A smart air conditioning system for high-speed multiple units

Abstract

The present invention provides a smart air-conditioning system for high-speed multiple units. Each vehicle includes an early warning subsystem, a trend prediction subsystem, and a performance evaluation subsystem, which establish a model and conduct diagnostic evaluation on the health status of air-conditioning equipment, timely guide users to repair and dispose of problems, reduce vehicle failure rates; change the regular maintenance according to the health status diagnosis to condition-based maintenance, save unnecessary maintenance and repair, reduce operation and maintenance time, and lower operation and maintenance costs; establish a database for the entire life cycle and real-time diagnosis, and reduce the cost of the entire life cycle.

Description

Technical Field

[0001] The invention belongs to the technical field of HVAC systems for rail vehicles, and in particular relates to an intelligent air conditioning system for high-speed multiple units. Background Art

[0002] In the past, during the operation and maintenance of rail transit vehicles, the faults of the air conditioning system generally used temperature thresholds, refrigeration system pressure thresholds, and contactor status feedback as direct fault judgment conditions. Once the thresholds were reached or the feedback was lost, the faults were directly reported, and the mechanic needed to perform on-site emergency handling, which affected the vehicle operation and might even lead to serious faults such as passenger evacuation and vehicle replacement. The in-depot inspection and maintenance were generally carried out according to fixed cycles, and could not be scientifically and reasonably arranged according to the differences in the air conditioning status of each vehicle, lacking targeted and preventive maintenance, affecting the vehicle's on-line rate and increasing the vehicle operation and maintenance costs. Summary of the Invention

[0003] The invention aims to solve the problems that rail vehicles cannot be scientifically and reasonably arranged according to the differences in the air conditioning status of each vehicle, lacking targeted and preventive maintenance, affecting the vehicle's on-line rate and increasing the vehicle operation and maintenance costs. Therefore, an intelligent air conditioning system for high-speed multiple units is provided to establish a model and diagnose and evaluate the health status of air conditioning equipment, timely guide users to repair and dispose, reduce vehicle failure rates; change the regular maintenance to condition-based maintenance according to the health status diagnosis, save unnecessary maintenance, reduce operation and maintenance time, and lower operation and maintenance costs; establish a database for the entire life cycle and real-time diagnosis to reduce the overall life cycle cost.

[0004] To achieve the above invention purpose, the invention provides an intelligent air conditioning system for high-speed multiple units. Each vehicle is provided with a first air conditioning subsystem and a second air conditioning subsystem. Each air conditioning subsystem is provided with an air conditioning blower, a filter, a compressor, an air conditioning controller, and a vehicle intelligent screen. It is characterized by including a warning subsystem, a trend prediction subsystem, and a performance evaluation subsystem;

[0005] The warning subsystem includes a front air pressure sampling port, a rear air pressure sampling port, an air pressure difference switch, an air conditioning controller, and a vehicle intelligent screen. The front air pressure sampling port and the rear air pressure sampling port are connected to the air pressure difference switch, and the air pressure difference switch is connected to the air conditioning controller; when the pressure difference value between the front air pressure sampling port and the rear air pressure sampling port reaches the set air pressure difference value, the air pressure difference switch closes the contact and feeds back the pressure difference signal to the air conditioning controller, and the air conditioning controller issues a warning fault signal;

[0006] The trend prediction subsystem includes a first air conditioning subsystem and a second air conditioning subsystem. High-pressure sensors and low-pressure sensors are respectively arranged on the high-pressure side and the low-pressure side of the first air conditioning subsystem and the second air conditioning subsystem. The high-pressure sensors and the low-pressure sensors are connected to an air conditioning controller. The air conditioning controller is used to monitor the high-pressure pressure difference and the low-pressure pressure difference between the first air conditioning subsystem and the second air conditioning subsystem. When both the high-pressure pressure difference and the low-pressure pressure difference exceed the set pressure difference and the duration exceeds the first set time, an air conditioning system refrigerant leakage signal is sent.

[0007] The performance evaluation subsystem includes a first temperature sensor and a second temperature sensor in two adjacent carriages. The first temperature sensor and the second temperature sensor are respectively connected to the air conditioning controllers of the adjacent air conditioning subsystems in the adjacent carriages. The air conditioning controllers of the adjacent air conditioning subsystems in the adjacent carriages are connected together and can communicate with each other. The air conditioning controller is used to judge the abnormal temperature fault in the passenger compartment. When the temperature in the passenger compartment exceeds the target temperature and the temperature difference from the passenger compartment temperature of the other carriage exceeds the set temperature value and lasts for more than the second set time, a temperature abnormal fault signal is sent.

[0008] The air conditioning controller is connected to the vehicle smart screen. The air conditioning controller sends the warning fault signal, the air conditioning system refrigerant leakage signal and the temperature abnormal fault to the vehicle smart screen through the vehicle network.

[0009] Further, the high-pressure pressure difference and the low-pressure pressure difference between the first air conditioning subsystem and the second air conditioning subsystem are judged after the two systems are working normally, with the same operation mode, the same compressor operation frequency, and stable operation for more than 60 s.

[0010] Further, when the air conditioning controller judges the temperature abnormal fault, in summer, if the temperature in the passenger compartment is always higher than the target temperature by more than 3°C, and the temperature in the passenger compartment is above 28°C, and the temperature in the passenger compartment of this carriage is 3°C higher than that of the other carriage, after meeting the above conditions for 30 minutes, a temperature abnormal fault signal of the air conditioning system refrigeration in this carriage is sent; in winter, if the temperature in the passenger compartment is lower than the target temperature by more than 3°C, and the temperature in the passenger compartment is below 18°C, and the temperature in the passenger compartment of this carriage is 3°C lower than that of the other carriage, after meeting the above conditions for 30 minutes, a temperature abnormal fault signal of the air conditioning system heating in this carriage is sent.

[0011] The data transmission types of the present invention are more diverse and standardized. In the past, the air-conditioning system only collected temperature values and system pressure values, which could not support the digital health monitoring system in the big data era. The types of data transmitted by the intelligent air-conditioning system have increased variables such as the change in the atmospheric pressure inside the vehicle, the operating current of the compressor, and the vibration displacement of the motor, realizing all-round and three-dimensional data collection of each component of the air-conditioning system. The availability of the algorithm model of the air-conditioning system is higher. Through multi-scenario simulation tests and multi-line state tracking, the system model has been repeatedly verified and optimized, and clear boundary calculation conditions have been formulated to improve the accuracy of the system model algorithm.

[0012] The air-conditioning controller collects the operating parameters and operating states of each component of the air-conditioning through a temperature sensor, a high and low pressure wave sensor, and a contactor feedback circuit, and transmits them to the vehicle network through Ethernet. The vehicle network sends the air-conditioning data to the on-vehicle and ground PHM hosts. The air-conditioning model algorithm is nested in the host to realize the early warning, prediction, and evaluation of the current health state of the air-conditioning system. Brief Description of the Drawings

[0013] Figure 1 It is the topology diagram of the early warning subsystem;

[0014] Figure 2 It is the topology diagram of the trend prediction subsystem;

[0015] Figure 3 It is the topology diagram of the performance evaluation subsystem;

[0016] Wherein: 1. Air-conditioning blower; 2. Filter screen; 3. Front sampling port of the air pressure difference switch; 4. Rear sampling port of the air pressure difference switch; 5. Air pressure difference switch; 6. Air-conditioning controller; 7. Vehicle intelligent screen; 8. First air-conditioning subsystem; 9. Second air-conditioning subsystem; 10. First high-pressure sensor; 11. First low-pressure sensor; 12. Second high-pressure sensor; 13. Second low-pressure sensor; 14. First compressor; 15. Second compressor; 16. First carriage; 17. Second carriage; 18. First temperature sensor; 19. Second temperature sensor; 20. First target temperature; 21. Second target temperature; 22. First air-conditioning controller; 23. Second air-conditioning controller. Detailed Description of the Invention

[0017] In order to better understand the purpose, structure, and function of the present invention, the following further describes in detail a high-speed train intelligent air-conditioning system of the present invention with reference to the drawings.

[0018] The intelligent air-conditioning system includes an early warning subsystem, a trend prediction subsystem, and a performance evaluation subsystem.

[0019] Refer to Figure 1, the early warning subsystem includes an air-conditioning supply fan 1, a filter screen 2, a front air pressure sampling port 3, a rear air pressure sampling port 4, an air pressure difference switch 5, an air-conditioning controller 6, and a vehicle intelligent screen 7. The front air pressure sampling port 3 and the rear air pressure sampling port 4 are connected to the air pressure difference switch 5, and the air pressure difference switch 5, the air-conditioning controller 6, and the vehicle intelligent screen 7 are connected in sequence. The action value set by the air pressure difference switch 5 is 230 Pa. When the air-conditioning supply fan 1 is working normally, the front air pressure sampling port 3 and the rear air pressure sampling port 4 feed back the air pressures before and after the filter device to the air pressure difference switch 5. When the filter screen assembly 2 is clean, the resistance of the filter device is small, and the pressure difference before and after is small. At this time, the air pressure difference switch 5 is in an off state. When the filter device becomes dirty and blocked, the resistance of the filter screen assembly 2 is large. When the air pressure difference before and after reaches the set air pressure difference value of 230 Pa, the contacts in the air pressure difference switch 5 close, and the early warning fault signal is fed back to the air-conditioning controller 6. The air-conditioning controller 6 sends it to the vehicle intelligent screen 7 through the vehicle network to guide the operation and maintenance personnel to replace it in time. The early warning fault mainly targets the air-conditioning filter screen assembly with frequent daily maintenance operations. A pressure difference sensor is set before and after the air-conditioning filter screen. By using the pressure attenuation value after the filter screen becomes dirty and blocked through maintenance exploration, the action threshold of the pressure difference sensor is preset. When the pressure attenuates after the filter screen becomes dirty and blocked and reaches the threshold, the filter screen dirty and blocked fault is reported. The vehicles with the filter screen dirty and blocked are prompted to arrange operators to prepare materials in advance and formulate an operation plan. After the vehicle enters the warehouse, the operator can quickly board the vehicle to replace it, improving labor efficiency, reducing the operation and maintenance cycle of the vehicle, and at the same time avoiding material waste caused by inconsistent replacement standards due to manual judgment of the filter screen dirty and blocked.

[0020] The trend prediction subsystem includes a first air-conditioning subsystem 8 and a second air-conditioning subsystem 9. The first air-conditioning subsystem 8 includes a first compressor 14, a first high-pressure sensor 10, and a first low-pressure sensor 11. The first high-pressure sensor 10 and the first low-pressure sensor 11 are respectively arranged on the high-pressure side and the low-pressure side of the first unit. The second air-conditioning subsystem 9 includes a second compressor 15, a second high-pressure sensor 12, and a second low-pressure sensor 13. The second high-pressure sensor 12 and the second low-pressure sensor 13 are respectively arranged on the high-pressure side and the low-pressure side of the second unit. The first high-pressure sensor 10, the first low-pressure sensor 11, the second high-pressure sensor 12, and the second low-pressure sensor 13 are connected to the air-conditioning controller 6, and the air-conditioning controller 6 is connected to the vehicle intelligent screen 7. When the first air-conditioning subsystem 8 and the second air-conditioning subsystem 9 are both working normally and in the same operating mode, the first compressor 14 and the second compressor 15 operate at the same frequency. After running stably for more than 60 s, a judgment is made: the high-pressure pressure and low-pressure pressure values of one of the systems are all lower than those of the other system, and at the same time exceed the set pressure difference: the high-pressure pressure difference ≥ 0.25 MPa and the low-pressure pressure difference ≥ 0.15 MPa, and the duration exceeds 30 seconds, that is, the "refrigerant leakage in the air-conditioning system" is reported to remind the operation and maintenance personnel to promptly conduct fault troubleshooting and maintenance after the vehicle enters the warehouse. 30 seconds in this embodiment is the first set time.

[0021] The trend prediction subsystem sets a high-pressure pressure sensor and a low-pressure pressure sensor in the refrigeration system to collect the pressure value of the refrigeration system in real time. Through the trend of the refrigerant pressure curve, it accurately predicts the trend of the system pressure value, anticipates the micro-leakage of the refrigeration pipeline in advance, prevents and repairs in time, and avoids poor online refrigeration, resulting in too high a temperature in the carriage and affecting the operation order.

[0022] The performance evaluation subsystem mainly targets two carriages, namely the first carriage 16 and the second carriage 17. In the first carriage 16, there is a first temperature sensor 18 and a first air-conditioning controller 22. The first temperature sensor 18 is connected to the first air-conditioning controller, and the first carriage 16 sets a first target temperature 20. In the second carriage 17, there is a second temperature sensor 19 and a second air-conditioning controller 23. The second temperature sensor 19 is connected to the second air-conditioning controller 23, and the second carriage 17 sets a second target temperature 21. The first air-conditioning controller 22 and the second air-conditioning controller 23 are connected and can communicate with each other. In summer, if the passenger compartment temperature is always 3°C or more higher than the target temperature, and the passenger compartment temperature is 28°C or more, and through the communication between the first air-conditioning controller 22 and the second air-conditioning controller 23, if the passenger compartment temperature of this carriage is more than 3°C higher than the passenger compartment temperature of the other carriage, after meeting the above conditions and exceeding 30 minutes, report the temperature anomaly fault of the air-conditioning system refrigeration in this carriage. In winter, if the passenger compartment temperature is 3°C or more lower than the target temperature, and the passenger compartment temperature is 18°C or less, and through the communication between the first air-conditioning controller 22 and the second air-conditioning controller 23, if the passenger compartment temperature of this carriage is 3°C lower than the passenger compartment temperature of the other carriage, after meeting the above conditions for 30 minutes, report the temperature anomaly fault of the air-conditioning system heating in this carriage. In this embodiment, 3°C is the set temperature value, and 30 minutes is the second set time.

Claims

1. A smart air conditioning system for high-speed multiple units. Each vehicle is equipped with a first air conditioning subsystem and a second air conditioning subsystem. Each air conditioning subsystem is provided with an air conditioning blower (1), a filter (2), a compressor, an air conditioning controller (6) and a vehicle smart screen (7). It is characterized in that, It includes an early warning subsystem, a trend prediction subsystem and a performance evaluation subsystem; The early warning subsystem includes a front-end air pressure sampling port (3), a rear-end air pressure sampling port (4), an air pressure difference switch (5), an air-conditioning controller (6) and a vehicle intelligent screen (7). The front-end air pressure sampling port (3) and the rear-end air pressure sampling port (4) are connected to the air pressure difference switch (5), and the air pressure difference switch (5) is connected to the air-conditioning controller (6). When the pressure difference between the front-end air pressure sampling port (3) and the rear-end air pressure sampling port (4) reaches the set air pressure difference, the air pressure difference switch (5) closes the contact and feeds back the pressure difference signal to the air-conditioning controller (6), and the air-conditioning controller (6) issues an early warning fault signal; The trend prediction subsystem includes a first air-conditioning subsystem (8) and a second air-conditioning subsystem (9). High-pressure sensors and low-pressure sensors are respectively arranged on the high-pressure side and the low-pressure side of the first air-conditioning subsystem (8) and the second air-conditioning subsystem (9). The high-pressure sensors and the low-pressure sensors are connected to the air-conditioning controller (6). The air-conditioning controller is used to monitor the high-pressure pressure difference and the low-pressure pressure difference between the first air-conditioning subsystem (8) and the second air-conditioning subsystem (9). When the high-pressure pressure difference and the low-pressure pressure difference both exceed the set pressure difference and the duration exceeds the first set time, an air-conditioning system refrigerant leakage signal is issued; The performance evaluation subsystem includes a first temperature sensor (18) and a second temperature sensor (19) in adjacent two carriages. The first temperature sensor (18) and the second temperature sensor (19) are respectively connected to the air-conditioning controllers (6) of the adjacent air-conditioning subsystems in the adjacent carriages. The air-conditioning controllers of the adjacent air-conditioning subsystems in the adjacent carriages are connected together and can communicate with each other. The air-conditioning controller (6) is used to judge the abnormal temperature fault in the passenger compartment. When the passenger compartment temperature exceeds the target temperature and the temperature difference from the passenger compartment temperature of the other carriage exceeds the set temperature value and lasts for more than the second set time, a temperature abnormal fault is sent; The air-conditioning controller (6) is connected to the vehicle intelligent screen (7), and the air-conditioning controller (6) sends the early warning fault signal, the air-conditioning system refrigerant leakage signal and the temperature abnormal fault to the vehicle intelligent screen (7) through the vehicle network.

2. The smart air conditioning system for high-speed multiple units according to claim 1, characterized in that: The judgment of the high-pressure pressure difference and the low-pressure pressure difference between the first air-conditioning subsystem (8) and the second air-conditioning subsystem (9) is carried out after the two systems work normally, have the same operation mode, the same compressor operation frequency, and have been running stably for more than 60 s.

3. The smart air conditioning system for high-speed multiple units according to claim 1, characterized in that: The air-conditioning controller (6) judges the abnormal temperature fault. In summer, if the passenger compartment temperature is always higher than the target temperature by more than 3°C, and the passenger compartment temperature is above 28°C, and the passenger compartment temperature of this carriage is 3°C higher than that of the other carriage, after meeting the above conditions for 30 minutes, an abnormal temperature fault of the air-conditioning system refrigeration in this carriage is sent; In winter, if the passenger compartment temperature is lower than the target temperature by more than 3°C, and the passenger compartment temperature is below 18°C, and the passenger compartment temperature of this carriage is 3°C lower than that of the other carriage, after meeting the above conditions for 30 minutes, an abnormal temperature fault of the air-conditioning system heating in this carriage is sent.

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