A rail transit vehicle air supply device adaptive variable frequency control method and system

Abstract

The application discloses a kind of rail transit vehicle air supply device adaptive variable frequency control method and system, the method includes the following steps: S1, using power supply for controller power supply, and selecting corresponding mode to complete motor power supply;S2, power supply is monitored by controller power supply power level state, selects corresponding input power supply;S3, after motor starts, controller controls motor to work in corresponding working mode according to pressure signal and start-stop signal fed back by pressure sensor;The system includes power supply module, monitoring selection module and control module.Based on the mainstream platform air supply device of the application, it can be generally adapted to the air demand of rail transit 3 to 8 marshalling vehicles, vehicle normal operating condition, can reduce exhaust volume to realize noise reduction energy saving, improve passenger comfort, while improving the working rate of compressor can effectively prevent the emulsification of lubricating oil, ensure the use reliability of air supply device life cycle;Vehicle preparation stage, quick air or total air leakage fault condition, can increase exhaust volume to improve vehicle availability, safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit vehicle braking and air supply technology, in particular to a rail transit vehicle air supply device adaptive variable frequency control method and system. BACKGROUND

[0002] The rail transit vehicle air supply device is used to provide compressed air for the normal operation of the on-board braking system and other air components. The existing rail transit vehicles generally use fixed displacement air supply devices. In order to ensure that the vehicle air storage cylinder pressure is maintained within a certain range (usually between 800kPa and 950kPa), the air supply device is intermittently started and stopped. According to the vehicle marshalling condition and the air consumption, the operation rate of the air supply device is generally between 10% and 80%, and the air consumption of the same vehicle will change at different stages of its life cycle. At the same time, the rail transit vehicle also needs to be equipped with an auxiliary air supply device, which provides compressed air as a gas source for the pantograph when the pressure of the main air storage cylinder is insufficient during vehicle operation preparation. The whole vehicle equipment configuration is complex, and the pipeline installation is complex.

[0003] At the same time, when the air supply device has a low operation rate, the lubricating oil cannot be quickly heated to above the dew point of the compressed air pressure, and liquid water will be produced and cannot be effectively evaporated every time the compressor starts. After a long time, lubricating oil emulsification will occur. When the air supply device has insufficient exhaust capacity and the operation rate is too high, only a large displacement air supply device with different platforms can be selected, resulting in insufficient adaptability and poor universality of the air supply device for one type of platform. The use of multiple fixed displacement air supply devices results in a large number of easily damaged and consumable parts and many types of faults, which is not conducive to the maintenance and repair of the operation and maintenance party. The three-phase asynchronous motor of the existing air supply device is directly started, and the starting current is about 7 times the rated current, which has a large impact on the power supply end and requires higher load capacity. The existing air supply device cannot output real-time power frequency, motor speed, power and exhaust pressure and other working parameters, and cannot realize the state monitoring of the air supply device.

[0004] At present, there is no effective solution to the problems in the related art. SUMMARY

[0005] In view of the problems in the related art, the present application proposes a rail transit vehicle air supply device adaptive variable frequency control method and system to provide clean and dry compressed air for rail transit vehicles, which can adapt to the scene adjustment of air volume, so as to overcome the above technical problems existing in the prior art.

[0006] To this end, the specific technical solutions adopted by the present application are as follows:

[0007] According to one aspect of the present application, a self-adaptive variable frequency control method for a rail transit vehicle air supply device, the method comprising the following steps:

[0008] S1, using a power supply to power the controller, and selecting a corresponding mode to complete motor power supply;

[0009] S2, monitoring the power supply level state of the power supply through the controller during power supply, and selecting a corresponding input power supply;

[0010] S3, after the motor is started, the controller controls the motor to work in a corresponding working mode according to the pressure signal and start-stop signal fed back by the pressure sensor.

[0011] Further, the power supply includes a 380V AC power supply, a 600V DC power supply, and a 110V DC power supply.

[0012] Further, the controller includes an input electromagnetic compatibility filtering module, an input three-phase rectification module, an isolation relay module, a pre-charge module, a power factor correction and voltage-boosting module, a three-phase inverter module, a voltage / current sampling module, a driving module, a communication module, and a control circuit module.

[0013] Further, the step of using a power supply to power the controller and selecting a corresponding mode to complete motor power supply includes the following steps:

[0014] S11, when the 380V AC power supply / 600V DC power supply is filtered by electromagnetic compatibility, it is rectified by three-phase uncontrolled rectification, and the electrical isolation with the 110V DC power supply is completed by isolation relays K1 and K2;

[0015] S12, when the 110V DC power supply is filtered by electromagnetic compatibility, the electrical isolation with the rectified voltage of the 380V AC power supply / 600V DC power supply is completed by isolation relays K3 and K4;

[0016] S13, the 380V AC power supply is rectified, the input is filtered by a pre-charge circuit, the voltage is boosted by a power factor correction circuit, and the motor is powered by an inverter circuit output;

[0017] S14, when the 110V DC power supply is input, it is filtered by a pre-charge circuit without voltage boosting, and the motor is powered by an inverter output.

[0018] Further, the step of monitoring the power supply level state of the power supply through the controller during power supply and autonomously selecting a corresponding input power supply includes the following steps:

[0019] S21, when the input voltage of the 380V AC power supply is greater than 240V, the 380V AC power supply is automatically selected for input power supply;

[0020] S22, when the 380V AC power supply input voltage is less than 240V and the 110V DC power supply input is greater than 61V, then select the 110V DC power supply input to supply power;

[0021] S23, when the 380V AC power supply input voltage drops below 240V, automatically stop and disconnect the 380V AC power supply input switch, and reset the 110V DC power supply input power supply mode to start;

[0022] S24, when the 380V AC power supply input voltage rises above 240V, then disconnect the 110V DC power supply input switch, and reset the 380V AC power supply input power supply mode to start.

[0023] Further, after the motor is started, the controller controls the motor to work in a corresponding working mode according to the pressure signal fed back by the pressure sensor and the start-stop signal.

[0024] S31, when the vehicle is lifted, the 380V AC power supply is used to supply power to the controller to pre-charge the controller;

[0025] S32, the air compressor is started for the first time to reach the standard speed time of 10 seconds, and is started and stopped according to the start-stop signal;

[0026] S33, when the 380V AC power supply is input, the controller adjusts the motor speed according to the compressor rear-end load air pressure collected by the pressure sensor;

[0027] S34, the motor is in a corresponding working mode according to different motor speeds.

[0028] Further, the working mode includes a safety mode, a standard mode, a silent mode and an auxiliary mode.

[0029] According to another aspect of the present application, there is also provided a rail transit vehicle air supply device adaptive variable frequency control system, which comprises a power supply module, a monitoring selection module and a control module, and the power supply module is connected with the control module through the monitoring selection module;

[0030] The power supply module is used to supply power to the controller using a power supply device, and to select a corresponding mode to complete motor power supply;

[0031] The monitoring selection module is used to monitor the power level state of the power supply through the controller when power is supplied, and to autonomously select a corresponding input power supply;

[0032] The control module is used to control the motor to work in a corresponding working mode according to the pressure signal fed back by the pressure sensor and the start-stop signal after the motor is started.

[0033] Further, the power supply includes a 380V alternating current power supply, a 600V direct current power supply and a 110V direct current power supply.

[0034] Further, the controller includes an input electromagnetic compatibility filter module, an input three-phase rectification module, an isolation relay module, a pre-charge module, a power factor correction and boost module, a three-phase inversion module, a voltage / current sampling module, a driving module, a communication module and a control circuit module.

[0035] The present application has the following advantages:

[0036] 1. The main air supply device based on the present application can be universally applied to the air supply device for 3 to 8 marshalling vehicles of rail transit, and can reduce the exhaust volume to realize noise reduction and energy saving, improve passenger comfort, and improve the working rate of the compressor to effectively prevent the emulsification of lubricating oil and ensure the operational reliability of the air supply device in the whole life cycle. In the vehicle preparation stage, the rapid air supply or total air leakage fault condition, the exhaust volume can be increased to improve the availability and safety of the vehicle. By using frequency conversion control technology, the compressor is matched to realize AC 380V / DC 600V / DC 110V power supply system compatibility, adjustable exhaust volume, main and auxiliary integrated function expansion, and can integrate communication, pressure detection, temperature detection and vibration detection functions.

[0037] 2. The main and auxiliary air supply device is integrated, which effectively simplifies the whole vehicle equipment arrangement, reduces the whole vehicle weight, reduces the energy consumption and wear of the vehicle, and realizes power supply system compatibility. The train can directly use 600V direct current power supply, simplifies the rectifier inversion module, improves the motor power factor, realizes energy saving, reduces the whole life cycle cost, realizes frequency conversion soft start, greatly reduces the starting current of the motor, and reduces the capacity requirement of the auxiliary inverter.

[0038] 3. The present application can provide clean and dry compressed air with self-adaptive exhaust volume adjustment to the vehicle according to the actual use scene of the vehicle combined with the total air pressure condition, and realize the adjustment of the motor speed through frequency conversion control combined with the total air pressure signal of the vehicle, so as to realize the exhaust volume adjustment of the screw compressor. At the same time, under the condition of vehicle bow rising, through frequency conversion control, the final outlet exhaust volume of the air supply device is adjusted in the range of 500-1900L / min, which can cover the air demand of 3 to 8 marshalling vehicles of rail transit. When the vehicle is not rising, under the condition of battery power supply, the compressor is driven to operate through frequency conversion boost control, and the exhaust volume is about 300L / min, which meets the use requirement of the vehicle bow rising.

[0039] 4、The present application can reduce the exhaust volume to realize energy saving and noise reduction, and improve the working rate of the compressor to effectively prevent the emulsification of lubricating oil when the air supply device is switched to the silent air supply mode in the vehicle air volume stabilization or door opening state; the air supply device is switched to the safety mode to increase the exhaust volume to ensure the air demand of the vehicle and improve the availability and safety of the vehicle when the vehicle is in the preparation or air supply insufficient fault condition; the air supply device is switched to the standard air supply mode to keep consistent with the exhaust volume of the existing mainstream product in the above conditions. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a flow chart of a rail transit vehicle air supply device self-adaptive variable frequency control method according to an embodiment of the present application;

[0042] Figure 2 is one of the principle block diagrams of a rail transit vehicle air supply device self-adaptive variable frequency control system according to an embodiment of the present application;

[0043] Figure 3 is the second principle block diagram of a rail transit vehicle air supply device self-adaptive variable frequency control system according to an embodiment of the present application;

[0044] Figure 4 is the principle block diagram of a motor control system in a rail transit vehicle air supply device self-adaptive variable frequency control method according to an embodiment of the present application;

[0045] Figure 5 is the principle block diagram of a controller system in a rail transit vehicle air supply device self-adaptive variable frequency control method according to an embodiment of the present application;

[0046] Figure 6 is the system control logic diagram of a rail transit vehicle air supply device self-adaptive variable frequency control method according to an embodiment of the present application.

[0047] In the drawings:

[0048] 1, power supply module; 2, monitoring selection module; 3, control module. DETAILED DESCRIPTION

[0049] To further explain the embodiments, the present application provides the accompanying drawings which are part of the disclosure of the present application, mainly used to illustrate the embodiments, and can be explained in combination with the related description of the specification to understand the operation principle of the embodiments. Those skilled in the art should understand other possible implementations and advantages of the present application by referring to these contents.

[0050] According to an embodiment of the present application, a rail transit vehicle air supply device adaptive variable frequency control method and system are provided.

[0051] The present application will be further described in conjunction with the accompanying drawings and specific embodiments, as shown in the drawings, Figures 1 to 4 The rail transit vehicle air supply device adaptive variable frequency control method according to the embodiment of the present application includes the following steps:

[0052] S1, using a power supply to power the controller, and selecting a corresponding way to complete the motor power supply;

[0053] The power supply includes a 380V alternating current power supply (AC), a 600V direct current power supply (DC), and a 110V direct current power supply (DC).

[0054] The controller includes an input electromagnetic compatibility filter module, an input three-phase rectifier module, an isolation relay module, a pre-charge module, a power factor correction and boost module, a three-phase inverter module, a voltage / current sampling module, a driving module, a communication module, and a control circuit module.

[0055] As shown in the drawings, Figure 5 Specifically, the use of the power supply to power the controller and the selection of the corresponding way to complete the motor power supply includes the following steps:

[0056] S11, when the alternating current power supply 380V / direct current power supply 600V is filtered by electromagnetic compatibility (EMC), it is rectified by three-phase uncontrolled rectification, and the electrical isolation with the direct current power supply 110V is completed by isolation relays K1 and K2;

[0057] S12, when the direct current power supply 110V is filtered by electromagnetic compatibility, the electrical isolation with the alternating current power supply 380V / direct current power supply 600V rectified voltage is completed by isolation relays K3 and K4;

[0058] S13, the alternating current power supply 380V rectified input is filtered by the pre-charge circuit, boosted by the power factor correction circuit, and then output by the inverter circuit to complete the motor power supply;

[0059] S14, when the direct current power supply 110V is input, it is filtered by the pre-charge circuit without boosting, and directly inverts the output to complete the motor power supply.

[0060] S2, when power supply, the power supply controller monitors the power level of the power supply, and selects the corresponding input power supply;

[0061] As shown in Figure 6 , wherein the power supply controller monitors the power level of the power supply, and autonomously selects the corresponding input power supply includes the following steps:

[0062] S21, when the AC power supply 380V power input voltage is greater than 240V, the AC power supply 380V power input is automatically selected for power supply;

[0063] S22, when the AC power supply 380V power input voltage is less than 240V, and the DC power supply 110V power input is greater than 61V, the DC power supply 110V power input is selected for power supply;

[0064] S23, when the AC power supply 380V power input voltage drops below 240V, the AC power supply 380V input switch is automatically turned off and the DC power supply 110V power input is set to power supply mode and started again;

[0065] S24, when the AC power supply 380V input voltage rises above 240V, the DC power supply 110V input switch is turned off and the AC power supply 380V power supply mode is set to power supply mode and started again.

[0066] S3, after the motor starts, the controller controls the motor to work in the corresponding working mode according to the pressure signal and start-stop signal fed back by the pressure sensor;

[0067] Wherein, after the motor starts, the controller controls the motor to work in the corresponding working mode according to the pressure signal and start-stop signal fed back by the pressure sensor, which includes the following steps:

[0068] S31, when the vehicle is lifted, the controller is pre-charged by the AC power supply 380V;

[0069] S32, the air compressor is started for the first time to reach the standard speed time of 10 seconds, and is started and stopped according to the start-stop signal;

[0070] S33, when the input AC power supply 380V is powered, the controller adjusts the motor speed according to the compressor rear-end load air pressure collected by the pressure sensor;

[0071] S34, according to different motor speeds, it is in the corresponding working mode.

[0072] In addition, in the case of external manual removal of the signal, the pressure sensor control mode is removed, and the motor working mode is maintained in the standard mode, that is, the motor working mode can be manually set to the standard mode, and the air supply efficiency of the vehicle in the maintenance and debugging working condition is ensured.

[0073] Specifically, the operating modes include safety mode, standard mode, silent mode, and auxiliary mode.

[0074] Among them, the safety mode increases the motor speed by increasing the frequency of operation, which temporarily increases the exhaust volume of the air supply device, effectively reducing vehicle preparation time and increasing redundancy under fault conditions.

[0075] The standard mode is the standard speed, which is the standard exhaust volume of the current mainstream air supply device products;

[0076] In silent mode, when the vehicle is stopped at a station, the motor speed is reduced by operating at a lower frequency. This reduces the noise of the compressor while ensuring a certain amount of compressed air output, thus improving passenger comfort.

[0077] The auxiliary mode can be simultaneously powered by the train's battery (DC110V) and by the auxiliary inverter when the pantograph receives power (with a reserved DC power supply interface); it integrates the main and auxiliary air supply devices, eliminating the need for a separate auxiliary air supply device on the train.

[0078] like Figure 2 As shown, according to another embodiment of the present invention, an adaptive frequency conversion control system for a rail transit vehicle air supply device is also provided. The adaptive frequency conversion control system for a rail transit vehicle air supply device includes a power supply module 1, a monitoring and selection module 2, and a control module 3, wherein the power supply module 1 is connected to the control module 3 through the monitoring and selection module 2.

[0079] The power supply module 1 is used to supply power to the controller using a power supply device and to select an appropriate method to supply power to the motor;

[0080] The monitoring and selection module 2 is used to monitor the power level status of the power source through the controller when power is supplied, and to autonomously select the corresponding input power source.

[0081] The control module 3 is used to control the motor to operate in the corresponding working mode after the motor starts, based on the pressure signal and start / stop signal fed back by the pressure sensor.

[0082] The power supply includes a 380V AC power supply, a 600V DC power supply and a 110V DC power supply;

[0083] The controller includes an input electromagnetic compatibility filtering module, an input three-phase rectifier module, an isolation relay module, a pre-charge module, a power factor correction boost module, a three-phase inverter module, a voltage / current sampling module, a drive module, a communication module, and a control circuit module.

[0084] The application realizes flexible adjustment of exhaust capacity and function expansion of main and auxiliary integration of the air supply device by fusing variable frequency control technology, permanent magnet synchronous motor technology and PHM technology, controls motor speed through the controller integrated with the motor, matches the application scene of the air supply device, and can realize the function expansion of meeting the above functions, specifically including:

[0085] Gear one: rated 9.5kW mode (adapted to 3-6 marshalling vehicles)

[0086] Safety mode: 0kPa-730kPa (pressure sensor analog signal: 4mA-11.3mA) motor speed 1800rpm (rpm: revolutions per minute);

[0087] Standard mode: 730kPa-780kPa (pressure sensor analog signal: 11.3mA-11.8mA) motor speed 1500rpm;

[0088] Silent mode: 780kPa-950kPa (pressure sensor analog signal: 11.8mA-13.5mA) motor speed 900rpm;

[0089] Gear two: rated 16kW mode (adapted to 6-8 marshalling vehicles)

[0090] Safety mode: 0kPa-730kPa (pressure sensor analog signal: 4mA-11.3mA) motor speed 3200pm;

[0091] Standard mode: 730kPa-780kPa (pressure sensor analog signal: 11.3mA-11.8mA) motor speed 2700rpm;

[0092] Silent mode: 780kPa-950kPa (pressure sensor analog signal: 11.8mA-13.5mA) motor speed 1620rpm;

[0093] Note: Gear one and gear two are set before the air supply device product is factory-finished according to different marshalling forms of vehicles.

[0094] Specifically, the exhaust capacity is flexibly adjustable, and specifically divided into four working modes:

[0095] Safety mode: improve the motor speed by frequency rise operation, and improve the exhaust capacity of the air supply device by about 20%;

[0096] Corresponding working condition: initial charging, large or abnormal wind consumption, and total wind pressure <730kPa (pressure sensor analog signal: 4mA-11.3mA, initial charging, large or abnormal wind consumption);

[0097] Standard mode: standard power frequency, providing rated exhaust volume;

[0098] Corresponding working condition: standard air supply mode except for safety mode and silent mode, 780 kPa > total air pressure > 730 kPa (pressure sensor analog signal: 11.3 mA ~ 11.8 mA, standard air supply mode except for safety mode and silent mode);

[0099] Silent mode: reduce the speed of the motor by reducing the frequency, reduce the noise of the compressor during operation, and improve the comfort of passengers under the condition of ensuring a certain amount of compressed air output;

[0100] Corresponding working condition: normal operation condition of the vehicle, including operation process, station stop and other conditions. This condition is the commonly used condition, which can effectively control the operation rate of the compressor, avoid oil emulsification problem, and the total air pressure is in the normal range, i.e. 780 kPa ~ 950 kPa (pressure sensor analog signal: 11.8 mA ~ 13.5 mA, normal operation condition of the vehicle, including operation process, station stop and other conditions).

[0101] Auxiliary mode: using train battery power supply to ensure a certain amount of compressed air output for vehicle bow raising. It can reduce the capacity of auxiliary inverter, realize the integration of main and auxiliary air supply devices, and simplify the configuration of train system without the need for separate auxiliary air supply device;

[0102] Realize variable frequency soft start, greatly reduce the starting current; combined with permanent magnet synchronous motor technology, improve the power factor and efficiency of the motor, realize energy saving and light weight; compatible power supply system: can simultaneously compatible with 380V AC power supply, 600V DC power supply, train battery 110V DC power supply; facing the actual operation condition of the vehicle, through the technology of parameter acquisition monitoring, data communication and intelligent algorithm for fault diagnosis and early warning, meet the safety, reliability and availability requirements.

[0103] The system has the following protection functions: input overvoltage protection, input undervoltage protection, overtemperature protection, motor stall protection, controller overload protection, output open-phase protection, input reverse connection protection, communication failure protection, etc.

[0104] To sum up, by means of the technical scheme of the present application, the main air supply device can be generally applied to the air supply device for 3 to 8 marshalling vehicles of rail transit, and the air exhaust volume can be reduced to realize noise reduction and energy saving and improve passenger comfort in normal operation conditions of the vehicle; meanwhile, the working rate of the compressor can be improved to effectively prevent the emulsification of lubricating oil and ensure the operation reliability of the air supply device in the whole life cycle; by adopting the frequency conversion control technology, the AC380V / DC600V / DC110V power supply system is compatible, the air exhaust volume is adjustable, the main and auxiliary functions are integrated, and the communication, pressure detection, temperature detection and vibration detection functions can be integrated. The main and auxiliary air supply devices are integrated, the vehicle equipment arrangement is effectively simplified, the vehicle weight is reduced, the vehicle energy consumption and wear and tear are reduced, the power supply system is compatible, the train can be directly powered by 600V DC power supply, the rectifier and inverter modules are simplified, the motor power factor is improved, energy saving is realized, the whole life cycle cost is reduced, the frequency conversion soft start is realized, the starting current of the motor is greatly reduced, and the capacity requirement of the auxiliary inverter is reduced.

[0105] The present application can provide clean and dry compressed air with self-adaptive exhaust volume adjustment to the vehicle according to the actual operation scene of the vehicle and the total air pressure, and can realize the adjustment of the motor speed through frequency conversion control in combination with the total air pressure signal of the vehicle, so as to realize the adjustment of the exhaust volume of the screw compressor; meanwhile, in the case of the vehicle with the pantograph up, the final outlet exhaust volume of the air supply device is adjusted to 500-1900 L / min through frequency conversion control, which can cover the air demand of 3 to 8 marshalling vehicles of rail transit; in the case of the vehicle without the pantograph up, the compressor is driven to operate through frequency conversion boost control under the condition of battery power supply, and the exhaust volume is about 300 L / min, which meets the use requirement of the vehicle with the pantograph up; in the case of stable air volume of the vehicle or the vehicle with the door open, the air supply device is switched to the silent air supply mode, which can reduce the exhaust volume to realize energy saving and noise reduction, and the working rate of the compressor can be improved to effectively prevent the emulsification of lubricating oil; in the case of vehicle preparation or air supply shortage and other fault conditions, the air supply device is switched to the safety mode to increase the exhaust volume to ensure the air demand of the vehicle and improve the availability and safety of the vehicle; in the above conditions, the air supply device is switched to the standard air supply mode, which is consistent with the exhaust volume of the existing mainstream products.

[0106] The above only describes the preferred embodiments of the present application and should not be used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for adaptive variable frequency control of a rail transit vehicle air supply device, characterized in that, The method comprises the following steps: S1, using the power supply to power the controller, and selecting a corresponding mode to complete motor power supply, comprising the following steps: S11, when the 380V AC power supply / 600V DC power supply is filtered through electromagnetic compatibility, and is rectified by three-phase uncontrolled rectification, the electrical isolation with the 110V DC power supply is completed by the isolation relays K1 and K2; S12, when the 110V DC power supply is filtered through electromagnetic compatibility, the electrical isolation with the 380V AC power supply / 600V DC power supply rectified voltage is completed by the isolation relays K3 and K4; S13, the 380V AC power supply rectified input is input through a pre-charging circuit, is boosted by a power factor correction circuit, and is output by an inverter circuit to complete motor power supply; S14, when the 110V DC power supply input is input, it is directly invertered output to complete motor power supply after pre-charging without boosting; S2, when the power supply is monitored by the controller, the power level state of the power supply is selected, and the corresponding input power supply is selected, comprising the following steps: S21, when the 380V AC power supply input voltage is greater than 240V, the 380V AC power supply input is automatically selected for power supply; S22, when the 380V AC power supply input voltage is less than 240V, and the 110V DC power supply input is greater than 61V, the 110V DC power supply input is selected for power supply; S23, when the 380V AC power supply input voltage drops below 240V, the 380V AC power supply input switch is automatically turned off and the 110V DC power supply input power supply mode is reset and started; S24, when the 380V AC power supply input voltage rises above 240V, the 110V DC power supply input switch is turned off and the 380V AC power supply input power supply mode is reset and started; S3, after the motor is started, the controller controls the motor to work in the corresponding working mode according to the pressure signal and the start-stop signal fed back by the pressure sensor.

2. The adaptive variable frequency control method for a rail transit vehicle air supply device according to claim 1, characterized in that, The power supply comprises a 380V AC power supply, a 600V DC power supply and a 110V DC power supply.

3. The adaptive variable frequency control method for a rail transit vehicle air supply device according to claim 2, characterized in that, The controller comprises an input electromagnetic compatibility filter module, an input three-phase rectifier module, an isolation relay module, a pre-charging module, a power factor correction and boosting module, a three-phase inverter module, a voltage / current sampling module, a driving module, a communication module and a control circuit module.

4. The adaptive variable frequency control method for a rail transit vehicle air supply device according to claim 1, characterized in that, After the motor is started, the controller controls the motor to work in the corresponding working mode according to the pressure signal and the start-stop signal fed back by the pressure sensor, comprising the following steps: S31, when the vehicle is lifted, the 380V AC power supply is used to power the controller to pre-charge the controller; S32, the air compressor is started for the first time to reach the standard speed time of 10 seconds, and is started and stopped according to the start-stop signal; S33, when the 380V AC power supply is input, the controller adjusts the motor speed according to the compressor rear-end load air pressure collected by the pressure sensor; S34, the motor is in the corresponding working mode according to different motor speeds.

5. The adaptive variable frequency control method of a rail transit vehicle air supply device according to claim 4, characterized in that, The working mode comprises a safety mode, a standard mode, a silent mode and an auxiliary mode.

6. An adaptive variable frequency control system for a rail transit vehicle air supply device, for implementing the adaptive variable frequency control method for the rail transit vehicle air supply device according to any one of claims 1-5, characterized in that, The rail transit vehicle air supply device adaptive variable frequency control system comprises a power supply module, a monitoring selection module and a control module, and the power supply module is connected with the control module through the monitoring selection module; The power supply module is used for powering the controller by using a power supply device and selecting a corresponding mode to complete motor power supply; The monitoring selection module is used for monitoring the power level state of the power supply by the controller during power supply, and autonomously selecting a corresponding input power supply; The control module is used for controlling the motor to work in a corresponding working mode according to the pressure signal and the start-stop signal fed back by the pressure sensor after the motor is started.

7. The adaptive variable frequency control system of a rail transit vehicle air supply device according to claim 6, characterized in that, The power supply comprises a 380V alternating current power supply, a 600V direct current power supply and a 110V direct current power supply.

8. The adaptive variable frequency control system of a rail transit vehicle air supply device according to claim 7, characterized in that, The controller comprises an input electromagnetic compatibility filter module, an input three-phase rectifier module, an isolation relay module, a pre-charge module, a power factor correction and voltage boosting module, a three-phase inverter module, a voltage / current sampling module, a driving module, a communication module and a control circuit module.

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