Air conditioner monitoring system and method for preventing condensation of air outlet grille

Abstract

This invention provides an air conditioning monitoring system and method for preventing condensation on air outlet grilles. The system is based on a non-metallic grille with a low heat transfer coefficient. A first temperature monitoring module is installed at the air outlet grille to acquire the real-time air outlet temperature of the air conditioning system. A second temperature monitoring module is installed inside the vehicle cabin to acquire cabin temperature data to characterize the user's ambient temperature. An air conditioning operation control module integrates the real-time air outlet temperature and the user's ambient temperature data to adjust the operating parameters of the vehicle's air conditioning system to ensure the cooling effect meets the set target comfort requirements. This solution overcomes the problems of incomplete condensation prevention and impact on air conditioning cooling in existing condensation optimization technologies. It comprehensively considers both the air outlet grille material and the air conditioning control strategy, using both air outlet temperature and cabin ambient temperature as comprehensive targets, effectively preventing condensation without affecting the cooling effect of the vehicle's air conditioning.

Description

Technical Field

[0001] This invention relates to the field of public transportation equipment optimization control technology, and in particular to an air conditioning monitoring system and method for preventing condensation on air outlet grilles. Background Technology

[0002] In the air conditioning and ventilation systems of urban rail transit vehicles, to improve the air quality and adjustability of the space, conditioned air is typically blown into the interior space through air outlet grilles. These grilles generally consist of one or more sets of parallel slats, which usually have a certain angle of inclination. Figure 1 As shown, due to the complex shape of the grille, there are certain requirements for its strength and rigidity, especially when used in rail transit vehicles, where vibrations and fluctuations are inevitable. The toughness of the material also needs to meet certain requirements. Currently, aluminum alloy materials are mainly used in rail transit air conditioning systems.

[0003] The heat transfer coefficient of aluminum alloy is 150–200 W / m / K. When the air conditioner outlet temperature is very low, the temperature of the aluminum alloy outlet grille is similar to the outlet temperature due to its high heat transfer coefficient. In the actual operation of urban rail vehicles, frequent door opening and closing are required, especially in cooling mode. When hot, humid air encounters the cooler aluminum alloy outlet grille and then objects that have reached the air dew point (see the air dew point chart below). Figure 2 As shown, condensation will occur on the grille, affecting the lifespan of the air vent grille equipment and interfering with the humidity of the in-vehicle environment, thus impacting the passenger's riding experience.

[0004] While existing technologies attempt to use different materials for the air vent grilles, condensation is still difficult to avoid. In addition, some technical solutions directly control the operation of the air conditioner to keep the indoor temperature above the dew point temperature at all times to avoid condensation. Although this overcomes the condensation problem, the cooling effect of the air conditioner in the vehicle is significantly limited, and it cannot provide passengers with a good body temperature, resulting in more harm than good.

[0005] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] To address the above problems, the present invention provides an air conditioning monitoring system for preventing condensation on the air outlet grille. In one embodiment, the method includes:

[0007] Non-metallic grilles are installed at one or more air outlets of the vehicle's air conditioning system;

[0008] The first temperature monitoring module is set at a predetermined position on the non-metallic grille and is used to obtain the real-time air outlet temperature of the air conditioning system.

[0009] The second temperature monitoring module is set at a designated location in the carriage space to acquire temperature data inside the carriage to characterize the user's ambient temperature.

[0010] The air conditioning operation control module is communicatively connected to the first temperature monitoring module and the second temperature monitoring module. It is configured to integrate the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the operating parameters of the vehicle's air conditioning system so that the cooling effect inside the vehicle meets the set target comfort requirements.

[0011] Preferably, in one embodiment, the air outlet grille has a heat transfer coefficient ≤0.06W / m. 2 ·K is a non-metallic material.

[0012] Furthermore, in one embodiment, the air conditioning operation control module is configured to calculate the difference between the user's ambient temperature and the preset target ambient temperature as a control index, and to control the operating parameters of the vehicle's air conditioning system based on the control index value and the set control level value.

[0013] In one optional embodiment, the air conditioning operation control module adjusts the compressor operating frequency and fan operating air volume of the vehicle air conditioning system based on the comparison result between the control index value and the set control level value, combined with the constraint control conditions of the air conditioning outlet temperature.

[0014] Specifically, in one optional embodiment, the constraint control condition for the air conditioner outlet temperature is set as follows: the outlet temperature of the air conditioning system is more than 1 degree higher than the rated outlet temperature under cooling conditions.

[0015] In practical applications, in one embodiment, when the control index is ≥3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0016] The compressor operating frequency is set to the first-level frequency, and the fan operating air volume is set to the first-level air volume, which is the rated operating air volume of the fan.

[0017] Furthermore, in one embodiment, when 1℃ ≤ control index < 3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0018] Set the compressor operating frequency to the second-level frequency and the fan operating air volume to the second-level air volume;

[0019] After a set interval, determine whether the outlet temperature meets the set constraint control conditions. If yes, keep the air conditioner running according to the current operating parameters; otherwise, adjust the compressor operating frequency to the third level frequency, while the fan operating air volume remains at the second level air volume.

[0020] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, while the fan operating air volume remains at the second level air volume.

[0021] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to use the fourth level frequency and the fan operating air volume is controlled to use the first level air volume.

[0022] On the other hand, in one embodiment, when -1℃ ≤ control index < 1℃, the air conditioning operation control module is configured to control the operating parameters of the vehicle air conditioning system according to the following logic:

[0023] Set the compressor operating frequency to the fourth level frequency and the fan operating air volume to the third level air volume;

[0024] After a set interval, determine whether the outlet temperature meets the set constraint control conditions. If yes, keep the air conditioner running according to the current operating parameters; otherwise, adjust the compressor operating frequency to the fourth level frequency and increase the fan operating air volume to the second level air volume.

[0025] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to the fourth level frequency, and the fan operating air volume is increased to the first level air volume.

[0026] Based on the application aspects of the system described in any one or more of the above embodiments, the present invention also provides an air conditioning monitoring method for preventing condensation on the air outlet grille, the method comprising:

[0027] Temperature monitoring setup steps: A first temperature monitoring module is set at a set position on the non-metallic grille, and a second temperature monitoring module is set at a set position in the passenger compartment, which are used to obtain real-time air outlet temperature data of the air conditioning system and user ambient temperature data, respectively.

[0028] The air conditioning operation control procedure involves the air conditioning operation control module integrating the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the vehicle's air conditioning system operating parameters so that the cooling effect inside the vehicle meets the set target comfort requirements.

[0029] Preferably, in one embodiment, during the air conditioning operation control step, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following strategy:

[0030] The difference between the user's ambient temperature and the preset target ambient temperature is calculated as a control index. Based on the comparison between the value of the control index and the set control level, the operating parameters of the vehicle's air conditioning system are adjusted in combination with the constraint control conditions of the air conditioning outlet temperature.

[0031] Compared with the closest prior art, the present invention also has the following beneficial effects:

[0032] This invention provides an air conditioning monitoring system and method for preventing condensation on air outlet grilles. The system is based on a non-metallic grille with a low heat transfer coefficient to acquire real-time air outlet temperature and cabin temperature data of the air conditioning system. By using the air conditioning operation control module to integrate the real-time air outlet temperature and the user's ambient temperature, the system adjusts the operating parameters of the vehicle's air conditioning system to ensure that the cooling effect inside the vehicle meets the set target comfort requirements. The system proposes an anti-condensation strategy that combines the use of non-metallic air outlet grilles and the control of air outlet temperature. With the air outlet temperature and the cabin ambient temperature as the comprehensive target, it ensures that frequent door opening and closing will not cause condensation on the air outlet grilles, while also not affecting the cooling effect of the air conditioning inside the vehicle.

[0033] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is an example diagram of the shape of the air outlet grille used in the field provided by this invention;

[0036] Figure 2 This is an example of an air temperature, humidity, and dew point comparison chart provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of an air conditioning monitoring system for preventing condensation on the air outlet grille, provided in an embodiment of the present invention. Detailed Implementation

[0038] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. Those skilled in the art will then fully understand how the present invention uses technical means to solve technical problems and achieve technical effects, and will be able to implement the present invention specifically based on the above-described implementation process. It should be noted that, as long as there is no conflict, the various embodiments and features of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0039] Although the flowchart describes the operations as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. The order of the operations can be rearranged. A process can terminate when its operation is complete, but it may also have additional steps not included in the diagram. A process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0040] This invention can achieve the desired technical effects using computer equipment, which includes user equipment and network equipment. User equipment or clients include, but are not limited to, computers, smartphones, and PDAs; network equipment includes, but is not limited to, a single network server, a server group consisting of multiple network servers, or a cloud based on cloud computing consisting of a large number of computers or network servers. The computer equipment can operate independently to implement this invention, or it can connect to a network and implement this invention through interactive operation with other computer devices in the network. The network in which the computer equipment is located includes, but is not limited to, the Internet, wide area networks (WANs), metropolitan area networks (MANs), local area networks (LANs), and VPN networks.

[0041] The terms “first,” “second,” etc., may be used herein to describe various units, but these units should not be limited by these terms; they are used merely to distinguish one unit from another. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. When a unit is referred to as “connected” or “coupled” to another unit, it may be directly connected or coupled to said other unit, or there may be intermediate units present.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms “a” and “an” as used herein are also intended to include the plural. It should also be understood that the terms “comprising” and / or “including” as used herein specify the presence of the stated features, integers, steps, operations, units, and / or components, without excluding the presence or addition of one or more other features, integers, steps, operations, units, components, and / or combinations thereof.

[0043] In the air conditioning and ventilation systems of urban rail transit vehicles, the air outlet grilles are generally composed of one or more sets of parallel bars. The bars usually have a certain tilt angle, typically 45° to 80°. Due to the complex shape of the grilles, and the certain requirements for their strength and rigidity, especially when used in rail transit vehicles, vibrations and fluctuations are inevitable. The toughness of the material also needs to meet certain requirements. Currently, aluminum alloy materials are mainly used in rail transit air conditioning systems. The heat transfer coefficient of aluminum alloy is 150 to 200 W m / K. When the air outlet temperature is very low, the air outlet grilles made of aluminum alloy have a high heat transfer coefficient, so their own temperature is similar to the outlet temperature.

[0044] In the actual operation of urban rail vehicles, doors need to be opened and closed frequently, especially in cooling mode. When hot and humid air encounters the cooler aluminum alloy air outlet grille and then objects that have reached the air dew point, an air dew point reference table is provided. Figure 1 As shown, condensation will occur on the grille, affecting the lifespan of the air vent grille equipment and interfering with the humidity of the vehicle interior, thus impacting the passenger experience. For example, at an ambient temperature of 32℃ (dry bulb temperature) and a relative humidity of 95%, the dew point is 31.2℃. This means that air at this temperature and relative humidity will condense when it encounters an aluminum alloy air vent grille at 31.2℃.

[0045] While existing technologies attempt to use different materials for the air vent grilles, condensation is still difficult to avoid. In addition, some technical solutions directly control the operation of the air conditioner to keep the indoor temperature above the dew point temperature at all times to avoid condensation. Although this overcomes the condensation problem, the cooling effect of the air conditioner in the vehicle is significantly limited, and it cannot provide passengers with a good body temperature, resulting in more harm than good.

[0046] For example, the paper "An Air Exhaust Grille for Rail Transit Vehicles and Its Manufacturing Method" proposes using materials with a heat transfer coefficient of less than 1 W / mK to manufacture the air exhaust grille. While this reduces the likelihood of condensation to some extent, condensation will still occur at the air exhaust grille when the set scenario reaches the air dew point temperature. The paper "An Anti-Condensation Control Method, Device, and Air Conditioning Equipment" proposes controlling the air conditioner outlet temperature to be no lower than the air dew point temperature to solve the condensation problem. This control strategy can avoid condensation, but it will seriously affect passenger comfort, such as... Figure 2 When the ambient temperature is 32℃ and the relative humidity is 95%, the dew point temperature is 31.2℃. Therefore, the air conditioner's outlet temperature needs to be controlled to be no lower than 31.2℃, otherwise the air conditioner's cooling effect will be extremely poor. In "An Air Conditioning Control Method and System for Rail Vehicles", the highest priority control target is to achieve the target temperature inside the vehicle (set temperature inside the vehicle) to ensure the cooling effect of the air conditioner as soon as possible. However, this control strategy will result in a low air conditioner outlet temperature, which is prone to condensation on the outlet grille.

[0047] To address the aforementioned issues, this invention provides an air conditioning monitoring system and method for preventing condensation on air outlet grilles. It comprehensively considers both the air outlet grille material and the air conditioning control strategy, prioritizing the control of the outlet air temperature by controlling the frequency of the air conditioning compressor and the airflow of the fan. The target interior temperature is then prioritized. This air conditioning control strategy overcomes the problems of incomplete condensation prevention and impaired air conditioning cooling in existing condensation optimization technologies, effectively preventing condensation while ensuring good indoor cooling performance.

[0048] The structural components, connection methods, and functional principles of the system according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Although the logical order of each operation is shown in the description of the system's structural operation, in some cases, the operations shown or described may be performed in a different order than that shown here.

[0049] Example 1

[0050] Figure 3 This diagram illustrates the structure of an air conditioning monitoring system for preventing condensation on the air outlet grille, as provided in Embodiment 1 of the present invention. (Refer to...) Figure 3 It can be seen that the system includes:

[0051] Non-metallic grilles are installed at one or more air outlets of the vehicle's air conditioning system;

[0052] The first temperature monitoring module is set at a predetermined position on the non-metallic grille and is used to obtain the real-time air outlet temperature of the air conditioning system.

[0053] The second temperature monitoring module is set at a designated location in the carriage space to acquire temperature data inside the carriage to characterize the user's ambient temperature.

[0054] The air conditioning operation control module is communicatively connected to the first temperature monitoring module and the second temperature monitoring module. It is configured to integrate the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the operating parameters of the vehicle's air conditioning system so that the cooling effect inside the vehicle meets the set target comfort requirements.

[0055] This invention takes into account the frequent opening and closing of doors in urban public rail transit vehicles. It comprehensively considers both the material of the air outlet grille and the air conditioning control strategy, ensuring that frequent door opening and closing will not cause condensation on the air outlet grille, and will not affect the cooling effect of the air conditioning in the vehicle.

[0056] Preferably, in one embodiment, the air outlet grille has a heat transfer coefficient ≤0.06W / m. 2 ·K is a non-metallic material.

[0057] Furthermore, considering that the air vent grille is relatively long, and that the air conditioner will heat the vehicle in winter, and that the vehicle will continuously vibrate, the material properties of the grille itself need to be non-deformable and tough under these conditions. In practical applications, epoxy resin materials, etc., can be used.

[0058] In an optional embodiment, the air conditioning operation control module is configured to calculate the difference between the user's ambient temperature and a preset target ambient temperature as a control index, and adjust the operating parameters of the vehicle's air conditioning system based on the comparison result between the control index value and the set control level value.

[0059] In one embodiment, the air conditioning operation control module adjusts the compressor operating frequency and fan operating air volume of the vehicle air conditioning system based on the comparison result between the value of the control index and the set control level value, combined with the constraint control condition of the air conditioning outlet temperature.

[0060] When designing an air conditioner, the outlet air temperature (T), supply air volume (V), and cooling capacity are all fixed under rated operating conditions. For practical reference, see GB / T 37123 Automotive Electric Air Conditioners; Rated cooling conditions (nominal cooling conditions): Dry bulb temperature of air at the vehicle's interior inlet is 27℃, and wet bulb temperature is 19.5℃; Dry bulb temperature of air at the vehicle's exterior inlet is 35℃.

[0061] When controlling the air outlet temperature of an air conditioner, the air outlet temperature t of the air conditioner cannot be lower than the air outlet temperature T+1℃ under rated operating conditions, that is, t≥T+1℃. Based on this, in a preferred embodiment, the constraint control condition for the air outlet temperature of the air conditioner is set as follows: the air outlet temperature of the air conditioning system is more than 1 degree higher than the rated air outlet temperature under cooling conditions.

[0062] In an optional embodiment, when the control index is ≥3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0063] The compressor operating frequency is set to the first-level frequency, and the fan operating air volume is set to the first-level air volume, which is the rated operating air volume of the fan.

[0064] In one embodiment, the difference between the user's ambient temperature and a preset target ambient temperature is calculated as a control index, namely Ti-Tic. For rail transit vehicles, Ti represents the interior temperature, and Tic represents the target interior temperature. In practical applications, the interior temperature can be the average temperature data within a set range inside the vehicle. The average temperature is calculated using temperature data from a set height interval, optionally using temperature data at 1.1m. Generally, when designing an air conditioning system, multiple temperature monitoring points are set inside the vehicle. The weighted average of the monitored temperatures is used as a sub-object to calculate the average value as the interior temperature. The weighted average value is basically the same as the interior temperature. The weighting coefficients of each monitored temperature value are set to different values ​​depending on the location.

[0065] In practical applications, considering the operating conditions of the onboard air conditioning in public transportation vehicles, taking a compressor operating frequency range of 30-70Hz as an example, when Ti-Tic ≥ 3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0066] 1) Set the compressor operating frequency to the first-level frequency; Optionally, the compressor operating frequency is determined by the compressor speed, so the compressor operating frequency can be represented by the compressor speed. The compressor operating frequency is represented by a set ratio of the rated operating condition compressor speed value according to the requirements. For example, the first-level frequency can be the frequency corresponding to the rated operating condition compressor speed design value n, such as the frequency corresponding to the rated operating condition compressor speed is 70Hz.

[0067] 2) The fan operating air volume adopts the first-level air volume, which can be the rated operating air volume of the fan, i.e., V m. 3 / h.

[0068] When the air conditioner is operating at its rated temperature, the outlet air temperature is T, so the outlet air temperature will not be lower than T+1℃. At this time, the air conditioner can operate at its maximum capacity to meet the cooling requirements; at the same time, it can control the outlet air temperature to prevent condensation.

[0069] Furthermore, in one embodiment, when 1℃ ≤ control index < 3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0070] Set the compressor operating frequency to the second-level frequency and the fan operating air volume to the second-level air volume;

[0071] After a set time, it determines whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner continues to operate according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the third level frequency, while the fan operating air volume remains at the second level air volume.

[0072] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, while the fan operating air volume remains at the second level air volume.

[0073] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to use the fourth level frequency and the fan operating air volume is controlled to use the first level air volume.

[0074] In practical applications, when 1℃≤Ti-Tic<3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0075] 3) Set the compressor operating frequency to the second-level frequency; the second-level frequency can be selected from 50 to 60 Hz.

[0076] 4) Set the fan operating airflow to the second-level airflow; the second-level airflow can be 2 / 3 of the rated airflow, i.e., 2 / 3V m 3 / h;

[0077] After a set interval Δt, it is determined whether the air outlet temperature meets the set constraint control conditions. For example, the air outlet temperature can be detected after 2 minutes to determine whether the air outlet temperature meets the set constraint control conditions. The length of the interval can be flexibly selected by the staff according to the needs, and the specific value is not particularly limited.

[0078] a) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters and operate the air conditioner according to strategies 3) and 4) above;

[0079] b) If the outlet temperature t < T+1℃, then:

[0080] 5) Adjust the compressor operating frequency to the third level frequency, which can be selected from 40 to 50 Hz.

[0081] 6) The fan operating airflow is still set to the second level airflow, that is, the airflow is still 2 / 3V m. 3 / h:

[0082] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. Usually, the set time intervals are consistent.

[0083] c) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters and operate the air conditioner according to strategies 5) and 6) above;

[0084] d) If the outlet temperature t < T+1℃, then:

[0085] 7) Adjust the compressor operating frequency to the fourth level frequency, which can be selected from 30 to 40 Hz.

[0086] 8) Set the fan operating airflow to the second level, i.e., the airflow remains 2 / 3V m. 3 / h;

[0087] After setting a time, it is further determined whether the outlet temperature meets the set constraint control conditions.

[0088] e) If the outlet air temperature t≥T+1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to the strategies in 7) and 8) above;

[0089] f) If the outlet air temperature t < T+1℃, then:

[0090] 9) The compressor operating frequency is controlled using the fourth-level frequency. In practical applications, the value of the fourth-level frequency can be selected from 30 to 40 Hz.

[0091] 10) The fan operates at the first-level air volume, i.e., the air volume is increased to V m. 3 / h.

[0092] Furthermore, in one embodiment, when -1℃ ≤ control index < 1℃, the air conditioning operation control module is configured to control the operating parameters of the vehicle air conditioning system according to the following logic:

[0093] Set the compressor operating frequency to the fourth level frequency and the fan operating air volume to the third level air volume;

[0094] After a set time, it determines whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner continues to operate according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, and the fan operating air volume is increased to the second level air volume.

[0095] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to the fourth level frequency, and the fan operating air volume is increased to the first level air volume.

[0096] In practical applications, when -1℃ ≤ Ti-Tic < 1℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0097] 11) Set the compressor operating frequency to the fourth level frequency. The value of the fourth level frequency can be selected between 30 and 40 Hz.

[0098] 12) Set the fan operating airflow to the third level airflow, where the third level airflow can be 1 / 2V m. 3 / h;

[0099] It then determines whether the outlet air temperature meets the set constraint control conditions after a set time, for example, detecting the air conditioner outlet air temperature after 2 minutes.

[0100] g) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to strategies 11) and 12) above;

[0101] h) If the outlet temperature t < T+1℃, then:

[0102] 13) Adjust the compressor operating frequency to the fourth level frequency. The value of the fourth level frequency can be selected between 30 and 40 Hz.

[0103] 14) Set the fan operating airflow to the second level, i.e., set the airflow to 2 / 3V m. 3 / h;

[0104] After setting a time, it is further determined whether the outlet temperature meets the set constraint control conditions.

[0105] i) If the outlet air temperature t≥T+1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to strategies 13) and 14) above;

[0106] j) If the outlet temperature t < T+1℃, then:

[0107] 15) The compressor operating frequency is controlled using the fourth-level frequency, and the value of the fourth-level frequency can be selected between 30 and 40 Hz;

[0108] 16) Set the fan operating airflow to the first level airflow, i.e., increase the airflow to V m. 3 / h.

[0109] Furthermore, considering the convenience and accuracy of retrieving the compressor's operating frequency, technicians can pre-test the compressor's operating frequency at different temperatures based on the vehicle's air conditioning system under different operating conditions and temperature control effects. A frequency change curve can be plotted based on the associated data. In practical applications, the horizontal axis can be set to reflect judgment conditions (such as whether the set temperature has been reached, how far away from the set temperature, etc.). The closer to the set temperature, the lower the compressor's operating frequency. Using this method, the frequency change curve can be continuously retrieved after a single acquisition, eliminating the need for repeated testing and controlling the probability of frequency retrieval errors, thus improving reliability.

[0110] The air conditioning monitoring system employing the present invention, which prevents condensation on the air outlet grille, implements an anti-condensation strategy that combines two measures: non-metallic air outlet grilles and control of the air outlet temperature. During the control of air conditioning operating parameters, controlling the air outlet temperature is the highest priority, achieved by controlling the frequency of the air conditioning compressor and the airflow of the fan; the target temperature inside the vehicle is the second highest priority. This air conditioning control strategy ensures effective indoor cooling.

[0111] In the air conditioning monitoring system for preventing condensation on the air outlet grille provided in this embodiment of the invention, each module or unit structure can operate independently or in combination according to material preparation requirements or actual control requirements to achieve the corresponding technical effects.

[0112] Example 2

[0113] The above-described embodiments of the present invention have provided a detailed description of the system. Based on other aspects of the system described in any one or more of the above embodiments, the present invention also provides an air conditioning monitoring method for preventing condensation on air outlet grilles. This method is applied to the air conditioning monitoring system for preventing condensation on air outlet grilles described in any one or more of the above embodiments. Specific embodiments are given below for detailed description.

[0114] Specifically, the following describes the operating principle of the air conditioning monitoring method for preventing condensation on the air outlet grille provided in the embodiments of the present invention. The method includes the following steps:

[0115] Temperature monitoring setup steps: A first temperature monitoring module is set at a set position on the non-metallic grille, and a second temperature monitoring module is set at a set position in the passenger compartment, which are used to obtain real-time air outlet temperature data of the air conditioning system and user ambient temperature data, respectively.

[0116] The air conditioning operation control procedure involves the air conditioning operation control module integrating the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the vehicle's air conditioning system operating parameters so that the cooling effect inside the vehicle meets the set target comfort requirements.

[0117] Preferably, in one embodiment, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following strategy:

[0118] The difference between the user's ambient temperature and the preset target ambient temperature is calculated as a control index. Based on the comparison between the value of the control index and the set control level, the operating parameters of the vehicle's air conditioning system are adjusted in combination with the constraint control conditions of the air conditioning outlet temperature.

[0119] Non-metallic grilles are installed at one or more air outlets of the vehicle's air conditioning system.

[0120] The first temperature monitoring module is set at a predetermined position on the non-metallic grille to obtain the real-time air outlet temperature of the air conditioning system.

[0121] The second temperature monitoring module is set at a designated location in the carriage space to acquire temperature data inside the carriage in order to characterize the user's ambient temperature.

[0122] The air conditioning operation control module is communicatively connected to the first temperature monitoring module and the second temperature monitoring module. It is configured to integrate the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the operating parameters of the vehicle's air conditioning system so that the cooling effect inside the vehicle meets the set target comfort requirements.

[0123] In practical applications, considering the relatively long length of the air vent grille, the heating function of the air conditioner in winter, and the continuous vibration of the vehicle, the material properties of the grille itself must not deform under these conditions. Therefore, the air vent grille can be made of non-metallic materials with a heat transfer coefficient ≤0.06W / m2·K, such as epoxy resin.

[0124] Furthermore, in one embodiment, the constraint control condition for the air conditioner outlet temperature is set as follows: the air conditioner outlet temperature is more than 1 degree higher than the rated outlet temperature under cooling conditions.

[0125] Optionally, in one embodiment, the air conditioning operation control module adjusts the compressor operating frequency and fan operating air volume of the vehicle air conditioning system based on the comparison result between the control index value and the set control level value.

[0126] In practical applications, in one embodiment, when the control index is ≥3℃, during the air conditioning operation control process, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following logic:

[0127] The compressor operating frequency is set to the first-level frequency, and the fan operating air volume is set to the first-level air volume, which is the rated operating air volume of the fan.

[0128] Furthermore, in one embodiment, when 1℃ ≤ control index < 3℃, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following logic:

[0129] Set the compressor operating frequency to the second-level frequency and the fan operating air volume to the second-level air volume;

[0130] After a set interval, determine whether the outlet temperature meets the set constraint control conditions. If yes, keep the air conditioner running according to the current operating parameters; otherwise, adjust the compressor operating frequency to the third level frequency, while the fan operating air volume remains at the second level air volume.

[0131] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, while the fan operating air volume remains at the second level air volume.

[0132] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to use the fourth level frequency and the fan operating air volume is controlled to use the first level air volume.

[0133] On the other hand, in one embodiment, when -1℃ ≤ control index < 1℃, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following logic:

[0134] Set the compressor operating frequency to the fourth level frequency and the fan operating air volume to the third level air volume;

[0135] After a set time, it determines whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner continues to operate according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, and the fan operating air volume is increased to the second level air volume.

[0136] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to the fourth level frequency, and the fan operating air volume is increased to the first level air volume.

[0137] In practical applications, when Ti-Tic ≥ 3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0138] 1) Set the compressor operating frequency to the first-level frequency; optionally, the first-level frequency can be the frequency corresponding to the compressor speed n, and 70Hz can be selected in actual application;

[0139] 2) The fan operating air volume adopts the first-level air volume, which can be the rated operating air volume of the fan, i.e., V m. 3 / h.

[0140] When the air conditioner is operating at its rated temperature, the outlet air temperature is T, so the outlet air temperature will not be lower than T+1℃. At this time, the air conditioner can operate at its maximum capacity to meet the cooling requirements; at the same time, it can control the outlet air temperature to prevent condensation.

[0141] When 1℃≤Ti-Tic<3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0142] 3) Set the compressor operating frequency to the second-level frequency; the second-level frequency is between 50 and 60 Hz, and can be selected from the middle.

[0143] 4) Set the fan operating airflow to the second-level airflow; the second-level airflow can be 2 / 3 of the rated airflow, i.e., 2 / 3V m 3 / h;

[0144] And after a set time, it is determined whether the air outlet temperature meets the set constraint control conditions. For example, the air outlet temperature can be detected after 2 minutes to determine whether the air outlet temperature meets the set constraint control conditions.

[0145] a) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters and operate the air conditioner according to strategies 3) and 4) above;

[0146] b) If the outlet temperature t < T+1℃, then:

[0147] 5) Adjust the compressor operating frequency to the third level frequency, which is between 40 and 50 Hz and can be selected from the middle.

[0148] 6) The fan operating airflow is still set to the second level airflow, that is, the airflow is still 2 / 3V m. 3 / h:

[0149] After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. Usually, the set time intervals are consistent.

[0150] c) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters and operate the air conditioner according to strategies 5) and 6) above;

[0151] d) If the outlet temperature t < T+1℃, then:

[0152] 7) Adjust the compressor operating frequency to the fourth level frequency, which is between 30 and 40 Hz and can be selected from the middle.

[0153] 8) Set the fan operating airflow to the second level, i.e., the airflow remains 2 / 3V m. 3 / h;

[0154] After setting a time, it is further determined whether the outlet temperature meets the set constraint control conditions.

[0155] e) If the outlet air temperature t≥T+1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to the strategies in 7) and 8) above;

[0156] f) If the outlet air temperature t < T+1℃, then:

[0157] 9) The compressor operating frequency is controlled using the fourth-level frequency, which is between 30 and 40 Hz and can be selected from the middle.

[0158] 10) The fan operates at the first-level air volume, i.e., the air volume is increased to V m. 3 / h.

[0159] In practical applications, when -1℃ ≤ Ti-Tic < 1℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic:

[0160] 11) Set the compressor operating frequency to the fourth level frequency, which is between 30 and 40 Hz and can be selected from the middle.

[0161] 12) Set the fan operating airflow to the third level airflow, where the third level airflow can be 1 / 2V m. 3 / h;

[0162] It then determines whether the outlet air temperature meets the set constraint control conditions after a set time, for example, detecting the air conditioner outlet air temperature after 2 minutes.

[0163] g) If the outlet temperature t ≥ T + 1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to strategies 11) and 12) above;

[0164] h) If the outlet temperature t < T+1℃, then:

[0165] 13) Adjust the compressor operating frequency to the fourth level frequency, which is between 30 and 40 Hz and can be selected from the middle.

[0166] 14) Set the fan operating airflow to the second level, i.e., set the airflow to 2 / 3V m. 3 / h;

[0167] After setting a time, it is further determined whether the outlet temperature meets the set constraint control conditions.

[0168] i) If the outlet air temperature t≥T+1℃, then keep the air conditioner running according to the current operating parameters, that is, run the air conditioner according to strategies 13) and 14) above;

[0169] j) If the outlet temperature t < T+1℃, then:

[0170] 15) The compressor operating frequency is controlled using the fourth-level frequency, which is between 30 and 40 Hz and can be selected from the middle.

[0171] 16) Set the fan operating airflow to the first level airflow, i.e., increase the airflow to V m.3 / h.

[0172] For ease of understanding, in an optional embodiment under actual cooling mode, the air conditioner operation parameter control strategy can be simplified as follows:

[0173] When Ti-Tic ≥ 3℃, the air conditioner's operating strategy is as follows:

[0174] 1) The compressor operating frequency is the frequency corresponding to the compressor speed n;

[0175] 2) The operating air volume of the fan is the air volume under rated operating conditions, i.e., V m 3 / h.

[0176] When the air conditioner is operating under rated conditions, the rated outlet air temperature is T, and the outlet air temperature t is controlled to be no lower than T+1℃. At this time, the air conditioner can exert its maximum capacity to meet the cooling requirements, while also controlling the outlet air temperature to prevent condensation.

[0177] When 1℃≤Ti-Tic<3℃, the air conditioner's operating strategy is as follows:

[0178] 3) The compressor operating frequency adopts the second-level frequency, such as 55Hz when the compressor speed is 2 / 3n;

[0179] 4) The operating air volume of the fan is 2 / 3 of the rated air volume, i.e., 2 / 3V m 3 / h;

[0180] After 2 minutes, the air conditioner outlet temperature is checked, and the compressor frequency and fan volume are controlled with the air conditioner outlet temperature as the highest priority.

[0181] a) If the outlet temperature t ≥ T + 1℃, then the air conditioner shall be operated according to the above strategies ((1) and (2));

[0182] b) If the outlet temperature t < T+1℃, then:

[0183] 5) The compressor operating frequency is reduced to the third-level frequency, such as the frequency of 40Hz corresponding to a compressor speed of 1 / 2n;

[0184] 6) The air volume remains at 2 / 3V m 3 / h; 2 minutes later:

[0185] c) If the outlet air temperature t ≥ T + 1℃, then operate the air conditioner according to strategies 5) and 6) above;

[0186] d) If the outlet temperature t < T+1℃, then:

[0187] 7) The compressor operating frequency is reduced to the fourth level frequency, such as the frequency of 30Hz corresponding to the compressor speed of 1 / 3n;

[0188] 8) The air volume remains at 2 / 3V m 3 / h; 2 minutes later:

[0189] e) If the outlet air temperature t ≥ T + 1℃, then operate the air conditioner according to strategies 7) and 8) above;

[0190] f) If the outlet air temperature t < T+1℃, then:

[0191] 9) The compressor operating frequency adopts the fourth level frequency, such as the frequency of 30Hz corresponding to the compressor speed of 1 / 3n;

[0192] 10) Air volume increases to V m 3 / h.

[0193] On the other hand, when -1℃≤Ti-Tic<1℃, the air conditioner's operating strategy is as follows:

[0194] 11) The compressor operating frequency adopts the fourth level frequency, such as the frequency of 30Hz corresponding to the compressor speed of 1 / 3n;

[0195] 12) The fan's operating air volume is 1 / 2V m 3 / h;

[0196] After 2 minutes, the air conditioner outlet temperature is checked, and the compressor frequency and fan volume are controlled with the air conditioner outlet temperature as the highest priority.

[0197] g) If the outlet temperature t ≥ T + 1℃, then the air conditioner shall be operated according to strategies 11) and 12) above;

[0198] h) If the outlet temperature t < T+1℃, then:

[0199] 13) The compressor operating frequency still uses the fourth-level frequency, such as 30Hz, which corresponds to a compressor speed of 1 / 3n.

[0200] 14) Air volume increases to 2 / 3V m 3 / h; 2 minutes later:

[0201] i) If the outlet air temperature t ≥ T + 1℃, then the air conditioner shall be operated according to strategies 13) and 14) above;

[0202] j) If the outlet temperature t < T+1℃, then:

[0203] 15) The compressor operating frequency adopts the fourth level frequency, such as the frequency of 30Hz corresponding to the compressor speed of 1 / 3n;

[0204] 16) Air volume increases to V m 3 / h.

[0205] The method of this invention prioritizes controlling the air outlet temperature, which is achieved by controlling the frequency of the air conditioning compressor and the air volume of the fan. The target temperature inside the vehicle is the second priority control level. This air conditioning control strategy can ensure the indoor cooling effect, that is, it ensures that frequent opening and closing of doors will not cause condensation on the air outlet grille, and it will not affect the cooling effect of the air conditioning inside the vehicle.

[0206] The above description discloses only specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or modifications that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention, as follows:

[0207] 1) This method, to avoid affecting the air conditioning cooling effect, uses the air outlet temperature of the air conditioner under rated cooling conditions as a basis to set the required air outlet temperature value. If the air outlet temperature value is determined by other methods, it should also be within the scope of protection of this patent.

[0208] 2) This patent describes in detail how to control the outlet air temperature to not be lower than the set value by controlling the compressor frequency converter and air volume. If the same control measures (air volume, frequency) are adopted, they should also be within the scope of protection of this patent.

[0209] Furthermore, for the sake of simplicity, the aforementioned method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0210] It should be noted that, in other embodiments of the present invention, the method can also be combined with one or more of the above embodiments to obtain a new air conditioning monitoring method for preventing condensation on the air outlet grille, so as to achieve optimized control of the air conditioning and ventilation system of rail transit vehicles.

[0211] It should be noted that, based on the methods in any one or more embodiments of the present invention described above, the present invention also provides a storage medium storing program code that can implement the methods described in any one or more embodiments. When the program code is executed by the operating system, it can implement the air conditioning monitoring method for preventing condensation on the air outlet grille as described above.

[0212] The phrase "an embodiment" in the specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0213] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. An air conditioning monitoring system for preventing condensation on air outlet grilles, characterized in that, The system includes: Non-metallic grilles are installed at one or more air outlets of the vehicle's air conditioning system; The first temperature monitoring module is set at a predetermined position on the non-metallic grille and is used to obtain the real-time air outlet temperature of the air conditioning system. The second temperature monitoring module is set at a designated location in the carriage space to acquire temperature data inside the carriage to characterize the user's ambient temperature. The air conditioning operation control module is communicatively connected to the first temperature monitoring module and the second temperature monitoring module. It is configured to integrate real-time air conditioning outlet temperature and user ambient temperature data to adjust the operating parameters of the vehicle air conditioning system so that the cooling effect inside the vehicle meets the set target comfort requirements. The air conditioning operation control module is configured to calculate the difference between the user's ambient temperature and the preset target ambient temperature as a control index, and adjust the operating parameters of the vehicle's air conditioning system based on the control index value and the set control level value. The air conditioning operation control module adjusts the compressor operating frequency and fan operating air volume of the vehicle air conditioning system based on the comparison result between the control index value and the set control level value, combined with the constraint control condition of the air conditioning outlet temperature. When the control index is ≥3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic: The compressor operating frequency and the fan operating air volume are initially set to the first level frequency and the first level air volume, which is the rated operating air volume of the fan. When 1℃ ≤ control target < 3℃, the air conditioning operation control module is configured to adjust the operating parameters of the vehicle air conditioning system according to the following logic: Set the compressor operating frequency to the second-level frequency and the fan operating air volume to the second-level air volume; After a set interval, determine whether the outlet temperature meets the set constraint control conditions. If yes, keep the air conditioner running according to the current operating parameters; otherwise, adjust the compressor operating frequency to the third level frequency, while the fan operating air volume remains at the second level air volume. After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is adjusted to the fourth level frequency, while the fan operating air volume remains at the second level air volume. After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to use the fourth level frequency and the fan operating air volume is controlled to use the first level air volume.

2. The system according to claim 1, characterized in that, The air outlet grille has a heat transfer coefficient of ≤0.06W / m. 2 ·K is a non-metallic material.

3. The system according to claim 1, characterized in that, The constraint control condition for the air conditioner outlet temperature is set as follows: the outlet temperature of the air conditioning system is more than 1 degree higher than the rated outlet temperature under cooling conditions.

4. The system according to claim 1, characterized in that, When -1℃ ≤ control index < 1℃, the air conditioning operation control module is configured to control the operating parameters of the vehicle air conditioning system according to the following logic: Set the compressor operating frequency to the fourth level frequency and the fan operating air volume to the third level air volume; After a set interval, determine whether the outlet temperature meets the set constraint control conditions. If yes, keep the air conditioner running according to the current operating parameters; otherwise, adjust the compressor operating frequency to the fourth level frequency and increase the fan operating air volume to the second level air volume. After setting the time, it is further determined whether the outlet temperature meets the set constraint control conditions. If so, the air conditioner is kept running according to the current operating parameters; otherwise, the compressor operating frequency is controlled to the fourth level frequency, and the fan operating air volume is increased to the first level air volume.

5. A method for monitoring air conditioning systems to prevent condensation on air outlet grilles, characterized in that, The method is implemented based on the system according to any one of claims 1 to 4, and the method includes: Temperature monitoring setup steps: A first temperature monitoring module is set at a set position on the non-metallic grille, and a second temperature monitoring module is set at a set position in the passenger compartment, which are used to obtain real-time air outlet temperature data of the air conditioning system and user ambient temperature data, respectively. The air conditioning operation control steps involve the air conditioning operation control module integrating the real-time air conditioning outlet temperature and the user's ambient temperature to adjust the operating parameters of the vehicle's air conditioning system so that the cooling effect inside the vehicle meets the set target comfort requirements. In the air conditioning operation control step, the air conditioning operation control module adjusts the operating parameters of the vehicle air conditioning system according to the following strategy: The difference between the user's ambient temperature and the preset target ambient temperature is calculated as a control index. Based on the comparison between the control index value and the set control level value, the operating parameters of the vehicle's air conditioning system are adjusted in combination with the constraint control conditions of the air conditioning outlet temperature.

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