Rail train air conditioner control system and control method

Abstract

The application discloses a kind of rail train air conditioner control system and control method, belong to vehicle-mounted electrical technical field, including inverter unit, fan and air conditioner control unit;Inverter unit is electrically connected with fan by first contactor;Inverter unit includes input filter, boost circuit, inverter circuit, output filter, delay relay, second contactor, current-limiting resistor and internal control module;Second contactor and current-limiting resistor are provided with parallel between input filter and boost circuit;The input end of delay relay is electrically connected with air conditioner control unit, and the output end of delay relay is electrically connected with the one end of current-limiting resistor close to input filter and internal control module respectively;The internal control module is electrically connected with second contactor and boost circuit respectively.Optimizes the starting control logic of vehicle-mounted inverter, realizes software and hardware time delay simultaneously, truly realizes the soft start of vehicle-mounted inverter frequency modulation and pressure regulation, prolongs the life of fan.

Description

Technical Field

[0001] This invention belongs to the field of vehicle electrical technology, and in particular relates to a rail train air conditioning control system and control method. Background Technology

[0002] Currently, when the main power supply of the subway car is normal, the traction system has its own cooling fan. However, in the event of a main power supply failure, an on-board inverter is required to convert the stored DC110V to AC380V / 50Hz to power the traction fan and ensure the normal operation of the traction system.

[0003] When the train experiences a main power supply failure, the air conditioning system activates the onboard inverter via a start signal. Simultaneously, it confirms whether the inverter has started successfully via feedback signals WOR and ERR. If the inverter starts successfully, the air conditioning system will receive a WOR signal; if the start fails, the air conditioning system will receive an ERR signal.

[0004] The existing air conditioning system starts the vehicle inverter via a start signal. After the inverter stabilizes and outputs AC380V / 50Hz, the traction fan is suddenly put into use. In this starting method, the starting current is generally 4 to 7 times the rated current. The current is very large at the moment of starting, and then gradually decreases. This surge current causes a great impact on the power grid and electrical equipment, causing the vehicle inverter to report an overcurrent fault and the traction fan to fail to start.

[0005] Therefore, there is an urgent need for a new technical solution to address this problem. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides a rail train air conditioning control system and control method to solve the problem of overcurrent fault reporting by the on-board inverter and failure of traction fan to start due to instantaneous inrush current.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a rail train air conditioning control system, comprising an inverter unit, a fan, and an air conditioning control unit; the inverter unit and the fan are electrically connected via a first contactor; the air conditioning control unit is electrically connected to both the inverter unit and the first contactor; the inverter unit includes an input filter, a boost circuit, an inverter circuit, an output filter, a time delay relay, a second contactor, a current-limiting resistor, and an internal control module; the input filter, the boost circuit, the inverter circuit, and the output filter are electrically connected sequentially.

[0008] A second contactor and a current-limiting resistor are provided between the input filter and the boost circuit; the second contactor and the current-limiting resistor are connected in parallel; the input terminal of the time-delay relay is electrically connected to the air conditioning control unit, and the output terminal of the time-delay relay is electrically connected to the end of the current-limiting resistor closest to the input filter and the internal control module, respectively; the internal control module is electrically connected to the second contactor and the boost circuit, respectively.

[0009] A method for controlling the air conditioning of a rail train, employing the rail train air conditioning control system described above, includes the following steps:

[0010] S1. The air conditioning control unit controls the first contactor to engage, and after a 10-second delay, the air conditioning control unit sends a start signal to the inverter unit.

[0011] S2. After receiving the start signal, the inverter unit delays for 10 seconds via a time delay relay to supply power to the internal control module and charge the capacitor in the boost circuit.

[0012] S3. After the capacitor in the boost circuit has finished charging, the internal control module controls the second contactor to close.

[0013] S4. After receiving power, the internal control module delays for 500 milliseconds, then starts the boost circuit to boost the voltage to DC590V via PWM wave to start the inverter circuit and begin inversion.

[0014] S5. When the inverter circuit inverts to 5Hz, it starts to output AC voltage to make the fan run.

[0015] S6, Inverter circuit: Inverter output AC380V / 50Hz, fan runs normally, sends WOR signal to air conditioning control unit;

[0016] S7. If the inverter unit fails to start, it outputs an ERR signal to the air conditioning control unit. The air conditioning control unit disconnects the start signal but does not disconnect the first contactor. After disconnecting the start signal for 10 seconds, it sends the start signal again. If the air conditioning control unit receives the ERR signal three times in a row, it directly shuts off the start signal.

[0017] S8. If the air conditioning control unit does not receive a WOR or ERR signal within 60 seconds after the inverter unit starts, the start signal is cut off. After a 10-second delay, the start signal is sent again. If no WOR or ERR signal is received after three consecutive starts, the start signal is turned off directly.

[0018] Through the above design scheme, the present invention can bring the following beneficial effects:

[0019] 1. Add a time-delay relay. The input terminal of the time-delay relay is electrically connected to the air conditioning control unit, and the output terminal of the time-delay relay is electrically connected to the end of the current-limiting resistor near the input filter and the internal control module, respectively. Optimize the vehicle inverter start-up control logic to achieve simultaneous software and hardware delay, and truly realize the soft start of the vehicle inverter with frequency and voltage regulation.

[0020] 2. The internal control module is electrically connected to the second contactor and the boost circuit respectively. After the pre-charging circuit completes charging, the internal control module controls the closing of the second contactor, so that the current limiting resistor R2 is short-circuited, thereby reducing the power consumption of the inverter.

[0021] 3. After receiving power, the internal control module delays for 500 milliseconds, then uses a PWM wave to start the boost circuit to boost the voltage to DC 590V, which then starts the inverter circuit to begin inversion. When the inverter reaches 5Hz, it begins to output AC voltage, allowing the fan to run slowly and smoothly, further reducing the impact of inrush current on the electrical equipment. Attached Figure Description

[0022] Figure 1 This is a circuit block diagram of a rail train air conditioning control system according to the present invention.

[0023] Figure 2 This is a flowchart of a rail train air conditioning control method according to the present invention.

[0024] Figure 3 This is a waveform diagram of the starting current for the traditional starting method.

[0025] Figure 4 The diagram shows the starting current waveform of the starting method of the air conditioning control system for a rail train according to the present invention.

[0026] In the diagram, 1-inverter unit, 11-input filter, 12-boost circuit, 13-inverter circuit, 14-output filter, 15-time delay relay, 16-second contactor, 17-current limiting resistor, 18-internal control module, 2-fan, 3-air conditioning control unit, 4-first contactor. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] It should be noted that the terms "front and back," "up and down," and "left and right" mentioned in the text are merely simplified descriptions of positional relationships based on the accompanying drawings, and are not intended to limit the technical solution.

[0029] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive, and users may make various changes to the following parameters without departing from the inventive mechanism and scope set forth in the claims. To avoid obscuring the essence of the invention, well-known methods and processes are not described in detail.

[0030] From the appendix Figures 1-4 As shown: A rail train air conditioning control system includes an inverter unit 1, a fan 2, and an air conditioning control unit 3; the inverter unit 1 and the fan 2 are electrically connected via a first contactor 4; the air conditioning control unit 3 is electrically connected to both the inverter unit 1 and the first contactor 4; the inverter unit 1 includes an input filter 11, a boost circuit 12, an inverter circuit 13, an output filter 14, a time delay relay 15, a second contactor 16, a current-limiting resistor 17, and an internal control module 18; the input filter 11, the boost circuit 12, the inverter circuit 13, and the output filter 14 are electrically connected in sequence.

[0031] A second contactor 16 and a current-limiting resistor 17 are provided between the input filter 11 and the boost circuit 12; the second contactor 16 and the current-limiting resistor 17 are connected in parallel; the input terminal of the time-delay relay 15 is electrically connected to the air conditioning control unit 3, and the output terminal of the time-delay relay 15 is electrically connected to the end of the current-limiting resistor 17 near the input filter 11 and the internal control module 18; the internal control module 18 is electrically connected to the second contactor 16 and the boost circuit 12.

[0032] Furthermore, the boost circuit 12 is a BOOST boost circuit.

[0033] Furthermore, the internal control module 18 starts the boost circuit 12 via a PWM wave.

[0034] A method for controlling the air conditioning of a rail train, employing the rail train air conditioning control system described above, includes the following steps:

[0035] S1. The air conditioning control unit 3 controls the first contactor 4 to engage, and after a 10-second delay, the air conditioning control unit 3 sends a start signal to the inverter unit 1.

[0036] S2. After receiving the start signal, the inverter unit 1 supplies power to the internal control module 18 and charges the capacitor in the boost circuit 12 by delaying for 10 seconds through the time delay relay 15.

[0037] S3. After the capacitor in the boost circuit 12 is fully charged, the internal control module 18 controls the second contactor 16 to close.

[0038] S4. After receiving power, the internal control module 18 delays for 500 milliseconds and starts the boost circuit 12 to boost the voltage to DC590V via PWM wave to start the inverter circuit 13 to begin inversion.

[0039] S5, When the inverter circuit 13 inverts to 5Hz, it starts to output AC voltage to make the fan 2 run;

[0040] S6, Inverter circuit 13 inverter output AC380V / 50Hz, fan 2 runs normally, and sends WOR signal to air conditioning control unit 3;

[0041] S7. If the inverter unit 1 fails to start, it outputs an ERR signal to the air conditioning control unit 3. The air conditioning control unit 3 disconnects the start signal but does not disconnect the first contactor 4. After disconnecting the start signal for 10 seconds, it sends the start signal again. If the air conditioning control unit 3 receives the ERR signal three times in a row, it directly turns off the start signal.

[0042] S8. If the air conditioning control unit 3 does not receive a WOR or ERR signal 60 seconds after the inverter unit 1 is given a start signal, the start signal is cut off. After a 10-second delay, the start signal is given again. If no WOR or ERR signal is received after three consecutive starts, the start signal is turned off directly.

[0043] A computer-readable storage medium is characterized in that it is used to store computer-readable instructions; the computer-readable instructions, when executed, include the steps described above.

[0044] In practice, the input side of inverter unit 1 is connected to the DC 110V bus through input filter 11, and the voltage is boosted to DC 590V using BOOST boost technology. The voltage is then fed into inverter circuit 13, where the inverter module converts DC to AC. After being filtered by output filter 14, the output is a sine wave AC 380V / 50Hz.

[0045] First, the air conditioning control unit 3 engages the first contactor 4, and after a 10-second delay, the air conditioning control unit 3 sends a start signal to the inverter unit 1.

[0046] Secondly, after receiving the start signal, inverter unit 1 delays for 10 seconds via time delay relay 15 to supply power to internal control module 18 and charge the capacitor in boost circuit 12. After receiving the power, internal control module 18 delays for 500 milliseconds and starts boost circuit 12 via PWM wave to boost the voltage to DC 590V, starting inverter circuit 13 to begin inversion. When inverter circuit 13 inverts to 5Hz, it begins to output AC voltage, allowing the fan to run slowly and smoothly. The addition of time delay relay 15 enables simultaneous delay in both software and hardware. After the capacitor in boost circuit 12 has finished charging, internal control module 18 controls the second contactor 16 to close, short-circuiting current-limiting resistor 17 and reducing inverter power consumption.

[0047] Finally, inverter circuit 13 outputs AC380V / 50Hz, the fan runs normally, and sends a WOR signal to air conditioning control unit 3, indicating that the vehicle inverter has started successfully.

[0048] If inverter unit 1 fails to start, it outputs an ERR signal to air conditioning control unit 3. Air conditioning control unit 3 disconnects the start signal but does not disconnect the first contactor 4. After disconnecting the start signal for 10 seconds, it sends the start signal again. If air conditioning control unit 3 receives the ERR signal three times in a row, it directly turns off the start signal.

[0049] If the air conditioning control unit 3 does not receive a WOR or ERR signal within 60 seconds after the inverter unit 1 is given a start signal, the start signal is cut off. After a 10-second delay, the start signal is given again. If no WOR or ERR signal is received after three consecutive starts, the start signal is turned off directly.

[0050] This invention optimizes the startup control logic of the vehicle-mounted inverter, achieving simultaneous software and hardware delays, and truly realizing soft-start of the vehicle-mounted inverter with frequency and voltage regulation; it makes the output frequency and voltage of the vehicle-mounted inverter conform to the characteristic curve of the wind turbine, thus extending the life of the wind turbine.

[0051] Obviously, the embodiments described above are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0052] The above mainly describes the solution of the embodiments of this application from the perspective of the method execution process. It is understood that, in order to achieve the above functions, the network device includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should readily recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments provided herein...

[0053] This application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed through hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described function for each specific application, but such implementation should not be considered beyond the scope of this application.

[0054] It should be understood that the term "unit" here can refer to application-specific integrated circuit, ASIC, electronic circuit, processor for executing one or more software or firmware programs, such as shared processor, proprietary processor or group processor, and memory, integrated logic circuit and / or other suitable components that support the described functions.

[0055] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage device (CMD). Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions to enable a computer device, such as a personal computer, server, or TRP, to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned memory includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

Claims

1. A rail train air conditioning control system, characterized in that: The system includes an inverter unit (1), a fan (2), and an air conditioning control unit (3); the inverter unit (1) and the fan (2) are electrically connected via a first contactor (4); the air conditioning control unit (3) is electrically connected to both the inverter unit (1) and the first contactor (4); the inverter unit (1) includes an input filter (11), a boost circuit (12), an inverter circuit (13), an output filter (14), a time delay relay (15), a second contactor (16), a current-limiting resistor (17), and an internal control module (18); the input filter (11), the boost circuit (12), the inverter circuit (13), and the output filter (14) are electrically connected in sequence. A second contactor (16) and a current-limiting resistor (17) are provided between the input filter (11) and the boost circuit (12); the second contactor (16) and the current-limiting resistor (17) are connected in parallel; the input terminal of the time delay relay (15) is electrically connected to the air conditioning control unit (3), and the output terminal of the time delay relay (15) is electrically connected to the end of the current-limiting resistor (17) near the input filter (11) and the internal control module (18); the internal control module (18) is electrically connected to the second contactor (16) and the boost circuit (12).

2. The rail train air conditioning control system according to claim 1, characterized in that: The boost circuit (12) is a BOOST boost circuit.

3. The rail train air conditioning control system according to claim 1, characterized in that: The internal control module (18) starts the boost circuit (12) via PWM wave.

4. A method for controlling air conditioning in a rail train, employing a rail train air conditioning control system as described in any one of claims 1 to 3, characterized in that, Includes the following steps: S1. The air conditioning control unit (3) controls the first contactor (4) to engage. After a 10-second delay, the air conditioning control unit (3) sends a start signal to the inverter unit (1). S2. After receiving the start signal, the inverter unit (1) delays for 10 seconds through the time delay relay (15) to supply power to the internal control module (18) and charge the capacitor in the boost circuit (12). S3. After the capacitor in the boost circuit (12) is fully charged, the internal control module (18) controls the second contactor (16) to close. S4. After receiving power, the internal control module (18) delays for 500 milliseconds and starts the boost circuit (12) to boost the voltage to DC590V via PWM wave to start the inverter circuit (13) to begin inversion. S5, When the inverter circuit (13) inverts to 5Hz, it starts to output AC voltage to make the fan (2) run; S6, Inverter circuit (13) Inverter output AC380V / 50Hz, fan (2) runs normally, and sends WOR signal to air conditioning control unit (3); S7. If the inverter unit (1) fails to start, it outputs an ERR signal to the air conditioning control unit (3). The air conditioning control unit (3) disconnects the start signal but does not disconnect the first contactor (4). After disconnecting the start signal for 10 seconds, it sends the start signal again. If the air conditioning control unit (3) receives the ERR signal three times in a row, it directly turns off the start signal. S8. If the air conditioning control unit (3) does not receive a WOR or ERR signal 60 seconds after the inverter unit (1) starts, the start signal is cut off. After a delay of 10 seconds, the start signal is given again. If no WOR or ERR signal is received after three consecutive starts, the start signal is turned off directly.

5. A computer-readable storage medium, characterized in that, Used to store computer-readable instructions; when executed, the computer-readable instructions include the steps described in claim 4.

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