A rail milling vehicle backup power supply system and seamless switching method thereof

Abstract

A backup power supply system for a rail milling and grinding vehicle comprises a connected power vehicle II, a power vehicle I and a working vehicle, a main internal combustion generator set P1 is provided on the power vehicle I, an auxiliary internal combustion generator set P2 is provided on the power vehicle II, the power output end of the main internal combustion generator set P1 is connected to the main input power supply interface of the power conversion switch, the power output end of the auxiliary internal combustion generator set P2 is connected to the main power input interface of the power conversion switch, the power conversion switch is connected to all the power loads of the vehicle, and the main and auxiliary internal combustion generator sets are switched and selected through the power conversion switch; the backup power supply system is connected to the basic power loads of the vehicle to ensure uninterrupted power supply to the basic power loads of the vehicle during the switching of the main and auxiliary internal combustion generator sets. The backup power supply system of the present invention serves as an emergency energy source during the switching of the power source, ensures the normal and uninterrupted operation of the basic equipment, effectively avoids the loss of processing data, insufficient light in the emergency processing environment and other factors, and improves the operation safety of the rail milling and grinding vehicle.

Description

Technical Field

[0001] The invention belongs to the technical field of railway engineering and maintenance vehicles, and in particular relates to a backup power supply system for a rail milling vehicle and a seamless switching method thereof. Background Art

[0002] At present, the use of rail grinding / rail milling technology for railway line maintenance has become a consensus in track maintenance at home and abroad. The application of internal combustion generator sets in the field of rail grinding is mature and stable. It not only has high thermal efficiency, low fuel consumption, low cost, fast start-up, simple operation, but also has a wide power range, which is conducive to selection and design. In recent years, with the doubling of the frequency of vehicle operation in the railway industry, great requirements have been placed on the safety and stability of railway vehicles. Therefore, in the process of vehicle development, FEMA failure mode compatible design has become a hard indicator in the industry. It is necessary to have a main internal combustion generator set to provide power source for the whole vehicle load, and an auxiliary internal combustion generator set as a backup power source for the main internal combustion generator set. However, the overall size of the internal combustion generator set is relatively large, and the main and auxiliary internal combustion generator sets cannot be configured on the same car at the same time. When the main internal combustion generator set fails, the backup auxiliary internal combustion generator set needs to be connected to the power grid, but the switching process requires a certain interval time, which may cause the power supply interruption of key power equipment to cause the loss of processing data, the driving system stops working, etc. Therefore, it is urgent to design a technical solution to enable the backup power system on the rail vehicle to maintain the normal power demand of key equipment during the switching process of the main and auxiliary internal combustion generator sets. If lead-acid batteries are used as emergency power sources for switching between the main and auxiliary internal combustion generator sets, this solution is economical and simple, but the battery usage status cannot be reported to the whole vehicle, and charging can only be done through human intervention with a high frequency of intervention. When the internal combustion generator set fails, the uninterrupted power supply of the control system cannot be guaranteed. Summary of the invention

[0003] The purpose of the present invention is to provide a backup power supply system for a rail milling vehicle and a seamless switching method thereof, and to select the backup power supply system as an emergency energy source during power source switching to ensure normal and uninterrupted operation of basic equipment of the vehicle.

[0004] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. A backup power supply system for a rail milling vehicle proposed in the present invention includes a power car II, a power car I and a working car connected in sequence from back to front in the working direction of the rail milling vehicle, a main internal combustion generator set P1 is provided on the power car I, and an auxiliary internal combustion generator set P2 is provided on the power car II, the power output end of the main internal combustion generator set P1 is connected to the main input power supply interface of the power conversion switch, the power output end of the auxiliary internal combustion generator set P2 is connected to the main power input interface of the power conversion switch, the output end of the power conversion switch is connected to all the power loads of the vehicle, the main and auxiliary internal combustion generator sets are switched through the power conversion switch so that the main internal combustion generator set or the auxiliary internal combustion generator set supplies power to all the power loads of the vehicle; the power output end of the backup power supply system is connected to the basic power loads of the vehicle to ensure uninterrupted power supply to the basic power loads of the vehicle during the switching of the main and auxiliary internal combustion generator sets.

[0005] The purpose of the present invention is further achieved by adopting the following technical measures.

[0006] The aforementioned rail milling vehicle backup power supply system, wherein the backup power supply system includes an uninterruptible power supply module J4, the uninterruptible power supply module J4 includes a battery module and a battery management system BMS connected to the battery module, the power output end of the power conversion switch is connected to the battery module through a rectifier module to realize the charging function of the battery module, the output end of the battery module is connected to the external output switch through an inverter module, the external output switch is respectively connected to the vehicle lighting system J2 and the power module M1, a contactor KM1 is provided on the power supply line between the vehicle lighting system J2 and the external output switch, and the battery management system BMS is connected to the control of the external output switch. The output end of the power module M1 is connected to the input end of the redundant module M2, the other input end of the redundant module M2 is connected to the output end of the power module M3, the output end of the power module M3 is connected to the power output end of the power conversion switch, the output end of the redundant module M2 is connected to the control system J1, the control system J1 includes an NCU control unit, the NCU control unit is communicatively connected to the battery management system BMS, and the on-off of the contactor KM1 is controlled by the NCU control unit; the output end of the vehicle lighting system J2 is also connected to the power output end of the power conversion switch through the contactor KM2, and the on-off of the contactor KM2 is controlled by the NCU control unit.

[0007] The aforementioned rail milling vehicle backup power supply system, wherein the battery module can also be charged with AC power via an AC / DC module and a AC power plug.

[0008] In the aforementioned rail milling vehicle backup power supply system, the KM1 coil of the contactor KM1 is connected in series with the NCU control switch, and the control end of the NCU control switch is communicatively connected with the NCU control unit.

[0009] In the aforementioned rail milling vehicle backup power supply system, the output end of the redundancy module M2 is also connected to the vehicle driving system.

[0010] In the aforementioned backup power supply system for rail milling and grinding vehicles, the power conversion switch is a handle interlocking rotary switch or a power supply selection module.

[0011] The aforementioned rail milling vehicle backup power supply system, wherein the control system J1 also includes a vehicle-mounted computer connected to the NCU control unit, and the vehicle-mounted computer is connected to the display screen and the control panel respectively to facilitate the display of the vehicle status and the operator to operate the vehicle.

[0012] The present invention also proposes a seamless switching method for a backup power supply system of a rail milling vehicle. When a main internal combustion generator set fails and an auxiliary internal combustion generator set needs to be switched, the control system J1 identifies the fault information and performs the following steps:

[0013] Step 1: The NCU control unit in the control system J1 sends a signal to wake up the backup power system and sends an instruction to the battery management system BMS to allow external power supply output;

[0014] Step 2: After receiving the command from the control system J1, the battery management system BMS closes the external voltage output switch, and the output voltage of the uninterruptible power supply module J4 is rectified into direct current by the power supply module M1 and then output to the redundancy module M2. At the same time, the uninterruptible power supply module J4 feeds back the closing signal of the external output switch to the NCU control unit of the control system J1;

[0015] Step 3: The redundancy module M2 is compatible with at least two power supply input voltages of the power module M1 and the power module M3 to ensure the normal power supply of the control system J1 and the driving system J3;

[0016] Step 4: The NCU control unit in the control system J1 disconnects the coil power supply circuit of the contactor KM2, causing the KM2 coil to lose power, and the normally open contact of KM2 disconnects the power supply of the vehicle lighting system J2;

[0017] Step 5: After the NCU control unit in the control system J1 recognizes that the contactor KM2 is disconnected, the NCU control switch is closed to energize the KM1 coil of the contactor KM1, and the normally open contact of KM1 is closed to ensure the normal operation of the vehicle lighting system J2;

[0018] Step 6: The NCU control unit notifies the main internal combustion generator set P1 to power off;

[0019] Step 7: The main internal combustion generator set P1 is powered off, the power conversion switch is turned to OFF, the power module M3 is powered off, and the control system J1 and the vehicle lighting system J2 are completely powered by the backup power system;

[0020] Step 8, connect the output interface of the auxiliary internal combustion generator set on the power car II to the mains input interface of the power conversion switch on the power car I;

[0021] Step nine, rotate the power conversion switch to the mains ON, start the auxiliary internal combustion generator set P2, the auxiliary internal combustion generator set P2 outputs an AC voltage to the outside, the AC voltage is sent to the power module M3 through the power output end of the power conversion switch, the voltage module M3 is powered on and outputs voltage to the redundant module M2;

[0022] Step 10, the NCU control unit in the control system J1 controls the NCU control switch to be turned off, then the KM1 coil loses power, the KM1 normally open contact is disconnected, and the vehicle lighting system J2 is powered off;

[0023] Step 11, after the NCU control unit in the control system J1 detects that the contactor KM1 is disconnected, the KM2 coil of the contactor KM2 is powered on, and the normally open contact of KM2 is closed, restoring the normal power supply of the vehicle lighting system J2;

[0024] Step 12: After the NCU control unit in the control system J1 detects that the contactor KM2 is powered on, it notifies the battery management system BMS, and the battery management system BMS controls the external output switch to be disconnected to complete the automatic power-off of the backup power system.

[0025] Furthermore, the NCU control unit in the control system J1 is connected to the processor MCU in the main internal combustion generator set in communication to achieve information exchange.

[0026] Furthermore, in step twelve, after the backup power system is automatically powered off, the battery management system BMS can control the battery module to charge from the main power grid through SOC power identification.

[0027] Through the above technical scheme, the present invention selects the backup power supply system as the emergency energy source during the switching of the main and auxiliary internal combustion generator sets, ensures the normal operation of the basic equipment of the vehicle, realizes the automatic seamless switching of power supply technology, effectively avoids the loss of processing data, driving difficulties, insufficient light in the emergency processing environment and other factors, and improves the operation safety of the rail milling vehicle; at the same time, the backup power supply system can communicate and interact with the control system on the rail milling vehicle, so that the charging and discharging process of the backup power supply system can be automatically managed, saving labor costs; it is also convenient for the driver to understand the use and status of the backup power supply system on the display screen of the control system, which is beneficial to the maintenance personnel for inspection and maintenance.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a schematic structural diagram of a backup power supply system for a rail milling vehicle.

[0030] Figure 2 The invention discloses an electrical principle diagram of a backup power supply system for a rail milling vehicle.

[0031] Figure 3 The present invention is a block diagram of the module composition and connection of an uninterruptible power supply module J4 in a backup power supply system for a rail milling and grinding vehicle.

[0032] Figure 4 The invention discloses a power-on flow chart of a seamless switching method for a backup power supply system of a rail milling vehicle.

[0033] Figure 5 The invention discloses a power-off flow chart of a seamless switching method for a backup power supply system of a rail milling and grinding vehicle. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0035] See also Figures 1 to 3 The present embodiment provides a backup power supply system for a rail milling vehicle, including a power vehicle II, a power vehicle I and a working vehicle connected in sequence from the back to the front in the working direction of the rail milling vehicle, the working vehicle performs milling operations in the front, the power vehicle I performs polishing and grinding in the back and provides the power source of the whole vehicle to drive the working vehicle to operate, and the power vehicle II is arranged behind the power vehicle I as a backup power source. A main internal combustion generator set P1 is arranged on the power vehicle I, and an auxiliary internal combustion generator set P2 is arranged on the power vehicle II, the power output end of the main internal combustion generator set P1 is connected to the main input power supply interface of the power conversion switch, the power output end of the auxiliary internal combustion generator set P2 is connected to the main power input interface of the power conversion switch, the output end of the power conversion switch is connected to all the power loads of the whole vehicle, the main and auxiliary internal combustion generator sets are switched through the power conversion switch so that the main internal combustion generator set or the auxiliary internal combustion generator set supplies power to all the power loads of the whole vehicle; the power output end of the backup power supply system is connected to the basic power loads of the whole vehicle, so as to ensure the uninterrupted power supply of the basic power loads of the whole vehicle during the switching of the main and auxiliary internal combustion generator sets.

[0036] In this embodiment, the working vehicle includes a conventional numerical control system, a milling and grinding unit, a traction running system, an iron chip collection system, a pneumatic system and other auxiliary systems of the working vehicle, etc. The power vehicle electrical load includes a conventional grinding unit, a numerical control system and other auxiliary systems of the power vehicle; other auxiliary systems of the working vehicle and other auxiliary systems of the power vehicle generally include existing lighting equipment, air conditioners, air compressors, alarms, display screens and control consoles, etc. The rail milling and grinding vehicle uses a main internal combustion generator set as the total power source of the vehicle, an auxiliary internal combustion generator set as the backup power source of the vehicle, and a backup power supply system as an emergency energy source during the switching of the main and auxiliary internal combustion generator sets of the vehicle. Both the main internal combustion generator set and the auxiliary internal combustion generator set can ensure the normal operation of all electrical loads of the vehicle (including the electrical load of the power vehicle and the electrical load of the working vehicle), or the auxiliary internal combustion generator set can meet the normal operation of the key electrical loads of the vehicle, wherein the key electrical loads of the vehicle include but are not limited to conventional milling and grinding units, driving systems, vehicle lighting systems, numerical control systems, pneumatic systems, motor brake systems, etc. The backup power supply system ensures the normal operation of the vehicle's basic power loads. During the switching of the main and auxiliary internal combustion generator sets, the backup power supply system ensures uninterrupted power supply to the basic power loads of the entire vehicle. It is compatible with automatic charging and discharging and AC charging modes, and has the function of communicating with the entire vehicle (reporting the backup power supply system battery voltage, current, temperature, balancing strategy, SOC, alarm information, etc. to the entire vehicle), and is independent of the power supply grid of the internal combustion generator set. The basic power loads include but are not limited to the vehicle's lighting system, control system, pneumatic system, key motor braking system, driving system, etc.

[0037] Specifically, the backup power supply system includes an uninterruptible power supply module J4, which includes a battery module and a battery management system BMS connected to the battery module. The battery management system BMS has functions such as cell status monitoring, temperature control, voltage balancing, charge and discharge management, and charge and discharge protection of the battery module. The power output end of the power conversion switch is connected to the battery module through a rectifier module to realize the charging function of the battery module, and the AC power of the internal combustion engine group is converted into DC power and converted into an input voltage value compatible with the battery module model through a transformer module, and then connected to the battery module charging end to complete the charging function of the power supply grid where each internal combustion generator group is located. In order to realize controllable charging, an overcharge protection switch is set at the charging end of the battery module. When the battery management system BMS detects that the battery module is full, it controls the overcharge protection switch to be disconnected. The output end of the battery module is connected to the external output switch through the inverter module. The output voltage of the battery module is direct current, which can be converted into alternating current output through the inverter module; the external output switch is respectively connected to the vehicle lighting system J2 and the power module M1 to power them. A contactor KM1 is provided on the power supply line between the vehicle lighting system J2 and the external output switch. The battery management system BMS is connected to the control end of the external output switch and controls its on and off. The output end of the power module M1 is connected to the input end of the redundant module M2, and the other input end of the redundant module M2 is connected to the output end of the power module M3. The output end of the power module M3 is connected to the power output end of the power conversion switch. The output end of the redundant module M2 is connected to the control system J1. The control system J1 includes an NCU control unit. The NCU control unit is communicatively connected to the battery management system BMS, and the on and off of the contactor KM1 is controlled by the NCU control unit; the output end of the vehicle lighting system J2 is also connected to the power output end of the power conversion switch through the contactor KM2, and the on and off of the contactor KM2 is controlled by the NCU control unit. The redundant module M2 is an existing technology, compatible with the 24V DC power input of at least two power modules, and has at least two 24V DC outputs. When the power module M1 that supplies power to the control system J1 loses power, it can control the power module M3 to supply power to the redundant module M2 to ensure the normal operation of the control system J1; secondly, the redundant module input power side has an internal integrated current reverse flow diode, which is compatible with multiple different power modules. The power module M1 is an AC220 / DC24V power module, and the power module M3 is an AC380V / DC24V power module.

[0038] In this embodiment, in order to be compatible with the mains charging mode, the battery module is also connected to the AC / DC module and the mains plug 1 in sequence, so as to adapt to the 220V AC mains power supply.

[0039] Furthermore, the KM1 coil 201 of the contactor KM1 is connected in series with the NCU control switch 202, and the control end of the NCU control switch is connected in communication with the NCU control unit. When the NCU control switch 202 is closed, the KM1 coil 201 is energized and the KM1 normally open contact 203 is closed, thereby realizing the automatic control of the contactor KM1 by the NCU control unit. In addition, the on-off control method of the contactor KM2 is: the NCU control unit controls the switch connected in series with the KM2 coil 301 of the contactor KM2 through the I / O module M4, and disconnects the coil power supply circuit of the contactor KM2 to make the contactor KM2 lose power, and its KM2 normally open contact 302 is disconnected to complete the power off of the vehicle lighting system J2.

[0040] Furthermore, the output end of the redundant module M2 is also connected to the driving system J3. However, in actual vehicle configuration, the number of redundant module output interfaces can be configured according to the number of normal power-consuming devices required in an emergency environment on a specific vehicle model, so as to realize uninterrupted power supply for more power-consuming devices.

[0041] Preferably, the power conversion switch is a handle interlocking rotary switch or a power supply selection module. In this embodiment, an existing handle interlocking rotary switch is used, through which the main and auxiliary internal combustion generator sets are switched and selected, and electrically interlocked.

[0042] Furthermore, the control system J1 is arranged on the work vehicle, and the control system J1 also includes an existing on-board computer connected to the NCU control unit. The on-board computer is connected to the display screen and the control panel respectively to display various status parameters of the whole vehicle, and to facilitate the operator to control the operation of the whole vehicle through the control panel on the work vehicle.

[0043] The communication lines involved in the communication interaction in this embodiment include but are not limited to conventional CAN, RS485, RS232, PROFINET, PROFIBUS and other communication lines; the battery module includes but is not limited to lithium iron phosphate batteries, ternary batteries, lithium manganese oxide batteries, lithium cobalt oxide batteries and lead-acid batteries.

[0044] Combination Figure 4 and Figure 5 This embodiment further proposes a seamless switching method for the backup power supply system of a rail milling vehicle. When the main internal combustion generator set fails and needs to switch to the auxiliary internal combustion generator set, the control system J1 recognizes the fault information and performs the following steps:

[0045] Step 1: The NCU control unit in the control system J1 sends a signal to wake up the backup power system and sends an instruction to the battery management system BMS to allow external power supply output;

[0046] Step 2: After receiving the command from the control system J1, the battery management system BMS closes the external voltage output switch, and the output voltage of the uninterruptible power supply module J4 is rectified into direct current by the power supply module M1 and then output to the redundancy module M2. At the same time, the uninterruptible power supply module J4 feeds back the closing signal of the external output switch to the NCU control unit of the control system J1;

[0047] Step 3: The redundancy module M2 is compatible with at least two power supply input voltages of the power module M1 and the power module M3 to ensure the normal power supply of the control system J1 and the driving system J3;

[0048] Step 4: The NCU control unit in the control system J1 disconnects the KM2 coil power supply circuit of the contactor KM2 through the I / O module M4, so that the KM2 coil loses power, and the KM2 normally open contact disconnects the power supply of the vehicle lighting system J2;

[0049] Step 5: After the NCU control unit in the control system J1 recognizes that the contactor KM2 is disconnected, the NCU control switch 202 is closed to energize the KM1 coil of the contactor KM1, and the normally open contact of KM1 is closed to ensure the normal operation of the vehicle lighting system J2;

[0050] Step 6: The NCU control unit notifies the main internal combustion generator set P1 to power off;

[0051] Step 7: The main internal combustion generator P1 group is powered off, the power conversion switch is turned to OFF, the power module M3 is powered off, and the control system J1 and the vehicle lighting system J2 are completely powered by the backup power system; thus, the power-on process of the backup power system during seamless switching is completed.

[0052] Step 8, connect the output interface of the auxiliary internal combustion generator set P2 on the power car II to the mains input interface of the power conversion switch on the power car I;

[0053] Step nine, rotate the power conversion switch to the mains ON, connect the mains input interface to the power grid, start the auxiliary internal combustion generator set P2, and the auxiliary internal combustion generator set outputs AC voltage to the outside. The AC voltage is sent to the power module M3 through the power output end of the power conversion switch, and the voltage module M3 is powered on and outputs voltage to the redundant module M2;

[0054] Step 10, the NCU control unit in the control system J1 controls the NCU control switch to be turned off, the KM1 coil of the contactor KM1 loses power, the normally open contact of KM1 is disconnected, and the vehicle lighting system J2 is powered off;

[0055] Step 11, after the NCU control unit in the control system J1 detects that the contactor KM1 loses power, it powers on the KM2 coil of the contactor KM2, and the normally open contact of KM2 closes, restoring the normal power supply of the vehicle lighting system J2;

[0056] Step 12: After the NCU control unit in the control system J1 detects that the contactor KM2 is powered on, it notifies the battery management system BMS. The battery management system BMS controls the external output switch to disconnect, thereby completing the automatic power-off of the backup power system. All electrical loads of the vehicle are powered by the auxiliary internal combustion generator set P2, thus completing the entire seamless switching process.

[0057] Furthermore, the NCU control unit in the control system J1 is communicated with the processor MCU in the existing main internal combustion generator set to realize information interaction. For example, the processor MCU generally detects the voltage, current, temperature and other parameters of the three-phase power grid at the output end of the internal combustion generator set in real time through sensor components. When an abnormality occurs, the processor MCU can promptly transmit the information to the NCU control unit, thereby starting the seamless switching process of the backup power supply system of the present invention.

[0058] Furthermore, in step twelve, when the backup power system is automatically powered off, the battery management system BMS obtains the battery module power information through SOC power identification, and when charging is needed, it can control the battery module to draw power from the main power supply grid at the power output end of the power switching switch.

[0059] Preferably, the main and auxiliary internal combustion generator sets may be gasoline generator sets, diesel generator sets or natural gas generator sets, but the present invention is not limited thereto.

[0060] In this embodiment, contactor KM1 and contactor KM2 are AC contactors, but the present invention is not limited to controllable switch components. In other embodiments, relays, circuit breakers, IGBTs and / or thyristors may also be used.

[0061] In other embodiments, users can also freely organize the number and connection mode of working vehicles and power vehicles as needed. For example, in order to save energy, the power vehicle II equipped with the auxiliary internal combustion generator set is not mounted behind the power vehicle I during normal operation, but when the main internal combustion generator set fails, the power vehicle II is called nearby, or multiple power vehicles are matched to achieve longer mileage rail maintenance. In addition, the present invention is not limited to the field of rail milling vehicles, but can also be applied to other types of rail engineering vehicles.

[0062] At present, most commonly used rail milling vehicles adopt overhead pantograph to draw power or internal combustion generator set to generate electricity as the main power supply for the whole vehicle. The seamless switching solution of the backup power supply system designed by the present invention can well solve the troubles caused by system power failure during the power supply replacement process, avoid the waste of time and human resources, and meet the needs of efficient operation of railway vehicles in the new era.

[0063] The above is only a preferred embodiment of the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention, still falls within the scope of the technical solution of the present invention.

Claims

1. A seamless switching method for a backup power supply system of a rail milling vehicle, characterized in that: When the main internal combustion generator set fails and needs to switch to the auxiliary internal combustion generator set, the control system J1 recognizes the fault information and performs the following steps: Step 1: The NCU control unit in the control system J1 sends a signal to wake up the backup power system and sends an instruction to the battery management system BMS to allow external power supply output; Step 2: After receiving the command from the control system J1, the battery management system BMS closes the external voltage output switch, and the output voltage of the uninterruptible power supply module J4 is rectified into direct current by the power supply module M1 and then output to the redundancy module M2. At the same time, the uninterruptible power supply module J4 feeds back the closing signal of the external output switch to the NCU control unit of the control system J1; Step 3: The redundancy module M2 is compatible with at least two power supply input voltages of the power module M1 and the power module M3 to ensure the normal power supply of the control system J1 and the driving system J3; Step 4: The NCU control unit in the control system J1 disconnects the coil power supply circuit of the contactor KM2, causing the KM2 coil to lose power, and the normally open contact of KM2 disconnects the power supply of the vehicle lighting system J2; Step 5: After the NCU control unit in the control system J1 recognizes that the contactor KM2 is disconnected, the NCU control switch is closed to energize the KM1 coil of the contactor KM1, and the normally open contact of KM1 is closed to ensure the normal operation of the vehicle lighting system J2; Step 6: The NCU control unit notifies the main internal combustion generator set P1 to power off; Step 7: The main internal combustion generator set P1 is powered off, the power conversion switch is turned to OFF, the power module M3 is powered off, and the control system J1 and the vehicle lighting system J2 are completely powered by the backup power system; Step 8, connect the output interface of the auxiliary internal combustion generator set on the power car II to the mains input interface of the power conversion switch on the power car I; Step nine, rotate the power conversion switch to the mains ON, start the auxiliary internal combustion generator set P2, the auxiliary internal combustion generator set P2 outputs an AC voltage to the outside, the AC voltage is sent to the power module M3 through the power output end of the power conversion switch, the power module M3 is powered on and outputs voltage to the redundant module M2; Step 10, the NCU control unit in the control system J1 controls the NCU control switch to be turned off, then the KM1 coil loses power, the KM1 normally open contact is disconnected, and the vehicle lighting system J2 is powered off; Step 11, after the NCU control unit in the control system J1 detects that the contactor KM1 is disconnected, the KM2 coil of the contactor KM2 is powered on, and the normally open contact of KM2 is closed, restoring the normal power supply of the vehicle lighting system J2; Step 12: After the NCU control unit in the control system J1 detects that the contactor KM2 is powered on, it notifies the battery management system BMS, and the battery management system BMS controls the external output switch to be disconnected, thereby completing the automatic power-off of the backup power system; The seamless switching method is implemented based on a backup power supply system for a rail milling vehicle, which includes a power car II, a power car I and a working car connected in sequence from back to front in the working direction of the rail milling vehicle, a main internal combustion generator set P1 is provided on the power car I, and an auxiliary internal combustion generator set P2 is provided on the power car II, the power output end of the main internal combustion generator set P1 is connected to the main input power supply interface of the power conversion switch, the power output end of the auxiliary internal combustion generator set P2 is connected to the main power input interface of the power conversion switch, the output end of the power conversion switch is connected to all the electrical loads of the vehicle, the main and auxiliary internal combustion generator sets are switched and selected through the power conversion switch so that the main internal combustion generator set or the auxiliary internal combustion generator set supplies power to all the electrical loads of the vehicle, and the power output end of the backup power supply system is connected to the basic electrical loads of the vehicle, thereby ensuring uninterrupted power supply to the basic electrical loads of the vehicle during the switching of the main and auxiliary internal combustion generator sets; The backup power supply system includes an uninterruptible power supply module J4, which includes a battery module and a battery management system BMS connected to the battery module. The power output end of the power conversion switch is connected to the battery module through a rectifier module to realize the charging function of the battery module. The output end of the battery module is connected to the external output switch through an inverter module. The external output switch is respectively connected to the vehicle lighting system J2 and the power module M1. A contactor KM1 is provided on the power supply line between the vehicle lighting system J2 and the external output switch. The battery management system BMS is connected to the control end of the external output switch. The output end of the power module M1 is connected to the input end of the redundant module M2. The other input end of the redundant module M2 is connected to the power module M 3 output end is connected, the output end of the power module M3 is connected to the power output end of the power conversion switch, the output end of the redundant module M2 is connected to the control system J1, the control system J1 includes an NCU control unit, the NCU control unit is communicated with the battery management system BMS, and the on-off of the contactor KM1 is controlled by the NCU control unit; the output end of the vehicle lighting system J2 is also connected to the power output end of the power conversion switch through the contactor KM2, and the on-off of the contactor KM2 is controlled by the NCU control unit; the KM1 coil of the contactor KM1 is connected in series with the NCU control switch, and the control end of the NCU control switch is communicated with the NCU control unit; the output end of the redundant module M2 is also connected to the driving system.

2. The seamless switching method of the backup power supply system of the rail milling vehicle according to claim 1 is characterized in that: The NCU control unit in the control system J1 is connected to the processor MCU in the main internal combustion generator set to achieve information exchange.

3. The seamless switching method of the backup power supply system of the rail milling vehicle according to claim 1 is characterized in that: In step twelve, after the backup power system is automatically powered off, the battery management system BMS can control the battery module to charge from the main power grid through SOC power identification.

4. The seamless switching method of the backup power supply system of a rail milling vehicle according to claim 1, characterized in that: The battery module can also be charged with AC power through an AC / DC module and a AC power plug.

5. The seamless switching method of the backup power supply system of the rail milling vehicle according to claim 1 is characterized in that: The power conversion switch is a handle interlocking rotary switch or a power supply selection module.

6. The seamless switching method of the backup power supply system of the rail milling vehicle according to claim 1 is characterized in that: The control system J1 also includes an on-board computer connected to the NCU control unit, and the on-board computer is connected to the display screen and the control panel respectively to display the status of the entire vehicle and enable operators to control the work vehicle.

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