 this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A dual-flow vehicle power conversion system, characterized in that: the system comprises a detection unit, a conversion unit, a power supply unit, and a central control unit; the detection unit comprises a beacon detection module, a vehicle speed detection module, a vehicle travel time detection module, and a vehicle power supply mode detection module, the beacon detection module is used to detect beacons to trigger the conversion unit to act, the vehicle speed detection module is used to measure the vehicle speed, the vehicle travel time detection module is used to detect the time when the vehicle passes each beacon, and the vehicle power supply mode detection module is used to detect the power supply state of the vehicle; the conversion unit is used to convert the power supply unit of the vehicle; the power supply unit comprises a direct current power supply module and an alternating current power supply module, and the power supply unit is connected with the detection unit and the conversion unit respectively; the central control unit comprises an operation module, a first judgment module, a second judgment module, and a storage module, and the central control unit is connected with the detection unit and the conversion unit respectively; the operation module is used to calculate the travel distance of the vehicle according to the vehicle speed and the time when the vehicle passes each beacon, the first judgment module is used to judge whether the vehicle successfully detects each beacon, the second judgment module is used to judge whether the vehicle reaches each beacon, and the storage module is used to store the distance information between adjacent two beacons and a beacon grade division mode, and the beacon grade division mode comprises at least two beacon grades; the beacons comprise at least five beacons.

2. A dual-voltage vehicle power conversion system according to claim 1, wherein: the beacon grade division mode comprises first grade beacons, second grade beacons, and third grade beacons, and the detection of the first grade beacons, the second grade beacons, and the third grade beacons by the beacon detection module is in order from front to back according to the travel direction of the vehicle.

3. A dual-voltage vehicle power conversion system according to claim 2, wherein: the first judgment module is connected with the beacon detection module, and the second judgment module is connected with the operation module and the storage module respectively. 4.The dual-flow vehicle power conversion system according to claim 1, characterized in that: the system further comprises an audible and visual prompt unit, the audible and visual prompt unit is connected with the detection unit and the central control unit respectively, and the audible and visual prompt unit comprises a sound prompt module, a light prompt module, and a display screen module; the detection unit further comprises an image acquisition and recognition module, and the image acquisition and recognition module is connected with the display screen module. 5.The dual-flow vehicle power conversion system according to any one of claims 1-4, characterized in that: the system further comprises a manual conversion unit, and the manual conversion unit is connected with the detection unit and the central control unit respectively.

6. A dual-voltage vehicle power conversion system according to claim 5, wherein: the conversion unit comprises an AC-DC conversion switch. 7.A dual-flow vehicle power conversion method applied to the dual-flow vehicle power conversion system according to any one of claims 2-6, characterized in that: the method comprises: step S1: grade division is performed on five beacons in a power conversion area: beacon 1 is a first grade beacon, beacon 2 is a second grade beacon, and beacons 3, 4, and 5 are third grade beacons. Step S2: When the vehicle reaches the first level beacon, the first level beacon is detected by the detection unit, and the center control unit determines whether the first level beacon is successfully detected: Step S21: If the vehicle successfully detects the first level beacon, the center control unit starts to calculate the driving distance Lm of the vehicle, and the vehicle continues to drive; when the vehicle reaches other beacons in turn, the detection unit detects the other beacons in turn, and the center control unit determines whether the other beacons are successfully detected: Step S211: If the vehicle successfully detects the other beacons, the second action, the third action, the fourth action, and the fifth action are executed in turn; Step S212: If the vehicle fails to detect the other beacons, when the center control unit determines that the vehicle reaches the other beacons in turn through the driving distance Lm of the vehicle, the second action, the third action, the fourth action, and the fifth action are executed in turn; Step S22: When the vehicle fails to detect the first level beacon, the vehicle continues to drive; when the vehicle reaches the second level beacon, the second level beacon is detected by the detection unit, and the center control unit determines whether the second level beacon is successfully detected: Step S221: If the vehicle successfully detects the second level beacon, the second action is executed, and the center control unit starts to calculate the driving distance Ln of the vehicle again; when the vehicle reaches each third level beacon in turn, the detection unit detects each third level beacon in turn, and the center control unit determines whether each third level beacon is successfully detected in turn: Step S2211: If the vehicle successfully detects each third level beacon, the third action, the fourth action, and the fifth action are executed in turn; Step S2212: If the vehicle fails to detect each third level beacon, when the center control unit determines that the vehicle reaches each third level beacon in turn through the driving distance Ln of the vehicle, the third action, the fourth action, and the fifth action are executed in turn; The second action specifically refers to that the vehicle executes a coasting instruction, the vehicle air conditioner is unloaded to 0, the auxiliary contactor and the traction contactor execute a disconnection action; The third action specifically refers to that the vacuum circuit breaker is disconnected; The fourth action specifically refers to that the vehicle performs secondary detection on the conversion unit and the power supply unit, forces the vacuum circuit breaker to be disconnected, and converts the AC / DC conversion switch to the AC power supply module or the DC power supply module; The fifth action specifically refers to that the vacuum circuit breaker is closed, the traction converter and the traction transformer are executed to be disconnected or closed, and the high-speed circuit breaker is executed to be disconnected or closed; Step S3: The vehicle completes power supply conversion.

8. The dual-flow vehicle power supply conversion method according to claim 7, wherein: The fifth action further comprises: ​ If the vehicle switches from the DC power supply module to the AC power supply module, the high-speed circuit breaker is executed to perform an opening action, and the traction converter and the traction transformer are executed to perform a closing action; if the vehicle switches from the AC power supply module to the DC power supply module, the traction converter and the traction transformer are executed to perform an opening action, and the high-speed circuit breaker is executed to perform a closing action.

9. A dual-flow vehicle, characterized by: The dual-current vehicle power supply conversion system comprises a dual-current vehicle power supply conversion system according to any one of claims 1 to 6.

10. A storage medium characterized by: The storage medium is computer readable and writable, and is used for storing the dual-current vehicle power supply conversion method according to claim 7 or 8. The storage medium is computer readable and writable, and is used for storing the dual-current vehicle power supply conversion method according to claim 7 or 8.

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