Fresh air control method and device for air conditioning system

Abstract

The present application relates to air conditioner control technical field, particularly to fresh air control method and device of air conditioning system. Fresh air volume of rail vehicle is controlled, the air conditioning system can receive outbound signal and inbound signal from rail vehicle, if the outbound signal is received, the fresh air valve is opened to first opening degree; if the inbound signal is received, the fresh air valve is opened to second opening degree, the first opening degree is greater than the second opening degree.The present application has the advantages that: when entering the station, the positive pressure in the car can not be too large, the door opening is not affected, and the fresh air can ensure the air quality in the car, and bacteria and viruses will not spread to other cars due to return air.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner control, in particular to a fresh air control method and device for an air conditioning system. BACKGROUND

[0002] With the outbreak of the new crown epidemic, passengers have higher requirements for the quality of air in the rail vehicle. Therefore, in a specific scenario, the air conditioning system needs to be operated in a fresh air mode without return air to prevent bacteria, viruses, etc. from being transmitted to other carriages through the return air system.

[0003] However, the existing fresh air mode can cause the positive pressure in the carriage to be too large, affecting the opening of the door. SUMMARY

[0004] To solve the above problems, the present application provides a fresh air control method for an air conditioning system, and the technical solution is as follows:

[0005] A fresh air control method for an air conditioning system for controlling the fresh air volume of a rail vehicle, the air conditioning system being capable of receiving an outbound signal and an inbound signal from the rail vehicle, the air conditioning system comprising a fresh air valve; if the outbound signal is received, the fresh air valve is opened to a first opening degree;

[0006] If the inbound signal is received, the fresh air valve is opened to a second opening degree, and the first opening degree is greater than the second opening degree.

[0007] In this way, the positive pressure in the carriage can be ensured not to be too large when entering the station, and the opening of the door is not affected. The fresh air can ensure the air quality in the carriage, and bacteria and viruses will not be transmitted to other carriages due to return air.

[0008] In one of the embodiments, the air conditioning system comprises a high-temperature refrigeration mode and a transition season refrigeration mode, and the air conditioning system is capable of obtaining a first detection value and comparing it with a first set value;

[0009] If the first detection value is greater than or equal to the first set value, the high-temperature refrigeration mode is operated;

[0010] If the first detection value is less than the first set value, the transition season refrigeration mode is operated.

[0011] In this way, different modes are operated in different seasons to ensure comfort and energy saving.

[0012] In one of the embodiments, the operation method of the high-temperature refrigeration mode comprises:

[0013] If the current compressor operating frequency is greater than or equal to a first threshold value, the current air temperature in the carriage is obtained and compared with a first target temperature;

[0014] If the air temperature in the current car is greater than the target temperature, the fresh air quantity at an opening degree one step smaller than the current fresh air valve opening degree is determined according to the current fresh air valve opening degree, and if the fresh air quantity at the opening degree one step smaller than the current fresh air valve opening degree is greater than or equal to the current personnel required fresh air quantity, the fresh air valve is closed one step smaller, until the air temperature in the car is less than or equal to the second target temperature, which is less than the first target temperature.

[0015] In this way, when the compressor is running at full load and the air temperature in the car cannot meet the requirement, the fresh air quantity is reduced to reduce the supply air temperature based on the fresh air quantity meeting the current personnel required fresh air quantity, so that the air temperature in the car meets the requirement.

[0016] In one of the embodiments, the operation method of the high-temperature refrigeration mode further comprises:

[0017] The current supply air temperature is obtained and compared with the first preset temperature;

[0018] If the current supply air temperature is less than the first preset temperature, the compressor is unloaded until the supply air temperature is greater than the second preset temperature, which is greater than the first preset temperature.

[0019] In this way, the energy consumption can be reduced, and the temperature in the car meets the requirement, preventing the evaporator from frosting.

[0020] In one of the embodiments, the operation method of the high-temperature refrigeration mode further comprises:

[0021] The current supply air temperature is obtained and compared with the first preset temperature;

[0022] If the current supply air temperature is less than the first preset temperature, the compressor is unloaded until the supply air temperature is less than the third preset temperature, and the fresh air valve is opened, the first preset temperature being greater than the third preset temperature.

[0023] In this way, the supply air temperature is increased by increasing the fresh air quantity to prevent the evaporator from frosting, and if the supply air temperature is less than the third preset temperature, it indicates that the current supply air temperature is too small, and the fresh air valve needs to be opened to increase the supply air temperature.

[0024] In one of the embodiments, the operation method of the high-temperature refrigeration mode further comprises:

[0025] The fresh air valve is controlled to open to a first opening degree;

[0026] The current supply air temperature is obtained and compared with the first preset temperature;

[0027] If the current supply air temperature is less than the first preset temperature, the compressor is unloaded until the supply air temperature is greater than the second preset temperature, which is greater than the first preset temperature.

[0028] Thus, the energy consumption can be reduced, the air temperature in the vehicle cabin can meet the requirements, and the evaporator can be prevented from frosting due to too low temperature.

[0029] In one of the embodiments, the operation method of the transition season cooling mode comprises:

[0030] Controlling the fresh air valve to open to a first opening degree;

[0031] Obtaining the supply air temperature and comparing the supply air temperature with a first preset temperature;

[0032] If the supply air temperature is less than the first preset temperature, controlling the compressor to unload until the supply air temperature is less than a third preset temperature, and then shutting down the compressor, wherein the first preset temperature is greater than the third preset temperature.

[0033] Thus, the energy consumption can be reduced.

[0034] In one of the embodiments, if the supply air temperature is less than the first preset temperature, the method after the compressor is unloaded until the supply air temperature is less than the third preset temperature and then the compressor is shut down comprises:

[0035] Obtaining the fresh air temperature, determining a detection temperature difference according to the fresh air temperature and the supply air temperature, and comparing the detection temperature difference with a set temperature difference;

[0036] If the detection temperature difference is greater than the set temperature difference, continuing to shut down the compressor until the detection temperature difference is less than the set temperature difference.

[0037] Thus, since the fresh air temperature is low at this time, the cooling requirement can be met without starting the compressor, so that the energy consumption can be reduced.

[0038] In one of the embodiments, the air conditioning system further comprises a heating mode, and the operation method of the heating mode comprises:

[0039] Obtaining the current supply air temperature and comparing the current supply air temperature with a fourth preset temperature;

[0040] If the current supply air temperature is greater than the fourth preset temperature, controlling the compressor to unload;

[0041] If the current operating frequency of the compressor is less than or equal to a second threshold value, and the supply air temperature is greater than or equal to a preset third target temperature, opening the fresh air valve.

[0042] Thus, the appropriate supply air temperature can be adjusted, the compressor can be stably operated under low load, and the temperature in the vehicle cabin can be kept stable.

[0043] In one of the embodiments, the required minimum fresh air amount is determined according to the passenger occupancy rate, and if the current fresh air amount is less than the required minimum fresh air amount, the fresh air valve is opened.

[0044] In this way, the current fresh air volume meets the required minimum fresh air volume requirement.

[0045] The present application provides the following technical solutions:

[0046] A fresh air control device of an air conditioning system for fresh air volume control of a railway vehicle, the device comprising:

[0047] An acquisition module for acquiring an outbound signal and an inbound signal of the railway vehicle;

[0048] A control module for controlling the opening degree of the fresh air valve according to the received outbound signal and inbound signal.

[0049] Compared with the prior art, the present application sends the inbound signal to the air conditioning system when entering the station, controls the fresh air valve to be small, reduces the positive pressure in the carriage, facilitates the opening of the door, and after receiving the outbound signal, opens the fresh air valve to ensure the air quality in the carriage. The control scheme under different conditions can respectively avoid the problems of evaporator icing in the transition season and the temperature in the vehicle cannot be guaranteed due to excessive fresh air load in high temperature working condition, and provides protection for the actual operation of the full fresh air operation.

[0050] The details of one or more embodiments of the present application are presented in the following drawings and description, so that other features, objects and advantages of the present application are more apparent. BRIEF DESCRIPTION OF DRAWINGS

[0051] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0052] Figure 1 The control logic diagram of the fresh air valve when entering and leaving the station provided by the present application;

[0053] Figure 2 The control logic diagram for the cooling mode in the transition season;

[0054] Figure 3 The control logic diagram for the high-temperature cooling mode;

[0055] Figure 4 The control logic diagram for the heating mode;

[0056] Figure 5 The structure block diagram of the dehumidification control device of the air conditioning unit provided by the present application. DETAILED DESCRIPTION

[0057] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described and explained below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and should not be used to limit the present application. Based on the embodiments provided by the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application. In addition, it should be understood that although the efforts made in this development process can be complex and lengthy, some design, manufacture or production changes made on the basis of the technical content disclosed in the present application by those of ordinary skill in the art related to the disclosed content should only be considered as routine technical means and should not be understood as insufficient disclosure of the present application.

[0058] In the present application, the term "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.

[0059] Unless otherwise defined, the technical terms or scientific terms involved in the present application should be understood as the usual meaning by those of ordinary skill in the art to which the present application belongs. The terms "one", "a", "an", "the", and the like similar words involved in the present application do not represent quantity limitation, but can represent singular or plural. The terms "include", "contain", "have", and any variations thereof involved in the present application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device including a series of steps or modules (units) is not limited to the listed steps or units, but can also include steps or units not listed, or can also include other steps or units inherent to the process, method, product or device. The terms "connected", "connected", "coupled" and the like similar words involved in the present application are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The term "multiple" involved in the present application means greater than or equal to two. The term "and / or" describes the association between the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases: A alone, A and B together, and B alone. The terms "first", "second", "third" and the like involved in the present application are only to distinguish similar objects, and do not represent a specific order for the objects.

[0060] Please refer to Figure 1The application provides a novel air conditioning system fresh air control method, which is used for controlling the operation of a rail vehicle air conditioning system. The rail vehicle can be a traditional railway, a subway, a light rail or a tram, etc. The air conditioning system operates in a fresh air mode, that is, the return air valve of the air conditioning system is closed, so that the air in the vehicle cabin is all fresh air, thereby ensuring the air quality in the vehicle cabin and preventing bacteria, viruses, etc. from being transmitted to other vehicle cabins through the return air valve.

[0061] The air conditioning system comprises a fresh air valve and a main controller. The rail vehicle sends an inbound signal and an outbound signal to the air conditioning system. It should be explained that the inbound refers to the entry of the rail vehicle into a stopping platform, at this time, the vehicle slows down until stopping, the doors are opened for passengers to get on and off, and the outbound refers to the departure of the rail vehicle from the stopping platform.

[0062] Step S1, if the main controller receives the outbound signal, the fresh air valve is opened to a first opening degree;

[0063] Step S2, if the main controller receives the inbound signal, the fresh air valve is opened to a second opening degree, and the air conditioning system operates in a small fresh air mode.

[0064] The first opening degree is greater than the second opening degree. The first opening degree can be full opening or 80% opening, which can be adjusted according to the actual situation. The second opening degree can be 50%, 40%, 30% or the like, which can be adjusted according to the actual situation.

[0065] It can be understood that when the rail vehicle enters the stopping platform, the doors need to be opened for passengers to get on and off. If the fresh air volume is too large at this time, the positive pressure in the vehicle cabin will be too large, which will cause the doors to be difficult to open. Therefore, the fresh air valve is adjusted to a small opening degree when the rail vehicle enters the stopping platform, so as to reduce the positive pressure in the vehicle cabin. When the rail vehicle departs from the stopping platform, the doors have been closed, at this time, the fresh air volume is increased to ensure the air quality in the vehicle cabin.

[0066] The air conditioning system comprises a high-temperature refrigeration mode, a transition season refrigeration mode and a heating mode. The high-temperature refrigeration mode is operated in summer with high temperature, the transition season refrigeration mode is operated in spring and autumn, and the heating mode is operated in winter.

[0067] The air conditioning system comprises a first sensor. The first sensor is used for detecting air parameters such as outdoor air temperature and sending a first detection value to the main controller. The main controller is provided with a first set value.

[0068] The method for switching the operation mode of the air conditioning system comprises the following steps:

[0069] Step S3, comparing the first detection value with the first set value;

[0070] Step S4, if the first detection value is less than the first set value, the transition season refrigeration mode is operated.

[0071] Step S5, if the first detection value is greater than or equal to the first set value, running the high-temperature refrigeration mode.

[0072] It should be explained that the high-temperature refrigeration mode is a mode running when the outdoor temperature is greater than or equal to the first set value, and the transition season refrigeration mode is a mode running when the outdoor temperature is less than the first set value. In the embodiment, the first detection value is 28℃, and in other embodiments, the first detection value can be adjusted to 29℃, 30℃, etc. according to actual needs.

[0073] The air conditioning system comprises an evaporator and a second sensor, which is arranged at the air supply fan after the evaporator and used for detecting the air supply temperature.

[0074] Please refer to Figure 2 In step S4, the running method of the transition season refrigeration mode comprises:

[0075] Step S41, opening the fresh air valve to the first opening degree and keeping it at the first opening degree;

[0076] Step S401, controlling the compressor to enter the automatic running mode;

[0077] Step S42, obtaining the current air supply temperature and comparing it with the first preset temperature;

[0078] Step S43, if the air supply temperature is less than the first preset temperature, controlling the compressor to unload;

[0079] Step S44, obtaining the current air supply temperature and comparing it with the second preset temperature; if the current air supply temperature is greater than the second preset temperature, circulating steps S401-S43; if the air supply temperature is less than or equal to the second preset temperature, continuing to control the compressor to unload.

[0080] Wherein, the second preset temperature is greater than the first preset temperature.

[0081] In this way, in the spring and autumn transition season, not only can the refrigeration capacity be reduced by the compressor unloading when the refrigeration capacity is too large to save energy, but also can prevent the evaporator temperature from being too low to frost, and at the same time can meet the required refrigeration temperature. The first preset temperature can be 10℃, 12℃, etc., which can be adjusted according to actual conditions. In the embodiment, the second preset temperature is 15℃, and in other embodiments, the second preset temperature can be 16℃, 14℃, etc., which can be adjusted according to actual conditions.

[0082] Optionally, in step S43, the first preset time is set in the main control unit.

[0083] Step S431, if the air supply temperature is less than the first preset temperature and lasts for the first preset time, controlling the compressor to unload.

[0084] In this way, false judgment caused by short-term fluctuation is prevented. In this embodiment, the first preset time is 30 seconds, and in other embodiments, the first preset time can be 20 seconds, 1 minute, etc., which can be adjusted according to actual conditions.

[0085] The method for unloading the compressor is as follows: when the compressor is variable frequency, the frequency of the compressor is reduced to achieve unloading; when the compressor is fixed frequency, the compressor is started and stopped or hot gas bypass is used to achieve unloading.

[0086] The method after step S43 further includes:

[0087] In step S432, the current supply air temperature is obtained and compared with the third preset temperature.

[0088] In step S433, if the supply air temperature is less than the third preset temperature, the compressor is turned off.

[0089] In step S434, if the supply air temperature is greater than or equal to the third preset temperature, the compressor is continuously unloaded.

[0090] In step S433, after the compressor is turned off, the air conditioning system does not perform refrigeration, but only ventilation, which can prevent the evaporator from frosting and save energy. The third preset temperature is less than the first preset temperature, and in this embodiment, the third preset temperature is 5℃, and in other embodiments, the third preset temperature can also be 4℃, 6℃ or other temperatures, which can be adjusted according to actual conditions.

[0091] Optionally, in step S433, if the supply air temperature is less than the third preset temperature and the duration is greater than the first preset time, the compressor is turned off.

[0092] The method after step S433 further includes:

[0093] In step S4331, the fresh air temperature is obtained, the detection temperature difference is determined according to the fresh air temperature and the supply air temperature, and the detection temperature difference is compared with the set temperature difference; if the detection temperature difference is greater than the set temperature difference, the compressor is continuously turned off; if the detection temperature difference is less than the set temperature difference, the method returns to step S401.

[0094] In step S4331, the detection temperature difference = fresh air temperature - supply air temperature.

[0095] Optionally, in step S4331, if the detection temperature difference is greater than the set temperature difference and the duration is greater than the second preset time, the compressor is continuously turned off. In this way, false judgment caused by short-term fluctuation is prevented, and in this embodiment, the second preset time is 300 seconds, and in other embodiments, the second preset time can also be 200 seconds, etc., which can be adjusted according to actual conditions.

[0096] In the transition season refrigeration mode operation process, the opening degree of the fresh air valve is kept constant, but once the main controller receives the incoming signal, the fresh air valve is adjusted to the second opening degree.

[0097] Please refer to Figure 3 In step S5, the operation method of the high-temperature refrigeration mode includes:

[0098] Step S51, control the fresh air valve into automatic operation mode;

[0099] Step S52, when the operating frequency of the compressor is greater than or equal to the first threshold value;

[0100] Step S53, obtain the current air temperature in the car compartment and compare it with the first target temperature;

[0101] Step S54, if the current air temperature in the car compartment is greater than the first target temperature, determine the fresh air volume of the next gear smaller than the current fresh air valve opening degree according to the current fresh air volume of the fresh air valve, and compare it with the current fresh air volume required by the personnel;

[0102] Step S55, if the air temperature in the car compartment is less than or equal to the first target temperature, return to step S51.

[0103] It should be explained that the first threshold value refers to the operating frequency of the compressor. In this embodiment, the first threshold value refers to the maximum operating frequency of the compressor, that is, the compressor operates at full load, the first target temperature is equal to the set target temperature in the car plus 2℃, and the target temperature in the car can be set to 26℃, 24℃, etc. In other embodiments, the compressor can also operate at 90% or 80% of full load, and the first target temperature can also be equal to the target temperature in the car plus 1℃, 3℃, etc.

[0104] Optionally, in step S54, if the air temperature in the car compartment is greater than the first target temperature and lasts for a third preset time, the fresh air volume of the next gear smaller than the current fresh air valve opening degree is obtained and compared with the current fresh air volume required by the personnel, so as to avoid misjudgment caused by short-term fluctuations. The third preset time can be 30 seconds, 20 seconds, etc., which can be adjusted according to actual conditions.

[0105] Step S54 includes:

[0106] Step S541, if the fresh air volume of the next gear smaller than the current fresh air valve opening degree is greater than or equal to the current fresh air volume required by the personnel, control the fresh air valve to close one gear;

[0107] Step S542, if the fresh air volume of the next gear smaller than the current fresh air valve opening degree is less than the current fresh air volume required by the personnel, maintain the current opening degree.

[0108] In this way, when the compressor is in full load operation and the first target temperature cannot be reached, the fresh air volume is reduced, and in the case of constant refrigeration capacity, the supply air temperature is reduced, so that the air temperature in the vehicle cabin reaches the target value.

[0109] The method after step S541 further comprises:

[0110] Step S5421, compare the air temperature in the vehicle cabin with the second target temperature; if the air temperature in the vehicle cabin is greater than the second target temperature, return to step S54; if the air temperature in the vehicle cabin is less than the second target temperature, return to step S51.

[0111] In step S5421, the second target temperature is equal to the set vehicle target temperature plus 1°C, and in other embodiments, the second target temperature can also be equal to the set vehicle target temperature plus 1.5°C, 0°C, etc.

[0112] Optionally, after step S541, after a fourth preset time, step S5421 is entered again. The fourth preset time can be 300 seconds, 200 seconds, and after stable operation, the judgment is made again to avoid misjudgment.

[0113] The method after step S51 further comprises:

[0114] Step S56, obtain the current supply air temperature and compare it with the first preset temperature;

[0115] Step S57, if the current supply air temperature is less than the first preset temperature, control the compressor to unload;

[0116] Step S58, obtain the current supply air temperature and compare it with the second preset temperature; if the supply air temperature is greater than the second preset temperature, return to step S51; if the supply air temperature is less than or equal to the second preset temperature, continue to unload the compressor.

[0117] Optionally, in step S58, if the supply air temperature is greater than the second preset temperature and lasts for a first preset time, return to step S51.

[0118] The method after step S57 further comprises:

[0119] Step S571, obtain the current supply air temperature and compare it with the third preset temperature;

[0120] Step S572, if the current supply air temperature is less than the third preset temperature, open the fresh air valve and return to step S51;

[0121] Step S573, if the current supply air temperature is greater than or equal to the third preset temperature, continue to unload the compressor.

[0122] In step S572, if the supply air temperature is less than the third preset temperature, the fresh air valve is opened, so that the fresh air volume is not too small, and the supply air temperature is not too low, and the evaporator is not frosted. In the embodiment, the fresh air valve is opened by one step, so that the fresh air volume is not too large, and the supply air temperature is not too high, and the refrigeration demand cannot be met. Of course, in other embodiments, according to actual needs, the fresh air valve can be opened by two steps or the like.

[0123] Step S5 further includes:

[0124] In step S59, the minimum fresh air volume required is determined according to the passenger rate, and if the current fresh air volume is less than the minimum fresh air volume, the fresh air valve is opened.

[0125] Step S59 is prior to steps S51-S58, that is, when steps S51-S58 are executed, if it is detected that the fresh air volume in the vehicle cabin cannot meet the minimum fresh air volume required, the fresh air valve is opened.

[0126] When the high-temperature refrigeration mode is running, if the main controller receives an entry signal, the fresh air valve is adjusted to the second opening degree, and the entry signal is prior to other signals of the high-temperature refrigeration mode.

[0127] Please refer to Figure 4 The operation method of the heating mode S6 includes:

[0128] In step S61, the fresh air valve is controlled to enter an automatic operation mode;

[0129] In step S62, the current supply air temperature is obtained and compared with a fourth preset temperature;

[0130] In step S63, if the current supply air temperature is greater than the fourth preset temperature, the compressor is unloaded.

[0131] In step S64, if the current supply air temperature is less than or equal to the fourth preset temperature, the process returns to step S61.

[0132] In step S63, if the current supply air temperature is greater than the fourth preset temperature, the method after the compressor is unloaded further includes:

[0133] In step S631, it is determined whether the current operating frequency of the compressor is less than or equal to a second threshold value, and whether the supply air temperature is greater than a preset third target temperature;

[0134] In step S632, if yes, the fresh air valve is opened, and after running for a sixth preset time, the process returns to step S61; the appropriate supply air temperature can be adjusted, the compressor can be stably operated under low load, and the temperature in the vehicle can be kept stable;

[0135] In step S633, if no, the compressor is unloaded, and the process returns to step S61.

[0136] The second threshold is the operating frequency of the compressor. In the embodiment, it is determined in step S631 whether the compressor is operating at the lowest load. In other embodiments, the second threshold can also be 10% or 20% of the highest frequency as the second threshold. The third target temperature is set in advance according to the desired value of passenger comfort and can be adjusted.

[0137] Optionally, in step S62, if the current supply air temperature is greater than the fourth preset temperature and lasts for a fifth preset time, the compressor is unloaded to avoid misoperation caused by short-term fluctuations.

[0138] In step S632, the fresh air valve is opened to adjust the supply air temperature. After the fresh air valve is opened and lasts for a sixth preset time, it returns to step S61 to avoid frequent adjustment of the fresh air valve. In the embodiment, the sixth preset time is 300 seconds. In other embodiments, the sixth preset time can also be 250 seconds, which can be adjusted according to actual conditions.

[0139] In the heating mode, the fresh air valve is also adjusted according to the required minimum fresh air volume, and is prior to steps S61-S64, that is, when steps S61-S64 are executed, if it is detected that the current fresh air volume in the car cannot meet the required minimum fresh air volume, the fresh air valve is opened. And if the host controller receives an incoming signal, the fresh air valve is adjusted to the second opening degree. The incoming signal is prior to other signals in the heating mode.

[0140] In the present application, the return air valve is closed. Before step S1, the fresh air volume is adjusted according to the opening degree of the fresh air valve. By measuring the fresh air volume at different opening degrees, a fresh air volume control model is established and input into the controller. According to the current required fresh air volume, the corresponding opening degree is found in the controller, so as to control the opening degree of the fresh air valve.

[0141] Please refer to Figure 5 The present application also provides a fresh air control device of an air conditioning system, which is used for fresh air volume control of a railway vehicle. The device comprises:

[0142] The acquisition module 10 is used for acquiring the outbound signal and the incoming signal of the railway vehicle.

[0143] The control module 20 is used for controlling the opening degree of the fresh air valve according to the received outbound signal and incoming signal.

[0144] In other embodiments, the acquisition module 10 can also be used for acquiring the first detection value of the air conditioning system, the air temperature in the current car, the current supply air temperature and the fresh air temperature.

[0145] In other embodiments, the control module 20 can also be used for controlling the frequency of the compressor and the start and stop of the compressor.

[0146] The air conditioning system new air control method provided by the application sends a station-in signal to the air conditioning system when entering a station, controls the new air valve to be small, and opens the new air valve to the second opening degree to reduce the positive pressure in the car compartment and facilitate the opening of the car door as long as the station-in signal is received, no matter whether the air conditioning system is in a transition season cooling mode, a high-temperature cooling mode or a heating mode, and opens the new air valve to the first opening degree to ensure the air quality in the car compartment when a station-out signal is received.

[0147] It should be noted that the specific examples in the embodiments can refer to the examples described in the above embodiments and optional implementation manners, and the embodiments will not be described here.

[0148] Those skilled in the art should understand that the technical features of the above embodiments can be combined arbitrarily, and in order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0149] The above embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the application should be subject to the appended claims.

Claims

1. A fresh air control method of an air conditioning system for controlling the amount of fresh air of a railway vehicle, the air conditioning system being capable of receiving an outbound signal and an inbound signal from the railway vehicle, the method comprising: opening a fresh air valve to a first opening degree if the outbound signal is received; opening the fresh air valve to a second opening degree if the inbound signal is received, the first opening degree being greater than the second opening degree; the air conditioning system comprising a high-temperature refrigeration mode and a transition season refrigeration mode; obtaining a first detection value of the air conditioning system and comparing the first detection value with a first set value; running the high-temperature refrigeration mode if the first detection value is greater than or equal to the first set value; running the transition season refrigeration mode if the first detection value is less than the first set value; the method of running the transition season refrigeration mode comprising: controlling the fresh air valve to open to the first opening degree and keeping the fresh air valve at the first opening degree; obtaining a current supply air temperature and comparing the supply air temperature with a first preset temperature; controlling the compressor to unload if the supply air temperature is less than the first preset temperature and the condition lasts for a first preset time, until the supply air temperature is greater than a second preset temperature, the second preset temperature being greater than the first preset temperature; the method of running the high-temperature refrigeration mode comprising: obtaining a current air temperature in a vehicle compartment if a current operating frequency of the compressor is greater than or equal to a first threshold value and comparing the current air temperature in the vehicle compartment with a first target temperature; determining an air quantity at an opening degree one step smaller than a current opening degree of the fresh air valve according to an air quantity at the current opening degree of the fresh air valve if the current air temperature in the vehicle compartment is greater than the first target temperature and the condition lasts for a third preset time, and controlling the fresh air valve to close one step if the air quantity at the opening degree one step smaller than the current opening degree of the fresh air valve is greater than or equal to a fresh air quantity required by current passengers, until the air temperature in the vehicle compartment is less than or equal to a second target temperature, the second target temperature being less than the first target temperature. The method of running the high-temperature refrigeration mode further comprises: obtaining a current supply air temperature and comparing the supply air temperature with a first preset temperature; controlling the compressor to unload if the current supply air temperature is less than the first preset temperature, until the supply air temperature is greater than a second preset temperature, the second preset temperature being greater than the first preset temperature. The method of running the high-temperature refrigeration mode further comprises: obtaining a current supply air temperature and comparing the supply air temperature with a first preset temperature; controlling the compressor to unload if the supply air temperature is less than the first preset temperature, until the supply air temperature is less than a third preset temperature, opening the fresh air valve, the first preset temperature being greater than the third preset temperature. The method of running the transition season refrigeration mode comprises: controlling the fresh air valve to open to the first opening degree; obtaining a current supply air temperature and comparing the supply air temperature with a first preset temperature; controlling the compressor to unload if the supply air temperature is less than the first preset temperature, until the supply air temperature is less than a third preset temperature, closing the compressor, the first preset temperature being greater than the third preset temperature. The method after the compressor is closed if the supply air temperature is less than the first preset temperature, until the supply air temperature is less than the third preset temperature, comprises: obtaining a fresh air temperature, determining a detection temperature difference according to the fresh air temperature and the supply air temperature, and comparing the detection temperature difference with a set temperature difference; ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The all fresh air control method of an air conditioning system according to claim 1, wherein, ​ ​ ​ 3. The all fresh air control method of an air conditioning system of claim 1, wherein, ​ ​ ​ 4. The all fresh air control method of an air conditioning system of claim 1, wherein, ​ ​ ​ ​ 5. The all fresh air control method of an air conditioning system according to claim 4, wherein, ​ ​ If the detected temperature difference is greater than the set temperature difference, the compressor continues to be turned off until the detected temperature difference is less than the set temperature difference.

6. The all fresh air control method of an air conditioning system of claim 1, wherein, The air conditioning system also comprises a heating mode, and a running method of the heating mode comprises: obtaining a current supply air temperature and comparing the current supply air temperature with a fourth preset temperature; if the supply air temperature is greater than the fourth preset temperature, controlling the compressor to unload; if a current running frequency of the compressor is less than or equal to a second threshold value, and the supply air temperature is greater than or equal to a third target temperature, opening the fresh air valve.

7. The all fresh air control method of an air conditioning system of claim 1, wherein, determining a required minimum fresh air volume according to a passenger rate, and if a current fresh air volume is less than the required minimum fresh air volume, opening the fresh air valve.

8. A fresh air control device for an air conditioning system for fresh air volume control of a railway vehicle, characterized by, The device comprises: an acquisition module, configured to acquire an outbound signal and an inbound signal of the rail vehicle; a control module, configured to control an opening degree of the fresh air valve according to the received outbound signal and inbound signal.

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