A control method of a rail vehicle air conditioning system and a rail vehicle air conditioning system

Abstract

The application discloses a control method of a rail vehicle air conditioning system and the rail vehicle air conditioning system. The rail vehicle air conditioning system comprises a shell, a return air inlet for introducing return air into a carriage is arranged on the shell, a return air valve is arranged on the return air inlet, a ventilator is arranged in the shell and is used for sending the return air introduced by the return air inlet into the carriage. During the ventilation process, the opening degree H of the return air valve is controlled according to the operating frequency P of the ventilator. In the application, the control of the return air valve is added during the ventilation process, so that the return air in the carriage can be treated by the air conditioning system and then is delivered back into the carriage to complete the circulation, the number of times of adjusting fresh air of the air conditioning system is reduced, the number of times of action of a fresh air valve is reduced, and the probability of failure of the fresh air valve is reduced. According to the operating frequency of the ventilator, the opening degree of the return air valve is controlled, so that the operating frequency of the ventilator is matched with the opening degree of the return air valve, and the waste of energy of the ventilator caused by the too high operating frequency of the ventilator and the too small opening degree of the return air valve is avoided.

Description

Technical Field

[0001] This invention belongs to the field of mechanical equipment technology, specifically, it relates to a control method for a rail vehicle air conditioning system and a rail vehicle air conditioning system. Background Technology

[0002] With social development, technological advancements, and improved living standards, rail vehicles have become an important mode of transportation. These include railway systems such as high-speed rail, bullet trains, and regular passenger trains, as well as urban rail systems like subways, light rail, and monorails. Currently, while passengers have higher demands for service, they also have increasingly higher requirements for the comfort and air quality inside rail vehicle carriages, especially for long-distance travel.

[0003] The comfort and air quality inside rail vehicle carriages mainly depend on the rail vehicle air conditioning system. This requires the rail vehicle air conditioning system to develop towards intelligence, and also requires the rail vehicle air conditioning system to be reliable, not easily damaged, and energy-saving and emission-reducing.

[0004] In rail vehicles, the air conditioning system adopts a modular structure, with the entire unit located at the bottom or top of the car. The air conditioning system is connected to the fresh air inlets and return air inlets on the main unit body via fresh air ducts and return air ducts.

[0005] After being processed by the air conditioning system, the air is delivered into the passenger compartment through the fresh air inlet to regulate the temperature and humidity. Air from the passenger compartment then enters the main unit through the return air inlet, mixes with the fresh air, exchanges heat with the evaporator, and is then returned to the passenger compartment by the fan, completing the cooling cycle. In other words, during ventilation, the air conditioning system introduces fresh outdoor air through the fresh air inlet and return air from the passenger compartment through the return air inlet. The fresh and return air mix and are then delivered into the passenger compartment through the fan and air vents.

[0006] To meet the cooling demands under high loads, the rated cooling capacity of rail vehicle air conditioning systems is generally set relatively large. However, for rail vehicles, the cooling capacity required to maintain the interior temperature varies considerably depending on the time of day, season, and number of passengers. Under low heat load conditions, the rail vehicle air conditioning system needs to reduce its cooling capacity output to match the lower heat load.

[0007] When controlling the cooling output of the air conditioning system in rail vehicles to different levels, it is necessary to frequently adjust the status of the fresh air valve and the frequency of the ventilation fan. This increases the probability of fresh air valve failure; furthermore, the control process of the ventilation fan is redundant, the control accuracy is relatively poor, and the energy consumption is high, which is not conducive to energy conservation and emission reduction in rail vehicles.

[0008] In view of this, the present invention is hereby proposed. Summary of the Invention

[0009] The purpose of this invention is to provide a control method for a rail vehicle air conditioning system, thereby reducing fresh air valve failures and minimizing ventilator energy consumption. Another purpose of this invention is to provide a rail vehicle air conditioning system controlled by the method of this invention, achieving stable operation, reduced malfunctions, simple and accurate control, and energy conservation and emission reduction.

[0010] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0011] A control method for a rail vehicle air conditioning system, the rail vehicle air conditioning system includes a housing, a return air inlet for introducing return air from the car body, a return air valve on the return air inlet, and a fan installed inside the housing for delivering the return air introduced from the return air inlet into the car body. During ventilation, the opening degree H of the return air valve is controlled according to the operating frequency P of the fan.

[0012] Furthermore, the opening degree H of the return air valve is positively correlated with the operating frequency P of the fan.

[0013] Furthermore, a preset calculation model H = f(P) is used, where f(P) is a monotonically increasing function. The operating frequency P of the ventilator is substituted into the calculation model to obtain the opening degree H of the return air valve.

[0014] Furthermore, the rail vehicle air conditioning system also includes a fresh air inlet on the housing for introducing fresh air from outside the car. The fresh air inlet is equipped with a fresh air valve. After controlling and selecting the opening degree S of the fresh air valve, the operating frequency P of the ventilation fan corresponding to the opening degree S and the opening degree H of the return air valve corresponding to the operating frequency P are selected.

[0015] Furthermore, one opening degree S of the fresh air valve corresponds to at least one set of operating frequencies P of the ventilation fans and the opening degree H of the return air valve.

[0016] Furthermore, one opening degree S of the fresh air valve corresponds to the operating frequency P of several sets of ventilation fans and the opening degree H of the return air valve.

[0017] Furthermore, the rail vehicle air conditioning system also includes an air conditioning system compressor, obtains the operating frequency F of the air conditioning system compressor, and selects the operating frequency P of a set of ventilators and the opening degree H of the return air valve based on the obtained operating frequency F.

[0018] Furthermore, the operating frequency P of the control fan and the opening degree H of the return air valve are positively correlated with the obtained operating frequency F of the air conditioning system compressor.

[0019] Preferably, the operating frequencies of the air conditioning system compressor are preset to F1, F2, and F3, where F1 > F2 > F3.

[0020] If the operating frequency F of the air conditioning system compressor is greater than or equal to F1, then the operating frequency P of the control fan should be 50Hz.

[0021] If the operating frequency of the air conditioning system compressor is F2≤F<F1, then the operating frequency of the control fan should be 40Hz≤P<50Hz.

[0022] If the operating frequency of the air conditioning system compressor is F3≤F<F2, then the operating frequency of the control fan is 35Hz≤P<40Hz.

[0023] If the operating frequency F of the air conditioning system compressor is obtained as F < F3, then the operating frequency of the control fan is 30Hz ≤ P < 35Hz.

[0024] Furthermore, the passenger capacity Q inside the vehicle is obtained, and the opening degree S of the fresh air valve is selected based on the obtained passenger capacity Q.

[0025] Furthermore, the opening degree S of the fresh air valve is positively correlated with the obtained passenger capacity Q;

[0026] Preferably, the opening degree S of the fresh air valve is controlled to be 25%-100%;

[0027] Preferably, the preset passenger capacities are Q1, Q2, and Q3, where Q1 < Q2 < Q3.

[0028] If the obtained passenger capacity is 0 < Q < Q1, then the opening degree S of the fresh air valve should be controlled at 25%.

[0029] If the obtained passenger capacity Q1≤Q<Q2, then the opening degree S of the fresh air valve should be controlled to be 25%-50%.

[0030] If the obtained passenger capacity Q2≤Q<Q3, then the opening degree S of the fresh air valve should be controlled to be 50%-75%.

[0031] If the obtained passenger capacity Q≥Q3, then the opening degree S of the fresh air valve should be controlled to be 75%-100%.

[0032] The present invention also provides an air conditioning system for rail vehicles, which is controlled by the above-described control method.

[0033] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0034] In this invention, the return air valve is controlled during the ventilation process, so that the return air in the carriage can be processed by the air conditioning system and then transported back into the carriage to complete the circulation. This reduces the number of times the air conditioning system adjusts the fresh air, that is, reduces the number of times the fresh air valve is activated, and lowers the probability of fresh air valve failure.

[0035] In this invention, the opening degree of the return air valve is controlled according to the operating frequency of the ventilator, so that the operating frequency of the ventilator is matched with the opening degree of the return air valve, thus avoiding the waste of ventilator energy caused by the ventilator operating frequency being too high and the opening degree of the return air valve being too small.

[0036] The rail vehicle air conditioning system of the present invention is controlled by the control method of the present invention, which makes the rail vehicle air conditioning system less prone to failure, and has both good temperature regulation effect and energy saving.

[0037] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0038] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0039] Figure 1 This is a flowchart of a control method according to the present invention.

[0040] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] This invention discloses a control method for a rail vehicle air conditioning system. The rail vehicle air conditioning system includes: a housing, with a return air inlet for introducing return air from the car and a fresh air inlet for introducing fresh air from outside the car. The return air inlet is equipped with an adjustable-opening return air valve, and the fresh air inlet is equipped with an adjustable-opening fresh air valve. A ventilation fan is installed inside the housing to deliver the return air and fresh air introduced through the return air inlet and fresh air inlet into the car.

[0045] In this invention, the control method for the air conditioning system of a rail vehicle includes: during ventilation, controlling the opening degree H of the return air valve according to the operating frequency P of the ventilator.

[0046] Specifically, during the ventilation process, the return air valve is opened, and the air in the carriage enters the casing through the return air inlet. It mixes with the fresh air and then exchanges heat with the evaporator. Under the action of the fan, it is blown back into the carriage to complete the refrigeration cycle.

[0047] In this invention, the return air valve is controlled during the ventilation process, so that the return air in the carriage can be processed by the air conditioning system and then transported back into the carriage to complete the circulation. This reduces the number of times the air conditioning system adjusts the fresh air, that is, reduces the number of times the fresh air valve is activated, and lowers the probability of fresh air valve failure.

[0048] In this invention, the opening degree of the return air valve is controlled according to the operating frequency of the ventilator, so that the operating frequency of the ventilator is matched with the opening degree of the return air valve, thus avoiding the waste of ventilator energy caused by the ventilator operating frequency being too high and the opening degree of the return air valve being too small.

[0049] In one embodiment of the present invention, the opening degree H of the return air valve is positively correlated with the operating frequency P of the fan. That is, the higher the operating frequency P of the fan, the higher the opening degree H of the return air valve.

[0050] In the control method of this embodiment, the higher the operating frequency P of the fan, the stronger its air delivery capacity. At this time, the opening degree H of the return air valve is also larger, so that more return air is introduced into the casing through the return air inlet, and this part of the return air can be fully output by the fan. This not only improves the heat exchange efficiency in the carriage, but also makes full use of the fan, avoiding the waste of energy caused by the fan not being fully and reasonably utilized even though the operating frequency is high.

[0051] As another embodiment of the present invention, the control method of the present invention includes:

[0052] The preset calculation model is H = f(P), where f(P) is a monotonically increasing function. The operating frequency P of the ventilator is substituted into the calculation model to obtain the opening degree H of the return air valve.

[0053] In this embodiment, by using a preset calculation model H = f(P), the opening degree H of the return air valve can be controlled relatively accurately according to the operating frequency P of the ventilator during the operation of the rail vehicle air conditioning system, thereby ensuring that the ventilator is fully utilized and avoiding energy waste.

[0054] As one implementation method of this embodiment, the control method of the rail vehicle air conditioning system includes:

[0055] The operating frequency P of the control fan is 30-50Hz, and the opening degree H of the return air valve is 33.33%-66.67%.

[0056] In this embodiment, the operating frequency range of the ventilator and the opening range of the return air valve are reasonably set, so that the operating frequency of the ventilator and the opening of the return air valve can be adjusted within a reasonable range, thus ensuring the stability of the rail vehicle air conditioning system.

[0057] As another embodiment of this invention, the control method for the air conditioning system of a rail vehicle includes:

[0058] When the operating frequency P of the ventilator is 30Hz, the opening degree H of the return air valve is controlled at 33.33%.

[0059] When the operating frequency P of the ventilator is 30-35Hz, the opening degree H of the return air valve is controlled at 33.33%-38.89%.

[0060] When the operating frequency P of the ventilator is 35-40Hz, the opening degree H of the return air valve is controlled to be 38.89%-50.00%.

[0061] When the operating frequency P of the ventilator is 40-50Hz, the opening degree H of the return air valve is controlled to be 50.00%-66.67%.

[0062] In this embodiment, the opening range of the return air valve is reasonably controlled for different ranges of fan operating frequencies. This allows the rail vehicle air conditioning system to make reasonable and intelligent adjustments to the opening of the return air valve according to the range of the fan operating frequency, making full and reasonable use of the current fan operating frequency and avoiding energy waste by the fan.

[0063] As another embodiment of the present invention, the control method for the air conditioning system of a rail vehicle includes:

[0064] After controlling and selecting the opening degree S of the fresh air valve, select the fan operating frequency P corresponding to the opening degree S, and the return air valve opening degree H corresponding to the operating frequency P.

[0065] In this embodiment, after selecting the opening degree S of the fresh air valve, the operating frequency P of the ventilation fan and the opening degree H of the return air valve corresponding to the opening degree S are selected, making the whole control process simple and quick, and avoiding redundant control between the fresh air valve and the return air valve.

[0066] As one implementation method of this embodiment, the opening degree S of the fresh air valve corresponds to at least one set of operating frequencies P of the ventilation fans and the opening degree H of the return air valve.

[0067] Preferably, one opening degree S of the fresh air valve corresponds to the operating frequency P of several sets of fans and the opening degree H of the return air valve. For example, one opening degree S corresponds to the operating frequency P of four sets of fans and the opening degree H of the return air valve.

[0068] Furthermore, when the opening degree S of the fresh air valve is 25%, the corresponding operating frequency P of the four sets of ventilation fans and the opening degree H of the return air valve are:

[0069] The operating frequency P of the ventilation fan is 30Hz, and the opening degree H of the return air valve is 33.33%.

[0070] The operating frequency P of the ventilation fan is 35Hz, and the opening degree H of the return air valve is 38.89%.

[0071] The operating frequency P of the ventilation fan is 40Hz, and the opening degree H of the return air valve is 50.00%.

[0072] The operating frequency P of the ventilation fan is 50Hz, and the opening degree H of the return air valve is 66.67%.

[0073] When the opening degree S of the fresh air valve is 50%, the corresponding operating frequency P of the four sets of ventilation fans and the opening degree H of the return air valve are:

[0074] The operating frequency P of the ventilation fan is 30Hz, and the opening degree H of the return air valve is 33.33%.

[0075] The operating frequency P of the ventilation fan is 35Hz, and the opening degree H of the return air valve is 38.89%.

[0076] The operating frequency P of the ventilation fan is 40Hz, and the opening degree H of the return air valve is 50.00%.

[0077] The operating frequency P of the ventilation fan is 50Hz, and the opening degree H of the return air valve is 66.67%.

[0078] When the opening degree S of the fresh air valve is 75%, the corresponding operating frequency P of the four sets of ventilation fans and the opening degree H of the return air valve are:

[0079] The operating frequency P of the ventilation fan is 30Hz, and the opening degree H of the return air valve is 33.33%.

[0080] The operating frequency P of the ventilation fan is 35Hz, and the opening degree H of the return air valve is 38.89%.

[0081] The operating frequency P of the ventilation fan is 40Hz, and the opening degree H of the return air valve is 50.00%.

[0082] The operating frequency P of the ventilation fan is 50Hz, and the opening degree H of the return air valve is 66.67%.

[0083] When the opening degree S of the fresh air valve is 100%, the corresponding operating frequency P of the four sets of ventilation fans and the opening degree H of the return air valve are:

[0084] The operating frequency P of the ventilation fan is 30Hz, and the opening degree H of the return air valve is 33.33%.

[0085] The operating frequency P of the ventilation fan is 35Hz, and the opening degree H of the return air valve is 38.89%.

[0086] The operating frequency P of the ventilation fan is 40Hz, and the opening degree H of the return air valve is 50.00%.

[0087] The operating frequency P of the ventilation fan is 50Hz, and the opening degree H of the return air valve is 66.67%.

[0088] In this embodiment, one opening degree S of the fresh air valve corresponds to at least one set of operating frequencies P of the ventilation fans and the opening degree H of the return air valve. This allows for the selection of different ventilation fan operating frequencies and return air valve opening degrees according to different user needs under the same fresh air valve opening degree, making the control of the rail vehicle air conditioning system more accurate and efficient.

[0089] As one embodiment of the invention, the rail vehicle air conditioning system includes an air conditioning system compressor. The air conditioning system compressor plays the role of compressing and driving the refrigerant in the air conditioning refrigerant circuit.

[0090] Specifically, the air conditioning system compressor draws refrigerant from the low-pressure zone, compresses it, and sends it to the high-pressure zone for cooling and condensation. The refrigerant releases heat into the air through the heat exchangers, changing from a gaseous to a liquid state and increasing its pressure. Subsequently, the refrigerant flows from the high-pressure zone to the low-pressure zone, being injected into the evaporator through a capillary tube. The pressure drops sharply, and the liquid refrigerant immediately turns into a gas, absorbing a large amount of heat from the air through the heat exchangers. In this way, the air conditioning system compressor continuously works, constantly absorbing heat from the low-pressure zone into the refrigerant and then releasing it into the air from the high-pressure zone, thus regulating room temperature.

[0091] In this embodiment, the control method for the air conditioning system of the rail vehicle includes:

[0092] Obtain the operating frequency F of the air conditioning system compressor;

[0093] After selecting the opening degree S of the fresh air valve, based on the obtained operating frequency F, select one set of ventilator operating frequency P and return air valve opening degree H from several sets of ventilator operating frequencies P and return air valve opening degrees H corresponding to the opening degree S.

[0094] In this embodiment, the rail vehicle air conditioning system includes one or more compressors. When the air conditioning system includes multiple compressors, the operating frequency F of the air conditioning system compressors is the sum of the operating frequencies of the multiple compressors.

[0095] In this embodiment, based on the operating frequency F of the air conditioning system compressor in the vehicle, the operating frequency P of the ventilation fan and the opening degree H of the return air valve are reasonably selected. That is, after selecting the opening degree S of the fresh air valve, it is not necessary to adjust the opening degree S of the fresh air valve according to the operating frequency F of the air conditioning system compressor. Instead, only the operating frequency P of the ventilation fan and the opening degree H of the return air valve are adjusted to achieve reasonable temperature regulation in the passenger compartment, avoiding frequent adjustment of the fresh air valve and damage to the fresh air valve.

[0096] As one implementation method of this embodiment, the operating frequency P of the control fan and the opening degree H of the return air valve are positively correlated with the obtained operating frequency F of the air conditioning system compressor.

[0097] Specifically, the operating frequencies of the air conditioning system compressor are preset to F1, F2, and F3, where F1 > F2 > F3.

[0098] If the operating frequency F of the air conditioning system compressor is greater than or equal to F1, then the operating frequency P of the control fan should be 50Hz.

[0099] If the operating frequency of the air conditioning system compressor is F2≤F<F1, then the operating frequency of the control fan should be 40Hz≤P<50Hz.

[0100] If the operating frequency of the air conditioning system compressor is F3≤F<F2, then the operating frequency of the control fan is 35Hz≤P<40Hz.

[0101] If the operating frequency F of the air conditioning system compressor is obtained as F < F3, then the operating frequency of the control fan is 30Hz ≤ P < 35Hz.

[0102] In this embodiment, the higher the operating frequency F of the air conditioning system compressor, the higher the operating frequency of the control fan is, so as to ensure higher temperature regulation efficiency and better heat exchange effect, thereby further improving the temperature regulation effect of the rail vehicle air conditioning system.

[0103] As one embodiment of the invention, the control method for a rail vehicle air conditioning system includes:

[0104] Obtain the passenger capacity Q inside the vehicle, and select the opening degree S of the fresh air valve based on the obtained passenger capacity Q.

[0105] Specifically, the opening degree S of the fresh air valve is positively correlated with the obtained passenger capacity Q.

[0106] In this embodiment, the larger the passenger capacity Q, the more passengers are in the carriage. The larger the opening S of the fresh air valve, the better it is for the rail vehicle's air conditioning system to quickly and efficiently adjust the temperature and ventilate the interior of the carriage, thus ensuring the comfort of the carriage.

[0107] As one implementation method of this embodiment, the opening degree S of the fresh air valve is controlled to be 25%-100%. This implementation method allows the opening degree of the fresh air valve to be adjusted within a certain range, ensuring the stability of the rail vehicle's air conditioning system operation.

[0108] In another implementation of this embodiment, passenger capacities Q1, Q2, and Q3 are preset, wherein Q1 < Q2 < Q3.

[0109] If the obtained passenger capacity is 0 < Q < Q1, then the opening degree S of the fresh air valve should be controlled at 25%.

[0110] If the obtained passenger capacity Q1≤Q<Q2, then the opening degree S of the fresh air valve should be controlled to be 25%-50%.

[0111] If the obtained passenger capacity Q2≤Q<Q3, then the opening degree S of the fresh air valve should be controlled to be 50%-75%.

[0112] If the obtained passenger capacity Q≥Q3, then the opening degree S of the fresh air valve should be controlled to be 75%-100%.

[0113] This implementation method reasonably divides the passenger capacity range so that the opening degree of the corresponding fresh air valve can be controlled and selected according to the current passenger capacity range. The selection process is simple and accurate.

[0114] As one embodiment of the present invention, such as Figure 1 As shown, the control methods include:

[0115] S1. Control the start-up of the rail vehicle's air conditioning system;

[0116] S2, preset passenger capacity Q1, Q2, Q3, preset operating frequency of air conditioning system compressor F1, F2, F3, where Q1 < Q2 < Q3, F1 > F2 > F3;

[0117] S3, Obtain the passenger capacity Q in the vehicle;

[0118] S4. Determine whether the obtained passenger capacity 0 < Q < Q1 is true;

[0119] S5. If yes, control the opening degree S of the fresh air valve to 25% and proceed to step S10; if no, proceed to step S6.

[0120] S6. Determine whether the obtained passenger capacity Q1≤Q<Q2 is true;

[0121] S7. If yes, control the opening degree S of the fresh air valve to 50% and proceed to step S10; if no, proceed to step S8.

[0122] S8. Determine whether the obtained passenger capacity Q2≤Q<Q3 is true;

[0123] S9. If yes, control the opening degree S of the fresh air valve to 75% and execute step S10; if no, control the opening degree S of the fresh air valve to 100% and execute step S10.

[0124] S10. Obtain the operating frequency F of the air conditioning system compressor;

[0125] S11. Determine whether the obtained operating frequency F≥F1 of the air conditioning system compressor is true;

[0126] S12. If yes, control the operating frequency of the ventilator P = 50Hz and the opening degree H of the return air valve to 66.67%; if no, proceed to step S13.

[0127] S13. Determine whether the obtained operating frequency of the air conditioning system compressor, F2≤F<F1, is true;

[0128] S14. If yes, control the operating frequency of the ventilator P = 40Hz and the opening degree H of the return air valve to 50.00%; if no, proceed to step S15.

[0129] S15. Determine whether the obtained operating frequency of the air conditioning system compressor, F3≤F<F2, is true;

[0130] S16. If yes, control the operating frequency of the ventilator P = 35Hz and the opening degree H of the return air valve is 38.89%; if no, control the operating frequency of the ventilator P = 30Hz and the opening degree H of the return air valve is 33.33%.

[0131] S17. Determine whether the air conditioning system of the rail vehicle has reached its operating time.

[0132] S18. If yes, end the process; otherwise, repeat steps S3 to S18.

[0133] In this embodiment, the opening degree of the fresh air valve is controlled according to the passenger capacity in the vehicle. After the opening degree of the fresh air valve is selected, the operating frequency of the ventilation fan and the opening degree of the return air valve are controlled according to the operating frequency of the air conditioning system compressor in the vehicle. This ensures that the control of the fresh air valve, return air valve and ventilation fan will not interfere with each other, reducing the redundant design of ventilation volume.

[0134] This invention also provides a rail vehicle air conditioning system controlled by the above-described control method. The rail vehicle air conditioning system controlled by the method of this invention is less prone to malfunctions, ensuring both cooling performance and energy conservation and emission reduction.

[0135] Specifically, a rail vehicle air conditioning system includes:

[0136] The housing has a return air inlet for introducing return air into the carriage, and the return air inlet is equipped with a return air valve.

[0137] The ventilation fan, located inside the casing, is used to deliver the return air introduced through the return air inlet into the carriage.

[0138] A fan frequency modulation module is installed on the fan and is used to adjust the operating frequency of the fan;

[0139] The control module is electrically or communicatively connected to the fan frequency modulation module and the return air valve, and is used to control the opening degree H of the return air valve according to the operating frequency P adjusted by the fan frequency modulation module.

[0140] In this invention, the return air valve is controlled by a control module, so that the return air in the carriage can be processed by the air conditioning system and then transported back into the carriage to complete the circulation, thereby reducing the number of times the fresh air valve operates and lowering the probability of fresh air valve failure.

[0141] The control module controls the opening of the return air valve according to the operating frequency of the fan, so that the operating frequency of the fan and the opening of the return air valve are matched, avoiding the waste of fan energy caused by the fan operating frequency being too high and the opening of the return air valve being too small.

[0142] Specifically, the control module of the present invention includes:

[0143] The first storage unit is used to pre-store the operating frequency P of the ventilator and the opening degree H of the return air valve corresponding to the operating frequency P;

[0144] The first control unit is used to select the corresponding return air valve opening degree H from the first storage unit according to the operating frequency P of the ventilator, and control the opening degree of the return air valve to H.

[0145] In this embodiment, by setting up a first storage unit and a first control unit, the air conditioning system of the rail vehicle can select the opening degree H of the return air valve relatively accurately according to the operating frequency P of the fan during operation, thereby ensuring that the fan is fully utilized and avoiding energy waste by the fan.

[0146] In another embodiment of the present invention, the control module includes a calculation unit, in which a preset calculation model H = f(P) is defined, where f(P) is a monotonically increasing function. The operating frequency P is substituted into the calculation model to calculate the opening degree H of the return air valve.

[0147] In this embodiment, by setting up a computing unit, the opening degree H of the return air valve can be controlled relatively accurately according to the operating frequency P of the ventilator during the operation of the rail vehicle air conditioning system, thereby ensuring that the ventilator is fully utilized and avoiding energy waste.

[0148] As one embodiment of the present invention, the rail vehicle air conditioning system further includes:

[0149] The fresh air inlet is located on the casing and is used to introduce fresh air from outside the vehicle.

[0150] The fresh air valve is installed on the fresh air inlet;

[0151] The control module is electrically or communicatively connected to the fresh air valve, and is used to control the opening degree of the fresh air valve, and according to the opening degree of the fresh air valve, control the fan frequency modulation module to adjust the operating frequency P of the fan and the opening degree H of the return air valve.

[0152] In this embodiment, after selecting the opening degree S of the fresh air valve, the control module then selects the operating frequency P of the ventilation fan and the opening degree H of the return air valve corresponding to the opening degree S, making the entire control process simple and quick, and avoiding redundant control between the fresh air valve and the return air valve.

[0153] As one implementation of this embodiment, the control module further includes:

[0154] The second storage unit is used to store the opening degree of the fresh air valve, the operating frequency P corresponding to the opening degree, and the opening degree H of the return air valve;

[0155] The second control unit is used to select the corresponding operating frequency P of the ventilator and the opening degree H of the return air valve from the second storage unit according to the opening degree of the fresh air valve.

[0156] In this embodiment, by setting a second storage unit and a second control unit, one opening degree S of the fresh air valve corresponds to at least one set of fan operating frequencies P and return air valve opening degrees H. This allows for the selection of different fan operating frequencies and return air valve opening degrees according to different user needs under the same fresh air valve opening degree, making the control of the rail vehicle air conditioning system more accurate and efficient.

[0157] As another implementation of this embodiment, the rail vehicle air conditioning system further includes:

[0158] The passenger capacity acquisition module is used to obtain the passenger capacity Q in the carriage. For example, the passenger capacity acquisition module is a weight sensor, which is set at the bottom of the carriage to obtain the total weight of the passengers in the carriage, and then estimate the passenger capacity Q.

[0159] The control module is electrically and / or communicatively connected to the passenger capacity acquisition module, and is used to control the opening degree of the fresh air valve according to the passenger capacity Q.

[0160] In this embodiment, by setting a passenger capacity acquisition module, the passenger capacity Q inside the vehicle is acquired. Based on the acquired passenger capacity Q, the opening degree S of the fresh air valve is selected, making the control of the opening degree S of the fresh air valve more reasonable.

[0161] As one embodiment of the present invention, the control module further includes:

[0162] The third storage unit is used to preset different passenger capacity ranges and the opening degree of the fresh air valve corresponding to the passenger capacity range;

[0163] The third control unit is used to select the opening degree of the corresponding fresh air valve from the third storage unit based on the acquired passenger volume Q.

[0164] In this embodiment, by setting up a third storage unit and a third control unit, it is convenient to control and select the opening degree of the corresponding fresh air valve according to the current passenger capacity range, and the selection process is simple and accurate.

[0165] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A control method for a rail vehicle air conditioning system, the rail vehicle air conditioning system comprising a housing, a return air inlet for introducing return air from the car body onto the housing, a return air valve on the return air inlet, and a ventilation fan installed inside the housing for delivering the return air introduced through the return air inlet into the car body, characterized in that: During ventilation, the opening degree of the fresh air valve is controlled according to the number of passengers in the vehicle; after the opening degree of the fresh air valve is selected, the operating frequency of the ventilator is controlled according to the operating frequency of the air conditioning system compressor in the vehicle, and the opening degree of the return air valve is controlled according to the operating frequency P of the ventilator. One opening degree of the fresh air valve corresponds to at least one set of operating frequencies of the ventilators and the opening degree of the return air valve. Under the same opening degree of the fresh air valve, different operating frequencies of the ventilators and the opening degree of the return air valve can be selected. Specifically, the steps include the following: The passenger capacity is preset to Q1, Q2, and Q3, where Q1 < Q2 < Q3. The opening range of the fresh air valve is controlled based on the range of the obtained passenger capacity and the preset passenger capacity. The operating frequencies of the air conditioning system compressor are preset to F1, F2, and F3, where F1 > F2 > F3; the operating frequency range of the ventilator and the opening degree of the return air valve are controlled according to the range of the obtained operating frequency of the air conditioning system compressor and the preset operating frequency.

2. The control method for a rail vehicle air conditioning system according to claim 1, characterized in that: The opening degree H of the return air valve is positively correlated with the operating frequency P of the fan.

3. The control method for a rail vehicle air conditioning system according to claim 2, characterized in that: The preset calculation model is H = f(P), where f(P) is a monotonically increasing function. The operating frequency P of the ventilator is substituted into the calculation model to obtain the opening degree H of the return air valve.

4. A control method for a rail vehicle air conditioning system according to any one of claims 1-3, wherein the rail vehicle air conditioning system further includes a fresh air inlet formed on the housing for introducing fresh air from outside the car, and the fresh air inlet is provided with a fresh air valve, characterized in that: After controlling and selecting the opening degree S of the fresh air valve, select the fan operating frequency P corresponding to the opening degree S, and the return air valve opening degree H corresponding to the operating frequency P.

5. The control method for a rail vehicle air conditioning system according to claim 4, characterized in that: One opening degree S of the fresh air valve corresponds to at least one set of operating frequencies P of the ventilation fans and the opening degree H of the return air valve.

6. The control method for a rail vehicle air conditioning system according to claim 5, characterized in that: One opening degree S of the fresh air valve corresponds to the operating frequency P of several sets of ventilation fans, and the opening degree H of the return air valve.

7. The control method for a rail vehicle air conditioning system according to claim 6, wherein the rail vehicle air conditioning system further includes an air conditioning system compressor, characterized in that: Obtain the operating frequency F of the air conditioning system compressor. Based on the obtained operating frequency F, select a set of fan operating frequencies P and return air valve opening degrees H.

8. The control method for a rail vehicle air conditioning system according to claim 7, characterized in that: The operating frequency P of the control fan and the opening degree H of the return air valve are positively correlated with the operating frequency F of the air conditioning system compressor.

9. A control method for a rail vehicle air conditioning system according to any one of claims 5-8, characterized in that: Obtain the passenger capacity Q inside the vehicle, and select the opening degree S of the fresh air valve based on the obtained passenger capacity Q.

10. An air conditioning system for rail vehicles, characterized in that, The control is performed using the control method described in any one of claims 1-9.

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