Bus control-based two-master multi-slave air conditioning control system for train

Abstract

The application discloses a kind of two main multi-slave air conditioner control systems for train based on bus control, it is related to the field of air conditioner control system for vehicle.System includes: the main manipulator installed in train head, auxiliary manipulator installed in train tail and the sub-manipulator and roof-mounted air conditioning system installed in each compartment;Main manipulator includes main manipulator ECU, control panel, communication interface, encoder interface and power supply interface;Auxiliary manipulator includes auxiliary manipulator ECU, control panel, communication interface, encoder interface and power supply interface;Sub-manipulator includes sub-manipulator ECU, control panel, communication interface, encoder interface, power supply interface and roof-mounted air conditioner connection port;Roof-mounted air conditioning system includes top three-in-one controller, air output device, power supply interface and sub-manipulator connection port.Main manipulator, auxiliary manipulator, sub-manipulator and roof-mounted air conditioning system of the application work cooperatively, improve the flexibility, convenience and work reliability of each compartment air conditioning system control.

Description

Technical Field

[0001] This invention relates to the field of vehicle air conditioning control system technology, and in particular to a bus-based two-master-multiple-slave air conditioning control system for trains. Background Technology

[0002] A train air conditioning control system is a device used to regulate and control the temperature, humidity, and ventilation inside a train, providing a comfortable riding environment and ensuring passengers have a pleasant journey. The goal of the train air conditioning control system is to provide passengers with a comfortable, healthy, and safe environment, ensuring suitable temperature and humidity within the carriages under different climatic conditions. By precisely controlling and monitoring air conditions, the train air conditioning control system can provide passengers with a satisfactory riding experience and improve the comfort of train travel.

[0003] The train's air conditioning control system has the following functions: Temperature control: The train's air conditioning system can adjust the temperature inside the carriage according to passenger needs and environmental conditions to ensure passenger comfort; the system can automatically sense and adjust the temperature to ensure a suitable temperature in different weather and seasons. Humidity control: The air conditioning system can monitor and regulate the humidity inside the carriage; based on humidity and temperature sensor signals, it uses a specialized control algorithm to control the speed of the compressor, condenser fan, and evaporator fan, maintaining a suitable humidity level and preventing the air from being too dry or humid, providing a more comfortable riding experience. Air circulation and ventilation: The air conditioning system provides good air circulation through fans and ducts; it can introduce fresh air into the carriage and expel stale air, keeping the air fresh; this helps reduce odors and bacterial growth, improving air quality. Air filtration: Train air conditioning systems are usually equipped with filters that can effectively filter dust, particulate matter, bacteria, and odor substances in the air; this helps improve the air quality inside the carriage, providing a cleaner and healthier environment. Energy saving and environmental protection: The air conditioning control system optimizes the cooling cycle, fan operation, and control strategies to minimize energy consumption and improve energy efficiency. It also helps reduce environmental impact and lower greenhouse gas emissions. Automatic control and monitoring: The train's air conditioning system is equipped with intelligent control devices that automatically adjust and monitor temperature, humidity, and air quality within the carriages. It makes real-time adjustments based on sensor feedback to ensure optimal passenger comfort during the journey. The train's air conditioning control system features temperature control, humidity control, air circulation and ventilation, air filtration, energy saving and environmental protection, as well as automatic control and monitoring functions, aiming to provide passengers with a comfortable travel environment and a pleasant riding experience.

[0004] However, the implementation of the train air conditioning control system has also exposed various disadvantages and problems. One important issue is the flexibility and reliability of the system. Because the air conditioning system requires separate control of each intermediate carriage, and each carriage has slightly different requirements for temperature, humidity, and airflow, its flexibility and convenience are limited. Furthermore, logical layering of the various operators is necessary to achieve better overall control and ultimately ensure operational reliability. Summary of the Invention

[0005] To address the problems mentioned in the background art, the present invention provides a bus-based two-master-multiple-slave air conditioning control system for trains, so as to improve the flexibility, convenience and reliability of the air conditioning system control in each carriage.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a bus-based two-master-multiple-slave air conditioning control system for trains, comprising: a master controller installed at the head of the train, an auxiliary controller installed at the tail of the train, and sub-controllers and a roof-mounted air conditioning system installed in each carriage.

[0008] The main controller includes a main controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the main controller ECU; the auxiliary controller includes an auxiliary controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the auxiliary controller ECU; the sub-controller includes a sub-controller ECU and a control panel, communication interface, encoder interface, power supply interface, and roof air conditioning connection port connected to the sub-controller ECU; the roof air conditioning system includes a roof-mounted three-in-one controller and an airflow output device, power supply interface, and sub-controller connection port connected to the roof-mounted three-in-one controller.

[0009] The power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple rooftop air conditioning systems are all connected to the vehicle control power supply for power supply; the encoder interfaces of the main controller, auxiliary controller, and multiple sub-controllers are all connected to the 24V vehicle control power supply, and are distributed through the main controller ECU, auxiliary controller ECU, and each sub-controller ECU to collect high and low level switch signals to identify the main controller, auxiliary controller, and each sub-controller number; the communication interfaces of the main controller, auxiliary controller, and multiple sub-controllers are connected through a CAN bus to realize control command communication and signal transmission; the rooftop air conditioning connection port of the sub-controller is connected to the sub-controller connection port of the rooftop air conditioning system; each sub-controller is used to control the rooftop air conditioning system of this compartment according to the control commands input from the control panel of the main controller, auxiliary controller, or multiple sub-controllers.

[0010] Optionally, the power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple roof-mounted air conditioning systems are respectively connected to the 24V and 0V vehicle control power supply through two power supply lines.

[0011] Optionally, the communication interfaces of the main controller, auxiliary controller, and multiple sub-controllers are respectively connected to the CAN2H and CAN2L dual-channel CAN buses to enable communication with other controllers.

[0012] Optionally, the main controller, auxiliary controller, and multiple sub-controllers have the same command authority, and other controllers can only send updated control commands 5 seconds after the latest control command is sent.

[0013] Optionally, the airflow output device of the rooftop air conditioning system includes: a temperature and humidity sensor, a pressure sensor, a compressor, an evaporator fan, a condenser fan, an expansion valve, and a reversing valve.

[0014] Optionally, the control of the roof-mounted air conditioning system in this carriage includes cold and hot ventilation control, air volume control, wind speed control, wind direction control, temperature and humidity control, and internal and external circulation control.

[0015] Optionally, the main controller further includes an emergency ventilation interface connected to the main controller ECU; the auxiliary controller further includes an emergency ventilation interface connected to the auxiliary controller ECU; the emergency ventilation interfaces of the main controller and the auxiliary controller are each connected to the high-level emergency ventilation of the whole vehicle to realize emergency ventilation of each car compartment.

[0016] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0017] The present invention provides a bus-controlled train air conditioning control system with two master and multiple slave components, comprising: a master controller installed at the head of the train, an auxiliary controller installed at the tail of the train, and sub-controllers and a roof-mounted air conditioning system installed in each carriage. The master controller includes a master controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the master controller ECU. The auxiliary controller includes an auxiliary controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the auxiliary controller ECU. The sub-controllers include a sub-controller ECU and a control panel, communication interface, encoder interface, power supply interface, and a roof-mounted air conditioning connection port connected to the sub-controller ECU. The roof-mounted air conditioning system includes a roof-mounted three-in-one controller and an airflow output device, power supply interface, and sub-controller connection port connected to the roof-mounted three-in-one controller. This invention utilizes the master controller, auxiliary controller, sub-controllers, roof-mounted air conditioning system, and their electrical connections to achieve control of the air conditioning systems in multiple carriages of the train, improving the flexibility, convenience, and reliability of the control of the air conditioning systems in each carriage, and achieving a better overall control effect. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a bus-controlled train air conditioning system with two master and multiple slave components, provided as an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a bus-based two-master-multiple-slave air conditioning control system for trains, so as to improve the flexibility, convenience and reliability of the air conditioning system control in each carriage.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides a bus-based dual-master, multi-slave air conditioning control system for trains. This system utilizes one controller at each of the train's head and tail sections to control the air conditioning systems of multiple carriages. The system includes a master controller installed at the head of the train, an auxiliary controller installed at the tail, and sub-controllers and roof-mounted air conditioning systems installed in each carriage. By independently controlling the master, auxiliary, and sub-controllers, this system enables control of the air conditioning systems in multiple carriages (including the head, tail, and middle carriages), improving operational flexibility, convenience, and reliability, ultimately achieving better overall control performance.

[0024] The main controller includes a main controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the main controller ECU. The auxiliary controller includes an auxiliary controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the auxiliary controller ECU. The sub-controller includes a sub-controller ECU and a control panel, communication interface, encoder interface, power supply interface, and rooftop air conditioning connection port connected to the sub-controller ECU. The rooftop air conditioning system includes a rooftop three-in-one controller and airflow output devices, a power supply interface, and a sub-controller connection port connected to the rooftop three-in-one controller. The rooftop three-in-one controller integrates a compressor controller, a fan controller, and a DC-DC controller. The airflow output devices include a compressor, an evaporator fan, and a condenser fan, as well as temperature and humidity sensors, pressure sensors, expansion valves, and reversing valves, etc., wherein the electronic control components are connected via power supply and communication interfaces.

[0025] The power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple rooftop air conditioning systems are all connected to the vehicle control power supply for power. The encoder interfaces of the main controller, auxiliary controller, and multiple sub-controllers are all connected to the 24V vehicle control power supply, and are identified by high and low level switching signals collected by the main controller ECU, auxiliary controller ECU, and each sub-controller ECU. The communication interfaces of the main controller, auxiliary controller, and multiple sub-controllers are connected via a CAN bus to realize control command communication and signal transmission. The rooftop air conditioning connection port of the sub-controllers is connected to the sub-controller connection port of the rooftop air conditioning system. Each sub-controller is used to control the rooftop air conditioning system of this compartment according to the control commands input from the control panels of the main controller, auxiliary controller, or multiple sub-controllers. Control of the rooftop air conditioning system includes cooling and heating ventilation control, air volume control, fan speed control, air direction control, temperature and humidity control, and internal and external circulation control.

[0026] Specifically, the power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple rooftop air conditioning systems are respectively connected to the 24V and 0V vehicle control power supply through two power supply lines to supply power to each controller and the rooftop air conditioning system.

[0027] The communication interfaces of the main controller, auxiliary controller, and sub-controllers are connected via a CAN bus for communication, enabling command coordination and signal transmission. In addition, the rooftop air conditioning system and the sub-controllers also communicate internally via the CAN bus. Specifically, the communication interfaces of the main controller, auxiliary controller, and multiple sub-controllers are respectively connected to dual-channel CAN buses (CAN2H and CAN2L) to enable communication with other controllers.

[0028] The encoder interfaces of the main and auxiliary controllers, as well as multiple sub-controllers, can be connected to the 24V vehicle control power supply. Each controller's ECU collects high and low level switch signals to identify its number. These high and low level switch signals are pre-programmed onto the wiring harness. Once the controller is connected to the corresponding harness, the switch signal acquisition via the harness encoding interface identifies whether the controller is the main, auxiliary, or sub-controller, and its number. Each controller's ECU collects the high and low level switch signals via a circuit board and reads the corresponding switch code. For example, a switch signal code of 0 indicates a main controller, and a code of 1 indicates an auxiliary controller. The main controller is located at the front of the train, and the auxiliary controllers at the rear. Both can control the sub-controllers via their numbers. Each sub-controller receives commands from the main and auxiliary controllers to control the air conditioning in each train car.

[0029] Control panels are located at the front, rear, and middle of the train cars. The control panel at the front, also known as the main control panel, controls the entire train's air conditioning system, while the control panel at the rear, also known as the auxiliary control panel, also controls the overall air conditioning system. The main and auxiliary controls can switch braking priorities, while the control panels in the middle cars can only control the air conditioning system of their respective cars.

[0030] The control priorities of the primary and secondary controllers can be automatically switched. If the primary and secondary controllers issue commands simultaneously, the secondary controller executes the last or most recent command received in the order it was received. For example, if the primary controller sends a cooling command first, and the secondary controller sends a heating command later, the priority automatically switches to the secondary controller's command, replacing the primary controller's command priority. If the primary controller then changes its command to a ventilation command, the primary controller's command will then be executed. Furthermore, the secondary controller can only operate effectively 5 seconds after the primary controller issues a command. This ensures stable signal switching and improves system operability. Simultaneously, operators can flexibly exchange control between the primary and secondary controllers, enhancing the convenience of the control system.

[0031] The sub-controller can only operate and switch priorities 5 seconds after the main and auxiliary controllers issue commands. When not in operation, the sub-controller receives control commands from the main and auxiliary controllers and controls the air conditioning in the corresponding car according to these control commands or commands issued by the operator through the car control panel, thereby adjusting the fan speed, air volume, etc.

[0032] Furthermore, the main controller of this invention also includes an emergency ventilation interface connected to the main controller ECU; the auxiliary controller also includes an emergency ventilation interface connected to the auxiliary controller ECU; the emergency ventilation interfaces of both the main controller and the auxiliary controller are connected to the high-level emergency ventilation signal of the entire vehicle to achieve emergency ventilation in each carriage. When the train passes through a tunnel, the vehicle control system will give a corresponding emergency ventilation switch signal, and the main and auxiliary controllers will collect the high-level emergency ventilation signal from the vehicle system to achieve emergency ventilation in the carriages.

[0033] Figure 1 This illustration shows a specific embodiment of a bus-based train air conditioning control system with two master and multiple slave components, where the solid black lines represent circuit connection lines.

[0034] like Figure 1As shown, the bus-controlled train air conditioning control system with two master and multiple slaves includes a master controller (1), which specifically includes a master controller ECU, a control panel, a communication interface, an encoder interface, a power supply interface, and a line connection to the outside world; slave controllers (2), (3), (4), (5), (6), (7), (8), and (9), which specifically include a slave controller ECU, a control panel, a communication interface, an encoder interface, a roof air conditioning connection port, and a line connection to the outside world; an auxiliary controller (10), which specifically includes an auxiliary controller ECU, a control panel, a communication interface, an encoder interface, a power supply interface, and a line connection to the outside world; and a roof air conditioning system (11), (12), (13), (14), (15), (16), (17), and (18), which specifically includes a roof three-in-one controller, an airflow output device, a power supply interface, a slave controller connection port, and a line connection to the outside world. The main controller (1), auxiliary controller (10), sub-controllers (2), (3), (4), (5), (6), (7), (8), (9), and roof-mounted air conditioning systems (11), (12), (13), (14), (15), (16), (17), and (18) are all connected to the vehicle control power supply (19). The encoder interfaces of the main controller, auxiliary controller, and multiple sub-controllers (the main and auxiliary controllers also include emergency ventilation interfaces) can be connected to the 24V vehicle control power supply (20) (which also serves as the high-level emergency ventilation for the vehicle). This invention's system can achieve logical hierarchical control of the entire train's air conditioning system, and compared to traditional air conditioning control systems, it balances reliability, flexibility, and convenience.

[0035] The communication interfaces CAN2H and CAN2L of the main controller (1) are used to communicate with other controllers and external devices; the encoder interface is used to identify the controller. The main controller ECU determines its role by reading the encoder interface signal and realizes the interchange of multiple controllers. In addition, the encoder interfaces of the main and auxiliary controllers (one of which is used as an emergency ventilation interface) are also connected to the high level of the vehicle's emergency ventilation. If emergency ventilation is required, the vehicle controller can issue an emergency ventilation command to the main and auxiliary controllers through the communication line and send the command to the sub-controllers (2), (3), (4), (5), (6), (7), (8), (9). The sub-controllers then control the roof air conditioning system (11), (12), (13), (14), (15), (16), (17), (18) to realize the emergency ventilation of the vehicle; the power supply interface is connected to the 24V and 0V vehicle control power supply (19) respectively to supply power to multiple controllers. The main controller (1) can control other controllers to control their respective air conditioning systems according to the operator's instructions. The functions of each controller can be interchanged and they are identified by coding. The main controller and the auxiliary controller can jointly control the air conditioning system. Other controllers can only start controlling the system 5 seconds after the command is sent.

[0036] The auxiliary controller (10) functions similarly to the main controller (1). The main controller and the auxiliary controller can jointly control the air conditioning system. Each controller has the same command priority and can operate as long as it is idle. Other controllers need to wait 5 seconds after the latest controller command is issued before they can control the system. This ensures operational flexibility and reliability. The auxiliary controller (10) includes a control panel, a communication interface, an encoder interface, a power supply interface, and an emergency ventilation interface. The communication interface is connected to CAN2H and CAN2L to enable communication with other controllers and external systems. The encoder interface enables controller identification. The auxiliary controller ECU determines its role by reading the encoder interface signal, allowing multiple controllers to switch roles. The power supply interface is connected to the 24V and 0V vehicle control power supplies to power the auxiliary controller. The auxiliary controller can control the sub-controllers to control their respective rooftop air conditioning systems according to the instructions issued by the operator on the control panel. The main controller and the auxiliary controller can jointly control the air conditioning system. The controllers have the same command authority. Other controllers can only send updated commands 5 seconds after the latest command is sent.

[0037] Sub-controllers (2), (3), (4), (5), (6), (7), (8), and (9) each have their own communication interfaces connected to CAN2H and CAN2L respectively, for communication with other controllers; the encoder interface enables controller identification, and the sub-controller ECU identifies its own position and role by reading the encoder interface signal, enabling switching between multiple controllers; each sub-controller corresponds to its own rooftop air conditioning system, and transmits information to its respective rooftop air conditioning system (11), (12), (13), (14), (15), (16), (17), and (18) through the rooftop air conditioning connection port. After receiving control commands from the main controller (1), the auxiliary controller (10), and the commands issued by the operator on the function panel of the middle train car, the sub-controllers (2), (3), (4), (5), (6), (7), (8), and (9) process the signals and transmit the corresponding signals to the rooftop air conditioning system through the rooftop air conditioning connection port to control the air conditioning of the middle train car.

[0038] The rooftop air conditioning systems (11), (12), (13), (14), (15), (16), (17), and (18) each include a sub-controller connection port and a power supply interface. The sub-controller connection port is used to connect to the sub-controller and receive control commands issued by the sub-controller; the power supply interface is connected to the 24V and 0V vehicle control power supply respectively to supply power to the rooftop air conditioning system. After receiving commands from the corresponding sub-controllers (2), (3), (4), (5), (6), (7), (8), and (9), the rooftop air conditioning systems (11), (12), (13), (14), (15), (16), (17), and (18) respectively, adjust the temperature, humidity, air volume, air speed, air direction, and internal / external circulation.

[0039] In this invention, the power supply interface uses two power supply lines connected to the 24V and 0V vehicle control power supply respectively to power the various controllers and the roof-mounted air conditioning system. The communication interface uses dual-channel CAN to enable communication between the controllers and between each controller and its respective roof-mounted air conditioning system. The encoder interface uses several switch signals to encode each controller. For example, three switches can encode up to 0-7, corresponding to binary (000001010011100101110111).

[0040] In this invention, the various controllers interact via a CAN bus. The master and auxiliary controllers send commands, receive information from the sub-controllers, and perform display, alarm, and priority switching logic. The sub-controllers receive commands, simultaneously send fault information, and execute command logic and priority switching logic. The emergency ventilation high-level signal is a high-level valid signal provided by the vehicle controller via hard-wired connection. The master and auxiliary controllers acquire this high-level signal and issue a forced ventilation command. Upon receiving the command, the sub-controllers execute the forced ventilation. Therefore, this invention effectively improves the flexibility, convenience, and reliability of the air conditioning system control in each carriage.

[0041] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bus-based train air conditioning control system with two master and multiple slave components, characterized in that, include: The main control unit is installed at the head of the train, the auxiliary control unit is installed at the tail of the train, and the sub-control units and rooftop air conditioning system are installed in each carriage. The main controller includes a main controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the main controller ECU; the auxiliary controller includes an auxiliary controller ECU and a control panel, communication interface, encoder interface, and power supply interface connected to the auxiliary controller ECU; the sub-controller includes a sub-controller ECU and a control panel, communication interface, encoder interface, power supply interface, and rooftop air conditioning connection port connected to the sub-controller ECU; the rooftop air conditioning system includes a rooftop three-in-one controller and an airflow output device, power supply interface, and sub-controller connection port connected to the rooftop three-in-one controller; the rooftop three-in-one controller integrates a compressor controller, a fan controller, and a DC-DC controller; The power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple rooftop air conditioning systems are all connected to the vehicle control power supply for power supply; the encoder interfaces of the main controller, auxiliary controller, and multiple sub-controllers are all connected to the 24V vehicle control power supply, and are distributed through the main controller ECU, auxiliary controller ECU, and each sub-controller ECU to collect high and low level switch signals to identify the main controller, auxiliary controller, and each sub-controller number; the communication interfaces of the main controller, auxiliary controller, and multiple sub-controllers are connected through a CAN bus to realize control command communication and signal transmission; the rooftop air conditioning connection port of the sub-controller is connected to the sub-controller connection port of the rooftop air conditioning system; each sub-controller is used to control the rooftop air conditioning system of this compartment according to the control commands input from the control panel of the main controller, auxiliary controller, or multiple sub-controllers. The control priorities of the master controller and the slave controller can be switched automatically; if the master controller and the slave controller issue commands at the same time, the slave controller will execute the last or latest command according to the order in which the commands are received. The main controller, auxiliary controller, and multiple sub-controllers have the same command authority. The latest control command can only be sent by other controllers 5 seconds later. The main controller also includes an emergency ventilation interface connected to the main controller ECU; the auxiliary controller also includes an emergency ventilation interface connected to the auxiliary controller ECU; the emergency ventilation interfaces of the main controller and the auxiliary controller are both connected to the high-level emergency ventilation of the whole vehicle to realize emergency ventilation of each car compartment.

2. The bus-based train air conditioning control system with two master and multiple slave components according to claim 1, characterized in that, The power supply interfaces of the main controller, auxiliary controller, multiple sub-controllers, and multiple roof-mounted air conditioning systems are respectively connected to the 24V and 0V vehicle control power supply through two power supply lines.

3. The bus-based train air conditioning control system with two master and multiple slave components according to claim 1, characterized in that, The main controller, auxiliary controller, and multiple sub-controllers each have their communication interfaces connected to the CAN2H and CAN2L dual-channel CAN buses, respectively, to enable communication with other controllers.

4. The bus-based train air conditioning control system with two master and multiple slave components according to claim 1, characterized in that, The airflow output devices of the rooftop air conditioning system include: a temperature and humidity sensor, a pressure sensor, a compressor, an evaporator fan, a condenser fan, an expansion valve, and a reversing valve.

5. The bus-based train air conditioning control system with two master and multiple slave components according to claim 1, characterized in that, The control of the roof-mounted air conditioning system in this carriage includes control of hot and cold ventilation, air volume, wind speed, wind direction, temperature and humidity, and internal and external circulation.

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